62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "SkCanvas.h"
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#include "SkRandom.h"
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class AddArcGM : public skiagm::GM {
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public:
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AddArcGM() : fRotate(0) {}
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protected:
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SkString onShortName() SK_OVERRIDE { return SkString("addarc"); }
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SkISize onISize() SK_OVERRIDE { return SkISize::Make(1040, 1040); }
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void onDraw(SkCanvas* canvas) SK_OVERRIDE {
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canvas->translate(20, 20);
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SkRect r = SkRect::MakeWH(1000, 1000);
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(15);
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const SkScalar inset = paint.getStrokeWidth() + 4;
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const SkScalar sweepAngle = 345;
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SkRandom rand;
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SkScalar sign = 1;
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while (r.width() > paint.getStrokeWidth() * 3) {
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paint.setColor(rand.nextU() | (0xFF << 24));
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SkScalar startAngle = rand.nextUScalar1() * 360;
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SkScalar speed = SkScalarSqrt(16 / r.width()) * 0.5f;
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startAngle += fRotate * 360 * speed * sign;
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SkPath path;
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path.addArc(r, startAngle, sweepAngle);
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canvas->drawPath(path, paint);
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r.inset(inset, inset);
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sign = -sign;
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}
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}
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bool onAnimatePulse(SkMSec curr, SkMSec prev) SK_OVERRIDE {
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fRotate = SkDoubleToScalar(fmod(curr * 0.001, 360));
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return true;
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}
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private:
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SkScalar fRotate;
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typedef skiagm::GM INHERITED;
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};
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DEF_GM( return new AddArcGM; )
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