gm/addarc.cpp - platform/external/skqp - Gitiles

 /*
  * 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() override { return SkString("addarc"); }

     SkISize onISize() override { return SkISize::Make(1040, 1040); }

     void onDraw(SkCanvas* canvas) 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(sk_tool_utils::color_to_565(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) 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() override { return SkString("addarc_meas"); }

     SkISize onISize() override { return SkISize::Make(2*R + 40, 2*R + 40); }

     void onDraw(SkCanvas* canvas) 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, nullptr)) {
                 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() override { return SkString("strokecircle"); }

     SkISize onISize() override { return SkISize::Make(520, 520); }

     void onDraw(SkCanvas* canvas) 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(sk_tool_utils::color_to_565(rand.nextU() | (0xFF << 24)));
             canvas->drawOval(r, paint);
             r.inset(delta, delta);
             sign = -sign;
         }
     }

     bool onAnimate(const SkAnimTimer& timer) override {
         fRotate = timer.scaled(60, 360);
         return true;
     }

 private:
     SkScalar fRotate;

     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new StrokeCircleGM; )

 //////////////////////

 // Fill circles and rotate them to test our Analytic Anti-Aliasing.
 // This test is based on StrokeCircleGM.
 class FillCircleGM : public skiagm::GM {
 public:
     FillCircleGM() : fRotate(0) {}

 protected:
     SkString onShortName() override { return SkString("fillcircle"); }

     SkISize onISize() override { return SkISize::Make(520, 520); }

     void onDraw(SkCanvas* canvas) 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 strokeWidth = paint.getStrokeWidth();
         const SkScalar delta = strokeWidth * 3 / 2;
         SkRect r = SkRect::MakeXYWH(-12, -12, 24, 24);
         SkRandom rand;

         // Reset style to fill. We only need stroke stype for producing delta and strokeWidth
         paint.setStyle(SkPaint::kFill_Style);

         SkScalar sign = 1;
         while (r.width() > strokeWidth * 2) {
             SkAutoCanvasRestore acr(canvas, true);
             canvas->rotate(fRotate * sign);
             paint.setColor(sk_tool_utils::color_to_565(rand.nextU() | (0xFF << 24)));
             canvas->drawOval(r, paint);
             r.inset(delta, delta);
             sign = -sign;
         }
     }

     bool onAnimate(const SkAnimTimer& timer) override {
         fRotate = timer.scaled(60, 360);
         return true;
     }

 private:
     SkScalar fRotate;

     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new FillCircleGM; )

 //////////////////////

 static void html_canvas_arc(SkPath* path, SkScalar x, SkScalar y, SkScalar r, SkScalar start,
                             SkScalar end, bool ccw, bool callArcTo) {
     SkRect bounds = { x - r, y - r, x + r, y + r };
     SkScalar sweep = ccw ? end - start : start - end;
     if (callArcTo)
         path->arcTo(bounds, start, sweep, false);
     else
         path->addArc(bounds, start, sweep);
 }

 // Lifted from canvas-arc-circumference-fill-diffs.html
 class ManyArcsGM : public skiagm::GM {
 public:
     ManyArcsGM() {}

 protected:
     SkString onShortName() override { return SkString("manyarcs"); }

     SkISize onISize() override { return SkISize::Make(620, 330); }

     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setStyle(SkPaint::kStroke_Style);

         canvas->translate(10, 10);

         // 20 angles.
         SkScalar sweepAngles[] = {
                            -123.7f, -2.3f, -2, -1, -0.3f, -0.000001f, 0, 0.000001f, 0.3f, 0.7f,
                            1, 1.3f, 1.5f, 1.7f, 1.99999f, 2, 2.00001f, 2.3f, 4.3f, 3934723942837.3f
         };
         for (size_t i = 0; i < SK_ARRAY_COUNT(sweepAngles); ++i) {
             sweepAngles[i] *= 180;
         }

         SkScalar startAngles[] = { -1, -0.5f, 0, 0.5f };
         for (size_t i = 0; i < SK_ARRAY_COUNT(startAngles); ++i) {
             startAngles[i] *= 180;
         }

         bool anticlockwise = false;
         SkScalar sign = 1;
         for (size_t i = 0; i < SK_ARRAY_COUNT(startAngles) * 2; ++i) {
             if (i == SK_ARRAY_COUNT(startAngles)) {
                 anticlockwise = true;
                 sign = -1;
             }
             SkScalar startAngle = startAngles[i % SK_ARRAY_COUNT(startAngles)] * sign;
             canvas->save();
             for (size_t j = 0; j < SK_ARRAY_COUNT(sweepAngles); ++j) {
                 SkPath path;
                 path.moveTo(0, 2);
                 html_canvas_arc(&path, 18, 15, 10, startAngle, startAngle + (sweepAngles[j] * sign),
                                 anticlockwise, true);
                 path.lineTo(0, 28);
                 canvas->drawPath(path, paint);
                 canvas->translate(30, 0);
             }
             canvas->restore();
             canvas->translate(0, 40);
         }
     }

 private:
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new ManyArcsGM; )

 // Lifted from https://bugs.chromium.org/p/chromium/issues/detail?id=640031
 class TinyAngleBigRadiusArcsGM : public skiagm::GM {
 public:
     TinyAngleBigRadiusArcsGM() {}

 protected:
     SkString onShortName() override { return SkString("tinyanglearcs"); }

     SkISize onISize() override { return SkISize::Make(620, 330); }

     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
         paint.setAntiAlias(true);
         paint.setStyle(SkPaint::kStroke_Style);

         canvas->translate(50, 50);

         SkScalar outerRadius = 100000.0f;
         SkScalar innerRadius = outerRadius - 20.0f;
         SkScalar centerX = 50;
         SkScalar centerY = outerRadius;
         SkScalar startAngles[] = { 1.5f * SK_ScalarPI , 1.501f * SK_ScalarPI  };
         SkScalar sweepAngle = 10.0f / outerRadius;

         for (size_t i = 0; i < SK_ARRAY_COUNT(startAngles); ++i) {
             SkPath path;
             SkScalar endAngle = startAngles[i] + sweepAngle;
             path.moveTo(centerX + innerRadius * sk_float_cos(startAngles[i]),
                         centerY + innerRadius * sk_float_sin(startAngles[i]));
             path.lineTo(centerX + outerRadius * sk_float_cos(startAngles[i]),
                         centerY + outerRadius * sk_float_sin(startAngles[i]));
             // A combination of tiny sweepAngle + large radius, we should draw a line.
             html_canvas_arc(&path, centerX, outerRadius, outerRadius,
                             startAngles[i] * 180 / SK_ScalarPI, endAngle * 180 / SK_ScalarPI,
                             true, true);
             path.lineTo(centerX + innerRadius * sk_float_cos(endAngle),
                         centerY + innerRadius * sk_float_sin(endAngle));
             html_canvas_arc(&path, centerX, outerRadius, innerRadius,
                             endAngle * 180 / SK_ScalarPI, startAngles[i] * 180 / SK_ScalarPI,
                             true, false);
             canvas->drawPath(path, paint);
             canvas->translate(20, 0);
         }
     }

 private:
     typedef skiagm::GM INHERITED;
 };
 DEF_GM( return new TinyAngleBigRadiusArcsGM; )
	/*
	* 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() override { return SkString("addarc"); }

	SkISize onISize() override { return SkISize::Make(1040, 1040); }

	void onDraw(SkCanvas* canvas) 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(sk_tool_utils::color_to_565(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) 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() override { return SkString("addarc_meas"); }

	SkISize onISize() override { return SkISize::Make(2R + 40, 2R + 40); }

	void onDraw(SkCanvas* canvas) 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, nullptr)) {
	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() override { return SkString("strokecircle"); }

	SkISize onISize() override { return SkISize::Make(520, 520); }

	void onDraw(SkCanvas* canvas) 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(sk_tool_utils::color_to_565(rand.nextU() \| (0xFF << 24)));
	canvas->drawOval(r, paint);
	r.inset(delta, delta);
	sign = -sign;
	}
	}

	bool onAnimate(const SkAnimTimer& timer) override {
	fRotate = timer.scaled(60, 360);
	return true;
	}

	private:
	SkScalar fRotate;

	typedef skiagm::GM INHERITED;
	};
	DEF_GM( return new StrokeCircleGM; )

	//////////////////////

	// Fill circles and rotate them to test our Analytic Anti-Aliasing.
	// This test is based on StrokeCircleGM.
	class FillCircleGM : public skiagm::GM {
	public:
	FillCircleGM() : fRotate(0) {}

	protected:
	SkString onShortName() override { return SkString("fillcircle"); }

	SkISize onISize() override { return SkISize::Make(520, 520); }

	void onDraw(SkCanvas* canvas) 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 strokeWidth = paint.getStrokeWidth();
	const SkScalar delta = strokeWidth * 3 / 2;
	SkRect r = SkRect::MakeXYWH(-12, -12, 24, 24);
	SkRandom rand;

	// Reset style to fill. We only need stroke stype for producing delta and strokeWidth
	paint.setStyle(SkPaint::kFill_Style);

	SkScalar sign = 1;
	while (r.width() > strokeWidth * 2) {
	SkAutoCanvasRestore acr(canvas, true);
	canvas->rotate(fRotate * sign);
	paint.setColor(sk_tool_utils::color_to_565(rand.nextU() \| (0xFF << 24)));
	canvas->drawOval(r, paint);
	r.inset(delta, delta);
	sign = -sign;
	}
	}

	bool onAnimate(const SkAnimTimer& timer) override {
	fRotate = timer.scaled(60, 360);
	return true;
	}

	private:
	SkScalar fRotate;

	typedef skiagm::GM INHERITED;
	};
	DEF_GM( return new FillCircleGM; )

	//////////////////////

	static void html_canvas_arc(SkPath* path, SkScalar x, SkScalar y, SkScalar r, SkScalar start,
	SkScalar end, bool ccw, bool callArcTo) {
	SkRect bounds = { x - r, y - r, x + r, y + r };
	SkScalar sweep = ccw ? end - start : start - end;
	if (callArcTo)
	path->arcTo(bounds, start, sweep, false);
	else
	path->addArc(bounds, start, sweep);
	}

	// Lifted from canvas-arc-circumference-fill-diffs.html
	class ManyArcsGM : public skiagm::GM {
	public:
	ManyArcsGM() {}

	protected:
	SkString onShortName() override { return SkString("manyarcs"); }

	SkISize onISize() override { return SkISize::Make(620, 330); }

	void onDraw(SkCanvas* canvas) override {
	SkPaint paint;
	paint.setAntiAlias(true);
	paint.setStyle(SkPaint::kStroke_Style);

	canvas->translate(10, 10);

	// 20 angles.
	SkScalar sweepAngles[] = {
	-123.7f, -2.3f, -2, -1, -0.3f, -0.000001f, 0, 0.000001f, 0.3f, 0.7f,
	1, 1.3f, 1.5f, 1.7f, 1.99999f, 2, 2.00001f, 2.3f, 4.3f, 3934723942837.3f
	};
	for (size_t i = 0; i < SK_ARRAY_COUNT(sweepAngles); ++i) {
	sweepAngles[i] *= 180;
	}

	SkScalar startAngles[] = { -1, -0.5f, 0, 0.5f };
	for (size_t i = 0; i < SK_ARRAY_COUNT(startAngles); ++i) {
	startAngles[i] *= 180;
	}

	bool anticlockwise = false;
	SkScalar sign = 1;
	for (size_t i = 0; i < SK_ARRAY_COUNT(startAngles) * 2; ++i) {
	if (i == SK_ARRAY_COUNT(startAngles)) {
	anticlockwise = true;
	sign = -1;
	}
	SkScalar startAngle = startAngles[i % SK_ARRAY_COUNT(startAngles)] * sign;
	canvas->save();
	for (size_t j = 0; j < SK_ARRAY_COUNT(sweepAngles); ++j) {
	SkPath path;
	path.moveTo(0, 2);
	html_canvas_arc(&path, 18, 15, 10, startAngle, startAngle + (sweepAngles[j] * sign),
	anticlockwise, true);
	path.lineTo(0, 28);
	canvas->drawPath(path, paint);
	canvas->translate(30, 0);
	}
	canvas->restore();
	canvas->translate(0, 40);
	}
	}

	private:
	typedef skiagm::GM INHERITED;
	};
	DEF_GM( return new ManyArcsGM; )

	// Lifted from https://bugs.chromium.org/p/chromium/issues/detail?id=640031
	class TinyAngleBigRadiusArcsGM : public skiagm::GM {
	public:
	TinyAngleBigRadiusArcsGM() {}

	protected:
	SkString onShortName() override { return SkString("tinyanglearcs"); }

	SkISize onISize() override { return SkISize::Make(620, 330); }

	void onDraw(SkCanvas* canvas) override {
	SkPaint paint;
	paint.setAntiAlias(true);
	paint.setStyle(SkPaint::kStroke_Style);

	canvas->translate(50, 50);

	SkScalar outerRadius = 100000.0f;
	SkScalar innerRadius = outerRadius - 20.0f;
	SkScalar centerX = 50;
	SkScalar centerY = outerRadius;
	SkScalar startAngles[] = { 1.5f * SK_ScalarPI , 1.501f * SK_ScalarPI };
	SkScalar sweepAngle = 10.0f / outerRadius;

	for (size_t i = 0; i < SK_ARRAY_COUNT(startAngles); ++i) {
	SkPath path;
	SkScalar endAngle = startAngles[i] + sweepAngle;
	path.moveTo(centerX + innerRadius * sk_float_cos(startAngles[i]),
	centerY + innerRadius * sk_float_sin(startAngles[i]));
	path.lineTo(centerX + outerRadius * sk_float_cos(startAngles[i]),
	centerY + outerRadius * sk_float_sin(startAngles[i]));
	// A combination of tiny sweepAngle + large radius, we should draw a line.
	html_canvas_arc(&path, centerX, outerRadius, outerRadius,
	startAngles[i] * 180 / SK_ScalarPI, endAngle * 180 / SK_ScalarPI,
	true, true);
	path.lineTo(centerX + innerRadius * sk_float_cos(endAngle),
	centerY + innerRadius * sk_float_sin(endAngle));
	html_canvas_arc(&path, centerX, outerRadius, innerRadius,
	endAngle * 180 / SK_ScalarPI, startAngles[i] * 180 / SK_ScalarPI,
	true, false);
	canvas->drawPath(path, paint);
	canvas->translate(20, 0);
	}
	}

	private:
	typedef skiagm::GM INHERITED;
	};
	DEF_GM( return new TinyAngleBigRadiusArcsGM; )