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 "Sample.h"
9 #include "SkAnimTimer.h"
10 #include "SkColorPriv.h"
11 #include "SkCanvas.h"
12 #include "SkMaskFilter.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 Sample {
26 public:
AnimBlurView()27 AnimBlurView() : fBlurSigma(0), fCircleRadius(100) {}
28
29 protected:
onQuery(Sample::Event * evt)30 bool onQuery(Sample::Event* evt) override {
31 if (Sample::TitleQ(*evt)) {
32 Sample::TitleR(evt, "AnimBlur");
33 return true;
34 }
35 return this->INHERITED::onQuery(evt);
36 }
37
onDrawContent(SkCanvas * canvas)38 void onDrawContent(SkCanvas* canvas) override {
39 static const SkBlurStyle gStyles[] = {
40 kNormal_SkBlurStyle,
41 kInner_SkBlurStyle,
42 kSolid_SkBlurStyle,
43 kOuter_SkBlurStyle,
44 };
45 SkRandom random;
46
47 for (size_t i = 0; i < SK_ARRAY_COUNT(gStyles); ++i) {
48 SkPaint paint;
49 paint.setMaskFilter(SkMaskFilter::MakeBlur(gStyles[i],
50 fBlurSigma));
51 paint.setColor(random.nextU() | 0xff000000);
52 canvas->drawCircle(200 * SK_Scalar1 + 400 * (i % 2) * SK_Scalar1,
53 200 * SK_Scalar1 + i / 2 * 400 * SK_Scalar1,
54 fCircleRadius, paint);
55 }
56 }
57
onAnimate(const SkAnimTimer & timer)58 bool onAnimate(const SkAnimTimer& timer) override {
59 fBlurSigma = get_anim_sin(timer.secs(), 100, 4, 5);
60 fCircleRadius = 3 + get_anim_sin(timer.secs(), 150, 25, 3);
61 return true;
62 }
63
64 private:
65 SkScalar fBlurSigma, fCircleRadius;
66
67 typedef Sample INHERITED;
68 };
69
70 //////////////////////////////////////////////////////////////////////////////
71
72 DEF_SAMPLE( return new AnimBlurView(); )
73