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

 /*
  * Copyright 2011 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 "sk_tool_utils.h"
 #include "SkPath.h"
 #include "SkRandom.h"
 #include "SkDashPathEffect.h"
 #include "SkParsePath.h"

 #define W   400
 #define H   400
 #define N   50

 constexpr SkScalar SW = SkIntToScalar(W);
 constexpr SkScalar SH = SkIntToScalar(H);

 static void rnd_rect(SkRect* r, SkPaint* paint, SkRandom& rand) {
     SkScalar x = rand.nextUScalar1() * W;
     SkScalar y = rand.nextUScalar1() * H;
     SkScalar w = rand.nextUScalar1() * (W >> 2);
     SkScalar h = rand.nextUScalar1() * (H >> 2);
     SkScalar hoffset = rand.nextSScalar1();
     SkScalar woffset = rand.nextSScalar1();

     r->set(x, y, x + w, y + h);
     r->offset(-w/2 + woffset, -h/2 + hoffset);

     paint->setColor(rand.nextU());
     paint->setAlpha(0xFF);
 }


 class StrokesGM : public skiagm::GM {
 public:
     StrokesGM() {}

 protected:

     SkString onShortName() override {
         return SkString("strokes_round");
     }

     SkISize onISize() override {
         return SkISize::Make(W, H*2);
     }

     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
         paint.setStyle(SkPaint::kStroke_Style);
         paint.setStrokeWidth(SkIntToScalar(9)/2);

         for (int y = 0; y < 2; y++) {
             paint.setAntiAlias(!!y);
             SkAutoCanvasRestore acr(canvas, true);
             canvas->translate(0, SH * y);
             canvas->clipRect(SkRect::MakeLTRB(
                                               SkIntToScalar(2), SkIntToScalar(2)
                                               , SW - SkIntToScalar(2), SH - SkIntToScalar(2)
                                               ));

             SkRandom rand;
             for (int i = 0; i < N; i++) {
                 SkRect r;
                 rnd_rect(&r, &paint, rand);
                 canvas->drawOval(r, paint);
                 rnd_rect(&r, &paint, rand);
                 canvas->drawRoundRect(r, r.width()/4, r.height()/4, paint);
                 rnd_rect(&r, &paint, rand);
             }
         }
     }

 private:
     typedef skiagm::GM INHERITED;
 };

 /* See
    https://code.google.com/p/chromium/issues/detail?id=422974          and
    http://jsfiddle.net/1xnku3sg/2/
  */
 class ZeroLenStrokesGM : public skiagm::GM {
     SkPath fMoveHfPath, fMoveZfPath, fDashedfPath, fRefPath[4];
     SkPath fCubicPath, fQuadPath, fLinePath;
 protected:
     void onOnceBeforeDraw() override {

         SkAssertResult(SkParsePath::FromSVGString("M0,0h0M10,0h0M20,0h0", &fMoveHfPath));
         SkAssertResult(SkParsePath::FromSVGString("M0,0zM10,0zM20,0z", &fMoveZfPath));
         SkAssertResult(SkParsePath::FromSVGString("M0,0h25", &fDashedfPath));
         SkAssertResult(SkParsePath::FromSVGString("M 0 0 C 0 0 0 0 0 0", &fCubicPath));
         SkAssertResult(SkParsePath::FromSVGString("M 0 0 Q 0 0 0 0", &fQuadPath));
         SkAssertResult(SkParsePath::FromSVGString("M 0 0 L 0 0", &fLinePath));

         for (int i = 0; i < 3; ++i) {
             fRefPath[0].addCircle(i * 10.f, 0, 5);
             fRefPath[1].addCircle(i * 10.f, 0, 10);
             fRefPath[2].addRect(i * 10.f - 4, -2, i * 10.f + 4, 6);
             fRefPath[3].addRect(i * 10.f - 10, -10, i * 10.f + 10, 10);
         }
     }

     SkString onShortName() override {
         return SkString("zeroPath");
     }

     SkISize onISize() override {
         return SkISize::Make(W, H*2);
     }

     void onDraw(SkCanvas* canvas) override {
         SkPaint fillPaint, strokePaint, dashPaint;
         fillPaint.setAntiAlias(true);
         strokePaint = fillPaint;
         strokePaint.setStyle(SkPaint::kStroke_Style);
         for (int i = 0; i < 2; ++i) {
             fillPaint.setAlpha(255);
             strokePaint.setAlpha(255);
             strokePaint.setStrokeWidth(i ? 8.f : 10.f);
             strokePaint.setStrokeCap(i ? SkPaint::kSquare_Cap : SkPaint::kRound_Cap);
             canvas->save();
             canvas->translate(10 + i * 100.f, 10);
             canvas->drawPath(fMoveHfPath, strokePaint);
             canvas->translate(0, 20);
             canvas->drawPath(fMoveZfPath, strokePaint);
             dashPaint = strokePaint;
             const SkScalar intervals[] = { 0, 10 };
             dashPaint.setPathEffect(SkDashPathEffect::Make(intervals, 2, 0));
             SkPath fillPath;
             dashPaint.getFillPath(fDashedfPath, &fillPath);
             canvas->translate(0, 20);
             canvas->drawPath(fDashedfPath, dashPaint);
             canvas->translate(0, 20);
             canvas->drawPath(fRefPath[i * 2], fillPaint);
             strokePaint.setStrokeWidth(20);
             strokePaint.setAlpha(127);
             canvas->translate(0, 50);
             canvas->drawPath(fMoveHfPath, strokePaint);
             canvas->translate(0, 30);
             canvas->drawPath(fMoveZfPath, strokePaint);
             canvas->translate(0, 30);
             fillPaint.setAlpha(127);
             canvas->drawPath(fRefPath[1 + i * 2], fillPaint);
             canvas->translate(0, 30);
             canvas->drawPath(fCubicPath, strokePaint);
             canvas->translate(0, 30);
             canvas->drawPath(fQuadPath, strokePaint);
             canvas->translate(0, 30);
             canvas->drawPath(fLinePath, strokePaint);
             canvas->restore();
         }
     }

 private:
     typedef skiagm::GM INHERITED;
 };

 class TeenyStrokesGM : public skiagm::GM {

     SkString onShortName() override {
         return SkString("teenyStrokes");
     }

     SkISize onISize() override {
         return SkISize::Make(W, H*2);
     }

     static void line(SkScalar scale, SkCanvas* canvas, SkColor color) {
         SkPaint p;
         p.setAntiAlias(true);
         p.setStyle(SkPaint::kStroke_Style);
         p.setColor(color);
         canvas->translate(50, 0);
 	    canvas->save();
         p.setStrokeWidth(scale * 5);
 	    canvas->scale(1 / scale, 1 / scale);
         canvas->drawLine(20 * scale, 20 * scale, 20 * scale, 100 * scale, p);
         canvas->drawLine(20 * scale, 20 * scale, 100 * scale, 100 * scale, p);
         canvas->restore();
     }

     void onDraw(SkCanvas* canvas) override {
         line(0.00005f, canvas, SK_ColorBLACK);
         line(0.000045f, canvas, SK_ColorRED);
         line(0.0000035f, canvas, SK_ColorGREEN);
         line(0.000003f, canvas, SK_ColorBLUE);
         line(0.000002f, canvas, SK_ColorBLACK);
     }
 private:
     typedef skiagm::GM INHERITED;
 };

 DEF_SIMPLE_GM(CubicStroke, canvas, 384, 384) {
     SkPaint p;
     p.setAntiAlias(true);
     p.setStyle(SkPaint::kStroke_Style);
     p.setStrokeWidth(1.0720f);
 	SkPath path;
     path.moveTo(-6000,-6000);
     path.cubicTo(-3500,5500,-500,5500,2500,-6500);
     canvas->drawPath(path, p);
     p.setStrokeWidth(1.0721f);
     canvas->translate(10, 10);
     canvas->drawPath(path, p);
     p.setStrokeWidth(1.0722f);
     canvas->translate(10, 10);
     canvas->drawPath(path, p);
 }

 DEF_SIMPLE_GM(zerolinestroke, canvas, 90, 120) {
     SkPaint paint;
     paint.setStyle(SkPaint::kStroke_Style);
     paint.setStrokeWidth(20);
     paint.setAntiAlias(true);
     paint.setStrokeCap(SkPaint::kRound_Cap);

     SkPath path;
     path.moveTo(30, 90);
     path.lineTo(30, 90);
     path.lineTo(60, 90);
     path.lineTo(60, 90);
     canvas->drawPath(path, paint);

     path.reset();
     path.moveTo(30, 30);
     path.lineTo(60, 30);
     canvas->drawPath(path, paint);

     path.reset();
     path.moveTo(30, 60);
     path.lineTo(30, 60);
     path.lineTo(60, 60);
     canvas->drawPath(path, paint);
 }

 DEF_SIMPLE_GM(quadcap, canvas, 200, 200) {
     SkPaint p;
     p.setAntiAlias(true);
     p.setStyle(SkPaint::kStroke_Style);
     p.setStrokeWidth(0);
     SkPath path;
     SkPoint pts[] = {{105.738571f,13.126318f},
             {105.738571f,13.126318f},
             {123.753784f,1.f}};
     SkVector tangent = pts[1] - pts[2];
     tangent.normalize();
     SkPoint pts2[3];
     memcpy(pts2, pts, sizeof(pts));
     const SkScalar capOutset = SK_ScalarPI / 8;
     pts2[0].fX += tangent.fX * capOutset;
     pts2[0].fY += tangent.fY * capOutset;
     pts2[1].fX += tangent.fX * capOutset;
     pts2[1].fY += tangent.fY * capOutset;
     pts2[2].fX += -tangent.fX * capOutset;
     pts2[2].fY += -tangent.fY * capOutset;
     path.moveTo(pts2[0]);
     path.quadTo(pts2[1], pts2[2]);
     canvas->drawPath(path, p);

     path.reset();
     path.moveTo(pts[0]);
     path.quadTo(pts[1], pts[2]);
     p.setStrokeCap(SkPaint::kRound_Cap);
     canvas->translate(30, 0);
     canvas->drawPath(path, p);
 }

 class Strokes2GM : public skiagm::GM {
     SkPath fPath;
 protected:
     void onOnceBeforeDraw() override {
         SkRandom rand;
         fPath.moveTo(0, 0);
         for (int i = 0; i < 13; i++) {
             SkScalar x = rand.nextUScalar1() * (W >> 1);
             SkScalar y = rand.nextUScalar1() * (H >> 1);
             fPath.lineTo(x, y);
         }
     }


     SkString onShortName() override {
         return SkString("strokes_poly");
     }

     SkISize onISize() override {
         return SkISize::Make(W, H*2);
     }

     void onDraw(SkCanvas* canvas) override {
         canvas->drawColor(SK_ColorWHITE);

         SkPaint paint;
         paint.setStyle(SkPaint::kStroke_Style);
         paint.setStrokeWidth(SkIntToScalar(9)/2);

         for (int y = 0; y < 2; y++) {
             paint.setAntiAlias(!!y);
             SkAutoCanvasRestore acr(canvas, true);
             canvas->translate(0, SH * y);
             canvas->clipRect(SkRect::MakeLTRB(SkIntToScalar(2),
                                               SkIntToScalar(2),
                                               SW - SkIntToScalar(2),
                                               SH - SkIntToScalar(2)));

             SkRandom rand;
             for (int i = 0; i < N/2; i++) {
                 SkRect r;
                 rnd_rect(&r, &paint, rand);
                 canvas->rotate(SkIntToScalar(15), SW/2, SH/2);
                 canvas->drawPath(fPath, paint);
             }
         }
     }

 private:
     typedef skiagm::GM INHERITED;
 };

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

 static SkRect inset(const SkRect& r) {
     SkRect rr(r);
     rr.inset(r.width()/10, r.height()/10);
     return rr;
 }

 class Strokes3GM : public skiagm::GM {
     static void make0(SkPath* path, const SkRect& bounds, SkString* title) {
         path->addRect(bounds, SkPath::kCW_Direction);
         path->addRect(inset(bounds), SkPath::kCW_Direction);
         title->set("CW CW");
     }

     static void make1(SkPath* path, const SkRect& bounds, SkString* title) {
         path->addRect(bounds, SkPath::kCW_Direction);
         path->addRect(inset(bounds), SkPath::kCCW_Direction);
         title->set("CW CCW");
     }

     static void make2(SkPath* path, const SkRect& bounds, SkString* title) {
         path->addOval(bounds, SkPath::kCW_Direction);
         path->addOval(inset(bounds), SkPath::kCW_Direction);
         title->set("CW CW");
     }

     static void make3(SkPath* path, const SkRect& bounds, SkString* title) {
         path->addOval(bounds, SkPath::kCW_Direction);
         path->addOval(inset(bounds), SkPath::kCCW_Direction);
         title->set("CW CCW");
     }

     static void make4(SkPath* path, const SkRect& bounds, SkString* title) {
         path->addRect(bounds, SkPath::kCW_Direction);
         SkRect r = bounds;
         r.inset(bounds.width() / 10, -bounds.height() / 10);
         path->addOval(r, SkPath::kCW_Direction);
         title->set("CW CW");
     }

     static void make5(SkPath* path, const SkRect& bounds, SkString* title) {
         path->addRect(bounds, SkPath::kCW_Direction);
         SkRect r = bounds;
         r.inset(bounds.width() / 10, -bounds.height() / 10);
         path->addOval(r, SkPath::kCCW_Direction);
         title->set("CW CCW");
     }

 public:
     Strokes3GM() {}

 protected:

     SkString onShortName() override {
         return SkString("strokes3");
     }

     SkISize onISize() override {
         return SkISize::Make(1500, 1500);
     }

     void onDraw(SkCanvas* canvas) override {
         SkPaint origPaint;
         origPaint.setAntiAlias(true);
         origPaint.setStyle(SkPaint::kStroke_Style);
         SkPaint fillPaint(origPaint);
         fillPaint.setColor(SK_ColorRED);
         SkPaint strokePaint(origPaint);
         strokePaint.setColor(sk_tool_utils::color_to_565(0xFF4444FF));

         void (*procs[])(SkPath*, const SkRect&, SkString*) = {
             make0, make1, make2, make3, make4, make5
         };

         canvas->translate(SkIntToScalar(20), SkIntToScalar(80));

         SkRect bounds = SkRect::MakeWH(SkIntToScalar(50), SkIntToScalar(50));
         SkScalar dx = bounds.width() * 4/3;
         SkScalar dy = bounds.height() * 5;

         for (size_t i = 0; i < SK_ARRAY_COUNT(procs); ++i) {
             SkPath orig;
             SkString str;
             procs[i](&orig, bounds, &str);

             canvas->save();
             for (int j = 0; j < 13; ++j) {
                 strokePaint.setStrokeWidth(SK_Scalar1 * j * j);
                 canvas->drawPath(orig, strokePaint);
                 canvas->drawPath(orig, origPaint);
                 SkPath fill;
                 strokePaint.getFillPath(orig, &fill);
                 canvas->drawPath(fill, fillPaint);
                 canvas->translate(dx + strokePaint.getStrokeWidth(), 0);
             }
             canvas->restore();
             canvas->translate(0, dy);
         }
     }

 private:
     typedef skiagm::GM INHERITED;
 };

 class Strokes4GM : public skiagm::GM {
 public:
     Strokes4GM() {}

 protected:

     SkString onShortName() override {
         return SkString("strokes_zoomed");
     }

     SkISize onISize() override {
         return SkISize::Make(W, H*2);
     }

     void onDraw(SkCanvas* canvas) override {
         SkPaint paint;
         paint.setStyle(SkPaint::kStroke_Style);
         paint.setStrokeWidth(0.055f);

         canvas->scale(1000, 1000);
         canvas->drawCircle(0, 2, 1.97f, paint);
     }

 private:
     typedef skiagm::GM INHERITED;
 };

 // Test stroking for curves that produce degenerate tangents when t is 0 or 1 (see bug 4191)
 class Strokes5GM : public skiagm::GM {
 public:
     Strokes5GM() {}

 protected:

     SkString onShortName() override {
         return SkString("zero_control_stroke");
     }

     SkISize onISize() override {
         return SkISize::Make(W, H*2);
     }

     void onDraw(SkCanvas* canvas) override {
         SkPaint p;
         p.setColor(SK_ColorRED);
         p.setAntiAlias(true);
         p.setStyle(SkPaint::kStroke_Style);
         p.setStrokeWidth(40);
         p.setStrokeCap(SkPaint::kButt_Cap);

         SkPath path;
         path.moveTo(157.474f,111.753f);
         path.cubicTo(128.5f,111.5f,35.5f,29.5f,35.5f,29.5f);
         canvas->drawPath(path, p);
         path.reset();
         path.moveTo(250, 50);
         path.quadTo(280, 80, 280, 80);
         canvas->drawPath(path, p);
         path.reset();
         path.moveTo(150, 50);
         path.conicTo(180, 80, 180, 80, 0.707f);
         canvas->drawPath(path, p);

         path.reset();
         path.moveTo(157.474f,311.753f);
         path.cubicTo(157.474f,311.753f,85.5f,229.5f,35.5f,229.5f);
         canvas->drawPath(path, p);
         path.reset();
         path.moveTo(280, 250);
         path.quadTo(280, 250, 310, 280);
         canvas->drawPath(path, p);
         path.reset();
         path.moveTo(180, 250);
         path.conicTo(180, 250, 210, 280, 0.707f);
         canvas->drawPath(path, p);
     }

 private:
     typedef skiagm::GM INHERITED;
 };


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

 DEF_GM( return new StrokesGM; )
 DEF_GM( return new Strokes2GM; )
 DEF_GM( return new Strokes3GM; )
 DEF_GM( return new Strokes4GM; )
 DEF_GM( return new Strokes5GM; )

 DEF_GM( return new ZeroLenStrokesGM; )
 DEF_GM( return new TeenyStrokesGM; )
	/*
	* Copyright 2011 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 "sk_tool_utils.h"
	#include "SkPath.h"
	#include "SkRandom.h"
	#include "SkDashPathEffect.h"
	#include "SkParsePath.h"

	#define W 400
	#define H 400
	#define N 50

	constexpr SkScalar SW = SkIntToScalar(W);
	constexpr SkScalar SH = SkIntToScalar(H);

	static void rnd_rect(SkRect* r, SkPaint* paint, SkRandom& rand) {
	SkScalar x = rand.nextUScalar1() * W;
	SkScalar y = rand.nextUScalar1() * H;
	SkScalar w = rand.nextUScalar1() * (W >> 2);
	SkScalar h = rand.nextUScalar1() * (H >> 2);
	SkScalar hoffset = rand.nextSScalar1();
	SkScalar woffset = rand.nextSScalar1();

	r->set(x, y, x + w, y + h);
	r->offset(-w/2 + woffset, -h/2 + hoffset);

	paint->setColor(rand.nextU());
	paint->setAlpha(0xFF);
	}


	class StrokesGM : public skiagm::GM {
	public:
	StrokesGM() {}

	protected:

	SkString onShortName() override {
	return SkString("strokes_round");
	}

	SkISize onISize() override {
	return SkISize::Make(W, H*2);
	}

	void onDraw(SkCanvas* canvas) override {
	SkPaint paint;
	paint.setStyle(SkPaint::kStroke_Style);
	paint.setStrokeWidth(SkIntToScalar(9)/2);

	for (int y = 0; y < 2; y++) {
	paint.setAntiAlias(!!y);
	SkAutoCanvasRestore acr(canvas, true);
	canvas->translate(0, SH * y);
	canvas->clipRect(SkRect::MakeLTRB(
	SkIntToScalar(2), SkIntToScalar(2)
	, SW - SkIntToScalar(2), SH - SkIntToScalar(2)
	));

	SkRandom rand;
	for (int i = 0; i < N; i++) {
	SkRect r;
	rnd_rect(&r, &paint, rand);
	canvas->drawOval(r, paint);
	rnd_rect(&r, &paint, rand);
	canvas->drawRoundRect(r, r.width()/4, r.height()/4, paint);
	rnd_rect(&r, &paint, rand);
	}
	}
	}

	private:
	typedef skiagm::GM INHERITED;
	};

	/* See
	https://code.google.com/p/chromium/issues/detail?id=422974 and
	http://jsfiddle.net/1xnku3sg/2/
	*/
	class ZeroLenStrokesGM : public skiagm::GM {
	SkPath fMoveHfPath, fMoveZfPath, fDashedfPath, fRefPath[4];
	SkPath fCubicPath, fQuadPath, fLinePath;
	protected:
	void onOnceBeforeDraw() override {

	SkAssertResult(SkParsePath::FromSVGString("M0,0h0M10,0h0M20,0h0", &fMoveHfPath));
	SkAssertResult(SkParsePath::FromSVGString("M0,0zM10,0zM20,0z", &fMoveZfPath));
	SkAssertResult(SkParsePath::FromSVGString("M0,0h25", &fDashedfPath));
	SkAssertResult(SkParsePath::FromSVGString("M 0 0 C 0 0 0 0 0 0", &fCubicPath));
	SkAssertResult(SkParsePath::FromSVGString("M 0 0 Q 0 0 0 0", &fQuadPath));
	SkAssertResult(SkParsePath::FromSVGString("M 0 0 L 0 0", &fLinePath));

	for (int i = 0; i < 3; ++i) {
	fRefPath[0].addCircle(i * 10.f, 0, 5);
	fRefPath[1].addCircle(i * 10.f, 0, 10);
	fRefPath[2].addRect(i * 10.f - 4, -2, i * 10.f + 4, 6);
	fRefPath[3].addRect(i * 10.f - 10, -10, i * 10.f + 10, 10);
	}
	}

	SkString onShortName() override {
	return SkString("zeroPath");
	}

	SkISize onISize() override {
	return SkISize::Make(W, H*2);
	}

	void onDraw(SkCanvas* canvas) override {
	SkPaint fillPaint, strokePaint, dashPaint;
	fillPaint.setAntiAlias(true);
	strokePaint = fillPaint;
	strokePaint.setStyle(SkPaint::kStroke_Style);
	for (int i = 0; i < 2; ++i) {
	fillPaint.setAlpha(255);
	strokePaint.setAlpha(255);
	strokePaint.setStrokeWidth(i ? 8.f : 10.f);
	strokePaint.setStrokeCap(i ? SkPaint::kSquare_Cap : SkPaint::kRound_Cap);
	canvas->save();
	canvas->translate(10 + i * 100.f, 10);
	canvas->drawPath(fMoveHfPath, strokePaint);
	canvas->translate(0, 20);
	canvas->drawPath(fMoveZfPath, strokePaint);
	dashPaint = strokePaint;
	const SkScalar intervals[] = { 0, 10 };
	dashPaint.setPathEffect(SkDashPathEffect::Make(intervals, 2, 0));
	SkPath fillPath;
	dashPaint.getFillPath(fDashedfPath, &fillPath);
	canvas->translate(0, 20);
	canvas->drawPath(fDashedfPath, dashPaint);
	canvas->translate(0, 20);
	canvas->drawPath(fRefPath[i * 2], fillPaint);
	strokePaint.setStrokeWidth(20);
	strokePaint.setAlpha(127);
	canvas->translate(0, 50);
	canvas->drawPath(fMoveHfPath, strokePaint);
	canvas->translate(0, 30);
	canvas->drawPath(fMoveZfPath, strokePaint);
	canvas->translate(0, 30);
	fillPaint.setAlpha(127);
	canvas->drawPath(fRefPath[1 + i * 2], fillPaint);
	canvas->translate(0, 30);
	canvas->drawPath(fCubicPath, strokePaint);
	canvas->translate(0, 30);
	canvas->drawPath(fQuadPath, strokePaint);
	canvas->translate(0, 30);
	canvas->drawPath(fLinePath, strokePaint);
	canvas->restore();
	}
	}

	private:
	typedef skiagm::GM INHERITED;
	};

	class TeenyStrokesGM : public skiagm::GM {

	SkString onShortName() override {
	return SkString("teenyStrokes");
	}

	SkISize onISize() override {
	return SkISize::Make(W, H*2);
	}

	static void line(SkScalar scale, SkCanvas* canvas, SkColor color) {
	SkPaint p;
	p.setAntiAlias(true);
	p.setStyle(SkPaint::kStroke_Style);
	p.setColor(color);
	canvas->translate(50, 0);
	canvas->save();
	p.setStrokeWidth(scale * 5);
	canvas->scale(1 / scale, 1 / scale);
	canvas->drawLine(20 * scale, 20 * scale, 20 * scale, 100 * scale, p);
	canvas->drawLine(20 * scale, 20 * scale, 100 * scale, 100 * scale, p);
	canvas->restore();
	}

	void onDraw(SkCanvas* canvas) override {
	line(0.00005f, canvas, SK_ColorBLACK);
	line(0.000045f, canvas, SK_ColorRED);
	line(0.0000035f, canvas, SK_ColorGREEN);
	line(0.000003f, canvas, SK_ColorBLUE);
	line(0.000002f, canvas, SK_ColorBLACK);
	}
	private:
	typedef skiagm::GM INHERITED;
	};

	DEF_SIMPLE_GM(CubicStroke, canvas, 384, 384) {
	SkPaint p;
	p.setAntiAlias(true);
	p.setStyle(SkPaint::kStroke_Style);
	p.setStrokeWidth(1.0720f);
	SkPath path;
	path.moveTo(-6000,-6000);
	path.cubicTo(-3500,5500,-500,5500,2500,-6500);
	canvas->drawPath(path, p);
	p.setStrokeWidth(1.0721f);
	canvas->translate(10, 10);
	canvas->drawPath(path, p);
	p.setStrokeWidth(1.0722f);
	canvas->translate(10, 10);
	canvas->drawPath(path, p);
	}

	DEF_SIMPLE_GM(zerolinestroke, canvas, 90, 120) {
	SkPaint paint;
	paint.setStyle(SkPaint::kStroke_Style);
	paint.setStrokeWidth(20);
	paint.setAntiAlias(true);
	paint.setStrokeCap(SkPaint::kRound_Cap);

	SkPath path;
	path.moveTo(30, 90);
	path.lineTo(30, 90);
	path.lineTo(60, 90);
	path.lineTo(60, 90);
	canvas->drawPath(path, paint);

	path.reset();
	path.moveTo(30, 30);
	path.lineTo(60, 30);
	canvas->drawPath(path, paint);

	path.reset();
	path.moveTo(30, 60);
	path.lineTo(30, 60);
	path.lineTo(60, 60);
	canvas->drawPath(path, paint);
	}

	DEF_SIMPLE_GM(quadcap, canvas, 200, 200) {
	SkPaint p;
	p.setAntiAlias(true);
	p.setStyle(SkPaint::kStroke_Style);
	p.setStrokeWidth(0);
	SkPath path;
	SkPoint pts[] = {{105.738571f,13.126318f},
	{105.738571f,13.126318f},
	{123.753784f,1.f}};
	SkVector tangent = pts[1] - pts[2];
	tangent.normalize();
	SkPoint pts2[3];
	memcpy(pts2, pts, sizeof(pts));
	const SkScalar capOutset = SK_ScalarPI / 8;
	pts2[0].fX += tangent.fX * capOutset;
	pts2[0].fY += tangent.fY * capOutset;
	pts2[1].fX += tangent.fX * capOutset;
	pts2[1].fY += tangent.fY * capOutset;
	pts2[2].fX += -tangent.fX * capOutset;
	pts2[2].fY += -tangent.fY * capOutset;
	path.moveTo(pts2[0]);
	path.quadTo(pts2[1], pts2[2]);
	canvas->drawPath(path, p);

	path.reset();
	path.moveTo(pts[0]);
	path.quadTo(pts[1], pts[2]);
	p.setStrokeCap(SkPaint::kRound_Cap);
	canvas->translate(30, 0);
	canvas->drawPath(path, p);
	}

	class Strokes2GM : public skiagm::GM {
	SkPath fPath;
	protected:
	void onOnceBeforeDraw() override {
	SkRandom rand;
	fPath.moveTo(0, 0);
	for (int i = 0; i < 13; i++) {
	SkScalar x = rand.nextUScalar1() * (W >> 1);
	SkScalar y = rand.nextUScalar1() * (H >> 1);
	fPath.lineTo(x, y);
	}
	}


	SkString onShortName() override {
	return SkString("strokes_poly");
	}

	SkISize onISize() override {
	return SkISize::Make(W, H*2);
	}

	void onDraw(SkCanvas* canvas) override {
	canvas->drawColor(SK_ColorWHITE);

	SkPaint paint;
	paint.setStyle(SkPaint::kStroke_Style);
	paint.setStrokeWidth(SkIntToScalar(9)/2);

	for (int y = 0; y < 2; y++) {
	paint.setAntiAlias(!!y);
	SkAutoCanvasRestore acr(canvas, true);
	canvas->translate(0, SH * y);
	canvas->clipRect(SkRect::MakeLTRB(SkIntToScalar(2),
	SkIntToScalar(2),
	SW - SkIntToScalar(2),
	SH - SkIntToScalar(2)));

	SkRandom rand;
	for (int i = 0; i < N/2; i++) {
	SkRect r;
	rnd_rect(&r, &paint, rand);
	canvas->rotate(SkIntToScalar(15), SW/2, SH/2);
	canvas->drawPath(fPath, paint);
	}
	}
	}

	private:
	typedef skiagm::GM INHERITED;
	};

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

	static SkRect inset(const SkRect& r) {
	SkRect rr(r);
	rr.inset(r.width()/10, r.height()/10);
	return rr;
	}

	class Strokes3GM : public skiagm::GM {
	static void make0(SkPath* path, const SkRect& bounds, SkString* title) {
	path->addRect(bounds, SkPath::kCW_Direction);
	path->addRect(inset(bounds), SkPath::kCW_Direction);
	title->set("CW CW");
	}

	static void make1(SkPath* path, const SkRect& bounds, SkString* title) {
	path->addRect(bounds, SkPath::kCW_Direction);
	path->addRect(inset(bounds), SkPath::kCCW_Direction);
	title->set("CW CCW");
	}

	static void make2(SkPath* path, const SkRect& bounds, SkString* title) {
	path->addOval(bounds, SkPath::kCW_Direction);
	path->addOval(inset(bounds), SkPath::kCW_Direction);
	title->set("CW CW");
	}

	static void make3(SkPath* path, const SkRect& bounds, SkString* title) {
	path->addOval(bounds, SkPath::kCW_Direction);
	path->addOval(inset(bounds), SkPath::kCCW_Direction);
	title->set("CW CCW");
	}

	static void make4(SkPath* path, const SkRect& bounds, SkString* title) {
	path->addRect(bounds, SkPath::kCW_Direction);
	SkRect r = bounds;
	r.inset(bounds.width() / 10, -bounds.height() / 10);
	path->addOval(r, SkPath::kCW_Direction);
	title->set("CW CW");
	}

	static void make5(SkPath* path, const SkRect& bounds, SkString* title) {
	path->addRect(bounds, SkPath::kCW_Direction);
	SkRect r = bounds;
	r.inset(bounds.width() / 10, -bounds.height() / 10);
	path->addOval(r, SkPath::kCCW_Direction);
	title->set("CW CCW");
	}

	public:
	Strokes3GM() {}

	protected:

	SkString onShortName() override {
	return SkString("strokes3");
	}

	SkISize onISize() override {
	return SkISize::Make(1500, 1500);
	}

	void onDraw(SkCanvas* canvas) override {
	SkPaint origPaint;
	origPaint.setAntiAlias(true);
	origPaint.setStyle(SkPaint::kStroke_Style);
	SkPaint fillPaint(origPaint);
	fillPaint.setColor(SK_ColorRED);
	SkPaint strokePaint(origPaint);
	strokePaint.setColor(sk_tool_utils::color_to_565(0xFF4444FF));

	void (procs[])(SkPath, const SkRect&, SkString*) = {
	make0, make1, make2, make3, make4, make5
	};

	canvas->translate(SkIntToScalar(20), SkIntToScalar(80));

	SkRect bounds = SkRect::MakeWH(SkIntToScalar(50), SkIntToScalar(50));
	SkScalar dx = bounds.width() * 4/3;
	SkScalar dy = bounds.height() * 5;

	for (size_t i = 0; i < SK_ARRAY_COUNT(procs); ++i) {
	SkPath orig;
	SkString str;
	procs[i](&orig, bounds, &str);

	canvas->save();
	for (int j = 0; j < 13; ++j) {
	strokePaint.setStrokeWidth(SK_Scalar1 * j * j);
	canvas->drawPath(orig, strokePaint);
	canvas->drawPath(orig, origPaint);
	SkPath fill;
	strokePaint.getFillPath(orig, &fill);
	canvas->drawPath(fill, fillPaint);
	canvas->translate(dx + strokePaint.getStrokeWidth(), 0);
	}
	canvas->restore();
	canvas->translate(0, dy);
	}
	}

	private:
	typedef skiagm::GM INHERITED;
	};

	class Strokes4GM : public skiagm::GM {
	public:
	Strokes4GM() {}

	protected:

	SkString onShortName() override {
	return SkString("strokes_zoomed");
	}

	SkISize onISize() override {
	return SkISize::Make(W, H*2);
	}

	void onDraw(SkCanvas* canvas) override {
	SkPaint paint;
	paint.setStyle(SkPaint::kStroke_Style);
	paint.setStrokeWidth(0.055f);

	canvas->scale(1000, 1000);
	canvas->drawCircle(0, 2, 1.97f, paint);
	}

	private:
	typedef skiagm::GM INHERITED;
	};

	// Test stroking for curves that produce degenerate tangents when t is 0 or 1 (see bug 4191)
	class Strokes5GM : public skiagm::GM {
	public:
	Strokes5GM() {}

	protected:

	SkString onShortName() override {
	return SkString("zero_control_stroke");
	}

	SkISize onISize() override {
	return SkISize::Make(W, H*2);
	}

	void onDraw(SkCanvas* canvas) override {
	SkPaint p;
	p.setColor(SK_ColorRED);
	p.setAntiAlias(true);
	p.setStyle(SkPaint::kStroke_Style);
	p.setStrokeWidth(40);
	p.setStrokeCap(SkPaint::kButt_Cap);

	SkPath path;
	path.moveTo(157.474f,111.753f);
	path.cubicTo(128.5f,111.5f,35.5f,29.5f,35.5f,29.5f);
	canvas->drawPath(path, p);
	path.reset();
	path.moveTo(250, 50);
	path.quadTo(280, 80, 280, 80);
	canvas->drawPath(path, p);
	path.reset();
	path.moveTo(150, 50);
	path.conicTo(180, 80, 180, 80, 0.707f);
	canvas->drawPath(path, p);

	path.reset();
	path.moveTo(157.474f,311.753f);
	path.cubicTo(157.474f,311.753f,85.5f,229.5f,35.5f,229.5f);
	canvas->drawPath(path, p);
	path.reset();
	path.moveTo(280, 250);
	path.quadTo(280, 250, 310, 280);
	canvas->drawPath(path, p);
	path.reset();
	path.moveTo(180, 250);
	path.conicTo(180, 250, 210, 280, 0.707f);
	canvas->drawPath(path, p);
	}

	private:
	typedef skiagm::GM INHERITED;
	};


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

	DEF_GM( return new StrokesGM; )
	DEF_GM( return new Strokes2GM; )
	DEF_GM( return new Strokes3GM; )
	DEF_GM( return new Strokes4GM; )
	DEF_GM( return new Strokes5GM; )

	DEF_GM( return new ZeroLenStrokesGM; )
	DEF_GM( return new TeenyStrokesGM; )