1 /* 2 * Copyright 2011 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 "SampleCode.h" 9 #include "SkAAClip.h" 10 #include "SkView.h" 11 #include "SkCanvas.h" 12 #include "SkColorPriv.h" 13 #include "SkPaint.h" 14 #include "SkPath.h" 15 #include "SkRandom.h" 16 #include "SkClipOpPriv.h" 17 18 constexpr int W = 150; 19 constexpr int H = 200; 20 21 static void show_text(SkCanvas* canvas, bool doAA) { 22 SkRandom rand; 23 SkPaint paint; 24 paint.setAntiAlias(doAA); 25 paint.setLCDRenderText(true); 26 paint.setTextSize(SkIntToScalar(20)); 27 28 for (int i = 0; i < 200; ++i) { 29 paint.setColor((SK_A32_MASK << SK_A32_SHIFT) | rand.nextU()); 30 canvas->drawString("Hamburgefons", 31 rand.nextSScalar1() * W, rand.nextSScalar1() * H + 20, 32 paint); 33 } 34 } 35 36 static void show_fill(SkCanvas* canvas, bool doAA) { 37 SkRandom rand; 38 SkPaint paint; 39 paint.setAntiAlias(doAA); 40 41 for (int i = 0; i < 50; ++i) { 42 SkRect r; 43 SkPath p; 44 45 r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H, 46 rand.nextUScalar1() * W, rand.nextUScalar1() * H); 47 paint.setColor(rand.nextU()); 48 canvas->drawRect(r, paint); 49 50 r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H, 51 rand.nextUScalar1() * W, rand.nextUScalar1() * H); 52 paint.setColor(rand.nextU()); 53 p.addOval(r); 54 canvas->drawPath(p, paint); 55 } 56 } 57 58 static SkScalar randRange(SkRandom& rand, SkScalar min, SkScalar max) { 59 SkASSERT(min <= max); 60 return min + rand.nextUScalar1() * (max - min); 61 } 62 63 static void show_stroke(SkCanvas* canvas, bool doAA, SkScalar strokeWidth, int n) { 64 SkRandom rand; 65 SkPaint paint; 66 paint.setAntiAlias(doAA); 67 paint.setStyle(SkPaint::kStroke_Style); 68 paint.setStrokeWidth(strokeWidth); 69 70 for (int i = 0; i < n; ++i) { 71 SkRect r; 72 SkPath p; 73 74 r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H, 75 rand.nextUScalar1() * W, rand.nextUScalar1() * H); 76 paint.setColor(rand.nextU()); 77 canvas->drawRect(r, paint); 78 79 r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H, 80 rand.nextUScalar1() * W, rand.nextUScalar1() * H); 81 paint.setColor(rand.nextU()); 82 p.addOval(r); 83 canvas->drawPath(p, paint); 84 85 const SkScalar minx = -SkIntToScalar(W)/4; 86 const SkScalar maxx = 5*SkIntToScalar(W)/4; 87 const SkScalar miny = -SkIntToScalar(H)/4; 88 const SkScalar maxy = 5*SkIntToScalar(H)/4; 89 paint.setColor(rand.nextU()); 90 canvas->drawLine(randRange(rand, minx, maxx), randRange(rand, miny, maxy), 91 randRange(rand, minx, maxx), randRange(rand, miny, maxy), 92 paint); 93 } 94 } 95 96 static void show_hair(SkCanvas* canvas, bool doAA) { 97 show_stroke(canvas, doAA, 0, 150); 98 } 99 100 static void show_thick(SkCanvas* canvas, bool doAA) { 101 show_stroke(canvas, doAA, SkIntToScalar(5), 50); 102 } 103 104 typedef void (*CanvasProc)(SkCanvas*, bool); 105 106 class ClipView : public SampleView { 107 public: 108 ClipView() { 109 SkAAClip clip; 110 SkIRect r = { -2, -3, 842, 18 }; 111 clip.setRect(r); 112 } 113 114 virtual ~ClipView() { 115 } 116 117 protected: 118 // overrides from SkEventSink 119 virtual bool onQuery(SkEvent* evt) { 120 if (SampleCode::TitleQ(*evt)) { 121 SampleCode::TitleR(evt, "Clip"); 122 return true; 123 } 124 return this->INHERITED::onQuery(evt); 125 } 126 127 virtual void onDrawContent(SkCanvas* canvas) { 128 canvas->drawColor(SK_ColorWHITE); 129 canvas->translate(SkIntToScalar(20), SkIntToScalar(20)); 130 131 static const CanvasProc gProc[] = { 132 show_text, show_thick, show_hair, show_fill 133 }; 134 135 SkRect r = { 0, 0, SkIntToScalar(W), SkIntToScalar(H) }; 136 SkPath clipPath; 137 r.inset(SK_Scalar1 / 4, SK_Scalar1 / 4); 138 clipPath.addRoundRect(r, SkIntToScalar(20), SkIntToScalar(20)); 139 140 // clipPath.toggleInverseFillType(); 141 142 for (int aa = 0; aa <= 1; ++aa) { 143 canvas->save(); 144 for (size_t i = 0; i < SK_ARRAY_COUNT(gProc); ++i) { 145 canvas->save(); 146 canvas->clipPath(clipPath, kIntersect_SkClipOp, SkToBool(aa)); 147 // canvas->drawColor(SK_ColorWHITE); 148 gProc[i](canvas, SkToBool(aa)); 149 canvas->restore(); 150 canvas->translate(W * SK_Scalar1 * 8 / 7, 0); 151 } 152 canvas->restore(); 153 canvas->translate(0, H * SK_Scalar1 * 8 / 7); 154 } 155 } 156 157 private: 158 typedef SampleView INHERITED; 159 }; 160 161 ////////////////////////////////////////////////////////////////////////////// 162 163 static SkView* MyFactory() { return new ClipView; } 164 static SkViewRegister reg(MyFactory); 165
