1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkAvoidXfermode.h"
///////////////////////////////////////////////////////////////////////////////
class AvoidView : public SampleView {
SkShader* fShader;
enum {
W = 480,
H = 320
};
public:
AvoidView() {
SkColor colors[] = { SK_ColorRED, SK_ColorYELLOW, SK_ColorGREEN, SK_ColorCYAN, SK_ColorBLUE };
#if 0
SkPoint pts[] = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
fShader = SkGradientShader::CreateLinear(pts, colors, NULL,
SK_ARRAY_COUNT(colors),
SkShader::kMirror_TileMode);
#else
SkPoint pts[] = { { SkIntToScalar(W)/2, SkIntToScalar(H)/2 } };
fShader = SkGradientShader::CreateRadial(pts[0], SkIntToScalar(H)/5,
colors, NULL,
SK_ARRAY_COUNT(colors),
SkShader::kMirror_TileMode);
#endif
}
virtual ~AvoidView() {
fShader->unref();
}
protected:
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "AvoidXfermode");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkPaint paint;
SkRect r = { 0, 0, SkIntToScalar(W), SkIntToScalar(H) };
canvas->translate(r.width() / 6, r.height() / 6);
paint.setShader(fShader);
canvas->drawRect(r, paint);
static const struct {
int fTolerance;
SkAvoidXfermode::Mode fMode;
float fDX, fDY;
} gData[] = {
{ 16, SkAvoidXfermode::kAvoidColor_Mode, 0, 0 },
{ 255-16, SkAvoidXfermode::kAvoidColor_Mode, 1, 0 },
{ 16, SkAvoidXfermode::kTargetColor_Mode, 0, 1 },
{ 255-16, SkAvoidXfermode::kTargetColor_Mode, 1, 1 },
};
paint.setShader(NULL);
paint.setColor(SK_ColorMAGENTA);
SkPaint frameP;
frameP.setStyle(SkPaint::kStroke_Style);
for (size_t i = 0; i < SK_ARRAY_COUNT(gData); i++) {
SkAvoidXfermode mode(SK_ColorGREEN, gData[i].fTolerance,
gData[i].fMode);
paint.setXfermode(&mode);
int div = 3;
SkRect rr = { 0, 0, r.width()/div, r.height()/div };
rr.offset(r.width()/4 - rr.width()/2, r.height()/4 - rr.height()/2);
rr.offset(r.width() * gData[i].fDX/2, r.height() * gData[i].fDY/2);
canvas->drawRect(rr, paint);
paint.setXfermode(NULL);
canvas->drawRect(rr, frameP);
}
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() {
return new AvoidView;
}
static SkViewRegister reg(MyFactory);
|
