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
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
* 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"
static SkShader* setgrad(const SkRect& r, SkColor c0, SkColor c1) {
SkColor colors[] = { c0, c1 };
SkPoint pts[] = { { r.fLeft, r.fTop }, { r.fRight, r.fTop } };
return SkGradientShader::CreateLinear(pts, colors, NULL, 2,
SkShader::kClamp_TileMode, NULL);
}
static void test_alphagradients(SkCanvas* canvas) {
SkRect r;
r.set(SkIntToScalar(10), SkIntToScalar(10),
SkIntToScalar(410), SkIntToScalar(30));
SkPaint p, p2;
p2.setStyle(SkPaint::kStroke_Style);
p.setShader(setgrad(r, 0xFF00FF00, 0x0000FF00))->unref();
canvas->drawRect(r, p);
canvas->drawRect(r, p2);
r.offset(0, r.height() + SkIntToScalar(4));
p.setShader(setgrad(r, 0xFF00FF00, 0x00000000))->unref();
canvas->drawRect(r, p);
canvas->drawRect(r, p2);
r.offset(0, r.height() + SkIntToScalar(4));
p.setShader(setgrad(r, 0xFF00FF00, 0x00FF0000))->unref();
canvas->drawRect(r, p);
canvas->drawRect(r, p2);
}
///////////////////////////////////////////////////////////////////////////////
struct GradData {
int fCount;
const SkColor* fColors;
const SkScalar* fPos;
};
static const SkColor gColors[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
};
static const SkScalar gPos0[] = { 0, SK_Scalar1 };
static const SkScalar gPos1[] = { SK_Scalar1/4, SK_Scalar1*3/4 };
static const SkScalar gPos2[] = {
0, SK_Scalar1/8, SK_Scalar1/2, SK_Scalar1*7/8, SK_Scalar1
};
static const GradData gGradData[] = {
{ 2, gColors, NULL },
{ 2, gColors, gPos0 },
{ 2, gColors, gPos1 },
{ 5, gColors, NULL },
{ 5, gColors, gPos2 }
};
static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
data.fCount, tm, mapper);
}
static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
SkPoint center;
center.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
data.fPos, data.fCount, tm, mapper);
}
static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
SkPoint center;
center.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
data.fPos, data.fCount, mapper);
}
static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
SkPoint center0, center1;
center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
return SkGradientShader::CreateTwoPointRadial(
center1, (pts[1].fX - pts[0].fX) / 7,
center0, (pts[1].fX - pts[0].fX) / 2,
data.fColors, data.fPos, data.fCount, tm, mapper);
}
static SkShader* Make2RadialConcentric(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
SkPoint center;
center.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
return SkGradientShader::CreateTwoPointRadial(
center, (pts[1].fX - pts[0].fX) / 7,
center, (pts[1].fX - pts[0].fX) / 2,
data.fColors, data.fPos, data.fCount, tm, mapper);
}
typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper);
static const GradMaker gGradMakers[] = {
MakeLinear, MakeRadial, MakeSweep, Make2Radial, Make2RadialConcentric
};
///////////////////////////////////////////////////////////////////////////////
class GradientsView : public SampleView {
public:
GradientsView() {
this->setBGColor(0xFFDDDDDD);
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Gradients");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkPoint pts[2] = {
{ 0, 0 },
{ SkIntToScalar(100), SkIntToScalar(100) }
};
SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
SkPaint paint;
paint.setDither(true);
canvas->save();
canvas->translate(SkIntToScalar(20), SkIntToScalar(10));
for (int tm = 0; tm < SkShader::kTileModeCount; ++tm) {
canvas->save();
for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
canvas->save();
for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
SkShader* shader;
shader = gGradMakers[j](pts, gGradData[i], (SkShader::TileMode)tm, NULL);
paint.setShader(shader)->unref();
canvas->drawRect(r, paint);
canvas->translate(0, SkIntToScalar(120));
}
canvas->restore();
canvas->translate(SkIntToScalar(120), 0);
}
canvas->restore();
canvas->translate(SK_ARRAY_COUNT(gGradData)*SkIntToScalar(120), 0);
}
canvas->restore();
canvas->translate(0, SkIntToScalar(370));
// test_alphagradients(canvas);
this->inval(NULL);
}
private:
typedef SampleView INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new GradientsView; }
static SkViewRegister reg(MyFactory);
|
