1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "gm.h" 9 #include "SkParsePath.h" 10 #include "SkPath.h" 11 12 /* 13 The arcto test below should draw the same as this SVG: 14 (Note that Skia's arcTo Direction parameter value is opposite SVG's sweep value, e.g. 0 / 1) 15 16 <svg width="500" height="600"> 17 <path d="M 50,100 A50,50, 0,0,1, 150,200" style="stroke:#660000; fill:none; stroke-width:2" /> 18 <path d="M100,100 A50,100, 0,0,1, 200,200" style="stroke:#660000; fill:none; stroke-width:2" /> 19 <path d="M150,100 A50,50, 45,0,1, 250,200" style="stroke:#660000; fill:none; stroke-width:2" /> 20 <path d="M200,100 A50,100, 45,0,1, 300,200" style="stroke:#660000; fill:none; stroke-width:2" /> 21 22 <path d="M150,200 A50,50, 0,1,0, 150,300" style="stroke:#660000; fill:none; stroke-width:2" /> 23 <path d="M200,200 A50,100, 0,1,0, 200,300" style="stroke:#660000; fill:none; stroke-width:2" /> 24 <path d="M250,200 A50,50, 45,1,0, 250,300" style="stroke:#660000; fill:none; stroke-width:2" /> 25 <path d="M300,200 A50,100, 45,1,0, 300,300" style="stroke:#660000; fill:none; stroke-width:2" /> 26 27 <path d="M250,400 A120,80 0 0,0 250,500" 28 fill="none" stroke="red" stroke-width="5" /> 29 30 <path d="M250,400 A120,80 0 1,1 250,500" 31 fill="none" stroke="green" stroke-width="5"/> 32 33 <path d="M250,400 A120,80 0 1,0 250,500" 34 fill="none" stroke="purple" stroke-width="5"/> 35 36 <path d="M250,400 A120,80 0 0,1 250,500" 37 fill="none" stroke="blue" stroke-width="5"/> 38 39 <path d="M100,100 A 0, 0 0 0,1 200,200" 40 fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/> 41 42 <path d="M200,100 A 80,80 0 0,1 200,100" 43 fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/> 44 </svg> 45 */ 46 47 DEF_SIMPLE_GM(arcto, canvas, 500, 600) { 48 SkPaint paint; 49 paint.setAntiAlias(true); 50 paint.setStyle(SkPaint::kStroke_Style); 51 paint.setStrokeWidth(2); 52 paint.setColor(0xFF660000); 53 // canvas->scale(2, 2); // for testing on retina 54 SkRect oval = SkRect::MakeXYWH(100, 100, 100, 100); 55 SkPath svgArc; 56 57 for (int angle = 0; angle <= 45; angle += 45) { 58 for (int oHeight = 2; oHeight >= 1; --oHeight) { 59 SkScalar ovalHeight = oval.height() / oHeight; 60 svgArc.moveTo(oval.fLeft, oval.fTop); 61 svgArc.arcTo(oval.width() / 2, ovalHeight, SkIntToScalar(angle), SkPath::kSmall_ArcSize, 62 SkPath::kCW_Direction, oval.right(), oval.bottom()); 63 canvas->drawPath(svgArc, paint); 64 svgArc.reset(); 65 66 svgArc.moveTo(oval.fLeft + 100, oval.fTop + 100); 67 svgArc.arcTo(oval.width() / 2, ovalHeight, SkIntToScalar(angle), SkPath::kLarge_ArcSize, 68 SkPath::kCCW_Direction, oval.right(), oval.bottom() + 100); 69 canvas->drawPath(svgArc, paint); 70 oval.offset(50, 0); 71 svgArc.reset(); 72 73 } 74 } 75 76 paint.setStrokeWidth(5); 77 const SkColor purple = 0xFF800080; 78 const SkColor darkgreen = 0xFF008000; 79 const SkColor colors[] = { SK_ColorRED, darkgreen, purple, SK_ColorBLUE }; 80 const char* arcstrs[] = { 81 "M250,400 A120,80 0 0,0 250,500", 82 "M250,400 A120,80 0 1,1 250,500", 83 "M250,400 A120,80 0 1,0 250,500", 84 "M250,400 A120,80 0 0,1 250,500" 85 }; 86 int cIndex = 0; 87 for (const char* arcstr : arcstrs) { 88 SkParsePath::FromSVGString(arcstr, &svgArc); 89 paint.setColor(colors[cIndex++]); 90 canvas->drawPath(svgArc, paint); 91 } 92 93 // test that zero length arcs still draw round cap 94 paint.setStrokeCap(SkPaint::kRound_Cap); 95 SkPath path; 96 path.moveTo(100, 100); 97 path.arcTo(0, 0, 0, SkPath::kLarge_ArcSize, SkPath::kCW_Direction, 200, 200); 98 canvas->drawPath(path, paint); 99 100 path.reset(); 101 path.moveTo(200, 100); 102 path.arcTo(80, 80, 0, SkPath::kLarge_ArcSize, SkPath::kCW_Direction, 200, 100); 103 canvas->drawPath(path, paint); 104 } 105 106 #include "random_parse_path.h" 107 #include "SkRandom.h" 108 109 /* The test below generates a reference image using SVG. To compare the result for correctness, 110 enable the define below and then view the generated SVG in a browser. 111 */ 112 #define GENERATE_SVG_REFERENCE 0 113 114 #if GENERATE_SVG_REFERENCE 115 #include "SkOSFile.h" 116 #endif 117 118 enum { 119 kParsePathTestDimension = 500 120 }; 121 122 DEF_SIMPLE_GM(parsedpaths, canvas, kParsePathTestDimension, kParsePathTestDimension) { 123 #if GENERATE_SVG_REFERENCE 124 FILE* file = sk_fopen("svgout.htm", kWrite_SkFILE_Flag); 125 SkString str; 126 str.printf("<svg width=\"%d\" height=\"%d\">\n", kParsePathTestDimension, 127 kParsePathTestDimension); 128 sk_fwrite(str.c_str(), str.size(), file); 129 #endif 130 SkRandom rand; 131 SkPaint paint; 132 paint.setAntiAlias(true); 133 for (int xStart = 0; xStart < kParsePathTestDimension; xStart += 100) { 134 canvas->save(); 135 for (int yStart = 0; yStart < kParsePathTestDimension; yStart += 100) { 136 #if GENERATE_SVG_REFERENCE 137 str.printf("<g transform='translate(%d,%d) scale(%d,%d)'>\n", xStart, yStart, 138 1, 1); 139 sk_fwrite(str.c_str(), str.size(), file); 140 str.printf("<clipPath id='clip_%d_%d'>\n", xStart, yStart); 141 sk_fwrite(str.c_str(), str.size(), file); 142 str.printf("<rect width='100' height='100' x='0' y='0'></rect>\n"); 143 sk_fwrite(str.c_str(), str.size(), file); 144 str.printf("</clipPath>\n"); 145 sk_fwrite(str.c_str(), str.size(), file); 146 #endif 147 int count = 3; 148 do { 149 SkPath path; 150 SkString spec; 151 uint32_t y = rand.nextRangeU(30, 70); 152 uint32_t x = rand.nextRangeU(30, 70); 153 spec.printf("M %d,%d\n", x, y); 154 uint32_t count = rand.nextRangeU(0, 10); 155 for (uint32_t i = 0; i < count; ++i) { 156 spec.append(MakeRandomParsePathPiece(&rand)); 157 } 158 SkAssertResult(SkParsePath::FromSVGString(spec.c_str(), &path)); 159 paint.setColor(rand.nextU()); 160 canvas->save(); 161 canvas->clipRect(SkRect::MakeIWH(100, 100)); 162 canvas->drawPath(path, paint); 163 canvas->restore(); 164 #if GENERATE_SVG_REFERENCE 165 str.printf("<path d='\n"); 166 sk_fwrite(str.c_str(), str.size(), file); 167 sk_fwrite(spec.c_str(), spec.size(), file); 168 str.printf("\n' fill='#%06x' fill-opacity='%g'", paint.getColor() & 0xFFFFFF, 169 paint.getAlpha() / 255.f); 170 sk_fwrite(str.c_str(), str.size(), file); 171 str.printf(" clip-path='url(#clip_%d_%d)'/>\n", xStart, yStart); 172 sk_fwrite(str.c_str(), str.size(), file); 173 #endif 174 } while (--count > 0); 175 #if GENERATE_SVG_REFERENCE 176 str.printf("</g>\n"); 177 sk_fwrite(str.c_str(), str.size(), file); 178 #endif 179 canvas->translate(0, 100); 180 } 181 canvas->restore(); 182 canvas->translate(100, 0); 183 } 184 #if GENERATE_SVG_REFERENCE 185 const char trailer[] = "</svg>\n"; 186 sk_fwrite(trailer, sizeof(trailer) - 1, file); 187 sk_fclose(file); 188 #endif 189 } 190
