WebCore/platform/graphics/qt/PathQt.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2006 Zack Rusin <zack@kde.org>
  *               2006 Rob Buis   <buis@kde.org>
  *
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"
 #include "Path.h"

 #include "FloatRect.h"
 #include "PlatformString.h"
 #include "AffineTransform.h"
 #include <QPainterPath>
 #include <QMatrix>
 #include <QString>

 #include <math.h>

 namespace WebCore {

 Path::Path()
     : m_path(new QPainterPath())
 {
 }

 Path::~Path()
 {
     delete m_path;
 }

 Path::Path(const Path& other)
     : m_path(new QPainterPath(*other.platformPath()))
 {
 }

 Path& Path::operator=(const Path& other)
 {
     if (&other != this) {
         delete m_path;
         m_path = new QPainterPath(*other.platformPath());
     }

     return *this;
 }

 bool Path::contains(const FloatPoint& point, WindRule rule) const
 {
     Qt::FillRule savedRule = m_path->fillRule();
     m_path->setFillRule(rule == RULE_EVENODD ? Qt::OddEvenFill : Qt::WindingFill);

     bool contains = m_path->contains(point);

     m_path->setFillRule(savedRule);
     return contains;
 }

 void Path::translate(const FloatSize& size)
 {
     QMatrix matrix;
     matrix.translate(size.width(), size.height());
     *m_path = (*m_path) * matrix;
 }

 FloatRect Path::boundingRect() const
 {
     return m_path->boundingRect();
 }

 void Path::moveTo(const FloatPoint& point)
 {
     m_path->moveTo(point);
 }

 void Path::addLineTo(const FloatPoint& p)
 {
     m_path->lineTo(p);
 }

 void Path::addQuadCurveTo(const FloatPoint& cp, const FloatPoint& p)
 {
     m_path->quadTo(cp, p);
 }

 void Path::addBezierCurveTo(const FloatPoint& cp1, const FloatPoint& cp2, const FloatPoint& p)
 {
     m_path->cubicTo(cp1, cp2, p);
 }

 void Path::addArcTo(const FloatPoint& p1, const FloatPoint& p2, float radius)
 {
     //FIXME: busted
     qWarning("arcTo is busted");
     m_path->arcTo(p1.x(), p1.y(), p2.x(), p2.y(), radius, 90);
 }

 void Path::closeSubpath()
 {
     m_path->closeSubpath();
 }

 #define DEGREES(t) ((t) * 180.0 / M_PI)
 void Path::addArc(const FloatPoint& p, float r, float sar, float ear, bool anticlockwise)
 {
     qreal xc = p.x();
     qreal yc = p.y();
     qreal radius = r;


     //### HACK
     // In Qt we don't switch the coordinate system for degrees
     // and still use the 0,0 as bottom left for degrees so we need
     // to switch
     sar = -sar;
     ear = -ear;
     anticlockwise = !anticlockwise;
     //end hack

     float sa = DEGREES(sar);
     float ea = DEGREES(ear);

     double span = 0;

     double xs = xc - radius;
     double ys = yc - radius;
     double width  = radius*2;
     double height = radius*2;

     if (!anticlockwise && (ea < sa))
         span += 360;
     else if (anticlockwise && (sa < ea))
         span -= 360;

     // this is also due to switched coordinate system
     // we would end up with a 0 span instead of 360
     if (!(qFuzzyCompare(span + (ea - sa), 0.0) &&
           qFuzzyCompare(qAbs(span), 360.0))) {
         span += ea - sa;
     }

     m_path->moveTo(QPointF(xc + radius  * cos(sar),
                           yc - radius  * sin(sar)));

     m_path->arcTo(xs, ys, width, height, sa, span);
 }

 void Path::addRect(const FloatRect& r)
 {
     m_path->addRect(r.x(), r.y(), r.width(), r.height());
 }

 void Path::addEllipse(const FloatRect& r)
 {
     m_path->addEllipse(r.x(), r.y(), r.width(), r.height());
 }

 void Path::clear()
 {
     *m_path = QPainterPath();
 }

 bool Path::isEmpty() const
 {
     return m_path->isEmpty();
 }

 String Path::debugString() const
 {
     QString ret;
     for (int i = 0; i < m_path->elementCount(); ++i) {
         const QPainterPath::Element &cur = m_path->elementAt(i);

         switch (cur.type) {
             case QPainterPath::MoveToElement:
                 ret += QString("M %1 %2").arg(cur.x).arg(cur.y);
                 break;
             case QPainterPath::LineToElement:
                 ret += QString("L %1 %2").arg(cur.x).arg(cur.y);
                 break;
             case QPainterPath::CurveToElement:
             {
                 const QPainterPath::Element &c1 = m_path->elementAt(i + 1);
                 const QPainterPath::Element &c2 = m_path->elementAt(i + 2);

                 Q_ASSERT(c1.type == QPainterPath::CurveToDataElement);
                 Q_ASSERT(c2.type == QPainterPath::CurveToDataElement);

                 ret += QString("C %1 %2 %3 %4 %5 %6").arg(cur.x).arg(cur.y).arg(c1.x).arg(c1.y).arg(c2.x).arg(c2.y);

                 i += 2;
                 break;
             }
             case QPainterPath::CurveToDataElement:
                 Q_ASSERT(false);
                 break;
         }
     }

     return ret;
 }

 void Path::apply(void* info, PathApplierFunction function) const
 {
     PathElement pelement;
     FloatPoint points[2];
     pelement.points = points;
     for (int i = 0; i < m_path->elementCount(); ++i) {
         const QPainterPath::Element& cur = m_path->elementAt(i);

         switch (cur.type) {
             case QPainterPath::MoveToElement:
                 pelement.type = PathElementMoveToPoint;
                 pelement.points[0] = QPointF(cur);
                 function(info, &pelement);
                 break;
             case QPainterPath::LineToElement:
                 pelement.type = PathElementAddLineToPoint;
                 pelement.points[0] = QPointF(cur);
                 function(info, &pelement);
                 break;
             case QPainterPath::CurveToElement:
             {
                 const QPainterPath::Element& c1 = m_path->elementAt(i + 1);
                 const QPainterPath::Element& c2 = m_path->elementAt(i + 2);

                 Q_ASSERT(c1.type == QPainterPath::CurveToDataElement);
                 Q_ASSERT(c2.type == QPainterPath::CurveToDataElement);

                 pelement.type = PathElementAddCurveToPoint;
                 pelement.points[0] = QPointF(cur);
                 pelement.points[1] = QPointF(c1);
                 pelement.points[2] = QPointF(c2);
                 function(info, &pelement);

                 i += 2;
                 break;
             }
             case QPainterPath::CurveToDataElement:
                 Q_ASSERT(false);
         }
     }
 }

 void Path::transform(const AffineTransform& transform)
 {
     if (m_path) {
         QMatrix mat = transform;
         QPainterPath temp = mat.map(*m_path);
         delete m_path;
         m_path = new QPainterPath(temp);
     }
 }

 }

 // vim: ts=4 sw=4 et
	/*
	* Copyright (C) 2006 Zack Rusin <zack@kde.org>
	* 2006 Rob Buis <buis@kde.org>
	*
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"
	#include "Path.h"

	#include "FloatRect.h"
	#include "PlatformString.h"
	#include "AffineTransform.h"
	#include <QPainterPath>
	#include <QMatrix>
	#include <QString>

	#include <math.h>

	namespace WebCore {

	Path::Path()
	: m_path(new QPainterPath())
	{
	}

	Path::~Path()
	{
	delete m_path;
	}

	Path::Path(const Path& other)
	: m_path(new QPainterPath(*other.platformPath()))
	{
	}

	Path& Path::operator=(const Path& other)
	{
	if (&other != this) {
	delete m_path;
	m_path = new QPainterPath(*other.platformPath());
	}

	return *this;
	}

	bool Path::contains(const FloatPoint& point, WindRule rule) const
	{
	Qt::FillRule savedRule = m_path->fillRule();
	m_path->setFillRule(rule == RULE_EVENODD ? Qt::OddEvenFill : Qt::WindingFill);

	bool contains = m_path->contains(point);

	m_path->setFillRule(savedRule);
	return contains;
	}

	void Path::translate(const FloatSize& size)
	{
	QMatrix matrix;
	matrix.translate(size.width(), size.height());
	m_path = (m_path) * matrix;
	}

	FloatRect Path::boundingRect() const
	{
	return m_path->boundingRect();
	}

	void Path::moveTo(const FloatPoint& point)
	{
	m_path->moveTo(point);
	}

	void Path::addLineTo(const FloatPoint& p)
	{
	m_path->lineTo(p);
	}

	void Path::addQuadCurveTo(const FloatPoint& cp, const FloatPoint& p)
	{
	m_path->quadTo(cp, p);
	}

	void Path::addBezierCurveTo(const FloatPoint& cp1, const FloatPoint& cp2, const FloatPoint& p)
	{
	m_path->cubicTo(cp1, cp2, p);
	}

	void Path::addArcTo(const FloatPoint& p1, const FloatPoint& p2, float radius)
	{
	//FIXME: busted
	qWarning("arcTo is busted");
	m_path->arcTo(p1.x(), p1.y(), p2.x(), p2.y(), radius, 90);
	}

	void Path::closeSubpath()
	{
	m_path->closeSubpath();
	}

	#define DEGREES(t) ((t) * 180.0 / M_PI)
	void Path::addArc(const FloatPoint& p, float r, float sar, float ear, bool anticlockwise)
	{
	qreal xc = p.x();
	qreal yc = p.y();
	qreal radius = r;


	//### HACK
	// In Qt we don't switch the coordinate system for degrees
	// and still use the 0,0 as bottom left for degrees so we need
	// to switch
	sar = -sar;
	ear = -ear;
	anticlockwise = !anticlockwise;
	//end hack

	float sa = DEGREES(sar);
	float ea = DEGREES(ear);

	double span = 0;

	double xs = xc - radius;
	double ys = yc - radius;
	double width = radius*2;
	double height = radius*2;

	if (!anticlockwise && (ea < sa))
	span += 360;
	else if (anticlockwise && (sa < ea))
	span -= 360;

	// this is also due to switched coordinate system
	// we would end up with a 0 span instead of 360
	if (!(qFuzzyCompare(span + (ea - sa), 0.0) &&
	qFuzzyCompare(qAbs(span), 360.0))) {
	span += ea - sa;
	}

	m_path->moveTo(QPointF(xc + radius * cos(sar),
	yc - radius * sin(sar)));

	m_path->arcTo(xs, ys, width, height, sa, span);
	}

	void Path::addRect(const FloatRect& r)
	{
	m_path->addRect(r.x(), r.y(), r.width(), r.height());
	}

	void Path::addEllipse(const FloatRect& r)
	{
	m_path->addEllipse(r.x(), r.y(), r.width(), r.height());
	}

	void Path::clear()
	{
	*m_path = QPainterPath();
	}

	bool Path::isEmpty() const
	{
	return m_path->isEmpty();
	}

	String Path::debugString() const
	{
	QString ret;
	for (int i = 0; i < m_path->elementCount(); ++i) {
	const QPainterPath::Element &cur = m_path->elementAt(i);

	switch (cur.type) {
	case QPainterPath::MoveToElement:
	ret += QString("M %1 %2").arg(cur.x).arg(cur.y);
	break;
	case QPainterPath::LineToElement:
	ret += QString("L %1 %2").arg(cur.x).arg(cur.y);
	break;
	case QPainterPath::CurveToElement:
	{
	const QPainterPath::Element &c1 = m_path->elementAt(i + 1);
	const QPainterPath::Element &c2 = m_path->elementAt(i + 2);

	Q_ASSERT(c1.type == QPainterPath::CurveToDataElement);
	Q_ASSERT(c2.type == QPainterPath::CurveToDataElement);

	ret += QString("C %1 %2 %3 %4 %5 %6").arg(cur.x).arg(cur.y).arg(c1.x).arg(c1.y).arg(c2.x).arg(c2.y);

	i += 2;
	break;
	}
	case QPainterPath::CurveToDataElement:
	Q_ASSERT(false);
	break;
	}
	}

	return ret;
	}

	void Path::apply(void* info, PathApplierFunction function) const
	{
	PathElement pelement;
	FloatPoint points[2];
	pelement.points = points;
	for (int i = 0; i < m_path->elementCount(); ++i) {
	const QPainterPath::Element& cur = m_path->elementAt(i);

	switch (cur.type) {
	case QPainterPath::MoveToElement:
	pelement.type = PathElementMoveToPoint;
	pelement.points[0] = QPointF(cur);
	function(info, &pelement);
	break;
	case QPainterPath::LineToElement:
	pelement.type = PathElementAddLineToPoint;
	pelement.points[0] = QPointF(cur);
	function(info, &pelement);
	break;
	case QPainterPath::CurveToElement:
	{
	const QPainterPath::Element& c1 = m_path->elementAt(i + 1);
	const QPainterPath::Element& c2 = m_path->elementAt(i + 2);

	Q_ASSERT(c1.type == QPainterPath::CurveToDataElement);
	Q_ASSERT(c2.type == QPainterPath::CurveToDataElement);

	pelement.type = PathElementAddCurveToPoint;
	pelement.points[0] = QPointF(cur);
	pelement.points[1] = QPointF(c1);
	pelement.points[2] = QPointF(c2);
	function(info, &pelement);

	i += 2;
	break;
	}
	case QPainterPath::CurveToDataElement:
	Q_ASSERT(false);
	}
	}
	}

	void Path::transform(const AffineTransform& transform)
	{
	if (m_path) {
	QMatrix mat = transform;
	QPainterPath temp = mat.map(*m_path);
	delete m_path;
	m_path = new QPainterPath(temp);
	}
	}

	}

	// vim: ts=4 sw=4 et