File indexing completed on 2024-05-19 04:36:33

 /* 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 "StealthArrow.h"
 
 #include <tikz/core/Style.h>
 
 #include <QPainter>
 
 #include <cmath>
 
 class StealthArrowPrivate
 {
     public:
 };
 
 StealthArrow::StealthArrow(tikz::core::Style * style)
     : AbstractArrow(style)
     , d(new StealthArrowPrivate())
 {
 }
 
 StealthArrow::~StealthArrow()
 {
     delete d;
 }
 
 tikz::Arrow StealthArrow::type() const
 {
     return tikz::Arrow::StealthArrow;
 }
 
 QString StealthArrow::name() const
 {
     return QObject::tr("stealth");
 }
 
 qreal StealthArrow::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 -3.0 * dima.toPoint();
 }
 
 qreal StealthArrow::rightExtend() const
 {
     // see: pgfcorearrows.code.tex
     qreal dima = 0.28;
     qreal dimb = style()->penWidth().toPoint();
     if (style()->innerLineWidth().toPoint() > 0.0) {
         dimb = 0.6 * dimb - 0.4 * style()->innerLineWidth().toPoint();
     }
     dima += 0.3 * dimb;
     return 5.0 * dima;
 }
 
 void StealthArrow::draw(QPainter* painter) const
 {
     // see: pgfcorearrows.code.tex
     QPainterPath p = path();
     painter->save();
     painter->fillPath(p, style()->penColor());
     painter->restore();
 }
 
 QPainterPath StealthArrow::path() const
 {
     // see: pgfcorearrows.code.tex
     qreal dima = 0.28;
     qreal dimb = style()->penWidth().toPoint();
     if (style()->innerLineWidth().toPoint() > 0.0) {
         dimb = 0.6 * dimb - 0.4 * style()->innerLineWidth().toPoint();
     }
     dima += 0.3 * dimb;
 
     QPainterPath path;
     path.moveTo(dima * QPointF( 5,  0));
     path.lineTo(dima * QPointF(-3,  4));
     path.lineTo(       QPointF( 0,  0));
     path.lineTo(dima * QPointF(-3, -4));
     path.closeSubpath();
 
     return path;
 }
 
 QPainterPath StealthArrow::contour(qreal width) const
 {
     QPainterPathStroker stroker;
     stroker.setJoinStyle(Qt::RoundJoin);
     stroker.setCapStyle(Qt::RoundCap);
     stroker.setWidth(width);
 
     return stroker.createStroke(path());
 }
 
 
 
 ReversedStealthArrow::ReversedStealthArrow(tikz::core::Style * style)
     : StealthArrow(style)
 {
 }
 
 tikz::Arrow ReversedStealthArrow::type() const
 {
     return tikz::Arrow::ReversedStealthArrow;
 }
 
 QString ReversedStealthArrow::name() const
 {
     return QObject::tr("stealth reversed");
 }
 
 qreal ReversedStealthArrow::leftExtend() const
 {
     return -StealthArrow::rightExtend();
 }
 
 qreal ReversedStealthArrow::rightExtend() const
 {
     return -StealthArrow::leftExtend();
 }
 
 QPainterPath ReversedStealthArrow::path() const
 {
     QTransform trans;
     trans.scale(-1, 1);
     return trans.map(StealthArrow::path());
 }
 // kate: indent-width 4; replace-tabs on;