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 SkPaint paint;
50 paint.setMaskFilter(SkBlurMaskFilter::Make(gStyles[i],
51 fBlurSigma,
52 SkBlurMaskFilter::kHighQuality_BlurFlag));
53 paint.setColor(random.nextU() | 0xff000000);
54 canvas->drawCircle(200 * SK_Scalar1 + 400 * (i % 2) * SK_Scalar1,
55 200 * SK_Scalar1 + i / 2 * 400 * SK_Scalar1,
56 fCircleRadius, paint);
57 }
58 }
59
onAnimate(const SkAnimTimer & timer)60 bool onAnimate(const SkAnimTimer& timer) override {
61 fBlurSigma = get_anim_sin(timer.secs(), 100, 4, 5);
62 fCircleRadius = 3 + get_anim_sin(timer.secs(), 150, 25, 3);
63 return true;
64 }
65
66 private:
67 SkScalar fBlurSigma, fCircleRadius;
68
69 typedef SampleView INHERITED;
70 };
71
72 //////////////////////////////////////////////////////////////////////////////
73
MyFactory()74 static SkView* MyFactory() { return new AnimBlurView; }
75 static SkViewRegister reg(MyFactory);
76