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/**************************************************************************** ** ** Copyright (C) 2006-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License versions 2.0 or 3.0 as published by the Free Software ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Alternatively you may (at ** your option) use any later version of the GNU General Public ** License if such license has been publicly approved by Trolltech ASA ** (or its successors, if any) and the KDE Free Qt Foundation. In ** addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.2, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. If ** you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech, as the sole ** copyright holder for Qt Designer, grants users of the Qt/Eclipse ** Integration plug-in the right for the Qt/Eclipse Integration to ** link to functionality provided by Qt Designer and its related ** libraries. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly ** granted herein. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ #include <QPainter> #include "edge.h" #include "node.h" #include <math.h> static const double Pi = 3.14159265358979323846264338327950288419717; static double TwoPi = 2.0 * Pi; Edge::Edge(Node *sourceNode, Node *destNode) : arrowSize(10) { setAcceptedMouseButtons(0); source = sourceNode; dest = destNode; source->addEdge(this); dest->addEdge(this); adjust(); } Edge::~Edge() { } Node *Edge::sourceNode() const { return source; } void Edge::setSourceNode(Node *node) { source = node; adjust(); } Node *Edge::destNode() const { return dest; } void Edge::setDestNode(Node *node) { dest = node; adjust(); } void Edge::adjust() { if (!source || !dest) return; QLineF line(mapFromItem(source, 0, 0), mapFromItem(dest, 0, 0)); qreal length = line.length(); QPointF edgeOffset((line.dx() * 10) / length, (line.dy() * 10) / length); prepareGeometryChange(); sourcePoint = line.p1() + edgeOffset; destPoint = line.p2() - edgeOffset; } QRectF Edge::boundingRect() const { if (!source || !dest) return QRectF(); qreal penWidth = 1; qreal extra = (penWidth + arrowSize) / 2.0; return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(), destPoint.y() - sourcePoint.y())) .normalized() .adjusted(-extra, -extra, extra, extra); } void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) { if (!source || !dest) return; // Draw the line itself QLineF line(sourcePoint, destPoint); painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin)); painter->drawLine(line); // Draw the arrows if there's enough room double angle = ::acos(line.dx() / line.length()); if (line.dy() >= 0) angle = TwoPi - angle; QPointF sourceArrowP1 = sourcePoint + QPointF(sin(angle + Pi / 3) * arrowSize, cos(angle + Pi / 3) * arrowSize); QPointF sourceArrowP2 = sourcePoint + QPointF(sin(angle + Pi - Pi / 3) * arrowSize, cos(angle + Pi - Pi / 3) * arrowSize); QPointF destArrowP1 = destPoint + QPointF(sin(angle - Pi / 3) * arrowSize, cos(angle - Pi / 3) * arrowSize); QPointF destArrowP2 = destPoint + QPointF(sin(angle - Pi + Pi / 3) * arrowSize, cos(angle - Pi + Pi / 3) * arrowSize); painter->setBrush(Qt::black); painter->drawPolygon(QPolygonF() << line.p1() << sourceArrowP1 << sourceArrowP2); painter->drawPolygon(QPolygonF() << line.p2() << destArrowP1 << destArrowP2); }
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