15ed90f6ee
git-svn-id: http://skia.googlecode.com/svn/trunk@6934 2bbb7eff-a529-9590-31e7-b0007b416f81
88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
/*
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* Copyright 2012 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 "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "SkRandom.h"
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static void rotateAbout(SkCanvas* canvas, SkScalar degrees,
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SkScalar cx, SkScalar cy) {
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canvas->translate(cx, cy);
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canvas->rotate(degrees);
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canvas->translate(-cx, -cy);
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}
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class RotateCirclesView : public SampleView {
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public:
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RotateCirclesView() {
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this->setBGColor(SK_ColorLTGRAY);
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fAngle = 0;
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}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "RotateCircles");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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virtual void onDrawContent(SkCanvas* canvas) {
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SkRandom rand;
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStrokeWidth(20);
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SkScalar cx = 240;
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SkScalar cy = 240;
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SkScalar DX = 240 * 2;
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SkColor color = 0;
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float scale = 1;
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float sign = 0.3f;
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for (SkScalar rad = 200; rad >= 20; rad -= 15) {
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sign = -sign;
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scale += 0.2f;
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paint.setColor(rand.nextU());
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paint.setAlpha(0xFF);
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color = ~color;
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paint.setStyle(SkPaint::kFill_Style);
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canvas->save();
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rotateAbout(canvas, fAngle * scale * sign, cx, cy);
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canvas->drawCircle(cx, cy, rad, paint);
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canvas->restore();
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(rad*2);
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canvas->save();
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rotateAbout(canvas, fAngle * scale * sign, cx + DX, cy);
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canvas->drawCircle(cx + DX, cy, 10, paint);
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canvas->restore();
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}
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fAngle = (fAngle + 1) % 360;
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this->inval(NULL);
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}
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private:
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int fAngle;
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typedef SkView INHERITED;
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};
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static SkView* F0() { return new RotateCirclesView; }
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static SkViewRegister gR0(F0);
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