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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 "SampleCode.h"
#include "SkAnimTimer.h"
#include "SkBlurMaskFilter.h"
#include "SkColorPriv.h"
#include "SkCanvas.h"
#include "SkRandom.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 SampleView {
public:
AnimBlurView() : fBlurSigma(0), fCircleRadius(100) {}
protected:
// overrides from SkEventSink
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "AnimBlur");
return true;
}
return this->INHERITED::onQuery(evt);
}
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) {
SkMaskFilter* mf = SkBlurMaskFilter::Create(
gStyles[i],
fBlurSigma,
SkBlurMaskFilter::kHighQuality_BlurFlag);
SkPaint paint;
SkSafeUnref(paint.setMaskFilter(mf));
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(const SkAnimTimer& timer) override {
fBlurSigma = get_anim_sin(timer.secs(), 100, 4, 5);
fCircleRadius = 3 + get_anim_sin(timer.secs(), 150, 25, 3);
return true;
}
private:
SkScalar fBlurSigma, fCircleRadius;
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new AnimBlurView; }
static SkViewRegister reg(MyFactory);
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