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 /* This file is part of the TikZKit project.
  *
  * Copyright (C) 2013 Dominik Haumann <dhaumann@kde.org>
  *
  * This library is free software; you can redistribute it and/or modify
  * it under the terms of the GNU Library General Public License as published
  * by the Free Software Foundation, either version 2 of the License, or
  * (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, see
  * <http://www.gnu.org/licenses/>.
  */
 
 #include "LatexArrow.h"
 
 #include <tikz/core/Style.h>
 
 #include <QPainter>
 
 #include <cmath>
 
 class LatexArrowPrivate
 {
     public:
 };
 
 LatexArrow::LatexArrow(tikz::core::Style * style)
     : AbstractArrow(style)
     , d(new LatexArrowPrivate())
 {
 }
 
 LatexArrow::~LatexArrow()
 {
     delete d;
 }
 
 tikz::Arrow LatexArrow::type() const
 {
     return tikz::Arrow::LatexArrow;
 }
 
 QString LatexArrow::name() const
 {
     return QObject::tr("latex");
 }
 
 qreal LatexArrow::leftExtend() const
 {
     // see: pgfcorearrows.code.tex
     tikz::Value dima(0.28);
     tikz::Value dimb = style()->penWidth();
     if (style()->innerLineWidth() > 0.0) {
         dimb = 0.6 * dimb - 0.4 * style()->innerLineWidth();
     }
     dima += 0.3 * dimb;
     return -1 * dima.toPoint();
 }
 
 qreal LatexArrow::rightExtend() const
 {
     // see: pgfcorearrows.code.tex
     tikz::Value dima(0.28);
     tikz::Value dimb = style()->penWidth();
         if (style()->innerLineWidth() > 0.0) {
         dimb = 0.6 * dimb - 0.4 * style()->innerLineWidth();
     }
     dima += 0.3 * dimb;
     return 9 * dima.toPoint();
 }
 
 void LatexArrow::draw(QPainter* painter) const
 {
     // see: pgfcorearrows.code.tex
     QPainterPath p = path();
     painter->save();
 
     painter->fillPath(p, style()->penColor());
     painter->restore();
 }
 
 QPainterPath LatexArrow::path() const
 {
     // see: pgfcorearrows.code.tex
     qreal dima = tikz::Value(0.28).toPoint();
     qreal dimb = style()->penWidth().toPoint();
     if (style()->innerLineWidth() > 0.0) {
         dimb = 0.6 * dimb - 0.4 * style()->innerLineWidth().toPoint();
     }
     dima += 0.3 * dimb;
 
     QPainterPath path;
     path.moveTo(dima * QPointF(9,  0));
     path.cubicTo(dima * QPointF(6.3333, 0.5),
                  dima * QPointF(2, 2),
                  dima * QPointF(-1, 3.75));
     path.lineTo(dima * QPointF(-1, -3.75));
     path.cubicTo(dima * QPointF(2, -2),
                  dima * QPointF(6.3333, -0.5),
                  dima * QPointF(9, 0));
     path.closeSubpath();
 
     return path;
 }
 
 QPainterPath LatexArrow::contour(qreal width) const
 {
     QPainterPathStroker stroker;
     stroker.setJoinStyle(Qt::RoundJoin);
     stroker.setCapStyle(Qt::RoundCap);
     stroker.setWidth(width);
 
     return stroker.createStroke(path());
 }
 
 
 
 ReversedLatexArrow::ReversedLatexArrow(tikz::core::Style * style)
     : LatexArrow(style)
 {
 }
 
 tikz::Arrow ReversedLatexArrow::type() const
 {
     return tikz::Arrow::ReversedLatexArrow;
 }
 
 QString ReversedLatexArrow::name() const
 {
     return QObject::tr("latex reversed");
 }
 
 qreal ReversedLatexArrow::leftExtend() const
 {
     return -LatexArrow::rightExtend();
 }
 
 qreal ReversedLatexArrow::rightExtend() const
 {
     return -LatexArrow::leftExtend();
 }
 
 QPainterPath ReversedLatexArrow::path() const
 {
     QTransform trans;
     trans.scale(-1, 1);
     return trans.map(LatexArrow::path());
 }
 
 // kate: indent-width 4; replace-tabs on;