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 "include/core/SkCanvas.h"
9#include "include/core/SkColorPriv.h"
10#include "include/core/SkMaskFilter.h"
11#include "include/utils/SkRandom.h"
12#include "samplecode/Sample.h"
13
14SkScalar get_anim_sin(double secs, SkScalar amplitude, SkScalar periodInSec, SkScalar phaseInSec) {
15    if (!periodInSec) {
16        return 0;
17    }
18    double t = secs + phaseInSec;
19    t *= SkScalarToFloat(2 * SK_ScalarPI) / periodInSec;
20    amplitude = SK_ScalarHalf * amplitude;
21    return amplitude * SkDoubleToScalar(sin(t)) + amplitude;
22}
23
24class AnimBlurView : public Sample {
25    SkScalar fBlurSigma = 0;
26    SkScalar fCircleRadius = 100;
27
28    SkString name() override { return SkString("AnimBlur"); }
29
30    void onDrawContent(SkCanvas* canvas) override {
31        static const SkBlurStyle gStyles[] = {
32            kNormal_SkBlurStyle,
33            kInner_SkBlurStyle,
34            kSolid_SkBlurStyle,
35            kOuter_SkBlurStyle,
36        };
37        SkRandom random;
38
39        for (size_t i = 0; i < SK_ARRAY_COUNT(gStyles); ++i) {
40            SkPaint paint;
41            paint.setMaskFilter(SkMaskFilter::MakeBlur(gStyles[i],
42                                                       fBlurSigma));
43            paint.setColor(random.nextU() | 0xff000000);
44            canvas->drawCircle(200 * SK_Scalar1 + 400 * (i % 2) * SK_Scalar1,
45                               200 * SK_Scalar1 + i / 2 * 400 * SK_Scalar1,
46                               fCircleRadius, paint);
47        }
48    }
49
50    bool onAnimate(double nanos) override {
51        fBlurSigma = get_anim_sin(1e-9 * nanos, 100, 4, 5);
52        fCircleRadius = 3 + get_anim_sin(1e-9 * nanos, 150, 25, 3);
53        return true;
54    }
55};
56DEF_SAMPLE( return new AnimBlurView(); )
57