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:
AvoidView()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
~AvoidView()41 virtual ~AvoidView() {
42 fShader->unref();
43 }
44
45 protected:
onQuery(SkEvent * evt)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
onDrawContent(SkCanvas * canvas)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
MyFactory()101 static SkView* MyFactory() {
102 return new AvoidView;
103 }
104
105 static SkViewRegister reg(MyFactory);
106