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 "SkPath.h"
13 #include "SkRegion.h"
14 #include "SkShader.h"
15 #include "SkUtils.h"
16 #include "Sk1DPathEffect.h"
17 #include "SkCornerPathEffect.h"
18 #include "SkPathMeasure.h"
19 #include "SkRandom.h"
20 #include "SkColorPriv.h"
21 #include "SkPixelXorXfermode.h"
22
23 #define CORNER_RADIUS 12
24 static SkScalar gPhase;
25
26 static const int gXY[] = {
27 4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
28 };
29
make_pe(int flags)30 static SkPathEffect* make_pe(int flags) {
31 if (flags == 1)
32 return new SkCornerPathEffect(SkIntToScalar(CORNER_RADIUS));
33
34 SkPath path;
35 path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
36 for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
37 path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
38 path.close();
39 path.offset(SkIntToScalar(-6), 0);
40
41 SkPathEffect* outer = new SkPath1DPathEffect(path, SkIntToScalar(12), gPhase, SkPath1DPathEffect::kRotate_Style);
42
43 if (flags == 2)
44 return outer;
45
46 SkPathEffect* inner = new SkCornerPathEffect(SkIntToScalar(CORNER_RADIUS));
47
48 SkPathEffect* pe = new SkComposePathEffect(outer, inner);
49 outer->unref();
50 inner->unref();
51 return pe;
52 }
53
make_warp_pe()54 static SkPathEffect* make_warp_pe() {
55 SkPath path;
56 path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
57 for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
58 path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
59 path.close();
60 path.offset(SkIntToScalar(-6), 0);
61
62 SkPathEffect* outer = new SkPath1DPathEffect(path, SkIntToScalar(12), gPhase, SkPath1DPathEffect::kMorph_Style);
63 SkPathEffect* inner = new SkCornerPathEffect(SkIntToScalar(CORNER_RADIUS));
64
65 SkPathEffect* pe = new SkComposePathEffect(outer, inner);
66 outer->unref();
67 inner->unref();
68 return pe;
69 }
70
71 ///////////////////////////////////////////////////////////
72
73 #include "SkColorFilter.h"
74 #include "SkLayerRasterizer.h"
75
76 class testrast : public SkLayerRasterizer {
77 public:
testrast()78 testrast() {
79 SkPaint paint;
80 paint.setAntiAlias(true);
81
82 #if 0
83 paint.setStyle(SkPaint::kStroke_Style);
84 paint.setStrokeWidth(SK_Scalar1*4);
85 this->addLayer(paint);
86
87 paint.setStrokeWidth(SK_Scalar1*1);
88 paint.setXfermode(SkXfermode::kClear_Mode);
89 this->addLayer(paint);
90 #else
91 paint.setAlpha(0x66);
92 this->addLayer(paint, SkIntToScalar(4), SkIntToScalar(4));
93
94 paint.setAlpha(0xFF);
95 this->addLayer(paint);
96 #endif
97 }
98 };
99
100 class PathEffectView : public SampleView {
101 SkPath fPath;
102 SkPoint fClickPt;
103 public:
PathEffectView()104 PathEffectView() {
105 SkRandom rand;
106 int steps = 20;
107 SkScalar dist = SkIntToScalar(400);
108 SkScalar x = SkIntToScalar(20);
109 SkScalar y = SkIntToScalar(50);
110
111 fPath.moveTo(x, y);
112 for (int i = 0; i < steps; i++) {
113 x += dist/steps;
114 SkScalar tmpY = y + SkIntToScalar(rand.nextS() % 25);
115 if (i == steps/2) {
116 fPath.moveTo(x, tmpY);
117 } else {
118 fPath.lineTo(x, tmpY);
119 }
120 }
121
122 {
123 SkRect oval;
124 oval.set(SkIntToScalar(20), SkIntToScalar(30),
125 SkIntToScalar(100), SkIntToScalar(60));
126 oval.offset(x, 0);
127 fPath.addRoundRect(oval, SkIntToScalar(8), SkIntToScalar(8));
128 }
129
130 fClickPt.set(SkIntToScalar(200), SkIntToScalar(200));
131
132 this->setBGColor(0xFFDDDDDD);
133 }
134
135 protected:
136 // overrides from SkEventSink
onQuery(SkEvent * evt)137 virtual bool onQuery(SkEvent* evt) {
138 if (SampleCode::TitleQ(*evt)) {
139 SampleCode::TitleR(evt, "PathEffects");
140 return true;
141 }
142 return this->INHERITED::onQuery(evt);
143 }
144
onDrawContent(SkCanvas * canvas)145 virtual void onDrawContent(SkCanvas* canvas) {
146 gPhase -= SampleCode::GetAnimSecondsDelta() * 40;
147 this->inval(NULL);
148
149 SkPaint paint;
150
151 #if 0
152 paint.setAntiAlias(true);
153 paint.setStyle(SkPaint::kStroke_Style);
154 paint.setStrokeWidth(SkIntToScalar(5));
155 canvas->drawPath(fPath, paint);
156 paint.setStrokeWidth(0);
157
158 paint.setColor(SK_ColorWHITE);
159 paint.setPathEffect(make_pe(1))->unref();
160 canvas->drawPath(fPath, paint);
161 #endif
162
163 canvas->translate(0, SkIntToScalar(50));
164
165 paint.setColor(SK_ColorBLUE);
166 paint.setPathEffect(make_pe(2))->unref();
167 canvas->drawPath(fPath, paint);
168
169 canvas->translate(0, SkIntToScalar(50));
170
171 paint.setARGB(0xFF, 0, 0xBB, 0);
172 paint.setPathEffect(make_pe(3))->unref();
173 canvas->drawPath(fPath, paint);
174
175 canvas->translate(0, SkIntToScalar(50));
176
177 paint.setARGB(0xFF, 0, 0, 0);
178 paint.setPathEffect(make_warp_pe())->unref();
179 paint.setRasterizer(new testrast)->unref();
180 canvas->drawPath(fPath, paint);
181 }
182
183 private:
184 typedef SampleView INHERITED;
185 };
186
187 //////////////////////////////////////////////////////////////////////////////
188
MyFactory()189 static SkView* MyFactory() { return new PathEffectView; }
190 static SkViewRegister reg(MyFactory);
191
192