1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 #include "gm.h" 9 #include "SkRandom.h" 10 #include "SkTArray.h" 11 12 namespace skiagm { 13 14 class ConvexPathsGM : public GM { 15 public: 16 ConvexPathsGM() { 17 this->setBGColor(0xFF000000); 18 this->makePaths(); 19 } 20 21 protected: 22 virtual SkString onShortName() { 23 return SkString("convexpaths"); 24 } 25 26 27 virtual SkISize onISize() { 28 return make_isize(1200, 900); 29 } 30 31 void makePaths() { 32 // CW 33 fPaths.push_back().moveTo(0, 0); 34 fPaths.back().quadTo(50 * SK_Scalar1, 100 * SK_Scalar1, 35 0, 100 * SK_Scalar1); 36 fPaths.back().lineTo(0, 0); 37 38 // CCW 39 fPaths.push_back().moveTo(0, 0); 40 fPaths.back().lineTo(0, 100 * SK_Scalar1); 41 fPaths.back().quadTo(50 * SK_Scalar1, 100 * SK_Scalar1, 42 0, 0); 43 44 // CW 45 fPaths.push_back().moveTo(0, 50 * SK_Scalar1); 46 fPaths.back().quadTo(50 * SK_Scalar1, 0, 47 100 * SK_Scalar1, 50 * SK_Scalar1); 48 fPaths.back().quadTo(50 * SK_Scalar1, 100 * SK_Scalar1, 49 0, 50 * SK_Scalar1); 50 51 // CCW 52 fPaths.push_back().moveTo(0, 50 * SK_Scalar1); 53 fPaths.back().quadTo(50 * SK_Scalar1, 100 * SK_Scalar1, 54 100 * SK_Scalar1, 50 * SK_Scalar1); 55 fPaths.back().quadTo(50 * SK_Scalar1, 0, 56 0, 50 * SK_Scalar1); 57 58 fPaths.push_back().addRect(0, 0, 59 100 * SK_Scalar1, 100 * SK_Scalar1, 60 SkPath::kCW_Direction); 61 62 fPaths.push_back().addRect(0, 0, 63 100 * SK_Scalar1, 100 * SK_Scalar1, 64 SkPath::kCCW_Direction); 65 66 fPaths.push_back().addCircle(50 * SK_Scalar1, 50 * SK_Scalar1, 67 50 * SK_Scalar1, SkPath::kCW_Direction); 68 69 fPaths.push_back().addCircle(50 * SK_Scalar1, 50 * SK_Scalar1, 70 40 * SK_Scalar1, SkPath::kCCW_Direction); 71 72 fPaths.push_back().addOval(SkRect::MakeXYWH(0, 0, 73 50 * SK_Scalar1, 74 100 * SK_Scalar1), 75 SkPath::kCW_Direction); 76 77 fPaths.push_back().addOval(SkRect::MakeXYWH(0, 0, 78 100 * SK_Scalar1, 79 50 * SK_Scalar1), 80 SkPath::kCCW_Direction); 81 82 fPaths.push_back().addOval(SkRect::MakeXYWH(0, 0, 83 100 * SK_Scalar1, 84 5 * SK_Scalar1), 85 SkPath::kCCW_Direction); 86 87 fPaths.push_back().addOval(SkRect::MakeXYWH(0, 0, 88 SK_Scalar1, 89 100 * SK_Scalar1), 90 SkPath::kCCW_Direction); 91 92 fPaths.push_back().addRoundRect(SkRect::MakeXYWH(0, 0, 93 SK_Scalar1 * 100, 94 SK_Scalar1 * 100), 95 40 * SK_Scalar1, 20 * SK_Scalar1, 96 SkPath::kCW_Direction); 97 98 fPaths.push_back().addRoundRect(SkRect::MakeXYWH(0, 0, 99 SK_Scalar1 * 100, 100 SK_Scalar1 * 100), 101 20 * SK_Scalar1, 40 * SK_Scalar1, 102 SkPath::kCCW_Direction); 103 104 // shallow diagonals 105 fPaths.push_back().lineTo(100 * SK_Scalar1, SK_Scalar1); 106 fPaths.back().lineTo(98 * SK_Scalar1, 100 * SK_Scalar1); 107 fPaths.back().lineTo(3 * SK_Scalar1, 96 * SK_Scalar1); 108 109 /* 110 It turns out arcTos are not automatically marked as convex and they 111 may in fact be ever so slightly concave. 112 fPaths.push_back().arcTo(SkRect::MakeXYWH(0, 0, 113 50 * SK_Scalar1, 114 100 * SK_Scalar1), 115 25 * SK_Scalar1, 130 * SK_Scalar1, false); 116 */ 117 118 // cubics 119 fPaths.push_back().cubicTo( 1 * SK_Scalar1, 1 * SK_Scalar1, 120 10 * SK_Scalar1, 90 * SK_Scalar1, 121 0 * SK_Scalar1, 100 * SK_Scalar1); 122 fPaths.push_back().cubicTo(100 * SK_Scalar1, 50 * SK_Scalar1, 123 20 * SK_Scalar1, 100 * SK_Scalar1, 124 0 * SK_Scalar1, 0 * SK_Scalar1); 125 126 // triangle where one edge is a degenerate quad 127 fPaths.push_back().moveTo(SkFloatToScalar(8.59375f), 45 * SK_Scalar1); 128 fPaths.back().quadTo(SkFloatToScalar(16.9921875f), 45 * SK_Scalar1, 129 SkFloatToScalar(31.25f), 45 * SK_Scalar1); 130 fPaths.back().lineTo(100 * SK_Scalar1, 100 * SK_Scalar1); 131 fPaths.back().lineTo(SkFloatToScalar(8.59375f), 45 * SK_Scalar1); 132 133 // point degenerate 134 fPaths.push_back().moveTo(50 * SK_Scalar1, 50 * SK_Scalar1); 135 fPaths.back().lineTo(50 * SK_Scalar1, 50 * SK_Scalar1); 136 137 fPaths.push_back().moveTo(50 * SK_Scalar1, 50 * SK_Scalar1); 138 fPaths.back().quadTo(50 * SK_Scalar1, 50 * SK_Scalar1, 139 50 * SK_Scalar1, 50 * SK_Scalar1); 140 fPaths.push_back().moveTo(50 * SK_Scalar1, 50 * SK_Scalar1); 141 fPaths.back().cubicTo(50 * SK_Scalar1, 50 * SK_Scalar1, 142 50 * SK_Scalar1, 50 * SK_Scalar1, 143 50 * SK_Scalar1, 50 * SK_Scalar1); 144 145 // moveTo only paths 146 fPaths.push_back().moveTo(0, 0); 147 fPaths.back().moveTo(0, 0); 148 fPaths.back().moveTo(SK_Scalar1, SK_Scalar1); 149 fPaths.back().moveTo(SK_Scalar1, SK_Scalar1); 150 fPaths.back().moveTo(10 * SK_Scalar1, 10 * SK_Scalar1); 151 152 fPaths.push_back().moveTo(0, 0); 153 fPaths.back().moveTo(0, 0); 154 155 // line degenerate 156 fPaths.push_back().lineTo(100 * SK_Scalar1, 100 * SK_Scalar1); 157 fPaths.push_back().quadTo(100 * SK_Scalar1, 100 * SK_Scalar1, 0, 0); 158 fPaths.push_back().quadTo(100 * SK_Scalar1, 100 * SK_Scalar1, 159 50 * SK_Scalar1, 50 * SK_Scalar1); 160 fPaths.push_back().quadTo(50 * SK_Scalar1, 50 * SK_Scalar1, 161 100 * SK_Scalar1, 100 * SK_Scalar1); 162 fPaths.push_back().cubicTo(0, 0, 163 0, 0, 164 100 * SK_Scalar1, 100 * SK_Scalar1); 165 166 // small circle. This is listed last so that it has device coords far 167 // from the origin (small area relative to x,y values). 168 fPaths.push_back().addCircle(0, 0, SkFloatToScalar(0.8f)); 169 } 170 171 virtual void onDraw(SkCanvas* canvas) { 172 173 SkPaint paint; 174 paint.setAntiAlias(true); 175 SkRandom rand; 176 canvas->translate(20 * SK_Scalar1, 20 * SK_Scalar1); 177 for (int i = 0; i < fPaths.count(); ++i) { 178 canvas->save(); 179 // position the path, and make it at off-integer coords. 180 canvas->translate(SK_Scalar1 * 200 * (i % 5) + SK_Scalar1 / 4, 181 SK_Scalar1 * 200 * (i / 5) + 3 * SK_Scalar1 / 4); 182 SkColor color = rand.nextU(); 183 color |= 0xff000000; 184 paint.setColor(color); 185 SkASSERT(fPaths[i].isConvex()); 186 canvas->drawPath(fPaths[i], paint); 187 canvas->restore(); 188 } 189 } 190 191 private: 192 typedef GM INHERITED; 193 SkTArray<SkPath> fPaths; 194 }; 195 196 ////////////////////////////////////////////////////////////////////////////// 197 198 static GM* MyFactory(void*) { return new ConvexPathsGM; } 199 static GMRegistry reg(MyFactory); 200 201 } 202 203
