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/SkBlurTypes.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColorPriv.h"
11 #include "include/core/SkMaskFilter.h"
12 #include "src/base/SkRandom.h"
13 #include "tools/viewer/Slide.h"
14
15 #include <iterator>
16
get_anim_sin(double secs,SkScalar amplitude,SkScalar periodInSec,SkScalar phaseInSec)17 SkScalar get_anim_sin(double secs, SkScalar amplitude, SkScalar periodInSec, SkScalar phaseInSec) {
18 if (!periodInSec) {
19 return 0;
20 }
21 double t = secs + phaseInSec;
22 t *= (2 * SK_ScalarPI) / periodInSec;
23 amplitude = SK_ScalarHalf * amplitude;
24 return amplitude * SkDoubleToScalar(sin(t)) + amplitude;
25 }
26
27 class AnimBlurSlide : public Slide {
28 SkScalar fBlurSigma = 0;
29 SkScalar fCircleRadius = 100;
30
31 public:
AnimBlurSlide()32 AnimBlurSlide() { fName ="AnimBlur"; }
33
draw(SkCanvas * canvas)34 void draw(SkCanvas* canvas) override {
35 static const SkBlurStyle gStyles[] = {
36 kNormal_SkBlurStyle,
37 kInner_SkBlurStyle,
38 kSolid_SkBlurStyle,
39 kOuter_SkBlurStyle,
40 };
41 SkRandom random;
42
43 for (size_t i = 0; i < std::size(gStyles); ++i) {
44 SkPaint paint;
45 paint.setMaskFilter(SkMaskFilter::MakeBlur(gStyles[i],
46 fBlurSigma));
47 paint.setColor(random.nextU() | 0xff000000);
48 canvas->drawCircle(200 * SK_Scalar1 + 400 * (i % 2) * SK_Scalar1,
49 200 * SK_Scalar1 + i / 2 * 400 * SK_Scalar1,
50 fCircleRadius, paint);
51 }
52 }
53
animate(double nanos)54 bool animate(double nanos) override {
55 fBlurSigma = get_anim_sin(1e-9 * nanos, 100, 4, 5);
56 fCircleRadius = 3 + get_anim_sin(1e-9 * nanos, 150, 25, 3);
57 return true;
58 }
59 };
60
61 DEF_SLIDE( return new AnimBlurSlide(); )
62