/*

 * 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>

#define _USE_MATH_DEFINES

#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