samplecode/SamplePath.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 "SampleCode.h"
 #include "SkAnimTimer.h"
 #include "SkView.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
 #include "SkGraphics.h"
 #include "SkPath.h"
 #include "SkRegion.h"
 #include "SkShader.h"
 #include "SkUtils.h"
 #include "SkXfermode.h"
 #include "SkColorPriv.h"
 #include "SkColorFilter.h"
 #include "SkParsePath.h"
 #include "SkTime.h"
 #include "SkTypeface.h"

 #include "SkGeometry.h"

 #include <stdlib.h>

 // http://code.google.com/p/skia/issues/detail?id=32
 static void test_cubic() {
     SkPoint src[4] = {
         { 556.25000f, 523.03003f },
         { 556.23999f, 522.96002f },
         { 556.21997f, 522.89001f },
         { 556.21997f, 522.82001f }
     };
     SkPoint dst[11];
     dst[10].set(42, -42);   // one past the end, that we don't clobber these
     SkScalar tval[] = { 0.33333334f, 0.99999994f };

     SkChopCubicAt(src, dst, tval, 2);

 #if 0
     for (int i = 0; i < 11; i++) {
         SkDebugf("--- %d [%g %g]\n", i, dst[i].fX, dst[i].fY);
     }
 #endif
 }

 static void test_cubic2() {
     const char* str = "M2242 -590088L-377758 9.94099e+07L-377758 9.94099e+07L2242 -590088Z";
     SkPath path;
     SkParsePath::FromSVGString(str, &path);

     {
         SkRect r = path.getBounds();
         SkIRect ir;
         r.round(&ir);
         SkDebugf("[%g %g %g %g] [%x %x %x %x]\n",
                 SkScalarToDouble(r.fLeft), SkScalarToDouble(r.fTop),
                 SkScalarToDouble(r.fRight), SkScalarToDouble(r.fBottom),
                 ir.fLeft, ir.fTop, ir.fRight, ir.fBottom);
     }

     SkBitmap bitmap;
     bitmap.allocN32Pixels(300, 200);

     SkCanvas canvas(bitmap);
     SkPaint paint;
     paint.setAntiAlias(true);
     canvas.drawPath(path, paint);
 }

 class PathView : public SampleView {
     SkScalar fPrevSecs;
 public:
     SkScalar fDStroke, fStroke, fMinStroke, fMaxStroke;
     SkPath fPath[6];
     bool fShowHairline;
     bool fOnce;

     PathView() {
         fPrevSecs = 0;
         fOnce = false;
     }

     void init() {
         if (fOnce) {
             return;
         }
         fOnce = true;

         test_cubic();
         test_cubic2();

         fShowHairline = false;

         fDStroke = 1;
         fStroke = 10;
         fMinStroke = 10;
         fMaxStroke = 180;

         const SkScalar V = 85;

         fPath[0].moveTo(40, 70);
         fPath[0].lineTo(70, 70 + SK_ScalarHalf);
         fPath[0].lineTo(110, 70);

         fPath[1].moveTo(40, 70);
         fPath[1].lineTo(70, 70 - SK_ScalarHalf);
         fPath[1].lineTo(110, 70);

         fPath[2].moveTo(V, V);
         fPath[2].lineTo(50, V);
         fPath[2].lineTo(50, 50);

         fPath[3].moveTo(50, 50);
         fPath[3].lineTo(50, V);
         fPath[3].lineTo(V, V);

         fPath[4].moveTo(50, 50);
         fPath[4].lineTo(50, V);
         fPath[4].lineTo(52, 50);

         fPath[5].moveTo(52, 50);
         fPath[5].lineTo(50, V);
         fPath[5].lineTo(50, 50);

         this->setBGColor(0xFFDDDDDD);
     }

 protected:
     // overrides from SkEventSink
     bool onQuery(SkEvent* evt) override {
         if (SampleCode::TitleQ(*evt)) {
             SampleCode::TitleR(evt, "Paths");
             return true;
         }
         return this->INHERITED::onQuery(evt);
     }

     void drawPath(SkCanvas* canvas, const SkPath& path, SkPaint::Join j) {
         SkPaint paint;

         paint.setAntiAlias(true);
         paint.setStyle(SkPaint::kStroke_Style);
         paint.setStrokeJoin(j);
         paint.setStrokeWidth(fStroke);

         if (fShowHairline) {
             SkPath  fill;

             paint.getFillPath(path, &fill);
             paint.setStrokeWidth(0);
             canvas->drawPath(fill, paint);
         } else {
             canvas->drawPath(path, paint);
         }

         paint.setColor(SK_ColorRED);
         paint.setStrokeWidth(0);
         canvas->drawPath(path, paint);
     }

     void onDrawContent(SkCanvas* canvas) override {
         this->init();
         canvas->translate(50, 50);

         static const SkPaint::Join gJoins[] = {
             SkPaint::kBevel_Join,
             SkPaint::kMiter_Join,
             SkPaint::kRound_Join
         };

         for (size_t i = 0; i < SK_ARRAY_COUNT(gJoins); i++) {
             canvas->save();
             for (size_t j = 0; j < SK_ARRAY_COUNT(fPath); j++) {
                 this->drawPath(canvas, fPath[j], gJoins[i]);
                 canvas->translate(200, 0);
             }
             canvas->restore();

             canvas->translate(0, 200);
         }
     }

     bool onAnimate(const SkAnimTimer& timer) override {
         SkScalar currSecs = timer.scaled(100);
         SkScalar delta = currSecs - fPrevSecs;
         fPrevSecs = currSecs;

         fStroke += fDStroke * delta;
         if (fStroke > fMaxStroke || fStroke < fMinStroke) {
             fDStroke = -fDStroke;
         }
         return true;
     }

     SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
         fShowHairline = !fShowHairline;
         this->inval(nullptr);
         return this->INHERITED::onFindClickHandler(x, y, modi);
     }

 private:
     typedef SampleView INHERITED;
 };
 DEF_SAMPLE( return new PathView; )

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

 #include "SkArcToPathEffect.h"
 #include "SkCornerPathEffect.h"
 #include "SkRandom.h"

 class ArcToView : public SampleView {
     bool fDoFrame, fDoArcTo, fDoCorner, fDoConic;
     SkPaint fPtsPaint, fArcToPaint, fSkeletonPaint, fCornerPaint;
 public:
     enum {
         N = 4
     };
     SkPoint fPts[N];

     ArcToView()
         : fDoFrame(false), fDoArcTo(false), fDoCorner(false), fDoConic(false)
     {
         SkRandom rand;
         for (int i = 0; i < N; ++i) {
             fPts[i].fX = 20 + rand.nextUScalar1() * 640;
             fPts[i].fY = 20 + rand.nextUScalar1() * 480;
         }

         const SkScalar rad = 50;

         fPtsPaint.setAntiAlias(true);
         fPtsPaint.setStrokeWidth(15);
         fPtsPaint.setStrokeCap(SkPaint::kRound_Cap);

         fArcToPaint.setAntiAlias(true);
         fArcToPaint.setStyle(SkPaint::kStroke_Style);
         fArcToPaint.setStrokeWidth(9);
         fArcToPaint.setColor(0x800000FF);
         fArcToPaint.setPathEffect(SkArcToPathEffect::Make(rad));

         fCornerPaint.setAntiAlias(true);
         fCornerPaint.setStyle(SkPaint::kStroke_Style);
         fCornerPaint.setStrokeWidth(13);
         fCornerPaint.setColor(SK_ColorGREEN);
         fCornerPaint.setPathEffect(SkCornerPathEffect::Make(rad*2));

         fSkeletonPaint.setAntiAlias(true);
         fSkeletonPaint.setStyle(SkPaint::kStroke_Style);
         fSkeletonPaint.setColor(SK_ColorRED);
     }

     void toggle(bool& value) {
         value = !value;
         this->inval(nullptr);
     }

 protected:
     // overrides from SkEventSink
     bool onQuery(SkEvent* evt) override {
         if (SampleCode::TitleQ(*evt)) {
             SampleCode::TitleR(evt, "ArcTo");
             return true;
         }
         SkUnichar uni;
         if (SampleCode::CharQ(*evt, &uni)) {
             switch (uni) {
                 case '1': this->toggle(fDoFrame); return true;
                 case '2': this->toggle(fDoArcTo); return true;
                 case '3': this->toggle(fDoCorner); return true;
                 case '4': this->toggle(fDoConic); return true;
                 default: break;
             }
         }
         return this->INHERITED::onQuery(evt);
     }

     void makePath(SkPath* path) {
         path->moveTo(fPts[0]);
         for (int i = 1; i < N; ++i) {
             path->lineTo(fPts[i]);
         }
         if (!fDoFrame) {
             path->close();
         }
     }

     void onDrawContent(SkCanvas* canvas) override {
         canvas->drawPoints(SkCanvas::kPoints_PointMode, N, fPts, fPtsPaint);

         SkPath path;
         this->makePath(&path);

         if (fDoCorner) {
             canvas->drawPath(path, fCornerPaint);
         }
         if (fDoArcTo) {
             canvas->drawPath(path, fArcToPaint);
         }

         canvas->drawPath(path, fSkeletonPaint);
     }

     bool onClick(Click* click) override {
         int32_t index;
         if (click->fMeta.findS32("index", &index)) {
             SkASSERT((unsigned)index < N);
             fPts[index] = click->fCurr;
             this->inval(nullptr);
             return true;
         }
         return false;
     }

     SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
         const SkScalar tol = 4;
         const SkRect r = SkRect::MakeXYWH(x - tol, y - tol, tol * 2, tol * 2);
         for (int i = 0; i < N; ++i) {
             if (r.intersects(SkRect::MakeXYWH(fPts[i].fX, fPts[i].fY, 1, 1))) {
                 Click* click = new Click(this);
                 click->fMeta.setS32("index", i);
                 return click;
             }
         }
         return this->INHERITED::onFindClickHandler(x, y, modi);
     }

 private:
     typedef SampleView INHERITED;
 };
 DEF_SAMPLE( return new ArcToView; )
	/*
	* 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 "SampleCode.h"
	#include "SkAnimTimer.h"
	#include "SkView.h"
	#include "SkCanvas.h"
	#include "SkGradientShader.h"
	#include "SkGraphics.h"
	#include "SkPath.h"
	#include "SkRegion.h"
	#include "SkShader.h"
	#include "SkUtils.h"
	#include "SkXfermode.h"
	#include "SkColorPriv.h"
	#include "SkColorFilter.h"
	#include "SkParsePath.h"
	#include "SkTime.h"
	#include "SkTypeface.h"

	#include "SkGeometry.h"

	#include <stdlib.h>

	// http://code.google.com/p/skia/issues/detail?id=32
	static void test_cubic() {
	SkPoint src[4] = {
	{ 556.25000f, 523.03003f },
	{ 556.23999f, 522.96002f },
	{ 556.21997f, 522.89001f },
	{ 556.21997f, 522.82001f }
	};
	SkPoint dst[11];
	dst[10].set(42, -42); // one past the end, that we don't clobber these
	SkScalar tval[] = { 0.33333334f, 0.99999994f };

	SkChopCubicAt(src, dst, tval, 2);

	#if 0
	for (int i = 0; i < 11; i++) {
	SkDebugf("--- %d [%g %g]\n", i, dst[i].fX, dst[i].fY);
	}
	#endif
	}

	static void test_cubic2() {
	const char* str = "M2242 -590088L-377758 9.94099e+07L-377758 9.94099e+07L2242 -590088Z";
	SkPath path;
	SkParsePath::FromSVGString(str, &path);

	{
	SkRect r = path.getBounds();
	SkIRect ir;
	r.round(&ir);
	SkDebugf("[%g %g %g %g] [%x %x %x %x]\n",
	SkScalarToDouble(r.fLeft), SkScalarToDouble(r.fTop),
	SkScalarToDouble(r.fRight), SkScalarToDouble(r.fBottom),
	ir.fLeft, ir.fTop, ir.fRight, ir.fBottom);
	}

	SkBitmap bitmap;
	bitmap.allocN32Pixels(300, 200);

	SkCanvas canvas(bitmap);
	SkPaint paint;
	paint.setAntiAlias(true);
	canvas.drawPath(path, paint);
	}

	class PathView : public SampleView {
	SkScalar fPrevSecs;
	public:
	SkScalar fDStroke, fStroke, fMinStroke, fMaxStroke;
	SkPath fPath[6];
	bool fShowHairline;
	bool fOnce;

	PathView() {
	fPrevSecs = 0;
	fOnce = false;
	}

	void init() {
	if (fOnce) {
	return;
	}
	fOnce = true;

	test_cubic();
	test_cubic2();

	fShowHairline = false;

	fDStroke = 1;
	fStroke = 10;
	fMinStroke = 10;
	fMaxStroke = 180;

	const SkScalar V = 85;

	fPath[0].moveTo(40, 70);
	fPath[0].lineTo(70, 70 + SK_ScalarHalf);
	fPath[0].lineTo(110, 70);

	fPath[1].moveTo(40, 70);
	fPath[1].lineTo(70, 70 - SK_ScalarHalf);
	fPath[1].lineTo(110, 70);

	fPath[2].moveTo(V, V);
	fPath[2].lineTo(50, V);
	fPath[2].lineTo(50, 50);

	fPath[3].moveTo(50, 50);
	fPath[3].lineTo(50, V);
	fPath[3].lineTo(V, V);

	fPath[4].moveTo(50, 50);
	fPath[4].lineTo(50, V);
	fPath[4].lineTo(52, 50);

	fPath[5].moveTo(52, 50);
	fPath[5].lineTo(50, V);
	fPath[5].lineTo(50, 50);

	this->setBGColor(0xFFDDDDDD);
	}

	protected:
	// overrides from SkEventSink
	bool onQuery(SkEvent* evt) override {
	if (SampleCode::TitleQ(*evt)) {
	SampleCode::TitleR(evt, "Paths");
	return true;
	}
	return this->INHERITED::onQuery(evt);
	}

	void drawPath(SkCanvas* canvas, const SkPath& path, SkPaint::Join j) {
	SkPaint paint;

	paint.setAntiAlias(true);
	paint.setStyle(SkPaint::kStroke_Style);
	paint.setStrokeJoin(j);
	paint.setStrokeWidth(fStroke);

	if (fShowHairline) {
	SkPath fill;

	paint.getFillPath(path, &fill);
	paint.setStrokeWidth(0);
	canvas->drawPath(fill, paint);
	} else {
	canvas->drawPath(path, paint);
	}

	paint.setColor(SK_ColorRED);
	paint.setStrokeWidth(0);
	canvas->drawPath(path, paint);
	}

	void onDrawContent(SkCanvas* canvas) override {
	this->init();
	canvas->translate(50, 50);

	static const SkPaint::Join gJoins[] = {
	SkPaint::kBevel_Join,
	SkPaint::kMiter_Join,
	SkPaint::kRound_Join
	};

	for (size_t i = 0; i < SK_ARRAY_COUNT(gJoins); i++) {
	canvas->save();
	for (size_t j = 0; j < SK_ARRAY_COUNT(fPath); j++) {
	this->drawPath(canvas, fPath[j], gJoins[i]);
	canvas->translate(200, 0);
	}
	canvas->restore();

	canvas->translate(0, 200);
	}
	}

	bool onAnimate(const SkAnimTimer& timer) override {
	SkScalar currSecs = timer.scaled(100);
	SkScalar delta = currSecs - fPrevSecs;
	fPrevSecs = currSecs;

	fStroke += fDStroke * delta;
	if (fStroke > fMaxStroke \|\| fStroke < fMinStroke) {
	fDStroke = -fDStroke;
	}
	return true;
	}

	SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
	fShowHairline = !fShowHairline;
	this->inval(nullptr);
	return this->INHERITED::onFindClickHandler(x, y, modi);
	}

	private:
	typedef SampleView INHERITED;
	};
	DEF_SAMPLE( return new PathView; )

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

	#include "SkArcToPathEffect.h"
	#include "SkCornerPathEffect.h"
	#include "SkRandom.h"

	class ArcToView : public SampleView {
	bool fDoFrame, fDoArcTo, fDoCorner, fDoConic;
	SkPaint fPtsPaint, fArcToPaint, fSkeletonPaint, fCornerPaint;
	public:
	enum {
	N = 4
	};
	SkPoint fPts[N];

	ArcToView()
	: fDoFrame(false), fDoArcTo(false), fDoCorner(false), fDoConic(false)
	{
	SkRandom rand;
	for (int i = 0; i < N; ++i) {
	fPts[i].fX = 20 + rand.nextUScalar1() * 640;
	fPts[i].fY = 20 + rand.nextUScalar1() * 480;
	}

	const SkScalar rad = 50;

	fPtsPaint.setAntiAlias(true);
	fPtsPaint.setStrokeWidth(15);
	fPtsPaint.setStrokeCap(SkPaint::kRound_Cap);

	fArcToPaint.setAntiAlias(true);
	fArcToPaint.setStyle(SkPaint::kStroke_Style);
	fArcToPaint.setStrokeWidth(9);
	fArcToPaint.setColor(0x800000FF);
	fArcToPaint.setPathEffect(SkArcToPathEffect::Make(rad));

	fCornerPaint.setAntiAlias(true);
	fCornerPaint.setStyle(SkPaint::kStroke_Style);
	fCornerPaint.setStrokeWidth(13);
	fCornerPaint.setColor(SK_ColorGREEN);
	fCornerPaint.setPathEffect(SkCornerPathEffect::Make(rad*2));

	fSkeletonPaint.setAntiAlias(true);
	fSkeletonPaint.setStyle(SkPaint::kStroke_Style);
	fSkeletonPaint.setColor(SK_ColorRED);
	}

	void toggle(bool& value) {
	value = !value;
	this->inval(nullptr);
	}

	protected:
	// overrides from SkEventSink
	bool onQuery(SkEvent* evt) override {
	if (SampleCode::TitleQ(*evt)) {
	SampleCode::TitleR(evt, "ArcTo");
	return true;
	}
	SkUnichar uni;
	if (SampleCode::CharQ(*evt, &uni)) {
	switch (uni) {
	case '1': this->toggle(fDoFrame); return true;
	case '2': this->toggle(fDoArcTo); return true;
	case '3': this->toggle(fDoCorner); return true;
	case '4': this->toggle(fDoConic); return true;
	default: break;
	}
	}
	return this->INHERITED::onQuery(evt);
	}

	void makePath(SkPath* path) {
	path->moveTo(fPts[0]);
	for (int i = 1; i < N; ++i) {
	path->lineTo(fPts[i]);
	}
	if (!fDoFrame) {
	path->close();
	}
	}

	void onDrawContent(SkCanvas* canvas) override {
	canvas->drawPoints(SkCanvas::kPoints_PointMode, N, fPts, fPtsPaint);

	SkPath path;
	this->makePath(&path);

	if (fDoCorner) {
	canvas->drawPath(path, fCornerPaint);
	}
	if (fDoArcTo) {
	canvas->drawPath(path, fArcToPaint);
	}

	canvas->drawPath(path, fSkeletonPaint);
	}

	bool onClick(Click* click) override {
	int32_t index;
	if (click->fMeta.findS32("index", &index)) {
	SkASSERT((unsigned)index < N);
	fPts[index] = click->fCurr;
	this->inval(nullptr);
	return true;
	}
	return false;
	}

	SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) override {
	const SkScalar tol = 4;
	const SkRect r = SkRect::MakeXYWH(x - tol, y - tol, tol * 2, tol * 2);
	for (int i = 0; i < N; ++i) {
	if (r.intersects(SkRect::MakeXYWH(fPts[i].fX, fPts[i].fY, 1, 1))) {
	Click* click = new Click(this);
	click->fMeta.setS32("index", i);
	return click;
	}
	}
	return this->INHERITED::onFindClickHandler(x, y, modi);
	}

	private:
	typedef SampleView INHERITED;
	};
	DEF_SAMPLE( return new ArcToView; )