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- /*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkCanvas.h"
- #include "include/core/SkColorPriv.h"
- #include "include/core/SkMaskFilter.h"
- #include "include/utils/SkRandom.h"
- #include "samplecode/Sample.h"
- SkScalar get_anim_sin(double secs, SkScalar amplitude, SkScalar periodInSec, SkScalar phaseInSec) {
- if (!periodInSec) {
- return 0;
- }
- double t = secs + phaseInSec;
- t *= SkScalarToFloat(2 * SK_ScalarPI) / periodInSec;
- amplitude = SK_ScalarHalf * amplitude;
- return amplitude * SkDoubleToScalar(sin(t)) + amplitude;
- }
- class AnimBlurView : public Sample {
- SkScalar fBlurSigma = 0;
- SkScalar fCircleRadius = 100;
- SkString name() override { return SkString("AnimBlur"); }
- void onDrawContent(SkCanvas* canvas) override {
- static const SkBlurStyle gStyles[] = {
- kNormal_SkBlurStyle,
- kInner_SkBlurStyle,
- kSolid_SkBlurStyle,
- kOuter_SkBlurStyle,
- };
- SkRandom random;
- for (size_t i = 0; i < SK_ARRAY_COUNT(gStyles); ++i) {
- SkPaint paint;
- paint.setMaskFilter(SkMaskFilter::MakeBlur(gStyles[i],
- fBlurSigma));
- paint.setColor(random.nextU() | 0xff000000);
- canvas->drawCircle(200 * SK_Scalar1 + 400 * (i % 2) * SK_Scalar1,
- 200 * SK_Scalar1 + i / 2 * 400 * SK_Scalar1,
- fCircleRadius, paint);
- }
- }
- bool onAnimate(double nanos) override {
- fBlurSigma = get_anim_sin(1e-9 * nanos, 100, 4, 5);
- fCircleRadius = 3 + get_anim_sin(1e-9 * nanos, 150, 25, 3);
- return true;
- }
- };
- DEF_SAMPLE( return new AnimBlurView(); )
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