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 "SkAnimTimer.h" 10 #include "SkView.h" 11 #include "SkCanvas.h" 12 #include "SkGradientShader.h" 13 #include "SkPath.h" 14 #include "SkRegion.h" 15 #include "SkShader.h" 16 #include "SkUtils.h" 17 #include "Sk1DPathEffect.h" 18 #include "SkCornerPathEffect.h" 19 #include "SkPathMeasure.h" 20 #include "SkRandom.h" 21 #include "SkColorPriv.h" 22 23 #define CORNER_RADIUS 12 24 25 static const int gXY[] = { 26 4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4 27 }; 28 29 static sk_sp<SkPathEffect> make_pe(int flags, SkScalar phase) { 30 if (flags == 1) { 31 return SkCornerPathEffect::Make(SkIntToScalar(CORNER_RADIUS)); 32 } 33 34 SkPath path; 35 path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1])); 36 for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2) 37 path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1])); 38 path.close(); 39 path.offset(SkIntToScalar(-6), 0); 40 41 auto outer = SkPath1DPathEffect::Make(path, 12, phase, SkPath1DPathEffect::kRotate_Style); 42 43 if (flags == 2) 44 return outer; 45 46 auto inner = SkCornerPathEffect::Make(SkIntToScalar(CORNER_RADIUS)); 47 48 return SkPathEffect::MakeCompose(outer, inner); 49 } 50 51 static sk_sp<SkPathEffect> make_warp_pe(SkScalar phase) { 52 SkPath path; 53 path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1])); 54 for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2) { 55 path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1])); 56 } 57 path.close(); 58 path.offset(SkIntToScalar(-6), 0); 59 60 auto outer = SkPath1DPathEffect::Make( 61 path, 12, phase, SkPath1DPathEffect::kMorph_Style); 62 auto inner = SkCornerPathEffect::Make(SkIntToScalar(CORNER_RADIUS)); 63 64 return SkPathEffect::MakeCompose(outer, inner); 65 } 66 67 /////////////////////////////////////////////////////////// 68 69 #include "SkColorFilter.h" 70 71 class PathEffectView : public SampleView { 72 SkPath fPath; 73 SkPoint fClickPt; 74 SkScalar fPhase; 75 76 public: 77 PathEffectView() : fPhase(0) { 78 } 79 80 protected: 81 void onOnceBeforeDraw() override { 82 SkRandom rand; 83 int steps = 20; 84 SkScalar dist = SkIntToScalar(400); 85 SkScalar x = SkIntToScalar(20); 86 SkScalar y = SkIntToScalar(50); 87 88 fPath.moveTo(x, y); 89 for (int i = 0; i < steps; i++) { 90 x += dist/steps; 91 SkScalar tmpY = y + SkIntToScalar(rand.nextS() % 25); 92 if (i == steps/2) { 93 fPath.moveTo(x, tmpY); 94 } else { 95 fPath.lineTo(x, tmpY); 96 } 97 } 98 99 { 100 SkRect oval; 101 oval.set(SkIntToScalar(20), SkIntToScalar(30), 102 SkIntToScalar(100), SkIntToScalar(60)); 103 oval.offset(x, 0); 104 fPath.addRoundRect(oval, SkIntToScalar(8), SkIntToScalar(8)); 105 } 106 107 fClickPt.set(SkIntToScalar(200), SkIntToScalar(200)); 108 109 this->setBGColor(0xFFDDDDDD); 110 } 111 112 bool onQuery(SkEvent* evt) override { 113 if (SampleCode::TitleQ(*evt)) { 114 SampleCode::TitleR(evt, "PathEffects"); 115 return true; 116 } 117 return this->INHERITED::onQuery(evt); 118 } 119 120 void onDrawContent(SkCanvas* canvas) override { 121 SkPaint paint; 122 123 canvas->translate(0, 50); 124 125 paint.setColor(SK_ColorBLUE); 126 paint.setPathEffect(make_pe(2, fPhase)); 127 canvas->drawPath(fPath, paint); 128 129 canvas->translate(0, 50); 130 131 paint.setARGB(0xFF, 0, 0xBB, 0); 132 paint.setPathEffect(make_pe(3, fPhase)); 133 canvas->drawPath(fPath, paint); 134 135 canvas->translate(0, 50); 136 137 paint.setARGB(0xFF, 0, 0, 0); 138 paint.setPathEffect(make_warp_pe(fPhase)); 139 canvas->drawPath(fPath, paint); 140 } 141 142 bool onAnimate(const SkAnimTimer& timer) override { 143 fPhase = timer.scaled(40); 144 return true; 145 } 146 147 private: 148 typedef SampleView INHERITED; 149 }; 150 151 ////////////////////////////////////////////////////////////////////////////// 152 153 static SkView* MyFactory() { return new PathEffectView; } 154 static SkViewRegister reg(MyFactory); 155
