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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkAnimTimer.h"
#include "SkCanvas.h"
#include "SkPathMeasure.h"
#include "SkRandom.h"
class AddArcGM : public skiagm::GM {
public:
AddArcGM() : fRotate(0) {}
protected:
SkString onShortName() SK_OVERRIDE { return SkString("addarc"); }
SkISize onISize() SK_OVERRIDE { return SkISize::Make(1040, 1040); }
void onDraw(SkCanvas* canvas) SK_OVERRIDE {
canvas->translate(20, 20);
SkRect r = SkRect::MakeWH(1000, 1000);
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(15);
const SkScalar inset = paint.getStrokeWidth() + 4;
const SkScalar sweepAngle = 345;
SkRandom rand;
SkScalar sign = 1;
while (r.width() > paint.getStrokeWidth() * 3) {
paint.setColor(rand.nextU() | (0xFF << 24));
SkScalar startAngle = rand.nextUScalar1() * 360;
SkScalar speed = SkScalarSqrt(16 / r.width()) * 0.5f;
startAngle += fRotate * 360 * speed * sign;
SkPath path;
path.addArc(r, startAngle, sweepAngle);
canvas->drawPath(path, paint);
r.inset(inset, inset);
sign = -sign;
}
}
bool onAnimate(const SkAnimTimer& timer) SK_OVERRIDE {
fRotate = timer.scaled(1, 360);
return true;
}
private:
SkScalar fRotate;
typedef skiagm::GM INHERITED;
};
DEF_GM( return new AddArcGM; )
///////////////////////////////////////////////////
#define R 400
class AddArcMeasGM : public skiagm::GM {
public:
AddArcMeasGM() {}
protected:
SkString onShortName() SK_OVERRIDE { return SkString("addarc_meas"); }
SkISize onISize() SK_OVERRIDE { return SkISize::Make(2*R + 40, 2*R + 40); }
void onDraw(SkCanvas* canvas) SK_OVERRIDE {
canvas->translate(R + 20, R + 20);
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
SkPaint measPaint;
measPaint.setAntiAlias(true);
measPaint.setColor(SK_ColorRED);
const SkRect oval = SkRect::MakeLTRB(-R, -R, R, R);
canvas->drawOval(oval, paint);
for (SkScalar deg = 0; deg < 360; deg += 10) {
const SkScalar rad = SkDegreesToRadians(deg);
SkScalar rx = SkScalarCos(rad) * R;
SkScalar ry = SkScalarSin(rad) * R;
canvas->drawLine(0, 0, rx, ry, paint);
SkPath path;
path.addArc(oval, 0, deg);
SkPathMeasure meas(path, false);
SkScalar arcLen = rad * R;
SkPoint pos;
if (meas.getPosTan(arcLen, &pos, NULL)) {
canvas->drawLine(0, 0, pos.x(), pos.y(), measPaint);
}
}
}
private:
typedef skiagm::GM INHERITED;
};
DEF_GM( return new AddArcMeasGM; )
///////////////////////////////////////////////////
// Emphasize drawing a stroked oval (containing conics) and then scaling the results up,
// to ensure that we compute the stroke taking the CTM into account
//
class StrokeCircleGM : public skiagm::GM {
public:
StrokeCircleGM() : fRotate(0) {}
protected:
SkString onShortName() SK_OVERRIDE { return SkString("strokecircle"); }
SkISize onISize() SK_OVERRIDE { return SkISize::Make(520, 520); }
void onDraw(SkCanvas* canvas) SK_OVERRIDE {
canvas->scale(20, 20);
canvas->translate(13, 13);
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SK_Scalar1 / 2);
const SkScalar delta = paint.getStrokeWidth() * 3 / 2;
SkRect r = SkRect::MakeXYWH(-12, -12, 24, 24);
SkRandom rand;
SkScalar sign = 1;
while (r.width() > paint.getStrokeWidth() * 2) {
SkAutoCanvasRestore acr(canvas, true);
canvas->rotate(fRotate * sign);
paint.setColor(rand.nextU() | (0xFF << 24));
canvas->drawOval(r, paint);
r.inset(delta, delta);
sign = -sign;
}
}
bool onAnimate(const SkAnimTimer& timer) SK_OVERRIDE {
fRotate = timer.scaled(60, 360);
return true;
}
private:
SkScalar fRotate;
typedef skiagm::GM INHERITED;
};
DEF_GM( return new StrokeCircleGM; )
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