File indexing completed on 2024-05-19 04:36:37

 /* 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 "EllipseShape.h"
 #include "NodeItem.h"
 
 #include <tikz/core/Style.h>
 #include <tikz/core/tikz.h>
 
 #include <cmath>
 
 namespace tikz {
 namespace ui {
 
 class EllipseShapePrivate
 {
     public:
 };
 
 EllipseShape::EllipseShape(NodeItem * node)
     : AbstractShape(node)
     , d(new EllipseShapePrivate())
 {
 }
 
 EllipseShape::~EllipseShape()
 {
     delete d;
 }
 
 tikz::Shape EllipseShape::type() const
 {
     return tikz::Shape::ShapeCircle;
 }
 
 void EllipseShape::adjustShapeRect(const QRectF & textRect, QRectF & shapeRect) const
 {
     // see pgflibraryshapes.geometric.code.tex
 
     // calculate radius of textRect
     qreal w = textRect.width() / 2.0 + node()->style()->innerSep().toPoint();
     qreal h = textRect.height() / 2.0 + node()->style()->innerSep().toPoint();
 
     w *= 1.4142136;
     h *= 1.4142136;
 
     // make sure the circle around textRect is contained in shapeRect
     if (2.0 * w > shapeRect.width()) {
         shapeRect.setWidth(2.0 * w);
     }
     if (2.0 * h > shapeRect.height()) {
         shapeRect.setHeight(2.0 * h);
     }
 }
 
 QPainterPath EllipseShape::shape() const
 {
     QPainterPath path;
     path.addEllipse(node()->shapeRect());
     return path;
 }
 
 QPainterPath EllipseShape::outline() const
 {
     const qreal lw = node()->style()->penWidth().toPoint() / 2;
     QRectF rect = node()->shapeRect();
     rect.adjust(-lw, -lw, lw, lw);
 
     QPainterPath path;
     path.addEllipse(rect);
     return path;
 }
 
 QStringList EllipseShape::supportedAnchors() const
 {
     // by default, just return NoAnchor
     const QStringList anchors = QStringList()
         << QString()
         << QStringLiteral("center")
         << QStringLiteral("north")
         << QStringLiteral("north east")
         << QStringLiteral("east")
         << QStringLiteral("south east")
         << QStringLiteral("south")
         << QStringLiteral("south west")
         << QStringLiteral("west")
         << QStringLiteral("north west");
     return anchors;
 }
 
 QPointF EllipseShape::anchorPos(const QString & anchor) const
 {
     if (anchor.isEmpty()) {
         return QPointF(0, 0);
     }
 
     const QRectF shapeRect = node()->shapeRect();
     const qreal rx = shapeRect.width() / 2.0 + node()->style()->outerSep().toPoint();
     const qreal ry = shapeRect.height() / 2.0 + node()->style()->outerSep().toPoint();
 
     if (anchor == QStringLiteral("center")) {
         return QPointF(0, 0);
     } else if (anchor == QStringLiteral("north")) {
         return QPointF(0, ry);
     } else if (anchor == QStringLiteral("north east")) {
         return QPointF(rx, ry) * 0.70710678;
     } else if (anchor == QStringLiteral("east")) {
         return QPointF(rx, 0);
     } else if (anchor == QStringLiteral("south east")) {
         return QPointF(rx, -ry) * 0.70710678;
     } else if (anchor == QStringLiteral("south")) {
         return QPointF(0, -ry);
     } else if (anchor == QStringLiteral("south west")) {
         return QPointF(-rx, -ry) * 0.70710678;
     } else if (anchor == QStringLiteral("west")) {
         return QPointF(-rx, 0);
     } else if (anchor == QStringLiteral("north west")) {
         return QPointF(-rx, ry) * 0.70710678;
     }
 
     tikz::warn("The shape 'ellipse' does not support anchor '" + anchor + "'.");
 
     return QPointF(0, 0);
 }
 
 QPointF EllipseShape::contactPoint(const QString & anchor, qreal rad) const
 {
     if (! anchor.isEmpty()) {
         return anchorPos(anchor);
     }
 
     const QRectF shapeRect = node()->shapeRect();
     const qreal rx = shapeRect.width() / 2.0 + node()->style()->outerSep().toPoint();
     const qreal ry = shapeRect.height() / 2.0 + node()->style()->outerSep().toPoint();
 
     // use polar coordinates to calculate contact point
     const qreal xcosphi = ry * std::cos(rad);
     const qreal ysinphi = rx * std::sin(rad);
     const qreal denominator = sqrt(xcosphi * xcosphi + ysinphi * ysinphi);
     const qreal d = qFuzzyCompare(denominator, 0.0) ? 0 : rx * ry / denominator;
 
     return d * QPointF(std::cos(rad), std::sin(rad));
 }
 
 }
 }
 
 // kate: indent-width 4; replace-tabs on;