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 "include/core/SkCanvas.h"
9 #include "include/core/SkColorPriv.h"
10 #include "include/core/SkPath.h"
11 #include "include/core/SkPathMeasure.h"
12 #include "include/core/SkRegion.h"
13 #include "include/core/SkShader.h"
14 #include "include/effects/Sk1DPathEffect.h"
15 #include "include/effects/SkCornerPathEffect.h"
16 #include "include/effects/SkGradientShader.h"
17 #include "include/utils/SkRandom.h"
18 #include "samplecode/Sample.h"
19 #include "src/utils/SkUTF.h"
20 #include "tools/timer/TimeUtils.h"
21
22 #define CORNER_RADIUS 12
23
24 static const int gXY[] = {
25 4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
26 };
27
make_pe(int flags,SkScalar phase)28 static sk_sp<SkPathEffect> make_pe(int flags, SkScalar phase) {
29 if (flags == 1) {
30 return SkCornerPathEffect::Make(SkIntToScalar(CORNER_RADIUS));
31 }
32
33 SkPath path;
34 path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
35 for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
36 path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
37 path.close();
38 path.offset(SkIntToScalar(-6), 0);
39
40 auto outer = SkPath1DPathEffect::Make(path, 12, phase, SkPath1DPathEffect::kRotate_Style);
41
42 if (flags == 2)
43 return outer;
44
45 auto inner = SkCornerPathEffect::Make(SkIntToScalar(CORNER_RADIUS));
46
47 return SkPathEffect::MakeCompose(outer, inner);
48 }
49
make_warp_pe(SkScalar phase)50 static sk_sp<SkPathEffect> make_warp_pe(SkScalar phase) {
51 SkPath path;
52 path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
53 for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2) {
54 path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
55 }
56 path.close();
57 path.offset(SkIntToScalar(-6), 0);
58
59 auto outer = SkPath1DPathEffect::Make(
60 path, 12, phase, SkPath1DPathEffect::kMorph_Style);
61 auto inner = SkCornerPathEffect::Make(SkIntToScalar(CORNER_RADIUS));
62
63 return SkPathEffect::MakeCompose(outer, inner);
64 }
65
66 ///////////////////////////////////////////////////////////
67
68 #include "include/core/SkColorFilter.h"
69
70 class PathEffectView : public Sample {
71 SkPath fPath;
72 SkPoint fClickPt;
73 SkScalar fPhase;
74
75 public:
PathEffectView()76 PathEffectView() : fPhase(0) {
77 }
78
79 protected:
onOnceBeforeDraw()80 void onOnceBeforeDraw() override {
81 SkRandom rand;
82 int steps = 20;
83 SkScalar dist = SkIntToScalar(400);
84 SkScalar x = SkIntToScalar(20);
85 SkScalar y = SkIntToScalar(50);
86
87 fPath.moveTo(x, y);
88 for (int i = 0; i < steps; i++) {
89 x += dist/steps;
90 SkScalar tmpY = y + SkIntToScalar(rand.nextS() % 25);
91 if (i == steps/2) {
92 fPath.moveTo(x, tmpY);
93 } else {
94 fPath.lineTo(x, tmpY);
95 }
96 }
97
98 {
99 SkRect oval;
100 oval.setLTRB(20, 30, 100, 60);
101 oval.offset(x, 0);
102 fPath.addRoundRect(oval, SkIntToScalar(8), SkIntToScalar(8));
103 }
104
105 fClickPt.set(SkIntToScalar(200), SkIntToScalar(200));
106
107 this->setBGColor(0xFFDDDDDD);
108 }
109
name()110 SkString name() override { return SkString("PathEffects"); }
111
onDrawContent(SkCanvas * canvas)112 void onDrawContent(SkCanvas* canvas) override {
113 SkPaint paint;
114
115 canvas->translate(0, 50);
116
117 paint.setColor(SK_ColorBLUE);
118 paint.setPathEffect(make_pe(2, fPhase));
119 canvas->drawPath(fPath, paint);
120
121 canvas->translate(0, 50);
122
123 paint.setARGB(0xFF, 0, 0xBB, 0);
124 paint.setPathEffect(make_pe(3, fPhase));
125 canvas->drawPath(fPath, paint);
126
127 canvas->translate(0, 50);
128
129 paint.setARGB(0xFF, 0, 0, 0);
130 paint.setPathEffect(make_warp_pe(fPhase));
131 canvas->drawPath(fPath, paint);
132 }
133
onAnimate(double nanos)134 bool onAnimate(double nanos) override {
135 fPhase = TimeUtils::Scaled(1e-9 * nanos, 40);
136 return true;
137 }
138
139 private:
140 typedef Sample INHERITED;
141 };
142
143 //////////////////////////////////////////////////////////////////////////////
144
145 DEF_SAMPLE( return new PathEffectView(); )
146