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:
ComplexClipView()15 ComplexClipView() {
16 this->setBGColor(0xFFA0DDA0);
17 }
18
19 protected:
20 // overrides from SkEventSink
onQuery(SkEvent * evt)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
onDrawContent(SkCanvas * canvas)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 int 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
MyFactory()152 static SkView* MyFactory() { return new ComplexClipView; }
153 static SkViewRegister reg(MyFactory);
154
155