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 "SkCanvas.h" 10 #include "SkPath.h" 11 #include "SkView.h" 12 13 class ComplexClipView : public SampleView { 14 public: 15 ComplexClipView() { 16 this->setBGColor(0xFFA0DDA0); 17 } 18 19 protected: 20 // overrides from SkEventSink 21 virtual bool onQuery(SkEvent* evt) { 22 if (SampleCode::TitleQ(*evt)) { 23 SampleCode::TitleR(evt, "ComplexClip"); 24 return true; 25 } 26 return this->INHERITED::onQuery(evt); 27 } 28 29 virtual void onDrawContent(SkCanvas* canvas) { 30 SkPath path; 31 path.moveTo(SkIntToScalar(0), SkIntToScalar(50)); 32 path.quadTo(SkIntToScalar(0), SkIntToScalar(0), SkIntToScalar(50), SkIntToScalar(0)); 33 path.lineTo(SkIntToScalar(175), SkIntToScalar(0)); 34 path.quadTo(SkIntToScalar(200), SkIntToScalar(0), SkIntToScalar(200), SkIntToScalar(25)); 35 path.lineTo(SkIntToScalar(200), SkIntToScalar(150)); 36 path.quadTo(SkIntToScalar(200), SkIntToScalar(200), SkIntToScalar(150), SkIntToScalar(200)); 37 path.lineTo(SkIntToScalar(0), SkIntToScalar(200)); 38 path.close(); 39 path.moveTo(SkIntToScalar(50), SkIntToScalar(50)); 40 path.lineTo(SkIntToScalar(150), SkIntToScalar(50)); 41 path.lineTo(SkIntToScalar(150), SkIntToScalar(125)); 42 path.quadTo(SkIntToScalar(150), SkIntToScalar(150), SkIntToScalar(125), SkIntToScalar(150)); 43 path.lineTo(SkIntToScalar(50), SkIntToScalar(150)); 44 path.close(); 45 path.setFillType(SkPath::kEvenOdd_FillType); 46 SkColor pathColor = SK_ColorBLACK; 47 SkPaint pathPaint; 48 pathPaint.setAntiAlias(true); 49 pathPaint.setColor(pathColor); 50 51 SkPath clipA; 52 clipA.moveTo(SkIntToScalar(10), SkIntToScalar(20)); 53 clipA.lineTo(SkIntToScalar(165), SkIntToScalar(22)); 54 clipA.lineTo(SkIntToScalar(70), SkIntToScalar(105)); 55 clipA.lineTo(SkIntToScalar(165), SkIntToScalar(177)); 56 clipA.lineTo(SkIntToScalar(-5), SkIntToScalar(180)); 57 clipA.close(); 58 SkColor colorA = SK_ColorCYAN; 59 60 SkPath clipB; 61 clipB.moveTo(SkIntToScalar(40), SkIntToScalar(10)); 62 clipB.lineTo(SkIntToScalar(190), SkIntToScalar(15)); 63 clipB.lineTo(SkIntToScalar(195), SkIntToScalar(190)); 64 clipB.lineTo(SkIntToScalar(40), SkIntToScalar(185)); 65 clipB.lineTo(SkIntToScalar(155), SkIntToScalar(100)); 66 clipB.close(); 67 SkColor colorB = SK_ColorRED; 68 69 SkPaint paint; 70 paint.setAntiAlias(true); 71 72 paint.setStyle(SkPaint::kStroke_Style); 73 paint.setStrokeWidth(0); 74 75 canvas->translate(SkIntToScalar(10),SkIntToScalar(10)); 76 canvas->drawPath(path, pathPaint); 77 paint.setColor(colorA); 78 canvas->drawPath(clipA, paint); 79 paint.setColor(colorB); 80 canvas->drawPath(clipB, paint); 81 82 static const struct { 83 SkRegion::Op fOp; 84 const char* fName; 85 } gOps[] = { //extra spaces in names for measureText 86 {SkRegion::kIntersect_Op, "Isect "}, 87 {SkRegion::kDifference_Op, "Diff " }, 88 {SkRegion::kUnion_Op, "Union "}, 89 {SkRegion::kXOR_Op, "Xor " }, 90 {SkRegion::kReverseDifference_Op, "RDiff "} 91 }; 92 93 canvas->translate(0, SkIntToScalar(40)); 94 canvas->scale(3 * SK_Scalar1 / 4, 3 * SK_Scalar1 / 4); 95 canvas->save(); 96 97 for (int invA = 0; invA < 2; ++invA) { 98 for (size_t op = 0; op < SK_ARRAY_COUNT(gOps); ++op) { 99 size_t idx = invA * SK_ARRAY_COUNT(gOps) + op; 100 if (!(idx % 3)) { 101 canvas->restore(); 102 canvas->translate(0, SkIntToScalar(250)); 103 canvas->save(); 104 } 105 canvas->save(); 106 // set clip 107 clipA.setFillType(invA ? SkPath::kInverseEvenOdd_FillType : 108 SkPath::kEvenOdd_FillType); 109 canvas->clipPath(clipA); 110 canvas->clipPath(clipB, gOps[op].fOp); 111 112 // draw path clipped 113 canvas->drawPath(path, pathPaint); 114 canvas->restore(); 115 116 // draw path in hairline 117 paint.setColor(pathColor); 118 canvas->drawPath(path, paint); 119 120 // draw clips in hair line 121 paint.setColor(colorA); 122 canvas->drawPath(clipA, paint); 123 paint.setColor(colorB); 124 canvas->drawPath(clipB, paint); 125 126 paint.setTextSize(SkIntToScalar(20)); 127 128 SkScalar txtX = SkIntToScalar(55); 129 paint.setColor(colorA); 130 const char* aTxt = invA ? "InverseA " : "A "; 131 canvas->drawText(aTxt, strlen(aTxt), txtX, SkIntToScalar(220), paint); 132 txtX += paint.measureText(aTxt, strlen(aTxt)); 133 paint.setColor(SK_ColorBLACK); 134 canvas->drawText(gOps[op].fName, strlen(gOps[op].fName), 135 txtX, SkIntToScalar(220), paint); 136 txtX += paint.measureText(gOps[op].fName, strlen(gOps[op].fName)); 137 paint.setColor(colorB); 138 canvas->drawText("B", 1, txtX, SkIntToScalar(220), paint); 139 140 canvas->translate(SkIntToScalar(250),0); 141 } 142 } 143 canvas->restore(); 144 } 145 146 private: 147 typedef SampleView INHERITED; 148 }; 149 150 ////////////////////////////////////////////////////////////////////////////// 151 152 static SkView* MyFactory() { return new ComplexClipView; } 153 static SkViewRegister reg(MyFactory); 154
