114 lines
3.0 KiB
C++
114 lines
3.0 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 "SkAnimTimer.h"
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#include "SkCanvas.h"
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#include "SkPathMeasure.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 onAnimate(const SkAnimTimer& timer) SK_OVERRIDE {
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fRotate = timer.scaled(1, 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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///////////////////////////////////////////////////
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#define R 400
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class AddArcMeasGM : public skiagm::GM {
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public:
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AddArcMeasGM() {}
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protected:
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SkString onShortName() SK_OVERRIDE { return SkString("addarc_meas"); }
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SkISize onISize() SK_OVERRIDE { return SkISize::Make(2*R + 40, 2*R + 40); }
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void onDraw(SkCanvas* canvas) SK_OVERRIDE {
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canvas->translate(R + 20, R + 20);
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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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SkPaint measPaint;
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measPaint.setAntiAlias(true);
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measPaint.setColor(SK_ColorRED);
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const SkRect oval = SkRect::MakeLTRB(-R, -R, R, R);
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canvas->drawOval(oval, paint);
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for (SkScalar deg = 0; deg < 360; deg += 10) {
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const SkScalar rad = SkDegreesToRadians(deg);
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SkScalar rx = SkScalarCos(rad) * R;
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SkScalar ry = SkScalarSin(rad) * R;
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canvas->drawLine(0, 0, rx, ry, paint);
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SkPath path;
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path.addArc(oval, 0, deg);
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SkPathMeasure meas(path, false);
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SkScalar arcLen = rad * R;
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SkPoint pos;
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if (meas.getPosTan(arcLen, &pos, NULL)) {
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canvas->drawLine(0, 0, pos.x(), pos.y(), measPaint);
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}
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}
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}
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private:
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typedef skiagm::GM INHERITED;
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};
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DEF_GM( return new AddArcMeasGM; )
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