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127 lines
3.2 KiB
127 lines
3.2 KiB
#include <QPainter>
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#include <QDebug>
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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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: m_arrowSize(7)
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{
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setAcceptedMouseButtons(0);
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m_sourceNode = sourceNode;
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m_destNode = destNode;
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m_sourceNode->addEdge(this);
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m_destNode->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 m_sourceNode;
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}
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Node *Edge::destNode() const
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{
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return m_destNode;
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}
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/// @note This is brute force. Isn't there a simple fv for this?
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QPointF firstNotContainedPoint(const QLineF &line,
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const QRectF &rect,
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bool reverse = false)
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{
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if (reverse)
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{
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for (qreal t = 1; t!=0; t-=0.01)
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{
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if (!rect.contains(line.pointAt(t))) return line.pointAt(t);
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}
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}
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else
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{
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for (qreal t = 0; t!=1; t+=0.01)
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{
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if (!rect.contains(line.pointAt(t))) return line.pointAt(t);
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}
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}
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return QPoint(0,0);
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}
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void Edge::adjust()
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{
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if (!m_sourceNode || !m_destNode)
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return;
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prepareGeometryChange();
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QLineF line(mapFromItem(m_sourceNode, 0, 0) + m_sourceNode->boundingRect().center(),
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mapFromItem(m_destNode, 0, 0) + m_destNode->boundingRect().center());
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qreal length = line.length();
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if (length > qreal(20.)) {
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QPointF sourceOffset(firstNotContainedPoint(line,m_sourceNode->sceneBoundingRect()));
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QPointF destOffset(firstNotContainedPoint(line,m_destNode->sceneBoundingRect(),true));
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m_sourcePoint = sourceOffset;
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m_destPoint = destOffset;
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} else {
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m_sourcePoint = m_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 (!m_sourceNode || !m_destNode)
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return QRectF();
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qreal penWidth = 1;
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qreal extra = (penWidth + m_arrowSize) / 2.0;
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return QRectF(m_sourcePoint, QSizeF(m_destPoint.x() - m_sourcePoint.x(),
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m_destPoint.y() - m_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 (!m_sourceNode || !m_destNode)
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return;
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QLineF line(m_sourcePoint, m_destPoint);
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if (sourceNode()->collidesWithItem(destNode()))
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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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if (line.length() < m_arrowSize)
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return;
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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 destArrowP1 = m_destPoint + QPointF(sin(angle - Pi / 3) * m_arrowSize,
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cos(angle - Pi / 3) * m_arrowSize);
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QPointF destArrowP2 = m_destPoint + QPointF(sin(angle - Pi + Pi / 3) * m_arrowSize,
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cos(angle - Pi + Pi / 3) * m_arrowSize);
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painter->setBrush(Qt::black);
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painter->drawPolygon(QPolygonF() << line.p2() << destArrowP1 << destArrowP2);
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}
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