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105 lines
3.1 KiB
105 lines
3.1 KiB
14 years ago
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#include <QPainter>
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#include "edge.h"
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#include "node.h"
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#include <math.h>
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static const double Pi = 3.14159265358979323846264338327950288419717;
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static double TwoPi = 2.0 * Pi;
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Edge::Edge(Node *sourceNode, Node *destNode)
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: arrowSize(10)
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{
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setAcceptedMouseButtons(0);
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source = sourceNode;
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dest = destNode;
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source->addEdge(this);
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dest->addEdge(this);
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adjust();
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setZValue(1);
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}
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Node *Edge::sourceNode() const
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{
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return source;
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}
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Node *Edge::destNode() const
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{
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return dest;
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}
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void Edge::adjust()
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{
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if (!source || !dest)
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return;
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QLineF line(mapFromItem(source, 0, 0) + source->boundingRect().center(),
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mapFromItem(dest, 0, 0) + dest->boundingRect().center());
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qreal length = line.length();
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prepareGeometryChange();
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if (length > qreal(20.)) {
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// QPointF edgeOffset((line.dx() * 10) / length, (line.dy() * 10) / length);
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// QPointF sourceOffset( );
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// if ( source->contains( source->boundingRect().center() + source->boundingRect().height() / 2 / tan(line.angle())),
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// source->boundingRect().width() / 2 )
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// {
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// sourcePoint = line.p1() + QPointF( , tan( line.angle() ) * source->boundingRect().height() / 2 );
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// }
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sourcePoint = line.p1();
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destPoint = line.p2();
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} else {
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sourcePoint = destPoint = line.p1();
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}
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}
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QRectF Edge::boundingRect() const
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{
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if (!source || !dest)
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return QRectF();
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qreal penWidth = 1;
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qreal extra = (penWidth + arrowSize) / 2.0;
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return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(),
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destPoint.y() - sourcePoint.y()))
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.normalized()
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.adjusted(-extra, -extra, extra, extra);
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}
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void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
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{
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if (!source || !dest)
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return;
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QLineF line(sourcePoint, destPoint);
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if (qFuzzyCompare(line.length(), qreal(0.)))
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return;
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// Draw the line itself
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painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
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painter->drawLine(line);
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// Draw the arrows
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double angle = ::acos(line.dx() / line.length());
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if (line.dy() >= 0)
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angle = TwoPi - angle;
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// QPointF sourceArrowP1 = sourcePoint + QPointF(sin(angle + Pi / 3) * arrowSize,
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// cos(angle + Pi / 3) * arrowSize);
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// QPointF sourceArrowP2 = sourcePoint + QPointF(sin(angle + Pi - Pi / 3) * arrowSize,
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// cos(angle + Pi - Pi / 3) * arrowSize);
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QPointF destArrowP1 = destPoint + QPointF(sin(angle - Pi / 3) * arrowSize,
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cos(angle - Pi / 3) * arrowSize);
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QPointF destArrowP2 = destPoint + QPointF(sin(angle - Pi + Pi / 3) * arrowSize,
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cos(angle - Pi + Pi / 3) * arrowSize);
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painter->setBrush(Qt::black);
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// painter->drawPolygon(QPolygonF() << line.p1() << sourceArrowP1 << sourceArrowP2);
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painter->drawPolygon(QPolygonF() << line.p2() << destArrowP1 << destArrowP2);
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}
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