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 "SampleCode.h" 9 #include "SkView.h" 10 #include "SkCanvas.h" 11 #include "SkGradientShader.h" 12 #include "SkAvoidXfermode.h" 13 14 /////////////////////////////////////////////////////////////////////////////// 15 16 class AvoidView : public SampleView { 17 SkShader* fShader; 18 19 enum { 20 W = 480, 21 H = 320 22 }; 23 public: 24 AvoidView() { 25 SkColor colors[] = { SK_ColorRED, SK_ColorYELLOW, SK_ColorGREEN, SK_ColorCYAN, SK_ColorBLUE }; 26 27 #if 0 28 SkPoint pts[] = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) }; 29 fShader = SkGradientShader::CreateLinear(pts, colors, NULL, 30 SK_ARRAY_COUNT(colors), 31 SkShader::kMirror_TileMode); 32 #else 33 SkPoint pts[] = { { SkIntToScalar(W)/2, SkIntToScalar(H)/2 } }; 34 fShader = SkGradientShader::CreateRadial(pts[0], SkIntToScalar(H)/5, 35 colors, NULL, 36 SK_ARRAY_COUNT(colors), 37 SkShader::kMirror_TileMode); 38 #endif 39 } 40 41 virtual ~AvoidView() { 42 fShader->unref(); 43 } 44 45 protected: 46 virtual bool onQuery(SkEvent* evt) { 47 if (SampleCode::TitleQ(*evt)) { 48 SampleCode::TitleR(evt, "AvoidXfermode"); 49 return true; 50 } 51 return this->INHERITED::onQuery(evt); 52 } 53 54 virtual void onDrawContent(SkCanvas* canvas) { 55 SkPaint paint; 56 SkRect r = { 0, 0, SkIntToScalar(W), SkIntToScalar(H) }; 57 58 canvas->translate(r.width() / 6, r.height() / 6); 59 60 paint.setShader(fShader); 61 canvas->drawRect(r, paint); 62 63 static const struct { 64 int fTolerance; 65 SkAvoidXfermode::Mode fMode; 66 float fDX, fDY; 67 } gData[] = { 68 { 16, SkAvoidXfermode::kAvoidColor_Mode, 0, 0 }, 69 { 255-16, SkAvoidXfermode::kAvoidColor_Mode, 1, 0 }, 70 { 16, SkAvoidXfermode::kTargetColor_Mode, 0, 1 }, 71 { 255-16, SkAvoidXfermode::kTargetColor_Mode, 1, 1 }, 72 }; 73 74 paint.setShader(NULL); 75 paint.setColor(SK_ColorMAGENTA); 76 77 SkPaint frameP; 78 frameP.setStyle(SkPaint::kStroke_Style); 79 80 for (size_t i = 0; i < SK_ARRAY_COUNT(gData); i++) { 81 SkAutoTUnref<SkAvoidXfermode> mode(SkAvoidXfermode::Create( 82 SK_ColorGREEN, gData[i].fTolerance, gData[i].fMode)); 83 paint.setXfermode(mode); 84 int div = 3; 85 SkRect rr = { 0, 0, r.width()/div, r.height()/div }; 86 rr.offset(r.width()/4 - rr.width()/2, r.height()/4 - rr.height()/2); 87 rr.offset(r.width() * gData[i].fDX/2, r.height() * gData[i].fDY/2); 88 canvas->drawRect(rr, paint); 89 paint.setXfermode(NULL); 90 91 canvas->drawRect(rr, frameP); 92 } 93 } 94 95 private: 96 typedef SampleView INHERITED; 97 }; 98 99 ////////////////////////////////////////////////////////////////////////////// 100 101 static SkView* MyFactory() { 102 return new AvoidView; 103 } 104 105 static SkViewRegister reg(MyFactory); 106
