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 "SkAnimTimer.h"
10 #include "SkView.h"
11 #include "SkCanvas.h"
12 #include "SkGradientShader.h"
13 #include "SkPath.h"
14 #include "SkRegion.h"
15 #include "SkShader.h"
16 #include "SkUtils.h"
17 #include "Sk1DPathEffect.h"
18 #include "SkCornerPathEffect.h"
19 #include "SkPathMeasure.h"
20 #include "SkRandom.h"
21 #include "SkColorPriv.h"
22
23 #define CORNER_RADIUS 12
24
25 static const int gXY[] = {
26 4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
27 };
28
make_pe(int flags,SkScalar phase)29 static sk_sp<SkPathEffect> make_pe(int flags, SkScalar phase) {
30 if (flags == 1) {
31 return SkCornerPathEffect::Make(SkIntToScalar(CORNER_RADIUS));
32 }
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 auto outer = SkPath1DPathEffect::Make(path, 12, phase, SkPath1DPathEffect::kRotate_Style);
42
43 if (flags == 2)
44 return outer;
45
46 auto inner = SkCornerPathEffect::Make(SkIntToScalar(CORNER_RADIUS));
47
48 return SkPathEffect::MakeCompose(outer, inner);
49 }
50
make_warp_pe(SkScalar phase)51 static sk_sp<SkPathEffect> make_warp_pe(SkScalar phase) {
52 SkPath path;
53 path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
54 for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2) {
55 path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
56 }
57 path.close();
58 path.offset(SkIntToScalar(-6), 0);
59
60 auto outer = SkPath1DPathEffect::Make(
61 path, 12, phase, SkPath1DPathEffect::kMorph_Style);
62 auto inner = SkCornerPathEffect::Make(SkIntToScalar(CORNER_RADIUS));
63
64 return SkPathEffect::MakeCompose(outer, inner);
65 }
66
67 ///////////////////////////////////////////////////////////
68
69 #include "SkColorFilter.h"
70
71 class PathEffectView : public SampleView {
72 SkPath fPath;
73 SkPoint fClickPt;
74 SkScalar fPhase;
75
76 public:
PathEffectView()77 PathEffectView() : fPhase(0) {
78 }
79
80 protected:
onOnceBeforeDraw()81 void onOnceBeforeDraw() override {
82 SkRandom rand;
83 int steps = 20;
84 SkScalar dist = SkIntToScalar(400);
85 SkScalar x = SkIntToScalar(20);
86 SkScalar y = SkIntToScalar(50);
87
88 fPath.moveTo(x, y);
89 for (int i = 0; i < steps; i++) {
90 x += dist/steps;
91 SkScalar tmpY = y + SkIntToScalar(rand.nextS() % 25);
92 if (i == steps/2) {
93 fPath.moveTo(x, tmpY);
94 } else {
95 fPath.lineTo(x, tmpY);
96 }
97 }
98
99 {
100 SkRect oval;
101 oval.set(SkIntToScalar(20), SkIntToScalar(30),
102 SkIntToScalar(100), SkIntToScalar(60));
103 oval.offset(x, 0);
104 fPath.addRoundRect(oval, SkIntToScalar(8), SkIntToScalar(8));
105 }
106
107 fClickPt.set(SkIntToScalar(200), SkIntToScalar(200));
108
109 this->setBGColor(0xFFDDDDDD);
110 }
111
onQuery(SkEvent * evt)112 bool onQuery(SkEvent* evt) override {
113 if (SampleCode::TitleQ(*evt)) {
114 SampleCode::TitleR(evt, "PathEffects");
115 return true;
116 }
117 return this->INHERITED::onQuery(evt);
118 }
119
onDrawContent(SkCanvas * canvas)120 void onDrawContent(SkCanvas* canvas) override {
121 SkPaint paint;
122
123 canvas->translate(0, 50);
124
125 paint.setColor(SK_ColorBLUE);
126 paint.setPathEffect(make_pe(2, fPhase));
127 canvas->drawPath(fPath, paint);
128
129 canvas->translate(0, 50);
130
131 paint.setARGB(0xFF, 0, 0xBB, 0);
132 paint.setPathEffect(make_pe(3, fPhase));
133 canvas->drawPath(fPath, paint);
134
135 canvas->translate(0, 50);
136
137 paint.setARGB(0xFF, 0, 0, 0);
138 paint.setPathEffect(make_warp_pe(fPhase));
139 canvas->drawPath(fPath, paint);
140 }
141
onAnimate(const SkAnimTimer & timer)142 bool onAnimate(const SkAnimTimer& timer) override {
143 fPhase = timer.scaled(40);
144 return true;
145 }
146
147 private:
148 typedef SampleView INHERITED;
149 };
150
151 //////////////////////////////////////////////////////////////////////////////
152
MyFactory()153 static SkView* MyFactory() { return new PathEffectView; }
154 static SkViewRegister reg(MyFactory);
155