1 /* 2 * Copyright 2013 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "gm.h" 9 #include "SkCanvas.h" 10 #include "SkPath.h" 11 12 namespace skiagm { 13 14 static SkPath generate_square(SkScalar cx, SkScalar cy, SkScalar w) { 15 SkRect rect = SkRect::MakeXYWH(cx - w / 2, cy - w / 2, w, w); 16 SkPath path; 17 path.addRect(rect); 18 return path; 19 } 20 21 static SkPath generate_rect_line(SkScalar cx, SkScalar cy, SkScalar l) { 22 SkRect rect = SkRect::MakeXYWH(cx - l / 2, cy, l, 0); 23 SkPath path; 24 path.addRect(rect); 25 return path; 26 } 27 28 static SkPath generate_circle(SkScalar cx, SkScalar cy, SkScalar d) { 29 SkPath path; 30 path.addCircle(cx, cy, d/2, SkPath::kCW_Direction); 31 return path; 32 } 33 34 static SkPath generate_line(SkScalar cx, SkScalar cy, SkScalar l) { 35 SkPath path; 36 path.moveTo(cx - l / 2, cy); 37 path.lineTo(cx + l / 2, cy); 38 return path; 39 } 40 41 SkPaint::Style styles[] = { 42 SkPaint::kStroke_Style, 43 SkPaint::kStrokeAndFill_Style, 44 SkPaint::kFill_Style 45 }; 46 SkScalar pathSizes[] = { 47 40, 48 10, 49 0 50 }; 51 SkScalar strokeWidths[] = { 52 10, 53 0 54 }; 55 SkPath ((*paths[])(SkScalar, SkScalar, SkScalar)) = { 56 generate_square, 57 generate_rect_line, 58 generate_circle, 59 generate_line 60 }; 61 62 const SkScalar slideWidth = 90, slideHeight = 90; 63 const SkScalar slideBoundary = 5; 64 65 66 class InversePathsGM : public GM { 67 public: 68 InversePathsGM() { 69 70 } 71 72 protected: 73 virtual SkString onShortName() { 74 return SkString("inverse_paths"); 75 } 76 77 virtual SkISize onISize() { 78 return make_isize(800, 900); 79 } 80 81 virtual void onDraw(SkCanvas* canvas) { 82 SkScalar cx = slideWidth / 2 + slideBoundary; 83 SkScalar cy = slideHeight / 2 + slideBoundary; 84 SkScalar dx = slideWidth + 2 * slideBoundary; 85 SkScalar dy = slideHeight + 2 * slideBoundary; 86 87 SkRect clipRect = SkRect::MakeLTRB(slideBoundary, slideBoundary, 88 slideBoundary + slideWidth, 89 slideBoundary + slideHeight); 90 SkPaint clipPaint; 91 clipPaint.setStyle(SkPaint::kStroke_Style); 92 clipPaint.setStrokeWidth(SkIntToScalar(2)); 93 94 SkPaint outlinePaint; 95 outlinePaint.setColor(0x40000000); 96 outlinePaint.setStyle(SkPaint::kStroke_Style); 97 outlinePaint.setStrokeWidth(SkIntToScalar(0)); 98 99 for (size_t styleIndex = 0; styleIndex < SK_ARRAY_COUNT(styles); 100 styleIndex++) { 101 for (size_t sizeIndex = 0; sizeIndex < SK_ARRAY_COUNT(pathSizes); 102 sizeIndex++) { 103 SkScalar size = pathSizes[sizeIndex]; 104 105 canvas->save(); 106 107 for (size_t widthIndex = 0; 108 widthIndex < SK_ARRAY_COUNT(strokeWidths); 109 widthIndex++) { 110 SkPaint paint; 111 paint.setColor(0xff007000); 112 paint.setStrokeWidth(strokeWidths[widthIndex]); 113 paint.setStyle(styles[styleIndex]); 114 115 for (size_t pathIndex = 0; 116 pathIndex < SK_ARRAY_COUNT(paths); 117 pathIndex++) { 118 canvas->drawRect(clipRect, clipPaint); 119 120 canvas->save(); 121 canvas->clipRect(clipRect); 122 123 SkPath path = paths[pathIndex](cx, cy, size); 124 path.setFillType(SkPath::kInverseWinding_FillType); 125 canvas->drawPath(path, paint); 126 127 path.setFillType(SkPath::kWinding_FillType); 128 canvas->drawPath(path, outlinePaint); 129 130 canvas->restore(); 131 canvas->translate(dx, 0); 132 } 133 } 134 135 canvas->restore(); 136 canvas->translate(0, dy); 137 } 138 } 139 } 140 141 private: 142 typedef GM INHERITED; 143 }; 144 145 DEF_GM( return new InversePathsGM; ) 146 } 147