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      4 <div id="fuzz487a">
      5   RunTestSet [fuzz487a]
      6 
      7 {{172.5,96}, {137.600006,96}},
      8 {{137.600006,96}, {137.600006,77.1999969}, {124.800003,61.4000015}, {107.500008,56.7999992}},
      9 {{107.500008,56.7999992}, {116.500008,23.0999985}},
     10 {{116.500008,23.0999985}, {110.200005,21.3999977}, {103.600006,20.4999981}, {97.0000076,20.4999981}},
     11 {{97.0000076,20.4999981}, {97.0000076,55.4000015}},
     12 {{97.0000076,55.4000015}, {97.0000076,55.4000015}},
     13 {{97.0000076,55.4000015}, {78.2000122,55.4000015}, {62.4000092,68.2000046}, {57.8000069,85.5}},
     14 {{57.8000069,85.5}, {24.1000061,76.5}},
     15 {{24.1000061,76.5}, {22.4000053,82.8000031}, {21.5000057,89.4000015}, {21.5000057,96}},
     16 {{21.5000057,96}, {56.4000092,96}},
     17 {{56.4000092,96}, {56.4000092,96}},
     18 {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}},
     19 {{228.900009,192}, {172.5,96}},
     20 op union
     21 {{172.5,96}, {137.600006,96}},
     22 {{137.600006,96}, {137.600006,81}, {129.400009,67.9000015}, {117.300003,60.9000015}},
     23 {{117.300003,60.9000015}, {134.800003,30.7000008}},
     24 {{134.800003,30.7000008}, {123.700005,24.3000011}, {110.800003,20.6000004}, {97.1000061,20.6000004}},
     25 {{97.1000061,20.6000004}, {97.1000061,55.5}},
     26 {{97.1000061,55.5}, {82.1000061,55.5}, {69.0000076,63.7000008}, {62.0000076,75.8000031}},
     27 {{62.0000076,75.8000031}, {31.6000004,58.2999992}},
     28 {{31.6000004,58.2999992}, {25.2000008,69.4000015}, {21.5,82.3000031}, {21.5,96}},
     29 {{21.5,96}, {56.4000015,96}},
     30 {{56.4000015,96}, {56.4000015,111}, {64.5999985,124.099998}, {76.6999969,131.100006}},
     31 {{76.6999969,131.100006}, {60.6999969,131.100006}, {47.2999954,141.900009}, {43.3999977,156.700012}},
     32 {{43.3999977,156.700012}, {3.33333338e+029,119.400002}},
     33 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}},
     34 {{29.3999996,-10.8000002}, {33.2999992,-25.6000004}},
     35 {{33.2999992,-25.6000004}, {62,-17.9000015}},
     36 {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}},
     37 {{161.199997,136}, {172.5,96}},
     38 debugShowCubicIntersection no self intersect {{137.600006,96}, {137.600006,81}, {129.400009,67.9000015}, {117.300003,60.9000015}}
     39 debugShowCubicIntersection no self intersect {{134.800003,30.7000008}, {123.700005,24.3000011}, {110.800003,20.6000004}, {97.1000061,20.6000004}}
     40 debugShowCubicIntersection no self intersect {{97.1000061,55.5}, {82.1000061,55.5}, {69.0000076,63.7000008}, {62.0000076,75.8000031}}
     41 debugShowCubicIntersection no self intersect {{31.6000004,58.2999992}, {25.2000008,69.4000015}, {21.5,82.3000031}, {21.5,96}}
     42 debugShowCubicIntersection no self intersect {{56.4000015,96}, {56.4000015,111}, {64.5999985,124.099998}, {76.6999969,131.100006}}
     43 debugShowCubicIntersection no self intersect {{76.6999969,131.100006}, {60.6999969,131.100006}, {47.2999954,141.900009}, {43.3999977,156.700012}}
     44 debugShowCubicIntersection no self intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}}
     45 debugShowCubicLineIntersection wtTs[0]=0 {{137.600006,96}, {137.600006,81}, {129.400009,67.9000015}, {117.300003,60.9000015}} {{137.600006,96}} wnTs[0]=1 {{172.5,96}, {137.600006,96}}
     46 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{137.600006,96}} wnTs[0]=1 {{172.5,96}, {137.600006,96}}
     47 debugShowCubicLineIntersection no intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{172.5,96}, {137.600006,96}}
     48 debugShowLineIntersection wtTs[0]=1 {{161.199997,136}, {172.5,96}} {{172.5,96}} wnTs[0]=0 {{172.5,96}, {137.600006,96}}
     49 debugShowCubicLineIntersection wtTs[0]=1 {{137.600006,96}, {137.600006,81}, {129.400009,67.9000015}, {117.300003,60.9000015}} {{117.300003,60.9000015}} wnTs[0]=0 {{117.300003,60.9000015}, {134.800003,30.7000008}}
     50 debugShowCubicLineIntersection wtTs[0]=0 {{137.600006,96}, {137.600006,81}, {129.400009,67.9000015}, {117.300003,60.9000015}} {{137.600006,96}} wtTs[1]=1 {{117.300003,60.9000015}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} wnTs[1]=1
     51 debugShowCubicIntersection no intersect {{137.600006,96}, {137.600006,81}, {129.400009,67.9000015}, {117.300003,60.9000015}} {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}}
     52 debugShowCubicLineIntersection wtTs[0]=0 {{134.800003,30.7000008}, {123.700005,24.3000011}, {110.800003,20.6000004}, {97.1000061,20.6000004}} {{134.800003,30.7000008}} wnTs[0]=1 {{117.300003,60.9000015}, {134.800003,30.7000008}}
     53 debugShowLineIntersection wtTs[0]=0 {{117.300003,60.9000015}, {134.800003,30.7000008}} {{117.300003,60.9000015}} wtTs[1]=1 {{134.800003,30.7000008}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} wnTs[1]=1
     54 debugShowCubicLineIntersection no intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{117.300003,60.9000015}, {134.800003,30.7000008}}
     55 debugShowCubicLineIntersection wtTs[0]=1 {{134.800003,30.7000008}, {123.700005,24.3000011}, {110.800003,20.6000004}, {97.1000061,20.6000004}} {{97.1000061,20.6000004}} wnTs[0]=0 {{97.1000061,20.6000004}, {97.1000061,55.5}}
     56 debugShowCubicLineIntersection wtTs[0]=0 {{134.800003,30.7000008}, {123.700005,24.3000011}, {110.800003,20.6000004}, {97.1000061,20.6000004}} {{134.800003,30.7000008}} wtTs[1]=1 {{97.1000061,20.6000004}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} wnTs[1]=1
     57 debugShowCubicIntersection no intersect {{134.800003,30.7000008}, {123.700005,24.3000011}, {110.800003,20.6000004}, {97.1000061,20.6000004}} {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}}
     58 debugShowCubicLineIntersection wtTs[0]=0 {{97.1000061,55.5}, {82.1000061,55.5}, {69.0000076,63.7000008}, {62.0000076,75.8000031}} {{97.1000061,55.5}} wnTs[0]=1 {{97.1000061,20.6000004}, {97.1000061,55.5}}
     59 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{97.1000061,20.6000004}} wnTs[0]=0 {{97.1000061,20.6000004}, {97.1000061,55.5}}
     60 debugShowCubicLineIntersection wtTs[0]=0.13656589 {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{97.1000061,40.6604424}} wnTs[0]=0.574798 {{97.1000061,20.6000004}, {97.1000061,55.5}}
     61 debugShowCubicLineIntersection wtTs[0]=1 {{97.1000061,55.5}, {82.1000061,55.5}, {69.0000076,63.7000008}, {62.0000076,75.8000031}} {{62.0000076,75.8000031}} wnTs[0]=0 {{62.0000076,75.8000031}, {31.6000004,58.2999992}}
     62 debugShowCubicLineIntersection wtTs[0]=0 {{97.1000061,55.5}, {82.1000061,55.5}, {69.0000076,63.7000008}, {62.0000076,75.8000031}} {{97.1000061,55.5}} wtTs[1]=1 {{62.0000076,75.8000031}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} wnTs[1]=1
     63 debugShowCubicIntersection no intersect {{97.1000061,55.5}, {82.1000061,55.5}, {69.0000076,63.7000008}, {62.0000076,75.8000031}} {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}}
     64 debugShowCubicLineIntersection wtTs[0]=0 {{31.6000004,58.2999992}, {25.2000008,69.4000015}, {21.5,82.3000031}, {21.5,96}} {{31.6000004,58.2999992}} wnTs[0]=1 {{62.0000076,75.8000031}, {31.6000004,58.2999992}}
     65 debugShowLineIntersection wtTs[0]=0 {{62.0000076,75.8000031}, {31.6000004,58.2999992}} {{62.0000076,75.8000031}} wtTs[1]=1 {{31.6000004,58.2999992}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} wnTs[1]=1
     66 debugShowCubicLineIntersection no intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{62.0000076,75.8000031}, {31.6000004,58.2999992}}
     67 debugShowCubicLineIntersection wtTs[0]=1 {{31.6000004,58.2999992}, {25.2000008,69.4000015}, {21.5,82.3000031}, {21.5,96}} {{21.5,96}} wnTs[0]=0 {{21.5,96}, {56.4000015,96}}
     68 debugShowCubicLineIntersection wtTs[0]=0 {{31.6000004,58.2999992}, {25.2000008,69.4000015}, {21.5,82.3000031}, {21.5,96}} {{31.6000004,58.2999992}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}}
     69 debugShowCubicLineIntersection wtTs[0]=0 {{56.4000015,96}, {56.4000015,111}, {64.5999985,124.099998}, {76.6999969,131.100006}} {{56.4000015,96}} wnTs[0]=1 {{21.5,96}, {56.4000015,96}}
     70 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{56.4000015,96}} wnTs[0]=1 {{21.5,96}, {56.4000015,96}}
     71 debugShowCubicIntersection wtTs[0]=1 {{56.4000015,96}, {56.4000015,111}, {64.5999985,124.099998}, {76.6999969,131.100006}} {{76.6999969,131.100006}} wnTs[0]=0 {{76.6999969,131.100006}, {60.6999969,131.100006}, {47.2999954,141.900009}, {43.3999977,156.700012}}
     72 debugShowCubicLineIntersection wtTs[0]=1 {{56.4000015,96}, {56.4000015,111}, {64.5999985,124.099998}, {76.6999969,131.100006}} {{76.6999969,131.100006}} wnTs[0]=0 {{43.3999977,156.700012}, {3.33333338e+029,119.400002}}
     73 debugShowCubicLineIntersection wtTs[0]=0 {{56.4000015,96}, {56.4000015,111}, {64.5999985,124.099998}, {76.6999969,131.100006}} {{56.4000015,96}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}}
     74 debugShowCubicIntersection no intersect {{56.4000015,96}, {56.4000015,111}, {64.5999985,124.099998}, {76.6999969,131.100006}} {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}}
     75 debugShowCubicLineIntersection wtTs[0]=0 {{76.6999969,131.100006}, {60.6999969,131.100006}, {47.2999954,141.900009}, {43.3999977,156.700012}} {{76.6999969,131.100006}} wtTs[1]=1 {{43.3999977,156.700012}} wnTs[0]=0 {{43.3999977,156.700012}, {3.33333338e+029,119.400002}} wnTs[1]=0
     76 debugShowCubicIntersection no intersect {{76.6999969,131.100006}, {60.6999969,131.100006}, {47.2999954,141.900009}, {43.3999977,156.700012}} {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}}
     77 debugShowLineIntersection wtTs[0]=1 {{43.3999977,156.700012}, {3.33333338e+029,119.400002}} {{3.33333338e+029,119.400002}} wnTs[0]=0 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}}
     78 debugShowCubicLineIntersection wtTs[0]=1 {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{161.199997,136}} wnTs[0]=0 {{43.3999977,156.700012}, {3.33333338e+029,119.400002}}
     79 debugShowLineIntersection wtTs[0]=0 {{43.3999977,156.700012}, {3.33333338e+029,119.400002}} {{161.199997,136}} wnTs[0]=0 {{161.199997,136}, {172.5,96}}
     80 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{29.3999996,-10.8000002}} wnTs[0]=0 {{29.3999996,-10.8000002}, {33.2999992,-25.6000004}}
     81 debugShowCubicLineIntersection no intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}}
     82 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{172.5,96}} wnTs[0]=1 {{161.199997,136}, {172.5,96}}
     83 debugShowLineIntersection wtTs[0]=1 {{29.3999996,-10.8000002}, {33.2999992,-25.6000004}} {{33.2999992,-25.6000004}} wnTs[0]=0 {{33.2999992,-25.6000004}, {62,-17.9000015}}
     84 debugShowCubicLineIntersection wtTs[0]=0 {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{62,-17.9000015}} wnTs[0]=1 {{33.2999992,-25.6000004}, {62,-17.9000015}}
     85 debugShowCubicLineIntersection wtTs[0]=1 {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{161.199997,136}} wnTs[0]=0 {{161.199997,136}, {172.5,96}}
     86 debugShowLineIntersection wtTs[0]=0 {{172.5,96}, {137.600006,96}} {{172.5,96}} wtTs[1]=1 {{137.600006,96}} wnTs[0]=0 {{172.5,96}, {137.600006,96}} wnTs[1]=1
     87 debugShowCubicLineIntersection wtTs[0]=0 {{137.600006,96}, {137.600006,77.1999969}, {124.800003,61.4000015}, {107.500008,56.7999992}} {{137.600006,96}} wnTs[0]=1 {{172.5,96}, {137.600006,96}}
     88 debugShowCubicLineIntersection no intersect {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}} {{172.5,96}, {137.600006,96}}
     89 debugShowLineIntersection wtTs[0]=1 {{228.900009,192}, {172.5,96}} {{172.5,96}} wnTs[0]=0 {{172.5,96}, {137.600006,96}}
     90 debugShowCubicLineIntersection wtTs[0]=0 {{137.600006,96}, {137.600006,81}, {129.400009,67.9000015}, {117.300003,60.9000015}} {{137.600006,96}} wnTs[0]=1 {{172.5,96}, {137.600006,96}}
     91 debugShowCubicIntersection wtTs[0]=0 {{137.600006,96}, {137.600006,81}, {129.400009,67.9000015}, {117.300003,60.9000015}} {{137.600006,96}} wnTs[0]=0 {{137.600006,96}, {137.600006,77.1999969}, {124.800003,61.4000015}, {107.500008,56.7999992}}
     92 debugShowCubicIntersection no intersect {{137.600006,96}, {137.600006,81}, {129.400009,67.9000015}, {117.300003,60.9000015}} {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}}
     93 debugShowCubicLineIntersection wtTs[0]=0.798977321 {{137.600006,96}, {137.600006,77.1999969}, {124.800003,61.4000015}, {107.500008,56.7999992}} {{117.320122,60.8652802}} wnTs[0]=0.00114967 {{117.300003,60.9000015}, {134.800003,30.7000008}}
     94 debugShowCubicLineIntersection wtTs[0]=0.511418257 {{134.800003,30.7000008}, {123.700005,24.3000011}, {110.800003,20.6000004}, {97.1000061,20.6000004}} {{116.491173,23.1330757}} wnTs[0]=0.999019 {{107.500008,56.7999992}, {116.500008,23.0999985}}
     95 debugShowCubicIntersection no intersect {{134.800003,30.7000008}, {123.700005,24.3000011}, {110.800003,20.6000004}, {97.1000061,20.6000004}} {{116.500008,23.0999985}, {110.200005,21.3999977}, {103.600006,20.4999981}, {97.0000076,20.4999981}}
     96 debugShowCubicLineIntersection no intersect {{116.500008,23.0999985}, {110.200005,21.3999977}, {103.600006,20.4999981}, {97.0000076,20.4999981}} {{97.1000061,20.6000004}, {97.1000061,55.5}}
     97 debugShowCubicIntersection no intersect {{97.1000061,55.5}, {82.1000061,55.5}, {69.0000076,63.7000008}, {62.0000076,75.8000031}} {{97.0000076,55.4000015}, {78.2000122,55.4000015}, {62.4000092,68.2000046}, {57.8000069,85.5}}
     98 debugShowCubicLineIntersection wtTs[0]=0.799679553 {{97.0000076,55.4000015}, {78.2000122,55.4000015}, {62.4000092,68.2000046}, {57.8000069,85.5}} {{61.8468246,75.7118225}} wnTs[0]=0.00503891 {{62.0000076,75.8000031}, {31.6000004,58.2999992}}
     99 debugShowCubicLineIntersection no intersect {{31.6000004,58.2999992}, {25.2000008,69.4000015}, {21.5,82.3000031}, {21.5,96}} {{57.8000069,85.5}, {24.1000061,76.5}}
    100 debugShowCubicIntersection wtTs[0]=1 {{31.6000004,58.2999992}, {25.2000008,69.4000015}, {21.5,82.3000031}, {21.5,96}} {{21.5,96}} wnTs[0]=1 {{24.1000061,76.5}, {22.4000053,82.8000031}, {21.5000057,89.4000015}, {21.5000057,96}}
    101 debugShowCubicLineIntersection no intersect {{31.6000004,58.2999992}, {25.2000008,69.4000015}, {21.5,82.3000031}, {21.5,96}} {{21.5000057,96}, {56.4000092,96}}
    102 debugShowCubicLineIntersection wtTs[0]=1 {{24.1000061,76.5}, {22.4000053,82.8000031}, {21.5000057,89.4000015}, {21.5000057,96}} {{21.5000057,96}} wnTs[0]=1.63955e-007 {{21.5,96}, {56.4000015,96}}
    103 debugShowLineIntersection wtTs[0]=0 {{21.5000057,96}, {56.4000092,96}} {{21.5000057,96}} wtTs[1]=0.999999781 {{56.4000015,96}} wnTs[0]=1.63955e-007 {{21.5,96}, {56.4000015,96}} wnTs[1]=1
    104 debugShowCubicLineIntersection no intersect {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}} {{21.5,96}, {56.4000015,96}}
    105 debugShowCubicLineIntersection wtTs[0]=0 {{56.4000015,96}, {56.4000015,111}, {64.5999985,124.099998}, {76.6999969,131.100006}} {{56.4000015,96}} wnTs[0]=1 {{21.5000057,96}, {56.4000092,96}}
    106 debugShowCubicIntersection wtTs[0]=0 {{56.4000015,96}, {56.4000015,111}, {64.5999985,124.099998}, {76.6999969,131.100006}} {{56.4000015,96}} wnTs[0]=0 {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}}
    107 debugShowCubicIntersection wtTs[0]=0.267722282 {{76.6999969,131.100006}, {60.6999969,131.100006}, {47.2999954,141.900009}, {43.3999977,156.700012}} {{64.540802,133.291794}} wnTs[0]=0.131302 {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}}
    108 debugShowCubicLineIntersection no intersect {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}} {{43.3999977,156.700012}, {3.33333338e+029,119.400002}}
    109 debugShowLineIntersection wtTs[0]=4.94283788e-028 {{43.3999977,156.700012}, {3.33333338e+029,119.400002}} {{208.16127,156.700012}} wnTs[0]=0.367708 {{228.900009,192}, {172.5,96}}
    110 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{137.600006,96}} wnTs[0]=1 {{172.5,96}, {137.600006,96}}
    111 debugShowCubicLineIntersection wtTs[0]=0 {{137.600006,96}, {137.600006,77.1999969}, {124.800003,61.4000015}, {107.500008,56.7999992}} {{137.600006,96}} wtTs[1]=1 {{107.500008,56.7999992}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} wnTs[1]=1
    112 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{107.500008,56.7999992}} wnTs[0]=0 {{107.500008,56.7999992}, {116.500008,23.0999985}}
    113 debugShowCubicLineIntersection wtTs[0]=0 {{116.500008,23.0999985}, {110.200005,21.3999977}, {103.600006,20.4999981}, {97.0000076,20.4999981}} {{116.500008,23.0999985}} wtTs[1]=1 {{97.0000076,20.4999981}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} wnTs[1]=1
    114 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{97.0000076,20.4999981}} wnTs[0]=0 {{97.0000076,20.4999981}, {97.0000076,55.4000015}}
    115 debugShowCubicLineIntersection wtTs[0]=0 {{97.0000076,55.4000015}, {78.2000122,55.4000015}, {62.4000092,68.2000046}, {57.8000069,85.5}} {{97.0000076,55.4000015}} wtTs[1]=1 {{57.8000069,85.5}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} wnTs[1]=1
    116 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{57.8000069,85.5}} wnTs[0]=0 {{57.8000069,85.5}, {24.1000061,76.5}}
    117 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{56.4000092,96}} wnTs[0]=1 {{21.5000057,96}, {56.4000092,96}}
    118 debugShowCubicLineIntersection wtTs[0]=0 {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}} {{56.4000092,96}} wnTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}}
    119 debugShowLineIntersection wtTs[0]=1 {{3.33333338e+029,119.400002}, {29.3999996,-10.8000002}} {{172.5,96}} wnTs[0]=1 {{228.900009,192}, {172.5,96}}
    120 debugShowCubicLineIntersection no intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{172.5,96}, {137.600006,96}}
    121 debugShowCubicIntersection no intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{137.600006,96}, {137.600006,77.1999969}, {124.800003,61.4000015}, {107.500008,56.7999992}}
    122 debugShowCubicLineIntersection no intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{107.500008,56.7999992}, {116.500008,23.0999985}}
    123 debugShowCubicIntersection no intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{116.500008,23.0999985}, {110.200005,21.3999977}, {103.600006,20.4999981}, {97.0000076,20.4999981}}
    124 debugShowCubicLineIntersection wtTs[0]=0.136112912 {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{97.0000076,40.4949226}} wnTs[0]=0.57292 {{97.0000076,20.4999981}, {97.0000076,55.4000015}}
    125 debugShowCubicIntersection no intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{97.0000076,55.4000015}, {78.2000122,55.4000015}, {62.4000092,68.2000046}, {57.8000069,85.5}}
    126 debugShowCubicIntersection no intersect {{62,-17.9000015}, {160.399994,147.300003}, {161.199997,141.699997}, {161.199997,136}} {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}}
    127 debugShowLineIntersection wtTs[0]=1 {{161.199997,136}, {172.5,96}} {{172.5,96}} wnTs[0]=0 {{172.5,96}, {137.600006,96}}
    128 debugShowCubicLineIntersection no intersect {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}} {{161.199997,136}, {172.5,96}}
    129 debugShowLineIntersection wtTs[0]=1 {{161.199997,136}, {172.5,96}} {{172.5,96}} wnTs[0]=1 {{228.900009,192}, {172.5,96}}
    130 debugShowCubicIntersection no self intersect {{137.600006,96}, {137.600006,77.1999969}, {124.800003,61.4000015}, {107.500008,56.7999992}}
    131 debugShowCubicIntersection no self intersect {{116.500008,23.0999985}, {110.200005,21.3999977}, {103.600006,20.4999981}, {97.0000076,20.4999981}}
    132 debugShowCubicIntersection no self intersect {{97.0000076,55.4000015}, {78.2000122,55.4000015}, {62.4000092,68.2000046}, {57.8000069,85.5}}
    133 debugShowCubicIntersection no self intersect {{24.1000061,76.5}, {22.4000053,82.8000031}, {21.5000057,89.4000015}, {21.5000057,96}}
    134 debugShowCubicIntersection no self intersect {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}}
    135 debugShowCubicLineIntersection wtTs[0]=0 {{137.600006,96}, {137.600006,77.1999969}, {124.800003,61.4000015}, {107.500008,56.7999992}} {{137.600006,96}} wnTs[0]=1 {{172.5,96}, {137.600006,96}}
    136 debugShowCubicLineIntersection no intersect {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}} {{172.5,96}, {137.600006,96}}
    137 debugShowLineIntersection wtTs[0]=1 {{228.900009,192}, {172.5,96}} {{172.5,96}} wnTs[0]=0 {{172.5,96}, {137.600006,96}}
    138 debugShowCubicLineIntersection wtTs[0]=1 {{137.600006,96}, {137.600006,77.1999969}, {124.800003,61.4000015}, {107.500008,56.7999992}} {{107.500008,56.7999992}} wnTs[0]=0 {{107.500008,56.7999992}, {116.500008,23.0999985}}
    139 debugShowCubicIntersection no intersect {{137.600006,96}, {137.600006,77.1999969}, {124.800003,61.4000015}, {107.500008,56.7999992}} {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}}
    140 debugShowCubicLineIntersection wtTs[0]=0 {{116.500008,23.0999985}, {110.200005,21.3999977}, {103.600006,20.4999981}, {97.0000076,20.4999981}} {{116.500008,23.0999985}} wnTs[0]=1 {{107.500008,56.7999992}, {116.500008,23.0999985}}
    141 debugShowCubicLineIntersection wtTs[0]=1 {{116.500008,23.0999985}, {110.200005,21.3999977}, {103.600006,20.4999981}, {97.0000076,20.4999981}} {{97.0000076,20.4999981}} wnTs[0]=0 {{97.0000076,20.4999981}, {97.0000076,55.4000015}}
    142 debugShowCubicLineIntersection wtTs[0]=0 {{97.0000076,55.4000015}, {78.2000122,55.4000015}, {62.4000092,68.2000046}, {57.8000069,85.5}} {{97.0000076,55.4000015}} wnTs[0]=1 {{97.0000076,20.4999981}, {97.0000076,55.4000015}}
    143 debugShowCubicLineIntersection wtTs[0]=1 {{97.0000076,55.4000015}, {78.2000122,55.4000015}, {62.4000092,68.2000046}, {57.8000069,85.5}} {{57.8000069,85.5}} wnTs[0]=0 {{57.8000069,85.5}, {24.1000061,76.5}}
    144 debugShowCubicLineIntersection wtTs[0]=0 {{24.1000061,76.5}, {22.4000053,82.8000031}, {21.5000057,89.4000015}, {21.5000057,96}} {{24.1000061,76.5}} wnTs[0]=1 {{57.8000069,85.5}, {24.1000061,76.5}}
    145 debugShowCubicLineIntersection wtTs[0]=1 {{24.1000061,76.5}, {22.4000053,82.8000031}, {21.5000057,89.4000015}, {21.5000057,96}} {{21.5000057,96}} wnTs[0]=0 {{21.5000057,96}, {56.4000092,96}}
    146 debugShowCubicLineIntersection wtTs[0]=0 {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}} {{56.4000092,96}} wnTs[0]=1 {{21.5000057,96}, {56.4000092,96}}
    147 debugShowCubicLineIntersection wtTs[0]=1 {{56.4000092,96}, {56.4000092,205.199997}, {228.900009,198.699997}, {228.900009,192}} {{228.900009,192}} wnTs[0]=0 {{228.900009,192}, {172.5,96}}
    148 SkOpSegment::debugShowTs - id=13 [o=12 t=0 117.300003,60.9000015 w=1 o=0] [o=1 t=0.00115 117.320122,60.8652802 w=1 o=0] [o=14 t=1 134.800003,30.7000008 w=1 o=0] operand
    149 SkOpSegment::debugShowTs o id=23 [o=22 t=0 3.33333338e+029,119.400002 w=1 o=0] [o=1,0,12,11,12,14,15,14,16,16,18,20,19,10,27,2,1,3,4,3,5,6,5,9,8,24 t=1 29.3999996,-10.8000002 w=1 o=0] operand
    150 SkOpSegment::addTPair addTPair this=13 0 other=23 0.999999881
    151 SkOpSegment::debugShowTs + id=13 [o=23,12 t=0 117.300003,60.9000015 w=1 o=0] [o=1 t=0.00115 117.320122,60.8652802 w=1 o=0] [o=14 t=1 134.800003,30.7000008 w=1 o=0] operand
    152 SkOpSegment::debugShowTs o id=23 [o=22 t=0 3.33333338e+029,119.400002 w=1 o=0] [o=13 t=1 117.300003,60.9000015 w=1 o=0] [o=1,0,12,11,12,14,15,14,16,16,18,20,19,10,27,2,1,3,4,3,5,6,5,9,8,24 t=1 29.3999996,-10.8000002 w=1 o=0] operand
    153 SkOpSegment::debugShowTs - id=17 [o=16 t=0 62.0000076,75.8000031 w=1 o=0] [o=5 t=0.00504 61.8468246,75.7118225 w=1 o=0] [o=18 t=1 31.6000004,58.2999992 w=1 o=0] operand
    154 SkOpSegment::debugShowTs o id=23 [o=22 t=0 3.33333338e+029,119.400002 w=1 o=0] [o=13 t=1 117.300003,60.9000015 w=1 o=0] [o=1,0,12,11,12,14,15,14,16,16,18,20,19,10,27,2,1,3,4,3,5,6,5,9,8,24 t=1 29.3999996,-10.8000002 w=1 o=0] operand
    155 SkOpSegment::addTPair addTPair this=17 0 other=23 0.999999881
    156 SkOpSegment::debugShowTs + id=17 [o=23,16 t=0 62.0000076,75.8000031 w=1 o=0] [o=5 t=0.00504 61.8468246,75.7118225 w=1 o=0] [o=18 t=1 31.6000004,58.2999992 w=1 o=0] operand
    157 SkOpSegment::debugShowTs o id=23 [o=22 t=0 3.33333338e+029,119.400002 w=1 o=0] [o=13,17 t=1 62.0000076,75.8000031 w=1 o=0] [o=1,0,12,11,12,14,15,14,16,16,18,20,19,10,27,2,1,3,4,3,5,6,5,9,8,24 t=1 29.3999996,-10.8000002 w=1 o=0] operand
    158 SkOpSegment::debugShowTs - id=11 [o=10,27 t=0 172.5,96 w=1 o=0] [o=1,23,12 t=1 137.600006,96 w=1 o=0] operand
    159 SkOpSegment::debugShowTs o id=0 [o=10,27 t=0 172.5,96 w=1 o=0] [o=1,23,12 t=1 137.600006,96 w=1 o=0]
    160 SkOpSegment::debugShowTs + id=11 [o=10,27 t=0 172.5,96 w=1 o=0] [o=1,23,12 t=1 137.600006,96 w=1 o=0] operand
    161 SkOpSegment::debugShowTs o id=0 [o=10,27 t=0 172.5,96 w=1 o=0] [o=1,23,12 t=1 137.600006,96 w=1 o=0]
    162 SkOpSegment::debugShowTs - id=19 [o=18 t=0 21.5,96 w=1 o=0] [o=7 t=1.64e-007 21.5000057,96 w=1 o=0] [o=23,20 t=1 56.4000015,96 w=1 o=0] operand
    163 SkOpSegment::debugShowTs o id=8 [o=7 t=0 21.5000057,96 w=1 o=0] [o=20 t=1 56.4000015,96 w=1 o=0] [o=9,23 t=1 56.4000092,96 w=1 o=0]
    164 SkOpSegment::addTPair addTPair this=19 1.63955463e-007 other=8 0
    165 SkOpSegment::addTPair addTPair this=8 0.999999781 other=19 1
    166 SkOpSegment::debugShowTs + id=19 [o=18 t=0 21.5,96 w=1 o=0] [o=8,7 t=1.64e-007 21.5000057,96 w=1 o=0] [o=8,23,20 t=1 56.4000015,96 w=1 o=0] operand
    167 SkOpSegment::debugShowTs o id=8 [o=19,7 t=0 21.5000057,96 w=1 o=0] [o=19,20 t=1 56.4000015,96 w=1 o=0] [o=9,23 t=1 56.4000092,96 w=1 o=0]
    168 SkOpContour::calcCoincidentWinding count=4
    169 
    170 </div>
    171 
    172 </div>
    173 
    174 <script type="text/javascript">
    175 
    176 var testDivs = [
    177     fuzz487a,
    178 ];
    179 
    180 var decimal_places = 3; // make this 3 to show more precision
    181 
    182 var tests = [];
    183 var testLines = [];
    184 var testTitles = [];
    185 var testIndex = 0;
    186 var ctx;
    187 
    188 var xmin, xmax, focusXmin, focusXmax;
    189 var ymin, ymax, focusYmin, focusYmax;
    190 var scale;
    191 var mouseX, mouseY;
    192 var srcLeft, srcTop;
    193 var screenWidth, screenHeight;
    194 var drawnPts, drawnLines, drawnQuads, drawnCubics;
    195 var curveT = 0;
    196 
    197 var pt_labels = 2;
    198 var collect_bounds = false;
    199 var control_lines = 0;
    200 var curve_t = false;
    201 var debug_xy = 1;
    202 var focus_enabled = false;
    203 var focus_on_selection = false;
    204 var step_limit = 0;
    205 var draw_active = false;
    206 var draw_add = false;
    207 var draw_angle = 0;
    208 var draw_deriviatives = 0;
    209 var draw_hints = false;
    210 var draw_hodo = 0;
    211 var draw_id = false;
    212 var draw_intersection = 0;
    213 var draw_intersectT = false;
    214 var draw_legend = true;
    215 var draw_log = false;
    216 var draw_mark = false;
    217 var draw_midpoint = false;
    218 var draw_op = 0;
    219 var draw_sequence = false;
    220 var draw_sort = 0;
    221 var draw_path = 3;
    222 var draw_computed = 0;
    223 var retina_scale = !!window.devicePixelRatio;
    224 
    225 var activeCount = 0;
    226 var addCount = 0;
    227 var angleCount = 0;
    228 var opCount = 0;
    229 var sectCount = 0;
    230 var sortCount = 0;
    231 var markCount = 0;
    232 var activeMax = 0;
    233 var addMax = 0;
    234 var angleMax = 0;
    235 var sectMax = 0;
    236 var sectMax2 = 0;
    237 var sortMax = 0;
    238 var markMax = 0;
    239 var opMax = 0;
    240 var stepMax = 0;
    241 var lastIndex = 0;
    242 var hasPath = false;
    243 var hasComputedPath = false;
    244 
    245 var firstActiveSpan = -1;
    246 var logStart = -1;
    247 var logRange = 0;
    248 
    249 var SPAN_ID = 0;
    250 var SPAN_X1 = SPAN_ID + 1;
    251 var SPAN_Y1 = SPAN_X1 + 1;
    252 var SPAN_X2 = SPAN_Y1 + 1;
    253 var SPAN_Y2 = SPAN_X2 + 1;
    254 var SPAN_L_T = SPAN_Y2 + 1;
    255 var SPAN_L_TX = SPAN_L_T + 1;
    256 var SPAN_L_TY = SPAN_L_TX + 1;
    257 var SPAN_L_TEND = SPAN_L_TY + 1;
    258 var SPAN_L_OTHER = SPAN_L_TEND + 1;
    259 var SPAN_L_OTHERT = SPAN_L_OTHER + 1;
    260 var SPAN_L_OTHERI = SPAN_L_OTHERT + 1;
    261 var SPAN_L_SUM = SPAN_L_OTHERI + 1;
    262 var SPAN_L_VAL = SPAN_L_SUM + 1;
    263 var SPAN_L_OPP = SPAN_L_VAL + 1;
    264 
    265 var SPAN_X3 = SPAN_Y2 + 1;
    266 var SPAN_Y3 = SPAN_X3 + 1;
    267 var SPAN_Q_T = SPAN_Y3 + 1;
    268 var SPAN_Q_TX = SPAN_Q_T + 1;
    269 var SPAN_Q_TY = SPAN_Q_TX + 1;
    270 var SPAN_Q_TEND = SPAN_Q_TY + 1;
    271 var SPAN_Q_OTHER = SPAN_Q_TEND + 1;
    272 var SPAN_Q_OTHERT = SPAN_Q_OTHER + 1;
    273 var SPAN_Q_OTHERI = SPAN_Q_OTHERT + 1;
    274 var SPAN_Q_SUM = SPAN_Q_OTHERI + 1;
    275 var SPAN_Q_VAL = SPAN_Q_SUM + 1;
    276 var SPAN_Q_OPP = SPAN_Q_VAL + 1;
    277 
    278 var SPAN_X4 = SPAN_Y3 + 1;
    279 var SPAN_Y4 = SPAN_X4 + 1;
    280 var SPAN_C_T = SPAN_Y4 + 1;
    281 var SPAN_C_TX = SPAN_C_T + 1;
    282 var SPAN_C_TY = SPAN_C_TX + 1;
    283 var SPAN_C_TEND = SPAN_C_TY + 1;
    284 var SPAN_C_OTHER = SPAN_C_TEND + 1;
    285 var SPAN_C_OTHERT = SPAN_C_OTHER + 1;
    286 var SPAN_C_OTHERI = SPAN_C_OTHERT + 1;
    287 var SPAN_C_SUM = SPAN_C_OTHERI + 1;
    288 var SPAN_C_VAL = SPAN_C_SUM + 1;
    289 var SPAN_C_OPP = SPAN_C_VAL + 1;
    290 
    291 var ACTIVE_LINE_SPAN =        1;
    292 var ACTIVE_QUAD_SPAN =        ACTIVE_LINE_SPAN + 1;
    293 var ACTIVE_CUBIC_SPAN =       ACTIVE_QUAD_SPAN + 1;
    294 
    295 var ADD_MOVETO =              ACTIVE_CUBIC_SPAN + 1;
    296 var ADD_LINETO =              ADD_MOVETO + 1;
    297 var ADD_QUADTO =              ADD_LINETO + 1;
    298 var ADD_CUBICTO =             ADD_QUADTO + 1;
    299 var ADD_CLOSE =               ADD_CUBICTO + 1;
    300 var ADD_FILL =                ADD_CLOSE + 1;
    301 
    302 var PATH_LINE =               ADD_FILL + 1;
    303 var PATH_QUAD =               PATH_LINE + 1;
    304 var PATH_CUBIC =              PATH_QUAD + 1;
    305 
    306 var INTERSECT_LINE =          PATH_CUBIC + 1;
    307 var INTERSECT_LINE_2 =        INTERSECT_LINE + 1;
    308 var INTERSECT_LINE_NO =       INTERSECT_LINE_2 + 1;
    309 var INTERSECT_QUAD_LINE =     INTERSECT_LINE_NO + 1;
    310 var INTERSECT_QUAD_LINE_2 =   INTERSECT_QUAD_LINE + 1;
    311 var INTERSECT_QUAD_LINE_NO =  INTERSECT_QUAD_LINE_2 + 1;
    312 var INTERSECT_QUAD =          INTERSECT_QUAD_LINE_NO + 1;
    313 var INTERSECT_QUAD_2 =        INTERSECT_QUAD + 1;
    314 var INTERSECT_QUAD_NO =       INTERSECT_QUAD_2 + 1;
    315 var INTERSECT_SELF_CUBIC =    INTERSECT_QUAD_NO + 1;
    316 var INTERSECT_SELF_CUBIC_NO = INTERSECT_SELF_CUBIC + 1;
    317 var INTERSECT_CUBIC_LINE =    INTERSECT_SELF_CUBIC_NO + 1;
    318 var INTERSECT_CUBIC_LINE_2 =  INTERSECT_CUBIC_LINE + 1;
    319 var INTERSECT_CUBIC_LINE_3 =  INTERSECT_CUBIC_LINE_2 + 1;
    320 var INTERSECT_CUBIC_LINE_NO = INTERSECT_CUBIC_LINE_3 + 1;
    321 var INTERSECT_CUBIC_QUAD =    INTERSECT_CUBIC_LINE_NO + 1;
    322 var INTERSECT_CUBIC_QUAD_2 =  INTERSECT_CUBIC_QUAD + 1;
    323 var INTERSECT_CUBIC_QUAD_3 =  INTERSECT_CUBIC_QUAD_2 + 1;
    324 var INTERSECT_CUBIC_QUAD_4 =  INTERSECT_CUBIC_QUAD_3 + 1;
    325 var INTERSECT_CUBIC_QUAD_NO = INTERSECT_CUBIC_QUAD_4 + 1;
    326 var INTERSECT_CUBIC =         INTERSECT_CUBIC_QUAD_NO + 1;
    327 var INTERSECT_CUBIC_2 =       INTERSECT_CUBIC + 1;
    328 var INTERSECT_CUBIC_3 =       INTERSECT_CUBIC_2 + 1;
    329 var INTERSECT_CUBIC_4 =       INTERSECT_CUBIC_3 + 1;
    330 // FIXME: add cubic 5- 9
    331 var INTERSECT_CUBIC_NO =      INTERSECT_CUBIC_4 + 1;
    332 
    333 var SORT_UNARY =              INTERSECT_CUBIC_NO + 1;
    334 var SORT_BINARY =             SORT_UNARY + 1;
    335 
    336 var OP_DIFFERENCE =           SORT_BINARY + 1;
    337 var OP_INTERSECT =            OP_DIFFERENCE + 1;
    338 var OP_UNION =                OP_INTERSECT + 1;
    339 var OP_XOR =                  OP_UNION + 1;
    340 
    341 var MARK_LINE =               OP_XOR + 1;
    342 var MARK_QUAD =               MARK_LINE + 1;
    343 var MARK_CUBIC =              MARK_QUAD + 1;
    344 var MARK_DONE_LINE =          MARK_CUBIC + 1;
    345 var MARK_DONE_QUAD =          MARK_DONE_LINE + 1;
    346 var MARK_DONE_CUBIC =         MARK_DONE_QUAD + 1;
    347 var MARK_UNSORTABLE_LINE =    MARK_DONE_CUBIC + 1;
    348 var MARK_UNSORTABLE_QUAD =    MARK_UNSORTABLE_LINE + 1;
    349 var MARK_UNSORTABLE_CUBIC =   MARK_UNSORTABLE_QUAD + 1;
    350 var MARK_SIMPLE_LINE =        MARK_UNSORTABLE_CUBIC + 1;
    351 var MARK_SIMPLE_QUAD =        MARK_SIMPLE_LINE + 1;
    352 var MARK_SIMPLE_CUBIC =       MARK_SIMPLE_QUAD + 1;
    353 var MARK_SIMPLE_DONE_LINE =   MARK_SIMPLE_CUBIC + 1;
    354 var MARK_SIMPLE_DONE_QUAD =   MARK_SIMPLE_DONE_LINE + 1;
    355 var MARK_SIMPLE_DONE_CUBIC =  MARK_SIMPLE_DONE_QUAD + 1;
    356 var MARK_DONE_UNARY_LINE =    MARK_SIMPLE_DONE_CUBIC + 1;
    357 var MARK_DONE_UNARY_QUAD =    MARK_DONE_UNARY_LINE + 1;
    358 var MARK_DONE_UNARY_CUBIC =   MARK_DONE_UNARY_QUAD + 1;
    359 var MARK_ANGLE_LAST =         MARK_DONE_UNARY_CUBIC + 1;
    360 
    361 var COMPUTED_SET_1 =          MARK_ANGLE_LAST + 1;
    362 var COMPUTED_SET_2 =          COMPUTED_SET_1 + 1;
    363 
    364 var ANGLE_AFTER =             COMPUTED_SET_2;
    365 var ANGLE_AFTER2 =            ANGLE_AFTER + 1;
    366 
    367 var ACTIVE_OP =               ANGLE_AFTER2 + 1;
    368 
    369 var FRAG_TYPE_LAST =          ACTIVE_OP;
    370 
    371 var REC_TYPE_UNKNOWN = -1;
    372 var REC_TYPE_PATH = 0;
    373 var REC_TYPE_SECT = 1;
    374 var REC_TYPE_ACTIVE = 2;
    375 var REC_TYPE_ADD = 3;
    376 var REC_TYPE_SORT = 4;
    377 var REC_TYPE_OP = 5;
    378 var REC_TYPE_MARK = 6;
    379 var REC_TYPE_COMPUTED = 7;
    380 var REC_TYPE_COIN = 8;
    381 var REC_TYPE_ANGLE = 9;
    382 var REC_TYPE_ACTIVE_OP = 10;
    383 var REC_TYPE_LAST = REC_TYPE_ACTIVE_OP;
    384 
    385 function strs_to_nums(strs) {
    386     var result = [];
    387     for (var idx = 1; idx < strs.length; ++idx) {
    388         var str = strs[idx];
    389         var num = parseFloat(str);
    390         if (isNaN(num)) {
    391             result.push(str);
    392         } else {
    393             result.push(num);
    394         }
    395     }
    396     return result;
    397 }
    398 
    399 function filter_str_by(id, str, regex, array) {
    400     if (regex.test(str)) {
    401         var strs = regex.exec(str);
    402         var result = strs_to_nums(strs);
    403         array.push(id);
    404         array.push(result);
    405         return true;
    406     }
    407     return false;
    408 }
    409 
    410 function construct_regexp2(pattern) {
    411     var escape = pattern.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&');
    412     escape = escape.replace(/UNSORTABLE/g, "\\*\\*\\* UNSORTABLE \\*\\*\\*");
    413     escape = escape.replace(/CUBIC_VAL/g, "\\(P_VAL P_VAL P_VAL P_VAL\\)");
    414     escape = escape.replace(/QUAD_VAL/g, "\\(P_VAL P_VAL P_VAL\\)");
    415     escape = escape.replace(/LINE_VAL/g, "\\(P_VAL P_VAL\\)");
    416     escape = escape.replace(/FILL_TYPE/g, "SkPath::k[a-zA-Z]+_FillType");
    417     escape = escape.replace(/PT_VAL/g, "\\(P_VAL\\)");
    418     escape = escape.replace(/P_VAL/g, "(-?\\d+\\.?\\d*(?:e-?\\d+)?)[Ff]?, ?(-?\\d+\\.?\\d*(?:e-?\\d+)?)[Ff]?");
    419     escape = escape.replace(/T_VAL/g, "(-?\\d+\\.?\\d*(?:e-?\\d+)?)");
    420     escape = escape.replace(/PATH/g, "pathB?");
    421     escape = escape.replace(/IDX/g, "(\\d+)");
    422     escape = escape.replace(/NUM/g, "(-?\\d+)");
    423     escape = escape.replace(/OPT/g, "(\\?|-?\\d+)");
    424     return new RegExp(escape, 'i');
    425 }
    426 
    427 function construct_regexp2c(pattern) {
    428     var escape = pattern.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&');
    429     escape = escape.replace(/UNSORTABLE/g, "\\*\\*\\* UNSORTABLE \\*\\*\\*");
    430     escape = escape.replace(/CUBIC_VAL/g, "(?:\\$\\d = )?\\{\\{P_VAL\\}, \\{P_VAL\\}, \\{P_VAL\\}, \\{P_VAL\\}\\}");
    431     escape = escape.replace(/QUAD_VAL/g, "(?:\\$\\d = )?\\{\\{P_VAL\\}, \\{P_VAL\\}, \\{P_VAL\\}\\}");
    432     escape = escape.replace(/LINE_VAL/g, "(?:\\$\\d = )?\\{\\{P_VAL\\}, \\{P_VAL\\}\\}");
    433     escape = escape.replace(/FILL_TYPE/g, "SkPath::k[a-zA-Z]+_FillType");
    434     escape = escape.replace(/PT_VAL/g, "\\{\\{P_VAL\\}\\}");
    435     escape = escape.replace(/P_VAL/g, "(?:f?[xX] = )?(-?\\d+\\.?\\d*(?:e-?\\d+)?)[Ff]?,(?: f?[yY] = )?(-?\\d+\\.?\\d*(?:e-?\\d+)?)[Ff]?");
    436     escape = escape.replace(/T_VAL/g, "(-?\\d+\\.?\\d*(?:e-?\\d+)?)");
    437     escape = escape.replace(/OPER/g, "[a-z]+");
    438     escape = escape.replace(/PATH/g, "pathB?");
    439     escape = escape.replace(/T_F/g, "([TF])");
    440     escape = escape.replace(/IDX/g, "(\\d+)");
    441     escape = escape.replace(/NUM/g, "(-?\\d+)");
    442     escape = escape.replace(/OPT/g, "(\\?|-?\\d+)");
    443     return new RegExp(escape, 'i');
    444 }
    445 
    446 function match_regexp(str, lineNo, array, id, pattern) {
    447     var regex = construct_regexp2(pattern);
    448     if (filter_str_by(id, str, regex, array)) {
    449         return true;
    450     }
    451     regex = construct_regexp2c(pattern);
    452     return filter_str_by(id, str, regex, array);
    453 }
    454 
    455 function endsWith(str, suffix) {
    456     return str.indexOf(suffix, str.length - suffix.length) !== -1;
    457 }
    458 
    459 function parse_all(test) {
    460     var lines = test.match(/[^\r\n]+/g);
    461     var records = []; // a rec can be the original paths, a set of intersections, a set of active spans, a sort, or a path add
    462     var record = [];
    463     var recType = REC_TYPE_UNKNOWN;
    464     var lastLineNo;
    465     var moveX, moveY;
    466     for (var lineNo = 0; lineNo < lines.length; ++lineNo) {
    467         var line = lines[lineNo];
    468         if (line.length == 0) {
    469             continue;
    470         }
    471         var opStart = "SkOpSegment::";
    472         if (line.lastIndexOf(opStart, 0) === 0) {
    473             line = line.substr(opStart.length);
    474         }
    475         var angleStart = "SkOpAngle::";
    476         if (line.lastIndexOf(angleStart, 0) === 0) {
    477             line = line.substr(angleStart.length);
    478         }
    479         var type = line.lastIndexOf("debugShowActiveSpans", 0) === 0 ? REC_TYPE_ACTIVE 
    480                 : line.lastIndexOf("debugShowTs", 0) === 0 ? REC_TYPE_COIN 
    481                 : line.lastIndexOf("debugShow", 0) === 0 ? REC_TYPE_SECT
    482                 : line.lastIndexOf("activeOp", 0) === 0 ? REC_TYPE_ACTIVE_OP
    483                 : line.lastIndexOf("computed", 0) === 0 ? REC_TYPE_COMPUTED
    484                 : line.lastIndexOf("debugOne", 0) === 0 ? REC_TYPE_SORT
    485                 : line.lastIndexOf("dumpOne", 0) === 0 ? REC_TYPE_SORT
    486                 : line.lastIndexOf("pathB.", 0) === 0 ? REC_TYPE_ADD
    487                 : line.lastIndexOf("path.", 0) === 0 ? REC_TYPE_ADD
    488                 : line.lastIndexOf("after", 0) === 0 ? REC_TYPE_ANGLE
    489                 : line.lastIndexOf("mark", 0) === 0 ? REC_TYPE_MARK
    490                 : line.lastIndexOf("  {{", 0) === 0 ? REC_TYPE_COMPUTED
    491                 : line.lastIndexOf("{{", 0) === 0 ? REC_TYPE_PATH
    492                 : line.lastIndexOf("op", 0) === 0 ? REC_TYPE_OP
    493                 : line.lastIndexOf("$", 0) === 0 ? REC_TYPE_PATH
    494                 : REC_TYPE_UNKNOWN;
    495         if (recType != type || recType == REC_TYPE_ADD || recType == REC_TYPE_SECT
    496                 || recType == REC_TYPE_ACTIVE_OP || recType == REC_TYPE_ANGLE) {
    497             if (recType != REC_TYPE_UNKNOWN) {
    498                 records.push(recType);
    499                 records.push(lastLineNo);
    500                 records.push(record);
    501             }
    502             record = [];
    503             recType = type;
    504             lastLineNo = lineNo;
    505         }
    506         var found = false;
    507         switch (recType) {
    508             case REC_TYPE_ACTIVE:
    509                 found = match_regexp(line, lineNo, record, ACTIVE_LINE_SPAN, "debugShowActiveSpans" +
    510 " id=IDX LINE_VAL t=T_VAL PT_VAL tEnd=T_VAL other=IDX otherT=T_VAL otherIndex=IDX windSum=OPT windValue=IDX oppValue=NUM"
    511                 ) || match_regexp(line, lineNo, record, ACTIVE_QUAD_SPAN, "debugShowActiveSpans" +
    512 " id=IDX QUAD_VAL t=T_VAL PT_VAL tEnd=T_VAL other=IDX otherT=T_VAL otherIndex=IDX windSum=OPT windValue=IDX oppValue=NUM"
    513                 ) || match_regexp(line, lineNo, record, ACTIVE_CUBIC_SPAN, "debugShowActiveSpans" +
    514 " id=IDX CUBIC_VAL t=T_VAL PT_VAL tEnd=T_VAL other=IDX otherT=T_VAL otherIndex=IDX windSum=OPT windValue=IDX oppValue=NUM"
    515                 );
    516                 break;
    517             case REC_TYPE_ACTIVE_OP:
    518                 found = match_regexp(line, lineNo, record, ACTIVE_OP, "activeOp" +
    519 " id=IDX t=T_VAL tEnd=T_VAL op=OPER miFrom=NUM miTo=NUM suFrom=NUM suTo=NUM result=IDX"
    520                 );
    521                 break;
    522             case REC_TYPE_ADD:
    523                 if (match_regexp(line, lineNo, record, ADD_MOVETO, "PATH.moveTo(P_VAL);")) {
    524                     moveX = record[1][0];
    525                     moveY = record[1][1];
    526                     found = true;
    527                 } else if (match_regexp(line, lineNo, record, ADD_LINETO, "PATH.lineTo(P_VAL);")) {
    528                     record[1].unshift(moveY);
    529                     record[1].unshift(moveX);
    530                     moveX = record[1][2];
    531                     moveY = record[1][3];
    532                     found = true;
    533                 } else if (match_regexp(line, lineNo, record, ADD_QUADTO, "PATH.quadTo(P_VAL, P_VAL);")) {
    534                     record[1].unshift(moveY);
    535                     record[1].unshift(moveX);
    536                     moveX = record[1][4];
    537                     moveY = record[1][5];
    538                     found = true;
    539                 } else if (match_regexp(line, lineNo, record, ADD_CUBICTO, "PATH.cubicTo(P_VAL, P_VAL, P_VAL);")) {
    540                     record[1].unshift(moveY);
    541                     record[1].unshift(moveX);
    542                     moveX = record[1][6];
    543                     moveY = record[1][7];
    544                     found = true;
    545                 } else if (match_regexp(line, lineNo, record, ADD_FILL, "PATH.setFillType(FILL_TYPE);")) {
    546                     found = true;
    547                 } else {
    548                     found = match_regexp(line, lineNo, record, ADD_CLOSE, "PATH.close();");
    549                 }
    550                 break;
    551             case REC_TYPE_ANGLE:
    552                 found = match_regexp(line, lineNo, record, ANGLE_AFTER, "after " +
    553 "id=IDX IDX/IDX tStart=T_VAL tEnd=T_VAL < id=IDX IDX/IDX tStart=T_VAL tEnd=T_VAL < id=IDX IDX/IDX tStart=T_VAL tEnd=T_VAL  T_F IDX");
    554                 if (found) {
    555                     break;
    556                 }
    557                 found = match_regexp(line, lineNo, record, ANGLE_AFTER2, "after " +
    558 "[IDX/IDX] NUM/NUM tStart=T_VAL tEnd=T_VAL < [IDX/IDX] NUM/NUM tStart=T_VAL tEnd=T_VAL < [IDX/IDX] NUM/NUM tStart=T_VAL tEnd=T_VAL  T_F IDX");
    559                 break;
    560             case REC_TYPE_COIN:
    561                 found = true;
    562                 break;
    563             case REC_TYPE_COMPUTED:
    564                 found = line ==  "computed quadratics given"
    565                   || match_regexp(line, lineNo, record, COMPUTED_SET_1, "computed quadratics set 1"
    566                 ) || match_regexp(line, lineNo, record, COMPUTED_SET_2, "computed quadratics set 2"
    567                 ) || match_regexp(line, lineNo, record, PATH_QUAD, "  QUAD_VAL,"
    568                 ) || match_regexp(line, lineNo, record, PATH_CUBIC, "  CUBIC_VAL,"
    569                 );
    570                 break;
    571             case REC_TYPE_PATH:
    572                 found = match_regexp(line, lineNo, record, PATH_LINE, "LINE_VAL"
    573                 ) || match_regexp(line, lineNo, record, PATH_QUAD, "QUAD_VAL"
    574                 ) || match_regexp(line, lineNo, record, PATH_CUBIC, "CUBIC_VAL"
    575                 );
    576                 break;
    577             case REC_TYPE_SECT:
    578                 found = match_regexp(line, lineNo, record, INTERSECT_LINE, "debugShowLineIntersection" +
    579 " wtTs[0]=T_VAL LINE_VAL PT_VAL wnTs[0]=T_VAL LINE_VAL"
    580                 ) || match_regexp(line, lineNo, record, INTERSECT_LINE_2, "debugShowLineIntersection" +
    581 " wtTs[0]=T_VAL LINE_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wnTs[0]=T_VAL LINE_VAL wnTs[1]=T_VAL"
    582                 ) || match_regexp(line, lineNo, record, INTERSECT_LINE_NO, "debugShowLineIntersection" +
    583 " no intersect LINE_VAL LINE_VAL"
    584                 ) || match_regexp(line, lineNo, record, INTERSECT_QUAD_LINE, "debugShowQuadLineIntersection" +
    585 " wtTs[0]=T_VAL QUAD_VAL PT_VAL wnTs[0]=T_VAL LINE_VAL"
    586                 ) || match_regexp(line, lineNo, record, INTERSECT_QUAD_LINE_2, "debugShowQuadLineIntersection" +
    587 " wtTs[0]=T_VAL QUAD_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wnTs[0]=T_VAL LINE_VAL wnTs[1]=T_VAL"
    588                 ) || match_regexp(line, lineNo, record, INTERSECT_QUAD_LINE_NO, "debugShowQuadLineIntersection" +
    589 " no intersect QUAD_VAL LINE_VAL"
    590                 ) || match_regexp(line, lineNo, record, INTERSECT_QUAD, "debugShowQuadIntersection" +
    591 " wtTs[0]=T_VAL QUAD_VAL PT_VAL wnTs[0]=T_VAL QUAD_VAL"
    592                 ) || match_regexp(line, lineNo, record, INTERSECT_QUAD_2, "debugShowQuadIntersection" +
    593 " wtTs[0]=T_VAL QUAD_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wnTs[0]=T_VAL QUAD_VAL wnTs[1]=T_VAL"
    594                 ) || match_regexp(line, lineNo, record, INTERSECT_QUAD_NO, "debugShowQuadIntersection" +
    595 " no intersect QUAD_VAL QUAD_VAL"
    596                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_LINE, "debugShowCubicLineIntersection" +
    597 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wnTs[0]=T_VAL LINE_VAL"
    598                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_LINE_2, "debugShowCubicLineIntersection" +
    599 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wnTs[0]=T_VAL LINE_VAL wnTs[1]=T_VAL"
    600                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_LINE_3, "debugShowCubicLineIntersection" +
    601 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wtTs[2]=T_VAL PT_VAL wnTs[0]=T_VAL LINE_VAL wnTs[1]=T_VAL wnTs[2]=T_VAL"
    602                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_LINE_NO, "debugShowCubicLineIntersection" +
    603 " no intersect CUBIC_VAL LINE_VAL"
    604                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_QUAD, "debugShowCubicQuadIntersection" +
    605 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wnTs[0]=T_VAL QUAD_VAL"
    606                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_QUAD_2, "debugShowCubicQuadIntersection" +
    607 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wnTs[0]=T_VAL QUAD_VAL wnTs[1]=T_VAL"
    608                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_QUAD_3, "debugShowCubicQuadIntersection" +
    609 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wtTs[2]=T_VAL PT_VAL wnTs[0]=T_VAL QUAD_VAL wnTs[1]=T_VAL wnTs[2]=T_VAL"
    610                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_QUAD_4, "debugShowCubicQuadIntersection" +
    611 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wtTs[2]=T_VAL wtTs[3]=T_VAL PT_VAL wnTs[0]=T_VAL QUAD_VAL wnTs[1]=T_VAL wnTs[2]=T_VAL wnTs[3]=T_VAL"
    612                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_QUAD_NO, "debugShowCubicQuadIntersection" +
    613 " no intersect CUBIC_VAL QUAD_VAL"
    614                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC, "debugShowCubicIntersection" +
    615 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wnTs[0]=T_VAL CUBIC_VAL"
    616                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_2, "debugShowCubicIntersection" +
    617 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wnTs[0]=T_VAL CUBIC_VAL wnTs[1]=T_VAL"
    618                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_3, "debugShowCubicIntersection" +
    619 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wtTs[2]=T_VAL PT_VAL wnTs[0]=T_VAL CUBIC_VAL wnTs[1]=T_VAL wnTs[2]=T_VAL"
    620                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_4, "debugShowCubicIntersection" +
    621 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wtTs[1]=T_VAL PT_VAL wtTs[2]=T_VAL PT_VAL wtTs[3]=T_VAL PT_VAL wnTs[0]=T_VAL CUBIC_VAL wnTs[1]=T_VAL wnTs[2]=T_VAL wnTs[3]=T_VAL"
    622                 ) || match_regexp(line, lineNo, record, INTERSECT_CUBIC_NO, "debugShowCubicIntersection" +
    623 " no intersect CUBIC_VAL CUBIC_VAL"
    624                 ) || match_regexp(line, lineNo, record, INTERSECT_SELF_CUBIC, "debugShowCubicIntersection" +
    625 " wtTs[0]=T_VAL CUBIC_VAL PT_VAL wtTs[1]=T_VAL"
    626                 ) || match_regexp(line, lineNo, record, INTERSECT_SELF_CUBIC_NO, "debugShowCubicIntersection" +
    627 " no self intersect CUBIC_VAL"
    628                 );
    629                 break;
    630             case REC_TYPE_SORT:
    631                 var hasDone = / done/.test(line);
    632                 var hasUnorderable = / unorderable/.test(line);
    633                 var hasSmall = / small/.test(line);
    634                 var hasTiny = / tiny/.test(line);
    635                 var hasOperand = / operand/.test(line);
    636                 var hasStop = / stop/.test(line);
    637                 line.replace(/[ a-z]+$/, "");
    638                 found = match_regexp(line, lineNo, record, SORT_UNARY, "debugOne" +
    639 " [IDX/IDX] next=IDX/IDX sect=IDX/IDX  s=T_VAL [IDX] e=T_VAL [IDX] sgn=NUM windVal=IDX windSum=OPT"
    640                 ) || match_regexp(line, lineNo, record, SORT_BINARY, "debugOne" +
    641 " [IDX/IDX] next=IDX/IDX sect=IDX/IDX  s=T_VAL [IDX] e=T_VAL [IDX] sgn=NUM windVal=IDX windSum=OPT oppVal=IDX oppSum=OPT"
    642                 ) || match_regexp(line, lineNo, record, SORT_UNARY, "dumpOne" +
    643 " [IDX/IDX] next=IDX/IDX sect=NUM/NUM  s=T_VAL [IDX] e=T_VAL [IDX] sgn=NUM windVal=IDX windSum=OPT"
    644                 ) || match_regexp(line, lineNo, record, SORT_BINARY, "dumpOne" +
    645 " [IDX/IDX] next=IDX/IDX sect=NUM/NUM  s=T_VAL [IDX] e=T_VAL [IDX] sgn=NUM windVal=IDX windSum=OPT oppVal=IDX oppSum=OPT"
    646                 );
    647                 if (found) {
    648                     record[1].push(hasDone);
    649                     record[1].push(hasUnorderable);
    650                     record[1].push(hasSmall);
    651                     record[1].push(hasTiny);
    652                     record[1].push(hasOperand);
    653                     record[1].push(hasStop);
    654                 }
    655                 break;
    656             case REC_TYPE_MARK:
    657                 found = match_regexp(line, lineNo, record, MARK_LINE, "markWinding" +
    658 " id=IDX LINE_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM newOppSum=NUM oppSum=OPT windSum=OPT windValue=IDX"
    659                 ) || match_regexp(line, lineNo, record, MARK_QUAD, "markWinding" +
    660 " id=IDX QUAD_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM newOppSum=NUM oppSum=OPT windSum=OPT windValue=IDX"
    661                 ) || match_regexp(line, lineNo, record, MARK_CUBIC, "markWinding" +
    662 " id=IDX CUBIC_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM newOppSum=NUM oppSum=OPT windSum=OPT windValue=IDX"
    663                 ) || match_regexp(line, lineNo, record, MARK_DONE_LINE, "markDoneBinary" +
    664 " id=IDX LINE_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM newOppSum=NUM oppSum=OPT windSum=OPT windValue=IDX"
    665                 ) || match_regexp(line, lineNo, record, MARK_DONE_QUAD, "markDoneBinary" +
    666 " id=IDX QUAD_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM newOppSum=NUM oppSum=OPT windSum=OPT windValue=IDX"
    667                 ) || match_regexp(line, lineNo, record, MARK_DONE_CUBIC, "markDoneBinary" +
    668 " id=IDX CUBIC_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM newOppSum=NUM oppSum=OPT windSum=OPT windValue=IDX"
    669                 ) || match_regexp(line, lineNo, record, MARK_UNSORTABLE_LINE, "markUnsortable" +
    670 " id=IDX LINE_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    671                 ) || match_regexp(line, lineNo, record, MARK_UNSORTABLE_QUAD, "markUnsortable" +
    672 " id=IDX QUAD_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    673                 ) || match_regexp(line, lineNo, record, MARK_UNSORTABLE_CUBIC, "markUnsortable" +
    674 " id=IDX CUBIC_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    675                 ) || match_regexp(line, lineNo, record, MARK_SIMPLE_LINE, "markWinding" +
    676 " id=IDX LINE_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    677                 ) || match_regexp(line, lineNo, record, MARK_SIMPLE_QUAD, "markWinding" +
    678 " id=IDX QUAD_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    679                 ) || match_regexp(line, lineNo, record, MARK_SIMPLE_CUBIC, "markWinding" +
    680 " id=IDX CUBIC_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    681                 ) || match_regexp(line, lineNo, record, MARK_SIMPLE_DONE_LINE, "markDone" +
    682 " id=IDX LINE_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    683                 ) || match_regexp(line, lineNo, record, MARK_SIMPLE_DONE_QUAD, "markDone" +
    684 " id=IDX QUAD_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    685                 ) || match_regexp(line, lineNo, record, MARK_SIMPLE_DONE_CUBIC, "markDone" +
    686 " id=IDX CUBIC_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    687                 ) || match_regexp(line, lineNo, record, MARK_DONE_UNARY_LINE, "markDoneUnary" +
    688 " id=IDX LINE_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    689                 ) || match_regexp(line, lineNo, record, MARK_DONE_UNARY_QUAD, "markDoneUnary" +
    690 " id=IDX QUAD_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    691                 ) || match_regexp(line, lineNo, record, MARK_DONE_UNARY_CUBIC, "markDoneUnary" +
    692 " id=IDX CUBIC_VAL t=T_VAL [IDX] PT_VAL tEnd=T_VAL newWindSum=NUM windSum=OPT windValue=IDX"
    693                 ) || match_regexp(line, lineNo, record, MARK_ANGLE_LAST, "markAngle" +
    694 " last id=IDX windSum=OPT small=IDX");
    695                 break;
    696             case REC_TYPE_OP:
    697                 if (line.lastIndexOf("oppSign oppSign=", 0) === 0
    698                         || line.lastIndexOf("operator<", 0) === 0) {
    699                     found = true;
    700                     break;
    701                 }
    702                 found = match_regexp(line, lineNo, record, OP_DIFFERENCE, "op difference"
    703                 ) || match_regexp(line, lineNo, record, OP_INTERSECT, "op intersect"
    704                 ) || match_regexp(line, lineNo, record, OP_UNION, "op union"
    705                 ) || match_regexp(line, lineNo, record, OP_XOR, "op xor"
    706                 );
    707                 break;
    708             case REC_TYPE_UNKNOWN:
    709                 found = true;
    710                 break;
    711         }
    712         if (!found) {
    713             console.log(line + " [" + lineNo + "] of type " + type + " not found");
    714         }
    715     }
    716     if (recType != REC_TYPE_UNKNOWN) {
    717         records.push(recType);
    718         records.push(lastLineNo);
    719         records.push(record);
    720     }
    721     if (records.length >= 1) {
    722         tests[testIndex] = records;
    723         testLines[testIndex] = lines;
    724     }
    725 }
    726 
    727 function init(test) {
    728     var canvas = document.getElementById('canvas');
    729     if (!canvas.getContext) return;
    730     ctx = canvas.getContext('2d');
    731     var resScale = retina_scale && window.devicePixelRatio ? window.devicePixelRatio : 1;
    732     var unscaledWidth = window.innerWidth - 20;
    733     var unscaledHeight = window.innerHeight - 20;
    734     screenWidth = unscaledWidth;
    735     screenHeight = unscaledHeight;
    736     canvas.width = unscaledWidth * resScale;
    737     canvas.height = unscaledHeight * resScale;
    738     canvas.style.width = unscaledWidth + 'px';
    739     canvas.style.height = unscaledHeight + 'px';
    740     if (resScale != 1) {
    741         ctx.scale(resScale, resScale);
    742     }
    743     xmin = Infinity;
    744     xmax = -Infinity;
    745     ymin = Infinity;
    746     ymax = -Infinity;
    747     hasPath = hasComputedPath = false;
    748     firstActiveSpan = -1;
    749     for (var tIndex = 0; tIndex < test.length; tIndex += 3) {
    750         var recType = test[tIndex];
    751         if (!typeof recType == 'number' || recType < REC_TYPE_UNKNOWN || recType > REC_TYPE_LAST) {
    752             console.log("unknown rec type: " + recType);
    753             throw "stop execution";
    754         }
    755         var records = test[tIndex + 2];
    756         for (var recordIndex = 0; recordIndex < records.length; recordIndex += 2) {
    757             var fragType = records[recordIndex];
    758             if (!typeof fragType == 'number' || fragType < 1 || fragType > FRAG_TYPE_LAST) {
    759                 console.log("unknown in range frag type: " + fragType);
    760                 throw "stop execution";
    761             }
    762             var frags = records[recordIndex + 1];
    763             var first = 0;
    764             var last = -1;
    765             var first2 = 0;
    766             var last2 = 0;
    767             switch (recType) {
    768                 case REC_TYPE_COMPUTED:
    769                     if (fragType == COMPUTED_SET_1 || fragType == COMPUTED_SET_2) {
    770                         break;
    771                     }
    772                     hasComputedPath = true;
    773                 case REC_TYPE_PATH:
    774                     switch (fragType) {
    775                         case PATH_LINE:
    776                             last = 4;
    777                             break;
    778                         case PATH_QUAD:
    779                             last = 6;
    780                             break;
    781                         case PATH_CUBIC:
    782                             last = 8;
    783                             break;
    784                         default:
    785                             console.log("unknown " + (recType == REC_TYPE_PATH ? "REC_TYPE_PATH" 
    786                                     : "REC_TYPE_COMPUTED") + " frag type:" + fragType);
    787                             throw "stop execution";
    788                     }
    789                     if (recType == REC_TYPE_PATH) {
    790                         hasPath = true;
    791                     }
    792                     break;
    793                 case REC_TYPE_ACTIVE:
    794                     if (firstActiveSpan < 0) {
    795                         firstActiveSpan = tIndex;
    796                     }
    797                     first = 1;
    798                     switch (fragType) {
    799                         case ACTIVE_LINE_SPAN:
    800                             last = 5;
    801                             break;
    802                         case ACTIVE_QUAD_SPAN:
    803                             last = 7;
    804                             break;
    805                         case ACTIVE_CUBIC_SPAN:
    806                             last = 9;
    807                             break;
    808                         default:
    809                             console.log("unknown REC_TYPE_ACTIVE frag type: " + fragType);
    810                             throw "stop execution";
    811                     }
    812                     break;
    813                 case REC_TYPE_ADD:
    814                     switch (fragType) {
    815                         case ADD_MOVETO:
    816                             break;
    817                         case ADD_LINETO:
    818                             last = 4;
    819                             break;
    820                         case ADD_QUADTO:
    821                             last = 6;
    822                             break;
    823                         case ADD_CUBICTO:
    824                             last = 8;
    825                             break;
    826                         case ADD_CLOSE:
    827                         case ADD_FILL:
    828                             break;
    829                         default:
    830                             console.log("unknown REC_TYPE_ADD frag type: " + fragType);
    831                             throw "stop execution";
    832                     }
    833                     break;
    834                 case REC_TYPE_SECT:
    835                     switch (fragType) {
    836                         case INTERSECT_LINE:
    837                             first = 1; last = 5; first2 = 8; last2 = 12;
    838                             break;
    839                         case INTERSECT_LINE_2:
    840                             first = 1; last = 5; first2 = 11; last2 = 15;
    841                             break;
    842                         case INTERSECT_LINE_NO:
    843                             first = 0; last = 4; first2 = 4; last2 = 8;
    844                             break;
    845                         case INTERSECT_QUAD_LINE:
    846                             first = 1; last = 7; first2 = 10; last2 = 14;
    847                             break;
    848                         case INTERSECT_QUAD_LINE_2:
    849                             first = 1; last = 7; first2 = 13; last2 = 17;
    850                             break;
    851                         case INTERSECT_QUAD_LINE_NO:
    852                             first = 0; last = 6; first2 = 6; last2 = 10;
    853                             break;
    854                         case INTERSECT_QUAD:
    855                             first = 1; last = 7; first2 = 10; last2 = 16;
    856                             break;
    857                         case INTERSECT_QUAD_2:
    858                             first = 1; last = 7; first2 = 13; last2 = 19;
    859                             break;
    860                         case INTERSECT_QUAD_NO:
    861                             first = 0; last = 6; first2 = 6; last2 = 12;
    862                             break;
    863                         case INTERSECT_SELF_CUBIC:
    864                             first = 1; last = 9;
    865                             break;
    866                         case INTERSECT_SELF_CUBIC_NO:
    867                             first = 0; last = 8;
    868                             break;
    869                         case INTERSECT_CUBIC_LINE:
    870                             first = 1; last = 9; first2 = 12; last2 = 16;
    871                             break;
    872                         case INTERSECT_CUBIC_LINE_2:
    873                             first = 1; last = 9; first2 = 15; last2 = 19;
    874                             break;
    875                         case INTERSECT_CUBIC_LINE_3:
    876                             first = 1; last = 9; first2 = 18; last2 = 22;
    877                             break;
    878                         case INTERSECT_CUBIC_LINE_NO:
    879                             first = 0; last = 8; first2 = 8; last2 = 12;
    880                             break;
    881                         case INTERSECT_CUBIC_QUAD:
    882                             first = 1; last = 9; first2 = 12; last2 = 18;
    883                             break;
    884                         case INTERSECT_CUBIC_QUAD_2:
    885                             first = 1; last = 9; first2 = 15; last2 = 21;
    886                             break;
    887                         case INTERSECT_CUBIC_QUAD_3:
    888                             first = 1; last = 9; first2 = 18; last2 = 24;
    889                             break;
    890                         case INTERSECT_CUBIC_QUAD_4:
    891                             first = 1; last = 9; first2 = 21; last2 = 27;
    892                             break;
    893                         case INTERSECT_CUBIC_QUAD_NO:
    894                             first = 0; last = 8; first2 = 8; last2 = 14;
    895                             break;
    896                         case INTERSECT_CUBIC:
    897                             first = 1; last = 9; first2 = 12; last2 = 20;
    898                             break;
    899                         case INTERSECT_CUBIC_2:
    900                             first = 1; last = 9; first2 = 15; last2 = 23;
    901                             break;
    902                         case INTERSECT_CUBIC_3:
    903                             first = 1; last = 9; first2 = 18; last2 = 26;
    904                             break;
    905                         case INTERSECT_CUBIC_4:
    906                             first = 1; last = 9; first2 = 21; last2 = 29;
    907                             break;
    908                         case INTERSECT_CUBIC_NO:
    909                             first = 0; last = 8; first2 = 8; last2 = 16;
    910                             break;
    911                         default:
    912                             console.log("unknown REC_TYPE_SECT frag type: " + fragType);
    913                             throw "stop execution";
    914                     }
    915                     break;
    916                 default:
    917                     continue;
    918             }
    919             for (var idx = first; idx < last; idx += 2) {
    920                 xmin = Math.min(xmin, frags[idx]);
    921                 xmax = Math.max(xmax, frags[idx]);
    922                 ymin = Math.min(ymin, frags[idx + 1]);
    923                 ymax = Math.max(ymax, frags[idx + 1]);
    924             }
    925             for (var idx = first2; idx < last2; idx += 2) {
    926                 xmin = Math.min(xmin, frags[idx]);
    927                 xmax = Math.max(xmax, frags[idx]);
    928                 ymin = Math.min(ymin, frags[idx + 1]);
    929                 ymax = Math.max(ymax, frags[idx + 1]);
    930             }
    931         }
    932     }
    933     var angleBounds = [Infinity, Infinity, -Infinity, -Infinity];
    934     for (var tIndex = 0; tIndex < test.length; tIndex += 3) {
    935         var recType = test[tIndex];
    936         var records = test[tIndex + 2];
    937         for (var recordIndex = 0; recordIndex < records.length; recordIndex += 2) {
    938             var fragType = records[recordIndex];
    939             var frags = records[recordIndex + 1];
    940             switch (recType) {
    941                 case REC_TYPE_ACTIVE_OP:
    942                     if (!draw_op) {
    943                         break;
    944                     }
    945                     {
    946                         var curve = curvePartialByID(test, frags[0], frags[1], frags[2]);
    947                         curve_extremes(curve, angleBounds);
    948                     }
    949                     break;
    950                 case REC_TYPE_ANGLE:
    951                     if (!draw_angle) {
    952                         break;
    953                     }
    954                     if (fragType == ANGLE_AFTER) {
    955                         var curve = curvePartialByID(test, frags[0], frags[3], frags[4]);
    956                         curve_extremes(curve, angleBounds);
    957                         curve = curvePartialByID(test, frags[5], frags[8], frags[9]);
    958                         curve_extremes(curve, angleBounds);
    959                         curve = curvePartialByID(test, frags[10], frags[13], frags[14]);
    960                     } else if (fragType == ANGLE_AFTER2) {
    961                         var curve = curvePartialByID(test, frags[0], frags[4], frags[5]);
    962                         curve_extremes(curve, angleBounds);
    963                         curve = curvePartialByID(test, frags[6], frags[10], frags[11]);
    964                         curve_extremes(curve, angleBounds);
    965                         curve = curvePartialByID(test, frags[12], frags[16], frags[17]);
    966                     }
    967                     break;
    968                 case REC_TYPE_SORT:
    969                     if (!draw_sort) {
    970                         break;
    971                     }
    972                     if (fragType == SORT_UNARY || fragType == SORT_BINARY) {
    973                         var curve = curvePartialByID(test, frags[0], frags[6], frags[8]);
    974                         curve_extremes(curve, angleBounds);
    975                     }
    976                     break;
    977             }
    978         }
    979     }
    980     xmin = Math.min(xmin, angleBounds[0]);
    981     ymin = Math.min(ymin, angleBounds[1]);
    982     xmax = Math.max(xmax, angleBounds[2]);
    983     ymax = Math.max(ymax, angleBounds[3]);
    984     setScale(xmin, xmax, ymin, ymax);
    985     if (hasPath == false && hasComputedPath == true && !draw_computed) {
    986         draw_computed = 3; // show both quadratics and cubics
    987     }
    988     if (hasPath == true && hasComputedPath == false && draw_computed) {
    989         draw_computed = 0;
    990     }
    991 }
    992 
    993 function curveByID(test, id) {
    994     var tIndex = firstActiveSpan;
    995     if (tIndex < 0) {
    996         return [];
    997     }
    998     while (tIndex < test.length) {
    999         var recType = test[tIndex];
   1000         if (recType != REC_TYPE_ACTIVE) {
   1001             return [];
   1002         }
   1003         var records = test[tIndex + 2];
   1004         for (var recordIndex = 0; recordIndex < records.length; recordIndex += 2) {
   1005             var fragType = records[recordIndex];
   1006             var frags = records[recordIndex + 1];
   1007             if (frags[0] == id) {
   1008                 switch (fragType) {
   1009                     case ACTIVE_LINE_SPAN:
   1010                         return [frags[1], frags[2], frags[3], frags[4]];
   1011                     case ACTIVE_QUAD_SPAN:
   1012                         return [frags[1], frags[2], frags[3], frags[4],
   1013                                 frags[5], frags[6]];
   1014                     case ACTIVE_CUBIC_SPAN:
   1015                         return [frags[1], frags[2], frags[3], frags[4],
   1016                                 frags[5], frags[6], frags[7], frags[8]];
   1017                 }
   1018             }
   1019         }
   1020         tIndex += 3;
   1021     }
   1022     return [];
   1023 }
   1024 
   1025 function curvePartialByID(test, id, t0, t1) {
   1026     var tIndex = firstActiveSpan;
   1027     if (tIndex < 0) {
   1028         return [];
   1029     }
   1030     while (tIndex < test.length) {
   1031         var recType = test[tIndex];
   1032         if (recType != REC_TYPE_ACTIVE) {
   1033             return [];
   1034         }
   1035         var records = test[tIndex + 2];
   1036         for (var recordIndex = 0; recordIndex < records.length; recordIndex += 2) {
   1037             var fragType = records[recordIndex];
   1038             var frags = records[recordIndex + 1];
   1039             if (frags[0] == id) {
   1040                 switch (fragType) {
   1041                     case ACTIVE_LINE_SPAN:
   1042                         return linePartial(frags[1], frags[2], frags[3], frags[4], t0, t1);
   1043                     case ACTIVE_QUAD_SPAN:
   1044                         return quadPartial(frags[1], frags[2], frags[3], frags[4],
   1045                                 frags[5], frags[6], t0, t1);
   1046                     case ACTIVE_CUBIC_SPAN:
   1047                         return cubicPartial(frags[1], frags[2], frags[3], frags[4],
   1048                                 frags[5], frags[6], frags[7], frags[8], t0, t1);
   1049                 }
   1050             }
   1051         }
   1052         tIndex += 3;
   1053     }
   1054     return [];
   1055 }
   1056 
   1057 function idByCurve(test, frag, type) {
   1058     var tIndex = firstActiveSpan;
   1059     if (tIndex < 0) {
   1060         return -1;
   1061     }
   1062     while (tIndex < test.length) {
   1063         var recType = test[tIndex];
   1064         if (recType != REC_TYPE_ACTIVE) {
   1065             return -1;
   1066         }
   1067         var records = test[tIndex + 2];
   1068         for (var recordIndex = 0; recordIndex < records.length; recordIndex += 2) {
   1069             var fragType = records[recordIndex];
   1070             var frags = records[recordIndex + 1];
   1071             switch (fragType) {
   1072                 case ACTIVE_LINE_SPAN:
   1073                     if (type != PATH_LINE) {
   1074                         continue;
   1075                     }
   1076                     if (frag[0] != frags[1] || frag[1] != frags[2]
   1077                             || frag[2] != frags[3] || frag[3] != frags[4]) {
   1078                         continue;
   1079                     }
   1080                     return frags[0];
   1081                 case ACTIVE_QUAD_SPAN:
   1082                     if (type != PATH_QUAD) {
   1083                         continue;
   1084                     }
   1085                     if (frag[0] != frags[1] || frag[1] != frags[2]
   1086                             || frag[2] != frags[3] || frag[3] != frags[4]
   1087                             || frag[4] != frags[5] || frag[5] != frags[6]) {
   1088                         continue;
   1089                     }
   1090                     return frags[0];
   1091                 case ACTIVE_CUBIC_SPAN:
   1092                     if (type != PATH_CUBIC) {
   1093                         continue;
   1094                     }
   1095                     if (frag[0] != frags[1] || frag[1] != frags[2]
   1096                             || frag[2] != frags[3] || frag[3] != frags[4]
   1097                             || frag[4] != frags[5] || frag[5] != frags[6]
   1098                             || frag[6] != frags[7] || frag[7] != frags[8]) {
   1099                         continue;
   1100                     }
   1101                     return frags[0];
   1102             }
   1103         }
   1104         ++tIndex;
   1105     }
   1106     return -1;
   1107 }
   1108 
   1109 function curve_extremes(curve, bounds) {
   1110     for (var index = 0; index < curve.length; index += 2) {
   1111         var x = curve[index];
   1112         var y = curve[index + 1];
   1113         bounds[0] = Math.min(bounds[0], x);
   1114         bounds[1] = Math.min(bounds[1], y);
   1115         bounds[2] = Math.max(bounds[2], x);
   1116         bounds[3] = Math.max(bounds[3], y);
   1117     }
   1118 }
   1119 
   1120 function setScale(x0, x1, y0, y1) {
   1121     var srcWidth = x1 - x0;
   1122     var srcHeight = y1 - y0;
   1123     var usableWidth = screenWidth;
   1124     var xDigits = Math.ceil(Math.log(Math.abs(xmax)) / Math.log(10));
   1125     var yDigits = Math.ceil(Math.log(Math.abs(ymax)) / Math.log(10));
   1126     usableWidth -= (xDigits + yDigits) * 10;
   1127     usableWidth -= decimal_places * 10;
   1128     if (draw_legend) {
   1129         usableWidth -= 40;
   1130     }
   1131     var hscale = usableWidth / srcWidth;
   1132     var vscale = screenHeight / srcHeight;
   1133     scale = Math.min(hscale, vscale);
   1134     var invScale = 1 / scale;
   1135     var sxmin = x0 - invScale * 5;
   1136     var symin = y0 - invScale * 10;
   1137     var sxmax = x1 + invScale * (6 * decimal_places + 10);
   1138     var symax = y1 + invScale * 10;
   1139     srcWidth = sxmax - sxmin;
   1140     srcHeight = symax - symin;
   1141     hscale = usableWidth / srcWidth;
   1142     vscale = screenHeight / srcHeight;
   1143     scale = Math.min(hscale, vscale);
   1144     srcLeft = sxmin;
   1145     srcTop = symin;
   1146 }
   1147 
   1148 function drawArc(curve, op, from, to) {
   1149     var type = PATH_LINE + (curve.length / 2 - 2);
   1150     var pt = pointAtT(curve, type, op ? 0.4 : 0.6);
   1151     var dy = pt.y - curve[1];
   1152     var dx = pt.x - curve[0];
   1153     var dist = Math.sqrt(dy * dy + dx * dx);
   1154     var _dist = dist * scale;
   1155     var angle = Math.atan2(dy, dx);
   1156     var _px = (curve[0] - srcLeft) * scale;
   1157     var _py = (curve[1] - srcTop) * scale;
   1158     var divisor = 4;
   1159     var endDist;
   1160     do {
   1161         var ends = [];
   1162         for (var index = -1; index <= 1; index += 2) {
   1163             var px = Math.cos(index * Math.PI / divisor);
   1164             var py = Math.sin(index * Math.PI / divisor);
   1165             ends.push(px);
   1166             ends.push(py);
   1167         }
   1168         var endDx = (ends[2] - ends[0]) * scale * dist;
   1169         var endDy = (ends[3] - ends[1]) * scale * dist;
   1170         endDist = Math.sqrt(endDx * endDx + endDy * endDy);
   1171         if (endDist < 100) {
   1172             break;
   1173         }
   1174         divisor *= 2;
   1175     } while (true);
   1176     if (endDist < 30) {
   1177         return;
   1178     }
   1179     if (op) {
   1180         divisor *= 2;
   1181     }
   1182     ctx.strokeStyle = op ? "rgba(210,0,45, 0.4)" : "rgba(90,90,90, 0.5)";
   1183     ctx.beginPath();
   1184     ctx.arc(_px, _py, _dist, angle - Math.PI / divisor, angle + Math.PI / divisor, false);
   1185     ctx.stroke();
   1186     var saveAlign = ctx.textAlign;
   1187     var saveStyle = ctx.fillStyle;
   1188     var saveFont = ctx.font;
   1189     ctx.textAlign = "center";
   1190     ctx.fillStyle = "black";
   1191     ctx.font = "normal 24px Arial";
   1192     divisor *= 0.8;
   1193     for (var index = -1; index <= 1; index += 2) {
   1194         var px = curve[0] + Math.cos(angle + index * Math.PI / divisor) * dist;
   1195         var py = curve[1] + Math.sin(angle + index * Math.PI / divisor) * dist;
   1196         var _px = (px - srcLeft) * scale;
   1197         var _py = (py - srcTop) * scale;
   1198         ctx.fillText(index < 0 ? to.toString() : from.toString(), _px, _py + 8);
   1199     }
   1200     ctx.textAlign = saveAlign;
   1201     ctx.fillStyle = saveStyle;
   1202     ctx.font = saveFont;
   1203 }
   1204 
   1205 function drawPoint(px, py, end) {
   1206     for (var pts = 0; pts < drawnPts.length; pts += 2) {
   1207         var x = drawnPts[pts];
   1208         var y = drawnPts[pts + 1];
   1209         if (px == x && py == y) {
   1210             return;
   1211         }
   1212     }
   1213     drawnPts.push(px);
   1214     drawnPts.push(py);
   1215     var label = px.toFixed(decimal_places) + ", " + py.toFixed(decimal_places);
   1216     var _px = (px - srcLeft) * scale;
   1217     var _py = (py - srcTop) * scale;
   1218     ctx.beginPath();
   1219     ctx.arc(_px, _py, 3, 0, Math.PI*2, true);
   1220     ctx.closePath();
   1221     if (end) {
   1222         ctx.fill();
   1223     } else {
   1224         ctx.stroke();
   1225     }
   1226     if (debug_xy) {
   1227         ctx.textAlign = "left";
   1228         ctx.fillText(label, _px + 5, _py);
   1229     }
   1230 }
   1231 
   1232 function drawPoints(ptArray, curveType, drawControls) {
   1233     var count = (curveType - PATH_LINE + 2) * 2;
   1234     for (var idx = 0; idx < count; idx += 2) {
   1235         if (!drawControls && idx != 0 && idx != count - 2) {
   1236             continue;
   1237         }
   1238         drawPoint(ptArray[idx], ptArray[idx + 1], idx == 0 || idx == count - 2);
   1239     }
   1240 }
   1241 
   1242 function drawControlLines(curve, curveType, drawEnd) {
   1243     if (curveType == PATH_LINE) {
   1244         return;
   1245     }
   1246     ctx.strokeStyle = "rgba(0,0,0, 0.3)";
   1247     drawLine(curve[0], curve[1], curve[2], curve[3]);
   1248     drawLine(curve[2], curve[3], curve[4], curve[5]);
   1249     if (curveType == PATH_CUBIC) {
   1250         drawLine(curve[4], curve[5], curve[6], curve[7]);
   1251         if (drawEnd > 1) {
   1252             drawLine(curve[6], curve[7], curve[0], curve[1]);
   1253             if (drawEnd > 2) {
   1254                 drawLine(curve[0], curve[1], curve[4], curve[5]);
   1255                 drawLine(curve[6], curve[7], curve[2], curve[3]);
   1256             }
   1257         }
   1258     } else if (drawEnd > 1) {
   1259         drawLine(curve[4], curve[5], curve[0], curve[1]);
   1260     }
   1261 }
   1262 
   1263 function pointAtT(curve, curveType, t) {
   1264     var xy = {};
   1265     switch (curveType) {
   1266         case PATH_LINE:
   1267             var a = 1 - t;
   1268             var b = t;
   1269             xy.x = a * curve[0] + b * curve[2];
   1270             xy.y = a * curve[1] + b * curve[3];
   1271             break;
   1272         case PATH_QUAD:
   1273             var one_t = 1 - t;
   1274             var a = one_t * one_t;
   1275             var b = 2 * one_t * t;
   1276             var c = t * t;
   1277             xy.x = a * curve[0] + b * curve[2] + c * curve[4];
   1278             xy.y = a * curve[1] + b * curve[3] + c * curve[5];
   1279             break;
   1280         case PATH_CUBIC:
   1281             var one_t = 1 - t;
   1282             var one_t2 = one_t * one_t;
   1283             var a = one_t2 * one_t;
   1284             var b = 3 * one_t2 * t;
   1285             var t2 = t * t;
   1286             var c = 3 * one_t * t2;
   1287             var d = t2 * t;
   1288             xy.x = a * curve[0] + b * curve[2] + c * curve[4] + d * curve[6];
   1289             xy.y = a * curve[1] + b * curve[3] + c * curve[5] + d * curve[7];
   1290             break;
   1291     }
   1292     return xy;
   1293 }
   1294     
   1295 function drawPointAtT(curve, curveType) {
   1296     var x, y;
   1297     var xy = pointAtT(curve, curveType, curveT);
   1298     drawPoint(xy.x, xy.y, true);
   1299     if (!draw_intersectT) {
   1300         return;
   1301     }
   1302     ctx.fillStyle = "red";
   1303     drawTAtPointUp(xy.x, xy.y, curveT);
   1304 }
   1305 
   1306 function drawTAtPointUp(px, py, t) {
   1307     var label = t.toFixed(decimal_places);
   1308     var _px = (px - srcLeft)* scale;
   1309     var _py = (py - srcTop) * scale;
   1310     ctx.fillText(label, _px + 5, _py - 10);
   1311 }
   1312 
   1313 function drawTAtPointDown(px, py, t) {
   1314     var label = t.toFixed(decimal_places);
   1315     var _px = (px - srcLeft)* scale;
   1316     var _py = (py - srcTop) * scale;
   1317     ctx.fillText(label, _px + 5, _py + 10);
   1318 }
   1319 
   1320 function alreadyDrawnLine(x1, y1, x2, y2) {
   1321     if (collect_bounds) {
   1322         if (focus_enabled) {
   1323             focusXmin = Math.min(focusXmin, x1, x2);
   1324             focusYmin = Math.min(focusYmin, y1, y2);
   1325             focusXmax = Math.max(focusXmax, x1, x2);
   1326             focusYmax = Math.max(focusYmax, y1, y2);
   1327         }
   1328         return true;
   1329     }
   1330     for (var pts = 0; pts < drawnLines.length; pts += 4) {
   1331         if (x1 == drawnLines[pts] && y1 == drawnLines[pts + 1]
   1332                 && x2 == drawnLines[pts + 2] && y2 == drawnLines[pts + 3]) {
   1333             return true;
   1334         }
   1335     }
   1336     drawnLines.push(x1);
   1337     drawnLines.push(y1);
   1338     drawnLines.push(x2);
   1339     drawnLines.push(y2);
   1340     return false;
   1341 }
   1342 
   1343 function drawLine(x1, y1, x2, y2) {
   1344     if (alreadyDrawnLine(x1, y1, x2, y2)) {
   1345         return;
   1346     }
   1347     ctx.beginPath();
   1348     ctx.moveTo((x1 - srcLeft) * scale,
   1349             (y1 - srcTop) * scale);
   1350     ctx.lineTo((x2 - srcLeft) * scale,
   1351             (y2 - srcTop) * scale);
   1352     ctx.stroke();
   1353 }
   1354 
   1355 function linePartial(x1, y1, x2, y2, t1, t2) {
   1356     var dx = x1 - x2;
   1357     var dy = y1 - y2;
   1358     var array = [
   1359         x1 - t1 * dx,
   1360         y1 - t1 * dy,
   1361         x1 - t2 * dx,
   1362         y1 - t2 * dy
   1363     ];
   1364     return array;
   1365 }
   1366 
   1367 function drawLinePartial(x1, y1, x2, y2, t1, t2) {
   1368     var a = linePartial(x1, y1, x2, y2, t1, t2);
   1369     var ax = a[0];
   1370     var ay = a[1];
   1371     var bx = a[2];
   1372     var by = a[3];
   1373     if (alreadyDrawnLine(ax, ay, bx, by)) {
   1374         return;
   1375     }
   1376     ctx.beginPath();
   1377     ctx.moveTo((ax - srcLeft) * scale,
   1378             (ay - srcTop) * scale);
   1379     ctx.lineTo((bx - srcLeft) * scale,
   1380             (by - srcTop) * scale);
   1381     ctx.stroke();
   1382 }
   1383 
   1384 function alreadyDrawnQuad(x1, y1, x2, y2, x3, y3) {
   1385     if (collect_bounds) {
   1386         if (focus_enabled) {
   1387             focusXmin = Math.min(focusXmin, x1, x2, x3);
   1388             focusYmin = Math.min(focusYmin, y1, y2, y3);
   1389             focusXmax = Math.max(focusXmax, x1, x2, x3);
   1390             focusYmax = Math.max(focusYmax, y1, y2, y3);
   1391         }
   1392         return true;
   1393     }
   1394     for (var pts = 0; pts < drawnQuads.length; pts += 6) {
   1395         if (x1 == drawnQuads[pts] && y1 == drawnQuads[pts + 1]
   1396                 && x2 == drawnQuads[pts + 2] && y2 == drawnQuads[pts + 3]
   1397                 && x3 == drawnQuads[pts + 4] && y3 == drawnQuads[pts + 5]) {
   1398             return true;
   1399         }
   1400     }
   1401     drawnQuads.push(x1);
   1402     drawnQuads.push(y1);
   1403     drawnQuads.push(x2);
   1404     drawnQuads.push(y2);
   1405     drawnQuads.push(x3);
   1406     drawnQuads.push(y3);
   1407     return false;
   1408 }
   1409 
   1410 function drawQuad(x1, y1, x2, y2, x3, y3) {
   1411     if (alreadyDrawnQuad(x1, y1, x2, y2, x3, y3)) {
   1412         return;
   1413     }
   1414     ctx.beginPath();
   1415     ctx.moveTo((x1 - srcLeft) * scale,
   1416             (y1 - srcTop) * scale);
   1417     ctx.quadraticCurveTo((x2 - srcLeft) * scale,
   1418             (y2 - srcTop) * scale,
   1419             (x3 - srcLeft) * scale,
   1420             (y3 - srcTop) * scale);
   1421     ctx.stroke();
   1422 }
   1423 
   1424 function interp(A, B, t) {
   1425     return A + (B - A) * t;
   1426 }
   1427 
   1428 function interp_quad_coords(x1, x2, x3, t)
   1429 {
   1430     var ab = interp(x1, x2, t);
   1431     var bc = interp(x2, x3, t);
   1432     var abc = interp(ab, bc, t);
   1433     return abc;
   1434 }
   1435 
   1436 function quadPartial(x1, y1, x2, y2, x3, y3, t1, t2) {
   1437     var ax = interp_quad_coords(x1, x2, x3, t1);
   1438     var ay = interp_quad_coords(y1, y2, y3, t1);
   1439     var dx = interp_quad_coords(x1, x2, x3, (t1 + t2) / 2);
   1440     var dy = interp_quad_coords(y1, y2, y3, (t1 + t2) / 2);
   1441     var cx = interp_quad_coords(x1, x2, x3, t2);
   1442     var cy = interp_quad_coords(y1, y2, y3, t2);
   1443     var bx = 2*dx - (ax + cx)/2;
   1444     var by = 2*dy - (ay + cy)/2;
   1445     var array = [
   1446         ax, ay, bx, by, cx, cy
   1447     ];
   1448     return array;
   1449 }
   1450 
   1451 function drawQuadPartial(x1, y1, x2, y2, x3, y3, t1, t2) {
   1452     var a = quadPartial(x1, y1, x2, y2, x3, y3, t1, t2);
   1453     var ax = a[0];
   1454     var ay = a[1];
   1455     var bx = a[2];
   1456     var by = a[3];
   1457     var cx = a[4];
   1458     var cy = a[5];
   1459     if (alreadyDrawnQuad(ax, ay, bx, by, cx, cy)) {
   1460         return;
   1461     }
   1462     ctx.beginPath();
   1463     ctx.moveTo((ax - srcLeft) * scale,
   1464             (ay - srcTop) * scale);
   1465     ctx.quadraticCurveTo((bx - srcLeft) * scale,
   1466             (by - srcTop) * scale,
   1467             (cx - srcLeft) * scale,
   1468             (cy - srcTop) * scale);
   1469     ctx.stroke();
   1470 }
   1471 
   1472 function alreadyDrawnCubic(x1, y1, x2, y2, x3, y3, x4, y4) {
   1473     if (collect_bounds) {
   1474         if (focus_enabled) {
   1475             focusXmin = Math.min(focusXmin, x1, x2, x3, x4);
   1476             focusYmin = Math.min(focusYmin, y1, y2, y3, y4);
   1477             focusXmax = Math.max(focusXmax, x1, x2, x3, x4);
   1478             focusYmax = Math.max(focusYmax, y1, y2, y3, y4);
   1479         }
   1480         return true;
   1481     }
   1482     for (var pts = 0; pts < drawnCubics.length; pts += 8) {
   1483         if (x1 == drawnCubics[pts] && y1 == drawnCubics[pts + 1]
   1484                 && x2 == drawnCubics[pts + 2] && y2 == drawnCubics[pts + 3] 
   1485                 && x3 == drawnCubics[pts + 4] && y3 == drawnCubics[pts + 5] 
   1486                 && x4 == drawnCubics[pts + 6] && y4 == drawnCubics[pts + 7]) {
   1487             return true;
   1488         }
   1489     }
   1490     drawnCubics.push(x1);
   1491     drawnCubics.push(y1);
   1492     drawnCubics.push(x2);
   1493     drawnCubics.push(y2);
   1494     drawnCubics.push(x3);
   1495     drawnCubics.push(y3);
   1496     drawnCubics.push(x4);
   1497     drawnCubics.push(y4);
   1498     return false;
   1499 }
   1500 
   1501 function drawCubic(x1, y1, x2, y2, x3, y3, x4, y4) {
   1502     if (alreadyDrawnCubic(x1, y1, x2, y2, x3, y3, x4, y4)) {
   1503         return;
   1504     }
   1505     ctx.beginPath();
   1506     ctx.moveTo((x1 - srcLeft) * scale,
   1507             (y1 - srcTop) * scale);
   1508     ctx.bezierCurveTo((x2 - srcLeft) * scale,
   1509             (y2 - srcTop) * scale,
   1510             (x3 - srcLeft) * scale,
   1511             (y3 - srcTop) * scale,
   1512             (x4 - srcLeft) * scale,
   1513             (y4 - srcTop) * scale);
   1514     ctx.stroke();
   1515 }
   1516 
   1517 function interp_cubic_coords(x1, x2, x3, x4, t)
   1518 {
   1519     var ab = interp(x1, x2, t);
   1520     var bc = interp(x2, x3, t);
   1521     var cd = interp(x3, x4, t);
   1522     var abc = interp(ab, bc, t);
   1523     var bcd = interp(bc, cd, t);
   1524     var abcd = interp(abc, bcd, t);
   1525     return abcd;
   1526 }
   1527 
   1528 function cubicPartial(x1, y1, x2, y2, x3, y3, x4, y4, t1, t2) {
   1529     var ax = interp_cubic_coords(x1, x2, x3, x4, t1);
   1530     var ay = interp_cubic_coords(y1, y2, y3, y4, t1);
   1531     var ex = interp_cubic_coords(x1, x2, x3, x4, (t1*2+t2)/3);
   1532     var ey = interp_cubic_coords(y1, y2, y3, y4, (t1*2+t2)/3);
   1533     var fx = interp_cubic_coords(x1, x2, x3, x4, (t1+t2*2)/3);
   1534     var fy = interp_cubic_coords(y1, y2, y3, y4, (t1+t2*2)/3);
   1535     var dx = interp_cubic_coords(x1, x2, x3, x4, t2);
   1536     var dy = interp_cubic_coords(y1, y2, y3, y4, t2);
   1537     var mx = ex * 27 - ax * 8 - dx;
   1538     var my = ey * 27 - ay * 8 - dy;
   1539     var nx = fx * 27 - ax - dx * 8;
   1540     var ny = fy * 27 - ay - dy * 8;
   1541     var bx = (mx * 2 - nx) / 18;
   1542     var by = (my * 2 - ny) / 18;
   1543     var cx = (nx * 2 - mx) / 18;
   1544     var cy = (ny * 2 - my) / 18;
   1545     var array = [
   1546         ax, ay, bx, by, cx, cy, dx, dy
   1547     ];
   1548     return array;
   1549 }
   1550     
   1551 function drawCubicPartial(x1, y1, x2, y2, x3, y3, x4, y4, t1, t2) {
   1552     var a = cubicPartial(x1, y1, x2, y2, x3, y3, x4, y4, t1, t2);
   1553     var ax = a[0];
   1554     var ay = a[1];
   1555     var bx = a[2];
   1556     var by = a[3];
   1557     var cx = a[4];
   1558     var cy = a[5];
   1559     var dx = a[6];
   1560     var dy = a[7];
   1561     if (alreadyDrawnCubic(ax, ay, bx, by, cx, cy, dx, dy)) {
   1562         return;
   1563     }
   1564     ctx.beginPath();
   1565     ctx.moveTo((ax - srcLeft) * scale,
   1566             (ay - srcTop) * scale);
   1567     ctx.bezierCurveTo((bx - srcLeft) * scale,
   1568             (by - srcTop) * scale,
   1569             (cx - srcLeft) * scale,
   1570             (cy - srcTop) * scale,
   1571             (dx - srcLeft) * scale,
   1572             (dy - srcTop) * scale);
   1573     ctx.stroke();
   1574 }
   1575 
   1576 function drawCurve(c) {
   1577     switch (c.length) {
   1578         case 4:
   1579             drawLine(c[0], c[1], c[2], c[3]);
   1580             break;
   1581         case 6:
   1582             drawQuad(c[0], c[1], c[2], c[3], c[4], c[5]);
   1583             break;
   1584         case 8:
   1585             drawCubic(c[0], c[1], c[2], c[3], c[4], c[5], c[6], c[7]);
   1586             break;
   1587     }
   1588 }
   1589 
   1590 function boundsWidth(pts) {
   1591     var min = pts[0];
   1592     var max = pts[0];
   1593     for (var idx = 2; idx < pts.length; idx += 2) {
   1594         min = Math.min(min, pts[idx]);
   1595         max = Math.max(max, pts[idx]);
   1596     }
   1597     return max - min;
   1598 }
   1599 
   1600 function boundsHeight(pts) {
   1601     var min = pts[1];
   1602     var max = pts[1];
   1603     for (var idx = 3; idx < pts.length; idx += 2) {
   1604         min = Math.min(min, pts[idx]);
   1605         max = Math.max(max, pts[idx]);
   1606     }
   1607     return max - min;
   1608 }
   1609 
   1610 function tangent(pts) {
   1611     var dx = pts[2] - pts[0];
   1612     var dy = pts[3] - pts[1];
   1613     if (dx == 0 && dy == 0 && pts.length > 4) {
   1614         dx = pts[4] - pts[0];
   1615         dy = pts[5] - pts[1];
   1616         if (dx == 0 && dy == 0 && pts.length > 6) {
   1617             dx = pts[6] - pts[0];
   1618             dy = pts[7] - pts[1];
   1619         }
   1620     }
   1621     return Math.atan2(-dy, dx);
   1622 }
   1623 
   1624 function hodograph(cubic) {
   1625     var hodo = [];
   1626     hodo[0] = 3 * (cubic[2] - cubic[0]);
   1627     hodo[1] = 3 * (cubic[3] - cubic[1]);
   1628     hodo[2] = 3 * (cubic[4] - cubic[2]);
   1629     hodo[3] = 3 * (cubic[5] - cubic[3]);
   1630     hodo[4] = 3 * (cubic[6] - cubic[4]);
   1631     hodo[5] = 3 * (cubic[7] - cubic[5]);
   1632     return hodo;
   1633 }
   1634 
   1635 function hodograph2(cubic) {
   1636     var quad = hodograph(cubic);
   1637     var hodo = [];
   1638     hodo[0] = 2 * (quad[2] - quad[0]);
   1639     hodo[1] = 2 * (quad[3] - quad[1]);
   1640     hodo[2] = 2 * (quad[4] - quad[2]);
   1641     hodo[3] = 2 * (quad[5] - quad[3]);
   1642     return hodo;
   1643 }
   1644 
   1645 function quadraticRootsReal(A, B, C, s) {
   1646     if (A == 0) {
   1647         if (B == 0) {
   1648             s[0] = 0;
   1649             return C == 0;
   1650         }
   1651         s[0] = -C / B;
   1652         return 1;
   1653     }
   1654     /* normal form: x^2 + px + q = 0 */
   1655     var p = B / (2 * A);
   1656     var q = C / A;
   1657     var p2 = p * p;
   1658     if (p2 < q) {
   1659         return 0;
   1660     }
   1661     var sqrt_D = 0;
   1662     if (p2 > q) {
   1663         sqrt_D = sqrt(p2 - q);
   1664     }
   1665     s[0] = sqrt_D - p;
   1666     s[1] = -sqrt_D - p;
   1667     return 1 + s[0] != s[1];
   1668 }
   1669 
   1670 function add_valid_ts(s, realRoots, t) {
   1671     var foundRoots = 0;
   1672     for (var index = 0; index < realRoots; ++index) {
   1673         var tValue = s[index];
   1674         if (tValue >= 0 && tValue <= 1) {
   1675             for (var idx2 = 0; idx2 < foundRoots; ++idx2) {
   1676                 if (t[idx2] != tValue) {
   1677                     t[foundRoots++] = tValue;
   1678                 }
   1679             }
   1680         }
   1681     }
   1682     return foundRoots;
   1683 }
   1684 
   1685 function quadraticRootsValidT(a, b, c, t) {
   1686     var s = [];
   1687     var realRoots = quadraticRootsReal(A, B, C, s);
   1688     var foundRoots = add_valid_ts(s, realRoots, t);
   1689     return foundRoots != 0;
   1690 }
   1691 
   1692 function find_cubic_inflections(cubic, tValues) {
   1693     var Ax = src[2] - src[0];
   1694     var Ay = src[3] - src[1];
   1695     var Bx = src[4] - 2 * src[2] + src[0];
   1696     var By = src[5] - 2 * src[3] + src[1];
   1697     var Cx = src[6] + 3 * (src[2] - src[4]) - src[0];
   1698     var Cy = src[7] + 3 * (src[3] - src[5]) - src[1];
   1699     return quadraticRootsValidT(Bx * Cy - By * Cx, (Ax * Cy - Ay * Cx),
   1700             Ax * By - Ay * Bx, tValues);
   1701 }
   1702 
   1703 function dxy_at_t(curve, type, t) {
   1704     var dxy = {};
   1705     if (type == PATH_QUAD) {
   1706         var a = t - 1;
   1707         var b = 1 - 2 * t;
   1708         var c = t;
   1709         dxy.x = a * curve[0] + b * curve[2] + c * curve[4];
   1710         dxy.y = a * curve[1] + b * curve[3] + c * curve[5];
   1711     } else if (type == PATH_CUBIC) {
   1712         var one_t = 1 - t;
   1713         var a = curve[0];
   1714         var b = curve[2];
   1715         var c = curve[4];
   1716         var d = curve[6];
   1717         dxy.x = 3 * ((b - a) * one_t * one_t + 2 * (c - b) * t * one_t + (d - c) * t * t);
   1718         a = curve[1];
   1719         b = curve[3];
   1720         c = curve[5];
   1721         d = curve[7];
   1722         dxy.y = 3 * ((b - a) * one_t * one_t + 2 * (c - b) * t * one_t + (d - c) * t * t);
   1723     }
   1724     return dxy;
   1725 }
   1726 
   1727 function drawLabel(num, px, py) {
   1728     ctx.beginPath();
   1729     ctx.arc(px, py, 8, 0, Math.PI*2, true);
   1730     ctx.closePath();
   1731     ctx.strokeStyle = "rgba(0,0,0, 0.4)";
   1732     ctx.lineWidth = num == 0 || num == 3 ? 2 : 1;
   1733     ctx.stroke();
   1734     ctx.fillStyle = "black";
   1735     ctx.font = "normal 10px Arial";
   1736   //  ctx.rotate(0.001);
   1737     ctx.fillText(num, px - 2, py + 3);
   1738   //  ctx.rotate(-0.001);
   1739 }
   1740 
   1741 function drawLabelX(ymin, num, loc) {
   1742     var px = (loc - srcLeft) * scale;
   1743     var py = (ymin - srcTop) * scale - 20;
   1744     drawLabel(num, px, py);
   1745 }
   1746 
   1747 function drawLabelY(xmin, num, loc) {
   1748     var px = (xmin - srcLeft) * scale - 20;
   1749     var py = (loc - srcTop) * scale;
   1750     drawLabel(num, px, py);
   1751 }
   1752 
   1753 function drawHodoOrigin(hx, hy, hMinX, hMinY, hMaxX, hMaxY) {
   1754     ctx.beginPath();
   1755     ctx.moveTo(hx, hy - 100);
   1756     ctx.lineTo(hx, hy);
   1757     ctx.strokeStyle = hMinY < 0 ? "green" : "blue";
   1758     ctx.stroke();
   1759     ctx.beginPath();
   1760     ctx.moveTo(hx, hy);
   1761     ctx.lineTo(hx, hy + 100);
   1762     ctx.strokeStyle = hMaxY > 0 ? "green" : "blue";
   1763     ctx.stroke();
   1764     ctx.beginPath();
   1765     ctx.moveTo(hx - 100, hy);
   1766     ctx.lineTo(hx, hy);
   1767     ctx.strokeStyle = hMinX < 0 ? "green" : "blue";
   1768     ctx.stroke();
   1769     ctx.beginPath();
   1770     ctx.moveTo(hx, hy);
   1771     ctx.lineTo(hx + 100, hy);
   1772     ctx.strokeStyle = hMaxX > 0 ? "green" : "blue";
   1773     ctx.stroke();
   1774 }
   1775 
   1776 function scalexy(x, y, mag) {
   1777     var length = Math.sqrt(x * x + y * y);
   1778     return mag / length;
   1779 }
   1780 
   1781 function drawArrow(x, y, dx, dy) {
   1782     var dscale = scalexy(dx, dy, 1 / scale * 100);
   1783     dx *= dscale;
   1784     dy *= dscale;
   1785     ctx.beginPath();
   1786     ctx.moveTo((x - srcLeft) * scale, (y - srcTop) * scale);
   1787     x += dx;
   1788     y += dy;
   1789     ctx.lineTo((x - srcLeft) * scale, (y - srcTop) * scale);
   1790     dx /= 10;
   1791     dy /= 10;
   1792     ctx.lineTo((x - dy - srcLeft) * scale, (y + dx - srcTop) * scale);
   1793     ctx.lineTo((x + dx * 2 - srcLeft) * scale, (y + dy * 2 - srcTop) * scale);
   1794     ctx.lineTo((x + dy - srcLeft) * scale, (y - dx - srcTop) * scale);
   1795     ctx.lineTo((x - srcLeft) * scale, (y - srcTop) * scale);
   1796     ctx.strokeStyle = "rgba(0,75,0, 0.4)";
   1797     ctx.stroke();
   1798 }
   1799 
   1800 function x_at_t(curve, t) {
   1801     var one_t = 1 - t;
   1802     if (curve.length == 4) {
   1803         return one_t * curve[0] + t * curve[2];
   1804     }
   1805     var one_t2 = one_t * one_t;
   1806     var t2 = t * t;
   1807     if (curve.length == 6) {
   1808         return one_t2 * curve[0] + 2 * one_t * t * curve[2] + t2 * curve[4];
   1809     }
   1810     var a = one_t2 * one_t;
   1811     var b = 3 * one_t2 * t;
   1812     var c = 3 * one_t * t2;
   1813     var d = t2 * t;
   1814     return a * curve[0] + b * curve[2] + c * curve[4] + d * curve[6];
   1815 }
   1816 
   1817 function y_at_t(curve, t) {
   1818     var one_t = 1 - t;
   1819     if (curve.length == 4) {
   1820         return one_t * curve[1] + t * curve[3];
   1821     }
   1822     var one_t2 = one_t * one_t;
   1823     var t2 = t * t;
   1824     if (curve.length == 6) {
   1825         return one_t2 * curve[1] + 2 * one_t * t * curve[3] + t2 * curve[5];
   1826     }
   1827     var a = one_t2 * one_t;
   1828     var b = 3 * one_t2 * t;
   1829     var c = 3 * one_t * t2;
   1830     var d = t2 * t;
   1831     return a * curve[1] + b * curve[3] + c * curve[5] + d * curve[7];
   1832 }
   1833 
   1834 function drawOrder(curve, label) {
   1835     var px = x_at_t(curve, 0.75);
   1836     var py = y_at_t(curve, 0.75);
   1837     var _px = (px - srcLeft) * scale;
   1838     var _py = (py - srcTop) * scale;
   1839     ctx.beginPath();
   1840     ctx.arc(_px, _py, 15, 0, Math.PI * 2, true);
   1841     ctx.closePath();
   1842     ctx.fillStyle = "white";
   1843     ctx.fill();
   1844     if (label == 'L') {
   1845         ctx.strokeStyle = "rgba(255,0,0, 1)";
   1846         ctx.fillStyle = "rgba(255,0,0, 1)";
   1847     } else {
   1848         ctx.strokeStyle = "rgba(0,0,255, 1)";
   1849         ctx.fillStyle = "rgba(0,0,255, 1)";
   1850     }
   1851     ctx.stroke();
   1852     ctx.font = "normal 16px Arial";
   1853     ctx.textAlign = "center";
   1854     ctx.fillText(label, _px, _py + 5);
   1855     ctx.font = "normal 10px Arial";
   1856 }
   1857 
   1858 function drawID(curve, id) {
   1859     var px = x_at_t(curve, 0.5);
   1860     var py = y_at_t(curve, 0.5);
   1861     var _px = (px - srcLeft) * scale;
   1862     var _py = (py - srcTop) * scale;
   1863     draw_id_at(id, _px, _py);
   1864 }
   1865 
   1866 function draw_id_at(id, _px, _py) {
   1867     ctx.beginPath();
   1868     ctx.arc(_px, _py, 15, 0, Math.PI * 2, true);
   1869     ctx.closePath();
   1870     ctx.fillStyle = "white";
   1871     ctx.fill();
   1872     ctx.strokeStyle = "rgba(127,127,0, 1)";
   1873     ctx.fillStyle = "rgba(127,127,0, 1)";
   1874     ctx.stroke();
   1875     ctx.font = "normal 16px Arial";
   1876     ctx.textAlign = "center";
   1877     ctx.fillText(id, _px, _py + 5);
   1878     ctx.font = "normal 10px Arial";
   1879 }
   1880 
   1881 function drawLinePartialID(id, x1, y1, x2, y2, t1, t2) {
   1882     var curve = [x1, y1, x2, y2];
   1883     drawCurvePartialID(id, curve, t1, t2);
   1884 }
   1885 
   1886 function drawQuadPartialID(id, x1, y1, x2, y2, x3, y3, t1, t2) {
   1887     var curve = [x1, y1, x2, y2, x3, y3];
   1888     drawCurvePartialID(id, curve, t1, t2);
   1889 }
   1890 
   1891 function drawCubicPartialID(id, x1, y1, x2, y2, x3, y3, x4, y4, t1, t2) {
   1892     var curve = [x1, y1, x2, y2, x3, y3, x4, y4];
   1893     drawCurvePartialID(id, curve, t1, t2);
   1894 }
   1895 
   1896 function  drawCurvePartialID(id, curve, t1, t2) {
   1897     var px = x_at_t(curve, (t1 + t2) / 2);
   1898     var py = y_at_t(curve, (t1 + t2) / 2);
   1899     var _px = (px - srcLeft) * scale;
   1900     var _py = (py - srcTop) * scale;
   1901     draw_id_at(id, _px, _py);
   1902 }
   1903 
   1904 function drawCurveSpecials(test, curve, type) {
   1905     if (pt_labels) {
   1906         drawPoints(curve, type, pt_labels == 2);
   1907     }
   1908     if (control_lines != 0) {
   1909         drawControlLines(curve, type, control_lines);
   1910     }
   1911     if (curve_t) {
   1912         drawPointAtT(curve, type);
   1913     }
   1914     if (draw_midpoint) {
   1915         var mid = pointAtT(curve, type, 0.5);
   1916         drawPoint(mid.x, mid.y, true);
   1917     }
   1918     if (draw_id) {
   1919         var id = idByCurve(test, curve, type);
   1920         if (id >= 0) {
   1921             drawID(curve, id);
   1922         }
   1923     }
   1924     if (type == PATH_LINE) {
   1925         return;
   1926     }
   1927     if (draw_deriviatives > 0) {
   1928         var d = dxy_at_t(curve, type, 0);
   1929         drawArrow(curve[0], curve[1], d.x, d.y);
   1930         if (draw_deriviatives == 2) {
   1931             d = dxy_at_t(curve, type, 1);
   1932             if (type == PATH_CUBIC) {
   1933                 drawArrow(curve[6], curve[7], d.x, d.y);
   1934             } else {
   1935                 drawArrow(curve[4], curve[5], d.x, d.y);
   1936             }
   1937         }
   1938         if (draw_midpoint) {
   1939             var mid = pointAtT(curve, type, 0.5);
   1940             d = dxy_at_t(curve, type, 0.5);
   1941             drawArrow(mid.x, mid.y, d.x, d.y);
   1942         }
   1943     }
   1944     if (type != PATH_CUBIC) {
   1945         return;
   1946     }
   1947     if (draw_hodo == 1 || draw_hodo == 2) {
   1948         var hodo = hodograph(curve);
   1949         var hMinX = Math.min(0, hodo[0], hodo[2], hodo[4]);
   1950         var hMinY = Math.min(0, hodo[1], hodo[3], hodo[5]);
   1951         var hMaxX = Math.max(0, hodo[0], hodo[2], hodo[4]);
   1952         var hMaxY = Math.max(0, hodo[1], hodo[3], hodo[5]);
   1953         var hScaleX = hMaxX - hMinX > 0 ? screenWidth / (hMaxX - hMinX) : 1;
   1954         var hScaleY = hMaxY - hMinY > 0 ? screenHeight / (hMaxY - hMinY) : 1;
   1955         var hUnit = Math.min(hScaleX, hScaleY);
   1956         hUnit /= 2;
   1957         var hx = xoffset - hMinX * hUnit;
   1958         var hy = yoffset - hMinY * hUnit;
   1959         ctx.moveTo(hx + hodo[0] * hUnit, hy + hodo[1] * hUnit);
   1960         ctx.quadraticCurveTo(
   1961             hx + hodo[2] * hUnit, hy + hodo[3] * hUnit,
   1962             hx + hodo[4] * hUnit, hy + hodo[5] * hUnit);
   1963         ctx.strokeStyle = "red";
   1964         ctx.stroke();
   1965         if (draw_hodo == 1) {
   1966             drawHodoOrigin(hx, hy, hMinX, hMinY, hMaxX, hMaxY);
   1967         }
   1968     }
   1969     if (draw_hodo == 3) {
   1970         var hodo = hodograph2(curve);
   1971         var hMinX = Math.min(0, hodo[0], hodo[2]);
   1972         var hMinY = Math.min(0, hodo[1], hodo[3]);
   1973         var hMaxX = Math.max(0, hodo[0], hodo[2]);
   1974         var hMaxY = Math.max(0, hodo[1], hodo[3]);
   1975         var hScaleX = hMaxX - hMinX > 0 ? screenWidth / (hMaxX - hMinX) : 1;
   1976         var hScaleY = hMaxY - hMinY > 0 ? screenHeight / (hMaxY - hMinY) : 1;
   1977         var hUnit = Math.min(hScaleX, hScaleY);
   1978         hUnit /= 2;
   1979         var hx = xoffset - hMinX * hUnit;
   1980         var hy = yoffset - hMinY * hUnit;
   1981         ctx.moveTo(hx + hodo[0] * hUnit, hy + hodo[1] * hUnit);
   1982         ctx.lineTo(hx + hodo[2] * hUnit, hy + hodo[3] * hUnit);
   1983         ctx.strokeStyle = "red";
   1984         ctx.stroke();
   1985         drawHodoOrigin(hx, hy, hMinX, hMinY, hMaxX, hMaxY);
   1986     }
   1987     if (draw_sequence) {
   1988         var ymin = Math.min(curve[1], curve[3], curve[5], curve[7]);
   1989         for (var i = 0; i < 8; i+= 2) {
   1990             drawLabelX(ymin, i >> 1, curve[i]);
   1991         }
   1992         var xmin = Math.min(curve[0], curve[2], curve[4], curve[6]);
   1993         for (var i = 1; i < 8; i+= 2) {
   1994             drawLabelY(xmin, i >> 1, curve[i]);
   1995         }
   1996     }
   1997 }
   1998 
   1999 function logCurves(test) {
   2000     for (curves in test) {
   2001         var curve = test[curves];
   2002         dumpCurve(curve);
   2003     }
   2004 }
   2005 
   2006 function curveToString(curve) {
   2007     var str = "{{";
   2008     for (i = 0; i < curve.length; i += 2) {
   2009         str += curve[i].toFixed(decimal_places) + "," + curve[i + 1].toFixed(decimal_places);
   2010         if (i < curve.length - 2) {
   2011             str += "}, {";
   2012         }
   2013     }
   2014     str += "}}";
   2015     return str;
   2016 }
   2017 
   2018 function dumpCurve(curve) {
   2019     console.log(curveToString(curve));
   2020 }
   2021 
   2022 function draw(test, lines, title) {
   2023     ctx.fillStyle = "rgba(0,0,0, 0.1)";
   2024     ctx.font = "normal 50px Arial";
   2025     ctx.textAlign = "left";
   2026     ctx.fillText(title, 50, 50);
   2027     ctx.font = "normal 10px Arial";
   2028     ctx.lineWidth = "1.001"; "0.999";
   2029     var secondPath = test.length;
   2030     var closeCount = 0;
   2031     logStart = -1;
   2032     logRange = 0;
   2033     // find last active rec type at this step
   2034     var curType = test[0];
   2035     var curStep = 0;
   2036     var hasOp = false;
   2037     var lastActive = 0;
   2038     var lastAdd = 0;
   2039     var lastSect = 0;
   2040     var lastSort = 0;
   2041     var lastMark = 0;
   2042     activeCount = 0;
   2043     addCount = 0;
   2044     angleCount = 0;
   2045     opCount = 0;
   2046     sectCount = 0;
   2047     sortCount = 0;
   2048     markCount = 0;
   2049     activeMax = 0;
   2050     addMax = 0;
   2051     angleMax = 0;
   2052     opMax = 0;
   2053     sectMax = 0;
   2054     sectMax2 = 0;
   2055     sortMax = 0;
   2056     markMax = 0;
   2057     lastIndex = test.length - 3;
   2058     for (var tIndex = 0; tIndex < test.length; tIndex += 3) {
   2059         var recType = test[tIndex];
   2060         if (!typeof recType == 'number' || recType < REC_TYPE_UNKNOWN || recType > REC_TYPE_LAST) {
   2061             console.log("unknown rec type: " + recType);
   2062             throw "stop execution";
   2063         }
   2064    //     if (curType == recType && curType != REC_TYPE_ADD) {
   2065    //         continue;
   2066    //     }
   2067         var inStepRange = step_limit == 0 || curStep < step_limit;
   2068         curType = recType;
   2069         if (recType == REC_TYPE_OP) {
   2070             hasOp = true;
   2071             continue;
   2072         }
   2073         if (recType == REC_TYPE_UNKNOWN) {
   2074             // these types do not advance step
   2075             continue;
   2076         }
   2077         var bumpStep = false;
   2078         var records = test[tIndex + 2];
   2079         var fragType = records[0];
   2080         if (recType == REC_TYPE_ADD) {
   2081             if (records.length != 2) {
   2082                 console.log("expect only two elements: " + records.length);
   2083                 throw "stop execution";
   2084             }
   2085             if (fragType == ADD_MOVETO || fragType == ADD_CLOSE) {
   2086                 continue;
   2087             }
   2088             ++addMax;
   2089             if (!draw_add || !inStepRange) {
   2090                 continue;
   2091             }
   2092             lastAdd = tIndex;
   2093             ++addCount;
   2094             bumpStep = true;
   2095         }
   2096         if (recType == REC_TYPE_PATH && hasOp) {
   2097             secondPath = tIndex;
   2098         }
   2099         if (recType == REC_TYPE_ACTIVE) {
   2100             ++activeMax;
   2101             if (!draw_active || !inStepRange) {
   2102                 continue;
   2103             }
   2104             lastActive = tIndex;
   2105             ++activeCount;
   2106             bumpStep = true;
   2107         }
   2108         if (recType == REC_TYPE_ACTIVE_OP) {
   2109             ++opMax;
   2110             if (!draw_op || !inStepRange) {
   2111                 continue;
   2112             }
   2113             lastOp = tIndex;
   2114             ++opCount;
   2115             bumpStep = true;
   2116         }
   2117         if (recType == REC_TYPE_ANGLE) {
   2118             ++angleMax;
   2119             if (!draw_angle || !inStepRange) {
   2120                 continue;
   2121             }
   2122             lastAngle = tIndex;
   2123             ++angleCount;
   2124             bumpStep = true;
   2125         }
   2126         if (recType == REC_TYPE_SECT) {
   2127             if (records.length != 2) {
   2128                 console.log("expect only two elements: " + records.length);
   2129                 throw "stop execution";
   2130             }
   2131             ++sectMax;
   2132             var sectBump = 1;
   2133             switch (fragType) {
   2134                 case INTERSECT_LINE:
   2135                 case INTERSECT_QUAD_LINE:
   2136                 case INTERSECT_QUAD:
   2137                 case INTERSECT_SELF_CUBIC:
   2138                 case INTERSECT_CUBIC_LINE:
   2139                 case INTERSECT_CUBIC_QUAD:
   2140                 case INTERSECT_CUBIC:
   2141                     sectBump = 1;
   2142                     break;
   2143                 case INTERSECT_LINE_2:
   2144                 case INTERSECT_QUAD_LINE_2:
   2145                 case INTERSECT_QUAD_2:
   2146                 case INTERSECT_CUBIC_LINE_2:
   2147                 case INTERSECT_CUBIC_QUAD_2:
   2148                 case INTERSECT_CUBIC_2:
   2149                     sectBump = 2;
   2150                     break;
   2151                 case INTERSECT_LINE_NO:
   2152                 case INTERSECT_QUAD_LINE_NO:
   2153                 case INTERSECT_QUAD_NO:
   2154                 case INTERSECT_SELF_CUBIC_NO:
   2155                 case INTERSECT_CUBIC_LINE_NO:
   2156                 case INTERSECT_CUBIC_QUAD_NO:
   2157                 case INTERSECT_CUBIC_NO:
   2158                     sectBump = 0;
   2159                     break;
   2160                 case INTERSECT_CUBIC_LINE_3:
   2161                 case INTERSECT_CUBIC_QUAD_3:
   2162                 case INTERSECT_CUBIC_3:
   2163                     sectBump = 3;
   2164                     break;
   2165                 case INTERSECT_CUBIC_QUAD_4:
   2166                 case INTERSECT_CUBIC_4:
   2167                     sectBump = 4;
   2168                     break;
   2169                 default:
   2170                     console.log("missing case " + records.length);
   2171                     throw "stop execution";
   2172             }
   2173             sectMax2 += sectBump;
   2174             if (draw_intersection <= 1 || !inStepRange) {
   2175                 continue;
   2176             }
   2177             lastSect = tIndex;
   2178             sectCount += sectBump;
   2179             bumpStep = true;
   2180         }
   2181         if (recType == REC_TYPE_SORT) {
   2182             ++sortMax;
   2183             if (!draw_sort || !inStepRange) {
   2184                 continue;
   2185             }
   2186             lastSort = tIndex;
   2187             ++sortCount;
   2188             bumpStep = true;
   2189         }
   2190         if (recType == REC_TYPE_MARK) {
   2191             ++markMax;
   2192             if (!draw_mark || !inStepRange) {
   2193                 continue;
   2194             }
   2195             lastMark = tIndex;
   2196             ++markCount;
   2197             bumpStep = true;
   2198         }
   2199         if (bumpStep) {
   2200             lastIndex = tIndex;
   2201             logStart = test[tIndex + 1];
   2202             logRange = records.length / 2;
   2203             ++curStep;
   2204         }
   2205     }
   2206     stepMax = (draw_add ? addMax : 0)
   2207             + (draw_active ? activeMax : 0)
   2208             + (draw_op ? opMax : 0)
   2209             + (draw_angle ? angleMax : 0)
   2210             + (draw_sort ? sortMax : 0)
   2211             + (draw_mark ? markMax : 0)
   2212             + (draw_intersection == 2 ? sectMax : draw_intersection == 3 ? sectMax2 : 0);
   2213     if (stepMax == 0) {
   2214         stepMax = addMax + activeMax + angleMax + opMax + sortMax + markMax;
   2215     }
   2216     drawnPts = [];
   2217     drawnLines = [];
   2218     drawnQuads = [];
   2219     drawnCubics = [];
   2220     focusXmin = focusYmin = Infinity;
   2221     focusXmax = focusYmax = -Infinity;
   2222     var pathIndex = 0;
   2223     var opLetter = 'S';
   2224     for (var tIndex = lastIndex; tIndex >= 0; tIndex -= 3) {
   2225         var recType = test[tIndex];
   2226         var records = test[tIndex + 2];
   2227         for (var recordIndex = 0; recordIndex < records.length; recordIndex += 2) {
   2228             var fragType = records[recordIndex];
   2229             if (!typeof fragType == 'number' || fragType < 1 || fragType > FRAG_TYPE_LAST) {
   2230                 console.log("unknown in range frag type: " + fragType);
   2231                 throw "stop execution";
   2232             }
   2233             var frags = records[recordIndex + 1];
   2234             focus_enabled = false;
   2235             switch (recType) {
   2236                 case REC_TYPE_COMPUTED:
   2237                     if (draw_computed == 0) {
   2238                         continue;
   2239                     }
   2240                     ctx.lineWidth = 1;
   2241                     ctx.strokeStyle = pathIndex == 0 ? "black" : "red";
   2242                     ctx.fillStyle = "blue";
   2243                     var drawThis = false;
   2244                     switch (fragType) {
   2245                         case PATH_QUAD:
   2246                             if ((draw_computed & 5) == 1 || ((draw_computed & 4) != 0
   2247                                     && (draw_computed & 1) == pathIndex)) {
   2248                                 drawQuad(frags[0], frags[1], frags[2], frags[3],
   2249                                         frags[4], frags[5]);
   2250                                 drawThis = true;
   2251                             }
   2252                             break;
   2253                         case PATH_CUBIC:
   2254                             if ((draw_computed & 6) == 2 || ((draw_computed & 4) != 0
   2255                                      && (draw_computed & 1) != pathIndex)) {
   2256                                 drawCubic(frags[0], frags[1], frags[2], frags[3],
   2257                                         frags[4], frags[5], frags[6], frags[7]);
   2258                                 drawThis = true;
   2259                             }
   2260                             ++pathIndex;
   2261                             break;
   2262                         case COMPUTED_SET_1:
   2263                             pathIndex = 0;
   2264                             break;
   2265                         case COMPUTED_SET_2:
   2266                             pathIndex = 1;
   2267                             break;
   2268                         default:
   2269                             console.log("unknown REC_TYPE_COMPUTED frag type: " + fragType);
   2270                             throw "stop execution";
   2271                     }
   2272                     if (!drawThis || collect_bounds) {
   2273                         break;
   2274                     }
   2275                     drawCurveSpecials(test, frags, fragType);
   2276                     break;
   2277                 case REC_TYPE_PATH:
   2278                     if (!draw_path) {
   2279                         continue;
   2280                     }
   2281                     var firstPath = tIndex < secondPath;
   2282                     if ((draw_path & (firstPath ? 1 : 2)) == 0) {
   2283                         continue;
   2284                     }
   2285                     ctx.lineWidth = 1;
   2286                     ctx.strokeStyle = firstPath ? "black" : "red";
   2287                     ctx.fillStyle = "blue";
   2288                     switch (fragType) {
   2289                         case PATH_LINE:
   2290                             drawLine(frags[0], frags[1], frags[2], frags[3]);
   2291                             break;
   2292                         case PATH_QUAD:
   2293                             drawQuad(frags[0], frags[1], frags[2], frags[3],
   2294                                     frags[4], frags[5]);
   2295                             break;
   2296                         case PATH_CUBIC:
   2297                             drawCubic(frags[0], frags[1], frags[2], frags[3],
   2298                                     frags[4], frags[5], frags[6], frags[7]);
   2299                             break;
   2300                         default:
   2301                             console.log("unknown REC_TYPE_PATH frag type: " + fragType);
   2302                             throw "stop execution";
   2303                     }
   2304                     if (collect_bounds) {
   2305                         break;
   2306                     }
   2307                     drawCurveSpecials(test, frags, fragType);
   2308                     break;
   2309                 case REC_TYPE_OP:
   2310                     switch (fragType) {
   2311                         case OP_INTERSECT: opLetter = 'I'; break;
   2312                         case OP_DIFFERENCE: opLetter = 'D'; break;
   2313                         case OP_UNION: opLetter = 'U'; break;
   2314                         case OP_XOR: opLetter = 'X'; break;
   2315                         default:
   2316                             console.log("unknown REC_TYPE_OP frag type: " + fragType);
   2317                             throw "stop execution";
   2318                     }
   2319                     break;
   2320                 case REC_TYPE_ACTIVE:
   2321                     if (!draw_active || (step_limit > 0 && tIndex < lastActive)) {
   2322                         continue;
   2323                     }
   2324                     var x1 = frags[SPAN_X1];
   2325                     var y1 = frags[SPAN_Y1];
   2326                     var x2 = frags[SPAN_X2];
   2327                     var y2 = frags[SPAN_Y2];
   2328                     var x3, y3, x3, y4, t1, t2;
   2329                     ctx.lineWidth = 3;
   2330                     ctx.strokeStyle = "rgba(0,0,255, 0.3)";
   2331                     focus_enabled = true;
   2332                     switch (fragType) {
   2333                         case ACTIVE_LINE_SPAN:
   2334                             t1 = frags[SPAN_L_T];
   2335                             t2 = frags[SPAN_L_TEND];
   2336                             drawLinePartial(x1, y1, x2, y2, t1, t2);
   2337                             if (draw_id) {
   2338                                 drawLinePartialID(frags[0], x1, y1, x2, y2, t1, t2);
   2339                             }
   2340                              break;
   2341                         case ACTIVE_QUAD_SPAN:
   2342                             x3 = frags[SPAN_X3];
   2343                             y3 = frags[SPAN_Y3];
   2344                             t1 = frags[SPAN_Q_T];
   2345                             t2 = frags[SPAN_Q_TEND];
   2346                             drawQuadPartial(x1, y1, x2, y2, x3, y3, t1, t2);
   2347                             if (draw_id) {
   2348                                 drawQuadPartialID(frags[0], x1, y1, x2, y2, x3, y3, t1, t2);
   2349                             }
   2350                             break;
   2351                         case ACTIVE_CUBIC_SPAN:
   2352                             x3 = frags[SPAN_X3];
   2353                             y3 = frags[SPAN_Y3];
   2354                             x4 = frags[SPAN_X4];
   2355                             y4 = frags[SPAN_Y4];
   2356                             t1 = frags[SPAN_C_T];
   2357                             t2 = frags[SPAN_C_TEND];
   2358                             drawCubicPartial(x1, y1, x2, y2, x3, y3, x4, y4, t1, t2);
   2359                             if (draw_id) {
   2360                                 drawCubicPartialID(frags[0], x1, y1, x2, y2, x3, y3, x4, y4, t1, t2);
   2361                             }
   2362                             break;
   2363                         default:
   2364                             console.log("unknown REC_TYPE_ACTIVE frag type: " + fragType);
   2365                             throw "stop execution";
   2366                     }
   2367                     break;
   2368                 case REC_TYPE_ACTIVE_OP:
   2369                     if (!draw_op || (step_limit > 0 && tIndex < lastOp)) {
   2370                         continue;
   2371                     }
   2372                     focus_enabled = true;
   2373                     ctx.lineWidth = 3;
   2374                     var activeSpan = frags[7] == "1";
   2375                     ctx.strokeStyle = activeSpan ? "rgba(45,160,0, 0.3)" : "rgba(255,45,0, 0.5)";
   2376                     var curve = curvePartialByID(test, frags[0], frags[1], frags[2]);
   2377                     drawCurve(curve);
   2378                     if (draw_op > 1) {
   2379                         drawArc(curve, false, frags[3], frags[4]);
   2380                         drawArc(curve, true, frags[5], frags[6]);
   2381                     }
   2382                     break;
   2383                 case REC_TYPE_ADD:
   2384                     if (!draw_add) {
   2385                         continue;
   2386                     }
   2387                     ctx.lineWidth = 3;
   2388                     ctx.strokeStyle = closeCount == 0 ? "rgba(0,0,255, 0.3)"
   2389                             : closeCount == 1 ? "rgba(0,127,0, 0.3)"
   2390                             : closeCount == 2 ? "rgba(0,127,127, 0.3)"
   2391                             : closeCount == 3 ? "rgba(127,127,0, 0.3)"
   2392                             : "rgba(127,0,127, 0.3)";
   2393                     focus_enabled = true;
   2394                     switch (fragType) {
   2395                         case ADD_MOVETO:
   2396                             break;
   2397                         case ADD_LINETO:
   2398                             if (step_limit == 0 || tIndex >= lastAdd) {
   2399                                 drawLine(frags[0], frags[1], frags[2], frags[3]);
   2400                             }
   2401                             break;
   2402                         case ADD_QUADTO:
   2403                             if (step_limit == 0 || tIndex >= lastAdd) {
   2404                                 drawQuad(frags[0], frags[1], frags[2], frags[3], frags[4], frags[5]);
   2405                             }
   2406                             break;
   2407                         case ADD_CUBICTO:
   2408                             if (step_limit == 0 || tIndex >= lastAdd) {
   2409                                 drawCubic(frags[0], frags[1], frags[2], frags[3],
   2410                                         frags[4], frags[5], frags[6], frags[7]);
   2411                             }
   2412                             break;
   2413                         case ADD_CLOSE:
   2414                             ++closeCount;
   2415                             break;
   2416                         case ADD_FILL:
   2417                             break;
   2418                         default:
   2419                             console.log("unknown REC_TYPE_ADD frag type: " + fragType);
   2420                             throw "stop execution";
   2421                     }
   2422                     break;
   2423                 case REC_TYPE_ANGLE:
   2424                     if (!draw_angle || (step_limit > 0 && tIndex < lastAngle)) {
   2425                         continue;
   2426                     }
   2427                     if (fragType != ANGLE_AFTER && fragType != ANGLE_AFTER2) {
   2428                         continue;
   2429                     }
   2430                     focus_enabled = true;
   2431                     ctx.lineWidth = 3;
   2432                     ctx.strokeStyle = "rgba(127,45,127, 0.3)";
   2433                     var leftCurve, midCurve, rightCurve;
   2434                     if (fragType == ANGLE_AFTER) {
   2435                         leftCurve = curvePartialByID(test, frags[0], frags[3], frags[4]);
   2436                         midCurve = curvePartialByID(test, frags[5], frags[8], frags[9]);
   2437                         rightCurve = curvePartialByID(test, frags[10], frags[13], frags[14]);
   2438                     } else {
   2439                         leftCurve = curvePartialByID(test, frags[0], frags[4], frags[5]);
   2440                         midCurve = curvePartialByID(test, frags[6], frags[10], frags[11]);
   2441                         rightCurve = curvePartialByID(test, frags[12], frags[16], frags[17]);
   2442                     }
   2443                     drawCurve(leftCurve);
   2444                     drawCurve(rightCurve);
   2445                     var inBetween = frags[fragType == ANGLE_AFTER ? 15 : 18] == "T";
   2446                     ctx.strokeStyle = inBetween ? "rgba(0,160,45, 0.3)" : "rgba(255,0,45, 0.5)";
   2447                     drawCurve(midCurve);
   2448                     if (draw_angle > 1) {
   2449                         drawOrder(leftCurve, 'L');
   2450                         drawOrder(rightCurve, 'R');
   2451                     }
   2452                     break;
   2453                 case REC_TYPE_SECT:
   2454                     if (!draw_intersection) {
   2455                         continue;
   2456                     }
   2457                     if (draw_intersection != 1 && (step_limit > 0 && tIndex < lastSect)) {
   2458                         continue;
   2459                     }
   2460                     // draw_intersection == 1 : show all
   2461                     // draw_intersection == 2 : step == 0 ? show all : show intersection line #step
   2462                     // draw_intersection == 3 : step == 0 ? show all : show intersection #step
   2463                     ctx.lineWidth = 1;
   2464                     ctx.strokeStyle = "rgba(0,0,255, 0.3)";
   2465                     ctx.fillStyle = "blue";
   2466                     focus_enabled = true;
   2467                     var f = [];
   2468                     var c1s;
   2469                     var c1l;
   2470                     var c2s;
   2471                     var c2l;
   2472                     switch (fragType) {
   2473                         case INTERSECT_LINE:
   2474                             f.push(5, 6, 0, 7);
   2475                             c1s = 1; c1l = 4; c2s = 8; c2l = 4;
   2476                             break;
   2477                         case INTERSECT_LINE_2:
   2478                             f.push(5, 6, 0, 10);
   2479                             f.push(8, 9, 7, 15);
   2480                             c1s = 1; c1l = 4; c2s = 11; c2l = 4;
   2481                             break;
   2482                         case INTERSECT_LINE_NO:
   2483                             c1s = 0; c1l = 4; c2s = 4; c2l = 4;
   2484                             break;
   2485                         case INTERSECT_QUAD_LINE:
   2486                             f.push(7, 8, 0, 9);
   2487                             c1s = 1; c1l = 6; c2s = 10; c2l = 4;
   2488                             break;
   2489                         case INTERSECT_QUAD_LINE_2:
   2490                             f.push(7, 8, 0, 12);
   2491                             f.push(10, 11, 9, 17);
   2492                             c1s = 1; c1l = 6; c2s = 13; c2l = 4;
   2493                             break;
   2494                         case INTERSECT_QUAD_LINE_NO:
   2495                             c1s = 0; c1l = 6; c2s = 6; c2l = 4;
   2496                             break;
   2497                         case INTERSECT_QUAD:
   2498                             f.push(7, 8, 0, 9);
   2499                             c1s = 1; c1l = 6; c2s = 10; c2l = 6;
   2500                             break;
   2501                         case INTERSECT_QUAD_2:
   2502                             f.push(7, 8, 0, 12);
   2503                             f.push(10, 11, 9, 19);
   2504                             c1s = 1; c1l = 6; c2s = 13; c2l = 6;
   2505                             break;
   2506                         case INTERSECT_QUAD_NO:
   2507                             c1s = 0; c1l = 6; c2s = 6; c2l = 6;
   2508                             break;
   2509                         case INTERSECT_SELF_CUBIC:
   2510                             f.push(9, 10, 0, 11);
   2511                             c1s = 1; c1l = 8; c2s = 0; c2l = 0;
   2512                             break;
   2513                         case INTERSECT_SELF_CUBIC_NO:
   2514                             c1s = 0; c1l = 8; c2s = 0; c2l = 0;
   2515                             break;
   2516                         case INTERSECT_CUBIC_LINE:
   2517                             f.push(9, 10, 0, 11);
   2518                             c1s = 1; c1l = 8; c2s = 12; c2l = 4;
   2519                             break;
   2520                         case INTERSECT_CUBIC_LINE_2:
   2521                             f.push(9, 10, 0, 14);
   2522                             f.push(12, 13, 11, 19);
   2523                             c1s = 1; c1l = 8; c2s = 15; c2l = 4;
   2524                             break;
   2525                         case INTERSECT_CUBIC_LINE_3:
   2526                             f.push(9, 10, 0, 17);
   2527                             f.push(12, 13, 11, 22);
   2528                             f.push(15, 16, 14, 23);
   2529                             c1s = 1; c1l = 8; c2s = 18; c2l = 4;
   2530                             break;
   2531                         case INTERSECT_CUBIC_QUAD_NO:
   2532                             c1s = 0; c1l = 8; c2s = 8; c2l = 6;
   2533                             break;
   2534                         case INTERSECT_CUBIC_QUAD:
   2535                             f.push(9, 10, 0, 11);
   2536                             c1s = 1; c1l = 8; c2s = 12; c2l = 6;
   2537                             break;
   2538                         case INTERSECT_CUBIC_QUAD_2:
   2539                             f.push(9, 10, 0, 14);
   2540                             f.push(12, 13, 11, 21);
   2541                             c1s = 1; c1l = 8; c2s = 15; c2l = 6;
   2542                             break;
   2543                         case INTERSECT_CUBIC_QUAD_3:
   2544                             f.push(9, 10, 0, 17);
   2545                             f.push(12, 13, 11, 24);
   2546                             f.push(15, 16, 14, 25);
   2547                             c1s = 1; c1l = 8; c2s = 18; c2l = 6;
   2548                             break;
   2549                         case INTERSECT_CUBIC_QUAD_4:
   2550                             f.push(9, 10, 0, 20);
   2551                             f.push(12, 13, 11, 27);
   2552                             f.push(15, 16, 14, 28);
   2553                             f.push(18, 19, 17, 29);
   2554                             c1s = 1; c1l = 8; c2s = 21; c2l = 6;
   2555                             break;
   2556                         case INTERSECT_CUBIC_LINE_NO:
   2557                             c1s = 0; c1l = 8; c2s = 8; c2l = 4;
   2558                             break;
   2559                         case INTERSECT_CUBIC:
   2560                             f.push(9, 10, 0, 11);
   2561                             c1s = 1; c1l = 8; c2s = 12; c2l = 8;
   2562                             break;
   2563                         case INTERSECT_CUBIC_2:
   2564                             f.push(9, 10, 0, 14);
   2565                             f.push(12, 13, 11, 23);
   2566                             c1s = 1; c1l = 8; c2s = 15; c2l = 8;
   2567                             break;
   2568                         case INTERSECT_CUBIC_3:
   2569                             f.push(9, 10, 0, 17);
   2570                             f.push(12, 13, 11, 26);
   2571                             f.push(15, 16, 14, 27);
   2572                             c1s = 1; c1l = 8; c2s = 18; c2l = 8;
   2573                             break;
   2574                         case INTERSECT_CUBIC_4:
   2575                             f.push(9, 10, 0, 20);
   2576                             f.push(12, 13, 11, 29);
   2577                             f.push(15, 16, 14, 30);
   2578                             f.push(18, 19, 17, 31);
   2579                             c1s = 1; c1l = 8; c2s = 21; c2l = 8;
   2580                             break;
   2581                         case INTERSECT_CUBIC_NO:
   2582                             c1s = 0; c1l = 8; c2s = 8; c2l = 8;
   2583                             break;
   2584                         default:
   2585                             console.log("unknown REC_TYPE_SECT frag type: " + fragType);
   2586                             throw "stop execution";
   2587                     }
   2588                     if (draw_intersection != 1) {
   2589                         var id = -1;
   2590                         var curve;
   2591                         switch (c1l) {
   2592                             case 4: 
   2593                                 drawLine(frags[c1s], frags[c1s + 1], frags[c1s + 2], frags[c1s + 3]);
   2594                                 if (draw_id) {
   2595                                     curve = [frags[c1s], frags[c1s + 1], frags[c1s + 2], frags[c1s + 3]];
   2596                                     id = idByCurve(test, curve, PATH_LINE);
   2597                                 }
   2598                                 break;
   2599                             case 6:
   2600                                 drawQuad(frags[c1s], frags[c1s + 1], frags[c1s + 2], frags[c1s + 3],
   2601                                         frags[c1s + 4], frags[c1s + 5]);
   2602                                 if (draw_id) {
   2603                                     curve = [frags[c1s], frags[c1s + 1], frags[c1s + 2], frags[c1s + 3],
   2604                                             frags[c1s + 4], frags[c1s + 5]];
   2605                                     id = idByCurve(test, curve, PATH_QUAD);
   2606                                 }
   2607                                 break;
   2608                             case 8:
   2609                                 drawCubic(frags[c1s], frags[c1s + 1], frags[c1s + 2], frags[c1s + 3],
   2610                                         frags[c1s + 4], frags[c1s + 5], frags[c1s + 6], frags[c1s + 7]);
   2611                                 if (draw_id) {
   2612                                     curve = [frags[c1s], frags[c1s + 1], frags[c1s + 2], frags[c1s + 3],
   2613                                             frags[c1s + 4], frags[c1s + 5], frags[c1s + 6], frags[c1s + 7]];
   2614                                     id = idByCurve(test, curve, PATH_CUBIC);
   2615                                 }
   2616                                 break;
   2617                         }
   2618                         if (id >= 0) {
   2619                             drawID(curve, id);
   2620                         }
   2621                         id = -1;
   2622                         switch (c2l) {
   2623                             case 0:
   2624                                 break;
   2625                             case 4: 
   2626                                 drawLine(frags[c2s], frags[c2s + 1], frags[c2s + 2], frags[c2s + 3]);
   2627                                 if (draw_id) {
   2628                                     curve = [frags[c2s], frags[c2s + 1], frags[c2s + 2], frags[c2s + 3]];
   2629                                     id = idByCurve(test, curve, PATH_LINE);
   2630                                 }
   2631                                 break;
   2632                             case 6:
   2633                                 drawQuad(frags[c2s], frags[c2s + 1], frags[c2s + 2], frags[c2s + 3],
   2634                                         frags[c2s + 4], frags[c2s + 5]);
   2635                                 if (draw_id) {
   2636                                     curve = [frags[c2s], frags[c2s + 1], frags[c2s + 2], frags[c2s + 3],
   2637                                             frags[c2s + 4], frags[c2s + 5]];
   2638                                     id = idByCurve(test, curve, PATH_QUAD);
   2639                                 }
   2640                                 break;
   2641                             case 8:
   2642                                 drawCubic(frags[c2s], frags[c2s + 1], frags[c2s + 2], frags[c2s + 3],
   2643                                         frags[c2s + 4], frags[c2s + 5], frags[c2s + 6], frags[c2s + 7]);
   2644                                 if (draw_id) {
   2645                                     curve = [frags[c2s], frags[c2s + 1], frags[c2s + 2], frags[c2s + 3],
   2646                                             frags[c2s + 4], frags[c2s + 5], frags[c2s + 6], frags[c2s + 7]];
   2647                                     id = idByCurve(test, curve, PATH_CUBIC);
   2648                                 }
   2649                                 break;
   2650                         }
   2651                         if (id >= 0) {
   2652                             drawID(curve, id);
   2653                         }
   2654                     }
   2655                     if (collect_bounds) {
   2656                         break;
   2657                     }
   2658                     for (var idx = 0; idx < f.length; idx += 4) {
   2659                         if (draw_intersection != 3 || idx == lastSect - tIndex) {
   2660                             drawPoint(frags[f[idx]], frags[f[idx + 1]], true);
   2661                         }
   2662                     }
   2663                     if (!draw_intersectT) {
   2664                         break;
   2665                     }
   2666                     ctx.fillStyle = "red";
   2667                     for (var idx = 0; idx < f.length; idx += 4) {
   2668                         if (draw_intersection != 3 || idx == lastSect - tIndex) {
   2669                             drawTAtPointUp(frags[f[idx]], frags[f[idx + 1]], frags[f[idx + 2]]);
   2670                             drawTAtPointDown(frags[f[idx]], frags[f[idx + 1]], frags[f[idx + 3]]);
   2671                         }
   2672                     }
   2673                     break;
   2674                 case REC_TYPE_SORT:
   2675                     if (!draw_sort || (step_limit > 0 && tIndex < lastSort)) {
   2676                         continue;
   2677                     }
   2678                     ctx.lineWidth = 3;
   2679                     ctx.strokeStyle = "rgba(127,127,0, 0.5)";
   2680                     focus_enabled = true;
   2681                     switch (fragType) {
   2682                         case SORT_UNARY:
   2683                         case SORT_BINARY:
   2684                             var curve = curvePartialByID(test, frags[0], frags[6], frags[8]);
   2685                             drawCurve(curve);
   2686                             break;
   2687                         default:
   2688                             console.log("unknown REC_TYPE_SORT frag type: " + fragType);
   2689                             throw "stop execution";
   2690                     }
   2691                     break;
   2692                 case REC_TYPE_MARK:
   2693                     if (!draw_mark || (step_limit > 0 && tIndex < lastMark)) {
   2694                         continue;
   2695                     }
   2696                     ctx.lineWidth = 3;
   2697                     ctx.strokeStyle = fragType >= MARK_DONE_LINE ?
   2698                             "rgba(127,0,127, 0.5)" : "rgba(127,127,0, 0.5)";
   2699                     focus_enabled = true;
   2700                     switch (fragType) {
   2701                         case MARK_LINE:
   2702                         case MARK_DONE_LINE:
   2703                         case MARK_UNSORTABLE_LINE:
   2704                         case MARK_SIMPLE_LINE:
   2705                         case MARK_SIMPLE_DONE_LINE:
   2706                         case MARK_DONE_UNARY_LINE:
   2707                             drawLinePartial(frags[1], frags[2], frags[3], frags[4],
   2708                                 frags[5], frags[9]);
   2709                             if (draw_id) {
   2710                                 drawLinePartialID(frags[0], frags[1], frags[2], frags[3], frags[4],
   2711                                 frags[5], frags[9]);
   2712                             }
   2713                             break;
   2714                         case MARK_QUAD:
   2715                         case MARK_DONE_QUAD:
   2716                         case MARK_UNSORTABLE_QUAD:
   2717                         case MARK_SIMPLE_QUAD:
   2718                         case MARK_SIMPLE_DONE_QUAD:
   2719                         case MARK_DONE_UNARY_QUAD:
   2720                             drawQuadPartial(frags[1], frags[2], frags[3], frags[4],
   2721                                 frags[5], frags[6], frags[7], frags[11]);
   2722                             if (draw_id) {
   2723                                 drawQuadPartialID(frags[0], frags[1], frags[2], frags[3], frags[4],
   2724                                 frags[5], frags[6], frags[7], frags[11]);
   2725                             }
   2726                             break;
   2727                         case MARK_CUBIC:
   2728                         case MARK_DONE_CUBIC:
   2729                         case MARK_UNSORTABLE_CUBIC:
   2730                         case MARK_SIMPLE_CUBIC:
   2731                         case MARK_SIMPLE_DONE_CUBIC:
   2732                         case MARK_DONE_UNARY_CUBIC:
   2733                             drawCubicPartial(frags[1], frags[2], frags[3], frags[4],
   2734                                 frags[5], frags[6], frags[7], frags[8], frags[9], frags[13]);
   2735                             if (draw_id) {
   2736                                 drawCubicPartialID(frags[0], frags[1], frags[2], frags[3], frags[4],
   2737                                 frags[5], frags[6], frags[7], frags[8], frags[9], frags[13]);
   2738                             }
   2739                             break;
   2740                         case MARK_ANGLE_LAST:
   2741                             // FIXME: ignored for now
   2742                             break;
   2743                         default:
   2744                             console.log("unknown REC_TYPE_MARK frag type: " + fragType);
   2745                             throw "stop execution";
   2746                     }
   2747                     break;
   2748                 default:
   2749                     continue;
   2750             }
   2751         }
   2752         switch (recType) {
   2753             case REC_TYPE_SORT:
   2754                 if (!draw_sort || (step_limit > 0 && tIndex < lastSort)) {
   2755                     break;
   2756                 }
   2757                 var angles = []; // use tangent lines to describe arcs
   2758                 var windFrom = [];
   2759                 var windTo = [];
   2760                 var opp = [];
   2761                 var minXY = Number.MAX_VALUE;
   2762                 var partial;
   2763                 focus_enabled = true;
   2764                 var someUnsortable = false;
   2765                 for (var recordIndex = 0; recordIndex < records.length; recordIndex += 2) {
   2766                     var fragType = records[recordIndex];
   2767                     var frags = records[recordIndex + 1];
   2768                     var unsortable = (fragType == SORT_UNARY && frags[14]) ||
   2769                             (fragType == SORT_BINARY && frags[16]);
   2770                     someUnsortable |= unsortable;
   2771                     switch (fragType) {
   2772                         case SORT_UNARY:
   2773                         case SORT_BINARY:
   2774                             partial = curvePartialByID(test, frags[0], frags[6], frags[8]);
   2775                             break;
   2776                         default:
   2777                             console.log("unknown REC_TYPE_SORT frag type: " + fragType);
   2778                             throw "stop execution";
   2779                     }
   2780                     var dx = boundsWidth(partial);
   2781                     var dy = boundsHeight(partial);
   2782                     minXY = Math.min(minXY, dx * dx + dy * dy);
   2783                     if (collect_bounds) {
   2784                         continue;
   2785                     }
   2786                     angles.push(tangent(partial));
   2787                     var from = frags[12];
   2788                     var to = frags[12];
   2789                     var sgn = frags[10];
   2790                     if (sgn < 0) {
   2791                         from -= frags[11];
   2792                     } else if (sgn > 0) {
   2793                         to -= frags[11];
   2794                     }
   2795                     windFrom.push(from + (unsortable ? "!" : ""));
   2796                     windTo.push(to + (unsortable ? "!" : ""));
   2797                     opp.push(fragType == SORT_BINARY);
   2798                     if (draw_sort == 1) {
   2799                         drawOrder(partial, frags[12]);
   2800                     } else {
   2801                         drawOrder(partial, (recordIndex / 2) + 1);
   2802                     }
   2803                 }
   2804                 var radius = Math.sqrt(minXY) / 2 * scale;
   2805                 radius = Math.min(50, radius);
   2806                 var scaledRadius = radius / scale;
   2807                 var centerX = partial[0];
   2808                 var centerY = partial[1];
   2809                 if (collect_bounds) {
   2810                     if (focus_enabled) {
   2811                         focusXmin = Math.min(focusXmin, centerX - scaledRadius);
   2812                         focusYmin = Math.min(focusYmin, centerY - scaledRadius);
   2813                         focusXmax = Math.max(focusXmax, centerX + scaledRadius);
   2814                         focusYmax = Math.max(focusYmax, centerY + scaledRadius);
   2815                     }
   2816                     break;
   2817                 }
   2818                 break;
   2819             default:
   2820                 break;
   2821         }
   2822     }
   2823     if (collect_bounds) {
   2824         return;
   2825     }
   2826     if (draw_log && logStart >= 0) {
   2827         ctx.font = "normal 10px Arial";
   2828         ctx.textAlign = "left";
   2829         ctx.beginPath();
   2830         var top = screenHeight - 20 - (logRange + 2) * 10;
   2831         ctx.rect(50, top, screenWidth - 100, (logRange + 2) * 10);
   2832         ctx.fillStyle = "white";
   2833         ctx.fill();
   2834         ctx.fillStyle = "rgba(0,0,0, 0.5)";
   2835         if (logStart > 0) {
   2836             ctx.fillText(lines[logStart - 1], 50, top + 8);
   2837         }
   2838         ctx.fillStyle = "black";
   2839         for (var idx = 0; idx < logRange; ++idx) {
   2840             ctx.fillText(lines[logStart + idx], 50, top + 18 + 10 * idx);
   2841         }
   2842         ctx.fillStyle = "rgba(0,0,0, 0.5)";
   2843         if (logStart + logRange < lines.length) {
   2844             ctx.fillText(lines[logStart + logRange], 50, top + 18 + 10 * logRange);
   2845         }
   2846     }
   2847     if (draw_legend) {
   2848         var pos = 0;
   2849         var drawSomething = draw_add | draw_active | draw_sort | draw_mark;
   2850    //     drawBox(pos++, "yellow", "black", opLetter, true, '');
   2851         drawBox(pos++, "rgba(0,0,255, 0.3)", "black", draw_intersection > 1 ? sectCount : sectMax2, draw_intersection, intersectionKey);
   2852         drawBox(pos++, "rgba(0,0,255, 0.3)", "black", draw_add ? addCount : addMax, draw_add, addKey);
   2853         drawBox(pos++, "rgba(0,0,255, 0.3)", "black", draw_active ? activeCount : activeMax, draw_active, activeKey);
   2854         drawBox(pos++, "rgba(127,127,0, 0.3)", "black", draw_angle ? angleCount : angleMax, draw_angle, angleKey);
   2855         drawBox(pos++, "rgba(127,127,0, 0.3)", "black", draw_op ? opCount : opMax, draw_op, opKey);
   2856         drawBox(pos++, "rgba(127,127,0, 0.3)", "black", draw_sort ? sortCount : sortMax, draw_sort, sortKey);
   2857         drawBox(pos++, "rgba(127,0,127, 0.3)", "black", draw_mark ? markCount : markMax, draw_mark, markKey);
   2858         drawBox(pos++, "black", "white", 
   2859                 (new Array('P', 'P1', 'P2', 'P'))[draw_path], draw_path != 0, pathKey);
   2860         drawBox(pos++, "rgba(0,63,0, 0.7)", "white",
   2861                 (new Array('Q', 'Q', 'C', 'QC', 'Qc', 'Cq'))[draw_computed],
   2862                 draw_computed != 0, computedKey);
   2863         drawBox(pos++, "green", "black", step_limit, drawSomething, '');
   2864         drawBox(pos++, "green", "black", stepMax, drawSomething, '');
   2865         drawBox(pos++, "rgba(255,0,0, 0.6)", "black", lastIndex, drawSomething & draw_log, '');
   2866         drawBox(pos++, "rgba(255,0,0, 0.6)", "black", test.length - 1, drawSomething & draw_log, '');
   2867         if (curve_t) {
   2868             drawCurveTControl();
   2869         }
   2870         ctx.font = "normal 20px Arial";
   2871         ctx.fillStyle = "rgba(0,0,0, 0.3)";
   2872         ctx.textAlign = "right";
   2873         ctx.fillText(scale.toFixed(decimal_places) + 'x' , screenWidth - 10, screenHeight - 5);
   2874     }
   2875     if (draw_hints) {
   2876         ctx.font = "normal 10px Arial";
   2877         ctx.fillStyle = "rgba(0,0,0, 0.5)";
   2878         ctx.textAlign = "right";
   2879         var y = 4;
   2880         ctx.fillText("control lines : " +  controlLinesKey, ctx.screenWidthwidth - 10, pos * 50 + y++ * 10);
   2881         ctx.fillText("curve t : " +  curveTKey, screenWidth - 10, pos * 50 + y++ * 10);
   2882         ctx.fillText("deriviatives : " +  deriviativesKey, screenWidth - 10, pos * 50 + y++ * 10);
   2883         ctx.fillText("intersect t : " +  intersectTKey, screenWidth - 10, pos * 50 + y++ * 10);
   2884         ctx.fillText("hodo : " +  hodoKey, screenWidth - 10, pos * 50 + y++ * 10);
   2885         ctx.fillText("log : " +  logKey, screenWidth - 10, pos * 50 + y++ * 10);
   2886         ctx.fillText("log curve : " +  logCurvesKey, screenWidth - 10, pos * 50 + y++ * 10);
   2887         ctx.fillText("mid point : " +  midpointKey, screenWidth - 10, pos * 50 + y++ * 10);
   2888         ctx.fillText("points : " +  ptsKey, screenWidth - 10, pos * 50 + y++ * 10);
   2889         ctx.fillText("sequence : " +  sequenceKey, screenWidth - 10, pos * 50 + y++ * 10);
   2890         ctx.fillText("xy : " +  xyKey, screenWidth - 10, pos * 50 + y++ * 10);
   2891     }
   2892 }
   2893 
   2894 function drawBox(y, backC, foreC, str, enable, label) {
   2895     ctx.beginPath();
   2896     ctx.fillStyle = backC;
   2897     ctx.rect(screenWidth - 40, y * 50 + 10, 40, 30);
   2898     ctx.fill();
   2899     ctx.font = "normal 16px Arial";
   2900     ctx.fillStyle = foreC;
   2901     ctx.textAlign = "center";
   2902     ctx.fillText(str, screenWidth - 20, y * 50 + 32);
   2903     if (!enable) {
   2904         ctx.fillStyle = "rgba(255,255,255, 0.5)";
   2905         ctx.fill();
   2906     }
   2907     if (label != '') {
   2908         ctx.font = "normal 9px Arial";
   2909         ctx.fillStyle = "black";
   2910         ctx.fillText(label, screenWidth - 47, y * 50 + 40);
   2911     }
   2912 }
   2913 
   2914 function drawCurveTControl() {
   2915     ctx.lineWidth = 2;
   2916     ctx.strokeStyle = "rgba(0,0,0, 0.3)";
   2917     ctx.beginPath();
   2918     ctx.rect(screenWidth - 80, 40, 28, screenHeight - 80);
   2919     ctx.stroke();
   2920     var ty = 40 + curveT * (screenHeight - 80);
   2921     ctx.beginPath();
   2922     ctx.moveTo(screenWidth - 80, ty);
   2923     ctx.lineTo(screenWidth - 85, ty - 5);
   2924     ctx.lineTo(screenWidth - 85, ty + 5);
   2925     ctx.lineTo(screenWidth - 80, ty);
   2926     ctx.fillStyle = "rgba(0,0,0, 0.6)";
   2927     ctx.fill();
   2928     var num = curveT.toFixed(decimal_places);
   2929     ctx.font = "normal 10px Arial";
   2930     ctx.textAlign = "left";
   2931     ctx.fillText(num, screenWidth - 78, ty);
   2932 }
   2933 
   2934 function ptInTControl() {
   2935     var e = window.event;
   2936 	var tgt = e.target || e.srcElement;
   2937     var left = tgt.offsetLeft;
   2938     var top = tgt.offsetTop;
   2939     var x = (e.clientX - left);
   2940     var y = (e.clientY - top);
   2941     if (x < screenWidth - 80 || x > screenWidth - 50) {
   2942         return false;
   2943     }
   2944     if (y < 40 || y > screenHeight - 80) {
   2945         return false;
   2946     }
   2947     curveT = (y - 40) / (screenHeight - 120);
   2948     if (curveT < 0 || curveT > 1) {
   2949         throw "stop execution";
   2950     }
   2951     return true;
   2952 }
   2953 
   2954 function drawTop() {
   2955     if (tests[testIndex] == null) {
   2956         var str = testDivs[testIndex].textContent;
   2957         parse_all(str);
   2958         var title = testDivs[testIndex].id.toString();
   2959         testTitles[testIndex] = title;
   2960     }
   2961     init(tests[testIndex]);
   2962     redraw();
   2963 }
   2964 
   2965 function redraw() {
   2966     if (focus_on_selection) {
   2967         collect_bounds = true;
   2968         draw(tests[testIndex], testLines[testIndex], testTitles[testIndex]);
   2969         collect_bounds = false;
   2970         if (focusXmin < focusXmax && focusYmin < focusYmax) {
   2971             setScale(focusXmin, focusXmax, focusYmin, focusYmax);
   2972         }
   2973     }
   2974     ctx.beginPath();
   2975     ctx.fillStyle = "white";
   2976     ctx.rect(0, 0, screenWidth, screenHeight);
   2977     ctx.fill();
   2978     draw(tests[testIndex], testLines[testIndex], testTitles[testIndex]);
   2979 }
   2980 
   2981 function dumpCurvePartial(test, id, t0, t1) {
   2982     var curve = curveByID(test, id);
   2983     var name = ["line", "quad", "cubic"][curve.length / 2 - 2];
   2984     console.log("id=" + id + " " + name + "=" +  curveToString(curve)
   2985         + " t0=" + t0 + " t1=" + t1
   2986         + " partial=" + curveToString(curvePartialByID(test, id, t0, t1)));
   2987 }
   2988 
   2989 function dumpAngleTest(test, id, t0, t1) {
   2990     var curve = curveByID(test, id);
   2991     console.log("    { {" + curveToString(curve) + "}, " 
   2992             + curve.length / 2 + ", " + t0 + ", " + t1 + ", {} }, //");
   2993 }
   2994 
   2995 function dumpLogToConsole() {
   2996     if (logStart < 0) {
   2997         return;
   2998     }
   2999     var test = tests[testIndex];
   3000     var recType = REC_TYPE_UNKNOWN;
   3001     var records;
   3002     for (var index = 0; index < test.length; index += 3) {
   3003         var lastLineNo = test[index + 1];
   3004         if (lastLineNo >= logStart && lastLineNo < logStart + logRange) {
   3005             recType = test[index];
   3006             records = test[index + 2];
   3007             break;
   3008         }
   3009     }
   3010     if (recType == REC_TYPE_UNKNOWN) {
   3011         return;
   3012     }
   3013     var lines = testLines[testIndex];
   3014     for (var idx = 0; idx < logRange; ++idx) {
   3015         var line = lines[logStart + idx];
   3016         console.log(line);
   3017         for (var recordIndex = 0; recordIndex < records.length; recordIndex += 2) {
   3018             var fragType = records[recordIndex];
   3019             var frags = records[recordIndex + 1];
   3020             if (recType == REC_TYPE_ANGLE && fragType == ANGLE_AFTER) {
   3021                 dumpCurvePartial(test, frags[0], frags[3], frags[4]);
   3022                 dumpCurvePartial(test, frags[5], frags[8], frags[9]);
   3023                 dumpCurvePartial(test, frags[10], frags[13], frags[14]);
   3024                 console.log("\nstatic IntersectData intersectDataSet[] = {");
   3025                 dumpAngleTest(test, frags[0], frags[3], frags[4]);
   3026                 dumpAngleTest(test, frags[5], frags[8], frags[9]);
   3027                 dumpAngleTest(test, frags[10], frags[13], frags[14]);
   3028                 console.log("};");
   3029             } else if (recType == REC_TYPE_ANGLE && fragType == ANGLE_AFTER2) {
   3030                 dumpCurvePartial(test, frags[0], frags[4], frags[5]);
   3031                 dumpCurvePartial(test, frags[6], frags[10], frags[11]);
   3032                 dumpCurvePartial(test, frags[12], frags[16], frags[17]);
   3033                 console.log("\nstatic IntersectData intersectDataSet[] = { //");
   3034                 dumpAngleTest(test, frags[0], frags[4], frags[5]);
   3035                 dumpAngleTest(test, frags[6], frags[10], frags[11]);
   3036                 dumpAngleTest(test, frags[12], frags[16], frags[17]);
   3037                 console.log("}; //");
   3038             }
   3039         }
   3040     }
   3041 }
   3042 
   3043 var activeKey = 'a';
   3044 var pathKey = 'b';
   3045 var pathBackKey = 'B';
   3046 var centerKey = 'c';
   3047 var addKey = 'd';
   3048 var deriviativesKey = 'f';
   3049 var angleKey = 'g';
   3050 var angleBackKey = 'G';
   3051 var hodoKey = 'h';
   3052 var intersectionKey = 'i';
   3053 var intersectionBackKey = 'I';
   3054 var sequenceKey = 'j';
   3055 var midpointKey = 'k';
   3056 var logKey = 'l';
   3057 var logToConsoleKey = 'L';
   3058 var markKey = 'm';
   3059 var sortKey = 'o';
   3060 var opKey = 'p';
   3061 var opBackKey = 'P';
   3062 var computedKey = 'q';
   3063 var computedBackKey = 'Q';
   3064 var stepKey = 's';
   3065 var stepBackKey = 'S';
   3066 var intersectTKey = 't';
   3067 var curveTKey = 'u';
   3068 var controlLinesBackKey = 'V';
   3069 var controlLinesKey = 'v';
   3070 var ptsKey = 'x';
   3071 var xyKey = 'y';
   3072 var logCurvesKey = 'z';
   3073 var focusKey = '`';
   3074 var idKey = '.';
   3075 var retinaKey = '\\';
   3076 
   3077 function doKeyPress(evt) {
   3078     var char = String.fromCharCode(evt.charCode);
   3079     var focusWasOn = false;
   3080     switch (char) {
   3081     case '0':
   3082     case '1':
   3083     case '2':
   3084     case '3':
   3085     case '4':
   3086     case '5':
   3087     case '6':
   3088     case '7':
   3089     case '8':
   3090     case '9':
   3091         decimal_places = char - '0';
   3092         redraw();
   3093         break;
   3094     case activeKey:
   3095         draw_active ^= true;
   3096         redraw(); 
   3097         break;
   3098     case addKey:
   3099         draw_add ^= true;
   3100         redraw(); 
   3101         break;
   3102     case angleKey:
   3103         draw_angle = (draw_angle + 1) % 3;
   3104         redraw();
   3105         break;
   3106     case angleBackKey:
   3107         draw_angle = (draw_angle + 2) % 3;
   3108         redraw();
   3109         break;
   3110     case centerKey:
   3111         setScale(xmin, xmax, ymin, ymax);
   3112         redraw(); 
   3113         break;
   3114     case controlLinesBackKey:
   3115         control_lines = (control_lines + 3) % 4;
   3116         redraw(); 
   3117         break;
   3118     case controlLinesKey:
   3119         control_lines = (control_lines + 1) % 4;
   3120         redraw(); 
   3121         break;
   3122     case computedBackKey:
   3123         draw_computed = (draw_computed + 5) % 6;
   3124         redraw(); 
   3125         break;
   3126     case computedKey:
   3127         draw_computed = (draw_computed + 1) % 6;
   3128         redraw(); 
   3129         break;
   3130     case curveTKey:
   3131         curve_t ^= true;
   3132         if (curve_t) {
   3133             draw_legend = true;
   3134         }
   3135         redraw();
   3136         break;
   3137     case deriviativesKey:
   3138         draw_deriviatives = (draw_deriviatives + 1) % 3;
   3139         redraw();
   3140         break;
   3141     case focusKey:
   3142         focus_on_selection ^= true;
   3143         setScale(xmin, xmax, ymin, ymax);
   3144         redraw();
   3145         break;
   3146     case hodoKey:
   3147         draw_hodo = (draw_hodo + 1) % 4;
   3148         redraw();
   3149         break;
   3150     case idKey:
   3151         draw_id ^= true;
   3152         redraw();
   3153         break;
   3154     case intersectionBackKey:
   3155         draw_intersection = (draw_intersection + 3) % 4;
   3156         redraw(); 
   3157         break;
   3158     case intersectionKey:
   3159         draw_intersection = (draw_intersection + 1) % 4;
   3160         redraw(); 
   3161         break;
   3162     case intersectTKey:
   3163         draw_intersectT ^= true;
   3164         redraw();
   3165         break;
   3166     case logCurvesKey:
   3167         logCurves(tests[testIndex]);
   3168         break;
   3169     case logKey:
   3170         draw_log ^= true;
   3171         redraw();
   3172         break;
   3173     case logToConsoleKey:
   3174         if (draw_log) {
   3175             dumpLogToConsole();
   3176         }
   3177         break;
   3178     case markKey:
   3179         draw_mark ^= true;
   3180         redraw();
   3181         break;
   3182     case midpointKey:
   3183         draw_midpoint ^= true;
   3184         redraw();
   3185         break;
   3186     case opKey:
   3187         draw_op = (draw_op + 1) % 3;
   3188         redraw();
   3189         break;
   3190     case opBackKey:
   3191         draw_op = (draw_op + 2) % 3;
   3192         redraw();
   3193         break;
   3194     case pathKey:
   3195         draw_path = (draw_path + 1) % 4;
   3196         redraw(); 
   3197         break;
   3198     case pathBackKey:
   3199         draw_path = (draw_path + 3) % 4;
   3200         redraw(); 
   3201         break;
   3202     case ptsKey:
   3203         pt_labels = (pt_labels + 1) % 3;
   3204         redraw();
   3205         break;
   3206     case retinaKey:
   3207         retina_scale ^= true;
   3208         drawTop();
   3209         break;
   3210     case sequenceKey:
   3211         draw_sequence ^= true;
   3212         redraw();
   3213         break;
   3214     case sortKey:
   3215         draw_sort = (draw_sort + 1) % 3;
   3216         drawTop();
   3217         break;
   3218     case stepKey:
   3219         step_limit++;
   3220         if (step_limit > stepMax) {
   3221             step_limit = stepMax;
   3222         }
   3223         redraw();
   3224         break;
   3225     case stepBackKey:
   3226         step_limit--;
   3227         if (step_limit < 0) {
   3228             step_limit = 0;
   3229         }
   3230         redraw();
   3231         break;
   3232     case xyKey:
   3233         debug_xy = (debug_xy + 1) % 3;
   3234         redraw();
   3235         break;
   3236     case '-':
   3237         focusWasOn = focus_on_selection;
   3238         if (focusWasOn) {
   3239             focus_on_selection = false;
   3240             scale /= 1.2;
   3241         } else {
   3242             scale /= 2;
   3243             calcLeftTop();
   3244         }
   3245         redraw();
   3246         focus_on_selection = focusWasOn;
   3247         break;
   3248     case '=':
   3249     case '+':
   3250         focusWasOn = focus_on_selection;
   3251         if (focusWasOn) {
   3252             focus_on_selection = false;
   3253             scale *= 1.2;
   3254         } else {
   3255             scale *= 2;
   3256             calcLeftTop();
   3257         }
   3258         redraw();
   3259         focus_on_selection = focusWasOn;
   3260         break;
   3261     case '?':
   3262         draw_hints ^= true;
   3263         if (draw_hints && !draw_legend) {
   3264             draw_legend = true;
   3265         }
   3266         redraw();
   3267         break;
   3268     case '/':
   3269         draw_legend ^= true;
   3270         redraw();
   3271         break;
   3272     }
   3273 }
   3274 
   3275 function doKeyDown(evt) {
   3276     var char = evt.keyCode;
   3277     var preventDefault = false;
   3278     switch (char) {
   3279     case 37: // left arrow
   3280         if (evt.shiftKey) {
   3281             testIndex -= 9;
   3282         }
   3283         if (--testIndex < 0)
   3284             testIndex = tests.length - 1;
   3285         drawTop();
   3286         preventDefault = true;
   3287         break;
   3288     case 39: // right arrow
   3289         if (evt.shiftKey) {
   3290             testIndex += 9;
   3291         }
   3292         if (++testIndex >= tests.length)
   3293             testIndex = 0;
   3294         drawTop();
   3295         preventDefault = true;
   3296         break;
   3297     }
   3298     if (preventDefault) {
   3299           evt.preventDefault();
   3300           return false;
   3301     }
   3302     return true;
   3303 }
   3304 
   3305 (function() {
   3306     var hidden = "hidden";
   3307 
   3308     // Standards:
   3309     if (hidden in document)
   3310         document.addEventListener("visibilitychange", onchange);
   3311     else if ((hidden = "mozHidden") in document)
   3312         document.addEventListener("mozvisibilitychange", onchange);
   3313     else if ((hidden = "webkitHidden") in document)
   3314         document.addEventListener("webkitvisibilitychange", onchange);
   3315     else if ((hidden = "msHidden") in document)
   3316         document.addEventListener("msvisibilitychange", onchange);
   3317     // IE 9 and lower:
   3318     else if ('onfocusin' in document)
   3319         document.onfocusin = document.onfocusout = onchange;
   3320     // All others:
   3321     else
   3322         window.onpageshow = window.onpagehide 
   3323             = window.onfocus = window.onblur = onchange;
   3324 
   3325     function onchange (evt) {
   3326         var v = 'visible', h = 'hidden',
   3327             evtMap = { 
   3328                 focus:v, focusin:v, pageshow:v, blur:h, focusout:h, pagehide:h 
   3329             };
   3330 
   3331         evt = evt || window.event;
   3332         if (evt.type in evtMap)
   3333             document.body.className = evtMap[evt.type];
   3334         else        
   3335             document.body.className = this[hidden] ? "hidden" : "visible";
   3336     }
   3337 })();
   3338 
   3339 function calcXY() {
   3340     var e = window.event;
   3341 	var tgt = e.target || e.srcElement;
   3342     var left = tgt.offsetLeft;
   3343     var top = tgt.offsetTop;
   3344     mouseX = (e.clientX - left) / scale + srcLeft;
   3345     mouseY = (e.clientY - top) / scale + srcTop;
   3346 }
   3347 
   3348 function calcLeftTop() {
   3349     srcLeft = mouseX - screenWidth / 2 / scale;
   3350     srcTop = mouseY - screenHeight / 2 / scale;
   3351 }
   3352 
   3353 var disableClick = false;
   3354 
   3355 function handleMouseClick() {
   3356     if (disableClick) {
   3357         return;
   3358     }
   3359     if (!curve_t || !ptInTControl()) {
   3360         calcXY();
   3361         calcLeftTop();
   3362     }
   3363     redraw();
   3364 //    if (!curve_t || !ptInTControl()) {
   3365 //        mouseX = screenWidth / 2 / scale + srcLeft;
   3366 //        mouseY = screenHeight / 2 / scale + srcTop;
   3367 //    }
   3368 }
   3369 
   3370 function handleMouseOver() {
   3371     calcXY();
   3372     if (debug_xy != 2) {
   3373         return;
   3374     }
   3375     var num = mouseX.toFixed(decimal_places) + ", " + mouseY.toFixed(decimal_places);
   3376     ctx.beginPath();
   3377     ctx.rect(300,100,num.length * 6,10);
   3378     ctx.fillStyle="white";
   3379     ctx.fill();
   3380     ctx.font = "normal 10px Arial";
   3381     ctx.fillStyle="black";
   3382     ctx.textAlign = "left";
   3383     ctx.fillText(num, 300, 108);
   3384 }
   3385 
   3386 function start() {
   3387     for (var i = 0; i < testDivs.length; ++i) {
   3388         tests[i] = null;
   3389     }
   3390     testIndex = 0;
   3391     drawTop();
   3392     window.addEventListener('keypress', doKeyPress, true);
   3393     window.addEventListener('keydown', doKeyDown, true);
   3394     window.onresize = function() {
   3395         drawTop();
   3396     }
   3397     /*
   3398     window.onpagehide = function() {
   3399         disableClick = true;
   3400     }
   3401     */
   3402     window.onpageshow = function () {
   3403         disableClick = false;
   3404     }
   3405 }
   3406 
   3407 </script>
   3408 </head>
   3409 
   3410 <body onLoad="start();">
   3411 <canvas id="canvas" width="750" height="500"
   3412     onmousemove="handleMouseOver()"
   3413     onclick="handleMouseClick()"
   3414     ></canvas >
   3415 </body>
   3416 </html>
   3417