1 /*
2 * Copyright 2012 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 "SkBlurMaskFilter.h"
11 #include "SkColorPriv.h"
12 #include "SkCanvas.h"
13 #include "SkRandom.h"
14
get_anim_sin(double secs,SkScalar amplitude,SkScalar periodInSec,SkScalar phaseInSec)15 SkScalar get_anim_sin(double secs, SkScalar amplitude, SkScalar periodInSec, SkScalar phaseInSec) {
16 if (!periodInSec) {
17 return 0;
18 }
19 double t = secs + phaseInSec;
20 t *= SkScalarToFloat(2 * SK_ScalarPI) / periodInSec;
21 amplitude = SK_ScalarHalf * amplitude;
22 return amplitude * SkDoubleToScalar(sin(t)) + amplitude;
23 }
24
25 class AnimBlurView : public SampleView {
26 public:
AnimBlurView()27 AnimBlurView() : fBlurSigma(0), fCircleRadius(100) {}
28
29 protected:
30 // overrides from SkEventSink
onQuery(SkEvent * evt)31 bool onQuery(SkEvent* evt) override {
32 if (SampleCode::TitleQ(*evt)) {
33 SampleCode::TitleR(evt, "AnimBlur");
34 return true;
35 }
36 return this->INHERITED::onQuery(evt);
37 }
38
onDrawContent(SkCanvas * canvas)39 void onDrawContent(SkCanvas* canvas) override {
40 static const SkBlurStyle gStyles[] = {
41 kNormal_SkBlurStyle,
42 kInner_SkBlurStyle,
43 kSolid_SkBlurStyle,
44 kOuter_SkBlurStyle,
45 };
46 SkRandom random;
47
48 for (size_t i = 0; i < SK_ARRAY_COUNT(gStyles); ++i) {
49 SkMaskFilter* mf = SkBlurMaskFilter::Create(
50 gStyles[i],
51 fBlurSigma,
52 SkBlurMaskFilter::kHighQuality_BlurFlag);
53 SkPaint paint;
54 SkSafeUnref(paint.setMaskFilter(mf));
55 paint.setColor(random.nextU() | 0xff000000);
56 canvas->drawCircle(200 * SK_Scalar1 + 400 * (i % 2) * SK_Scalar1,
57 200 * SK_Scalar1 + i / 2 * 400 * SK_Scalar1,
58 fCircleRadius, paint);
59 }
60 }
61
onAnimate(const SkAnimTimer & timer)62 bool onAnimate(const SkAnimTimer& timer) override {
63 fBlurSigma = get_anim_sin(timer.secs(), 100, 4, 5);
64 fCircleRadius = 3 + get_anim_sin(timer.secs(), 150, 25, 3);
65 return true;
66 }
67
68 private:
69 SkScalar fBlurSigma, fCircleRadius;
70
71 typedef SampleView INHERITED;
72 };
73
74 //////////////////////////////////////////////////////////////////////////////
75
MyFactory()76 static SkView* MyFactory() { return new AnimBlurView; }
77 static SkViewRegister reg(MyFactory);
78