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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 #include "SkPixelXorXfermode.h"
23 
24 #define CORNER_RADIUS   12
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,SkScalar phase)30 static SkPathEffect* make_pe(int flags, SkScalar phase) {
31     if (flags == 1)
32         return SkCornerPathEffect::Create(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 = SkPath1DPathEffect::Create(path, 12, phase,
42                                                      SkPath1DPathEffect::kRotate_Style);
43 
44     if (flags == 2)
45         return outer;
46 
47     SkPathEffect* inner = SkCornerPathEffect::Create(SkIntToScalar(CORNER_RADIUS));
48 
49     SkPathEffect* pe = SkComposePathEffect::Create(outer, inner);
50     outer->unref();
51     inner->unref();
52     return pe;
53 }
54 
make_warp_pe(SkScalar phase)55 static SkPathEffect* make_warp_pe(SkScalar phase) {
56     SkPath  path;
57     path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
58     for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
59         path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
60     path.close();
61     path.offset(SkIntToScalar(-6), 0);
62 
63     SkPathEffect* outer = SkPath1DPathEffect::Create(
64         path, 12, phase, SkPath1DPathEffect::kMorph_Style);
65     SkPathEffect* inner = SkCornerPathEffect::Create(SkIntToScalar(CORNER_RADIUS));
66 
67     SkPathEffect* pe = SkComposePathEffect::Create(outer, inner);
68     outer->unref();
69     inner->unref();
70     return pe;
71 }
72 
73 ///////////////////////////////////////////////////////////
74 
75 #include "SkColorFilter.h"
76 #include "SkLayerRasterizer.h"
77 
78 class TestRastBuilder : public SkLayerRasterizer::Builder {
79 public:
TestRastBuilder()80     TestRastBuilder() {
81         SkPaint paint;
82         paint.setAntiAlias(true);
83 
84         paint.setAlpha(0x66);
85         this->addLayer(paint, SkIntToScalar(4), SkIntToScalar(4));
86 
87         paint.setAlpha(0xFF);
88         this->addLayer(paint);
89     }
90 };
91 
92 class PathEffectView : public SampleView {
93     SkPath  fPath;
94     SkPoint fClickPt;
95     SkScalar fPhase;
96 
97 public:
PathEffectView()98     PathEffectView() : fPhase(0) {
99         }
100 
101 protected:
onOnceBeforeDraw()102     void onOnceBeforeDraw() override {
103         SkRandom    rand;
104         int         steps = 20;
105         SkScalar    dist = SkIntToScalar(400);
106         SkScalar    x = SkIntToScalar(20);
107         SkScalar    y = SkIntToScalar(50);
108 
109         fPath.moveTo(x, y);
110         for (int i = 0; i < steps; i++) {
111             x += dist/steps;
112             SkScalar tmpY = y + SkIntToScalar(rand.nextS() % 25);
113             if (i == steps/2) {
114                 fPath.moveTo(x, tmpY);
115             } else {
116                 fPath.lineTo(x, tmpY);
117             }
118         }
119 
120         {
121             SkRect  oval;
122             oval.set(SkIntToScalar(20), SkIntToScalar(30),
123                      SkIntToScalar(100), SkIntToScalar(60));
124             oval.offset(x, 0);
125             fPath.addRoundRect(oval, SkIntToScalar(8), SkIntToScalar(8));
126         }
127 
128         fClickPt.set(SkIntToScalar(200), SkIntToScalar(200));
129 
130         this->setBGColor(0xFFDDDDDD);
131     }
132 
onQuery(SkEvent * evt)133     bool onQuery(SkEvent* evt) override {
134         if (SampleCode::TitleQ(*evt)) {
135             SampleCode::TitleR(evt, "PathEffects");
136             return true;
137         }
138         return this->INHERITED::onQuery(evt);
139     }
140 
onDrawContent(SkCanvas * canvas)141     void onDrawContent(SkCanvas* canvas) override {
142         SkPaint paint;
143 
144         canvas->translate(0, 50);
145 
146         paint.setColor(SK_ColorBLUE);
147         paint.setPathEffect(make_pe(2, fPhase))->unref();
148         canvas->drawPath(fPath, paint);
149 
150         canvas->translate(0, 50);
151 
152         paint.setARGB(0xFF, 0, 0xBB, 0);
153         paint.setPathEffect(make_pe(3, fPhase))->unref();
154         canvas->drawPath(fPath, paint);
155 
156         canvas->translate(0, 50);
157 
158         paint.setARGB(0xFF, 0, 0, 0);
159         paint.setPathEffect(make_warp_pe(fPhase))->unref();
160         TestRastBuilder testRastBuilder;
161         paint.setRasterizer(testRastBuilder.detachRasterizer())->unref();
162         canvas->drawPath(fPath, paint);
163     }
164 
onAnimate(const SkAnimTimer & timer)165     bool onAnimate(const SkAnimTimer& timer) override {
166         fPhase = timer.scaled(40);
167         return true;
168     }
169 
170 private:
171     typedef SampleView INHERITED;
172 };
173 
174 //////////////////////////////////////////////////////////////////////////////
175 
MyFactory()176 static SkView* MyFactory() { return new PathEffectView; }
177 static SkViewRegister reg(MyFactory);
178