1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SampleCode.h"
9 #include "SkView.h"
10 #include "SkCanvas.h"
11 #include "SkColorPriv.h"
12 #include "SkDevice.h"
13 #include "SkPaint.h"
14 #include "SkRandom.h"
15
16 #define W 150
17 #define H 200
18
show_text(SkCanvas * canvas,bool doAA)19 static void show_text(SkCanvas* canvas, bool doAA) {
20 SkRandom rand;
21 SkPaint paint;
22 paint.setAntiAlias(doAA);
23 paint.setLCDRenderText(true);
24 paint.setTextSize(SkIntToScalar(20));
25
26 for (int i = 0; i < 200; ++i) {
27 paint.setColor((SK_A32_MASK << SK_A32_SHIFT) | rand.nextU());
28 canvas->drawText("Hamburgefons", 12,
29 rand.nextSScalar1() * W, rand.nextSScalar1() * H + 20,
30 paint);
31 }
32 }
33
valid(int i)34 static bool valid(int i) {
35 return i < 15 && i > 7;
36 }
37
show_fill(SkCanvas * canvas,bool doAA)38 static void show_fill(SkCanvas* canvas, bool doAA) {
39 SkRandom rand;
40 SkPaint paint;
41 paint.setAntiAlias(doAA);
42
43 for (int i = 0; i < 50; ++i) {
44 SkRect r;
45 SkPath p;
46
47 r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
48 rand.nextUScalar1() * W, rand.nextUScalar1() * H);
49 paint.setColor(rand.nextU());
50 canvas->drawRect(r, paint);
51
52 r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
53 rand.nextUScalar1() * W, rand.nextUScalar1() * H);
54 paint.setColor(rand.nextU());
55 p.addOval(r);
56 canvas->drawPath(p, paint);
57 }
58 }
59
randRange(SkRandom & rand,SkScalar min,SkScalar max)60 static SkScalar randRange(SkRandom& rand, SkScalar min, SkScalar max) {
61 SkASSERT(min <= max);
62 return min + SkScalarMul(rand.nextUScalar1(), max - min);
63 }
64
show_stroke(SkCanvas * canvas,bool doAA,SkScalar strokeWidth,int n)65 static void show_stroke(SkCanvas* canvas, bool doAA, SkScalar strokeWidth, int n) {
66 SkRandom rand;
67 SkPaint paint;
68 paint.setAntiAlias(doAA);
69 paint.setStyle(SkPaint::kStroke_Style);
70 paint.setStrokeWidth(strokeWidth);
71
72 for (int i = 0; i < n; ++i) {
73 SkRect r;
74 SkPath p;
75
76 r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
77 rand.nextUScalar1() * W, rand.nextUScalar1() * H);
78 paint.setColor(rand.nextU());
79 canvas->drawRect(r, paint);
80
81 r.setXYWH(rand.nextSScalar1() * W, rand.nextSScalar1() * H,
82 rand.nextUScalar1() * W, rand.nextUScalar1() * H);
83 paint.setColor(rand.nextU());
84 p.addOval(r);
85 canvas->drawPath(p, paint);
86
87 const SkScalar minx = -SkIntToScalar(W)/4;
88 const SkScalar maxx = 5*SkIntToScalar(W)/4;
89 const SkScalar miny = -SkIntToScalar(H)/4;
90 const SkScalar maxy = 5*SkIntToScalar(H)/4;
91 paint.setColor(rand.nextU());
92 canvas->drawLine(randRange(rand, minx, maxx), randRange(rand, miny, maxy),
93 randRange(rand, minx, maxx), randRange(rand, miny, maxy),
94 paint);
95 }
96 }
97
show_hair(SkCanvas * canvas,bool doAA)98 static void show_hair(SkCanvas* canvas, bool doAA) {
99 show_stroke(canvas, doAA, 0, 150);
100 }
101
show_thick(SkCanvas * canvas,bool doAA)102 static void show_thick(SkCanvas* canvas, bool doAA) {
103 show_stroke(canvas, doAA, SkIntToScalar(5), 50);
104 }
105
106 typedef void (*CanvasProc)(SkCanvas*, bool);
107
108 #include "SkAAClip.h"
109
110 class ClipView : public SampleView {
111 public:
ClipView()112 ClipView() {
113 SkAAClip clip;
114 SkIRect r = { -2, -3, 842, 18 };
115 clip.setRect(r);
116 }
117
~ClipView()118 virtual ~ClipView() {
119 }
120
121 protected:
122 // overrides from SkEventSink
onQuery(SkEvent * evt)123 virtual bool onQuery(SkEvent* evt) {
124 if (SampleCode::TitleQ(*evt)) {
125 SampleCode::TitleR(evt, "Clip");
126 return true;
127 }
128 return this->INHERITED::onQuery(evt);
129 }
130
onDrawContent(SkCanvas * canvas)131 virtual void onDrawContent(SkCanvas* canvas) {
132 canvas->drawColor(SK_ColorWHITE);
133 canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
134
135 static const CanvasProc gProc[] = {
136 show_text, show_thick, show_hair, show_fill
137 };
138
139 SkRect r = { 0, 0, SkIntToScalar(W), SkIntToScalar(H) };
140 SkPath clipPath;
141 r.inset(SK_Scalar1 / 4, SK_Scalar1 / 4);
142 clipPath.addRoundRect(r, SkIntToScalar(20), SkIntToScalar(20));
143
144 // clipPath.toggleInverseFillType();
145
146 for (int aa = 0; aa <= 1; ++aa) {
147 canvas->save();
148 for (size_t i = 0; i < SK_ARRAY_COUNT(gProc); ++i) {
149 canvas->save();
150 canvas->clipPath(clipPath, SkRegion::kIntersect_Op, true);
151 // canvas->drawColor(SK_ColorWHITE);
152 gProc[i](canvas, SkToBool(aa));
153 canvas->restore();
154 canvas->translate(W * SK_Scalar1 * 8 / 7, 0);
155 }
156 canvas->restore();
157 canvas->translate(0, H * SK_Scalar1 * 8 / 7);
158 }
159 }
160
161 private:
162 typedef SampleView INHERITED;
163 };
164
165 //////////////////////////////////////////////////////////////////////////////
166
MyFactory()167 static SkView* MyFactory() { return new ClipView; }
168 static SkViewRegister reg(MyFactory);
169
170