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
|
/*
* 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 "SkColorPriv.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkRandom.h"
#define W 150
#define H 200
static void show_text(SkCanvas* canvas, bool doAA) {
SkRandom rand;
SkPaint paint;
paint.setAntiAlias(doAA);
paint.setLCDRenderText(true);
paint.setTextSize(SkIntToScalar(20));
for (int i = 0; i < 200; ++i) {
paint.setColor((SK_A32_MASK << SK_A32_SHIFT) | rand.nextU());
canvas->drawText("Hamburgefons", 12,
rand.nextSScalar1() * W, rand.nextSScalar1() * H + 20,
paint);
}
}
static void show_fill(SkCanvas* canvas, bool doAA) {
SkRandom rand;
SkPaint paint;
paint.setAntiAlias(doAA);
for (int i = 0; i < 50; ++i) {
SkRect r;
SkPath p;
r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
rand.nextUScalar1() * W, rand.nextUScalar1() * H);
paint.setColor(rand.nextU());
canvas->drawRect(r, paint);
r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
rand.nextUScalar1() * W, rand.nextUScalar1() * H);
paint.setColor(rand.nextU());
p.addOval(r);
canvas->drawPath(p, paint);
}
}
static SkScalar randRange(SkRandom& rand, SkScalar min, SkScalar max) {
SkASSERT(min <= max);
return min + SkScalarMul(rand.nextUScalar1(), max - min);
}
static void show_stroke(SkCanvas* canvas, bool doAA, SkScalar strokeWidth, int n) {
SkRandom rand;
SkPaint paint;
paint.setAntiAlias(doAA);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(strokeWidth);
for (int i = 0; i < n; ++i) {
SkRect r;
SkPath p;
r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
rand.nextUScalar1() * W, rand.nextUScalar1() * H);
paint.setColor(rand.nextU());
canvas->drawRect(r, paint);
r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
rand.nextUScalar1() * W, rand.nextUScalar1() * H);
paint.setColor(rand.nextU());
p.addOval(r);
canvas->drawPath(p, paint);
const SkScalar minx = -SkIntToScalar(W)/4;
const SkScalar maxx = 5*SkIntToScalar(W)/4;
const SkScalar miny = -SkIntToScalar(H)/4;
const SkScalar maxy = 5*SkIntToScalar(H)/4;
paint.setColor(rand.nextU());
canvas->drawLine(randRange(rand, minx, maxx), randRange(rand, miny, maxy),
randRange(rand, minx, maxx), randRange(rand, miny, maxy),
paint);
}
}
static void show_hair(SkCanvas* canvas, bool doAA) {
show_stroke(canvas, doAA, 0, 150);
}
static void show_thick(SkCanvas* canvas, bool doAA) {
show_stroke(canvas, doAA, SkIntToScalar(5), 50);
}
typedef void (*CanvasProc)(SkCanvas*, bool);
#include "SkAAClip.h"
class ClipView : public SampleView {
public:
ClipView() {
SkAAClip clip;
SkIRect r = { -2, -3, 842, 18 };
clip.setRect(r);
}
virtual ~ClipView() {
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Clip");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) {
canvas->drawColor(SK_ColorWHITE);
canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
static const CanvasProc gProc[] = {
show_text, show_thick, show_hair, show_fill
};
SkRect r = { 0, 0, SkIntToScalar(W), SkIntToScalar(H) };
SkPath clipPath;
r.inset(SK_Scalar1 / 4, SK_Scalar1 / 4);
clipPath.addRoundRect(r, SkIntToScalar(20), SkIntToScalar(20));
// clipPath.toggleInverseFillType();
for (int aa = 0; aa <= 1; ++aa) {
canvas->save();
for (size_t i = 0; i < SK_ARRAY_COUNT(gProc); ++i) {
canvas->save();
canvas->clipPath(clipPath, SkRegion::kIntersect_Op, SkToBool(aa));
// canvas->drawColor(SK_ColorWHITE);
gProc[i](canvas, SkToBool(aa));
canvas->restore();
canvas->translate(W * SK_Scalar1 * 8 / 7, 0);
}
canvas->restore();
canvas->translate(0, H * SK_Scalar1 * 8 / 7);
}
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new ClipView; }
static SkViewRegister reg(MyFactory);
|
