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
15SkScalar 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
25class AnimBlurView : public SampleView {
26public:
27    AnimBlurView() : fBlurSigma(0), fCircleRadius(100) {}
28
29protected:
30    // overrides from SkEventSink
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
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
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
66private:
67    SkScalar fBlurSigma, fCircleRadius;
68
69    typedef SampleView INHERITED;
70};
71
72//////////////////////////////////////////////////////////////////////////////
73
74static SkView* MyFactory() { return new AnimBlurView; }
75static SkViewRegister reg(MyFactory);
76