skia2/samplecode/SampleAnimBlur.cpp
Hal Canary 8a027312cd Samples: add name() virtual
Change-Id: I9b6e39bc7e35346bb73dfe014de1c8daa5a92f2a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225428
Auto-Submit: Hal Canary <halcanary@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2019-07-03 17:41:16 +00:00

67 lines
2.0 KiB
C++

/*
* 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"
#include "tools/timer/AnimTimer.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 {
public:
AnimBlurView() : fBlurSigma(0), fCircleRadius(100) {}
protected:
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(const AnimTimer& 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 Sample INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_SAMPLE( return new AnimBlurView(); )