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147 lines
3.7 KiB
147 lines
3.7 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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const double Edge::m_pi = 3.14159265358979323846264338327950288419717;
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const double Edge::m_twoPi = 2.0 * Edge::m_pi;
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const qreal Edge::m_arrowSize = 7;
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Edge::Edge(Node *sourceNode, Node *destNode)
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: m_angle(-1)
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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,true);
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m_destNode->addEdge(this,false);
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adjust();
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}
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Edge::~Edge()
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{
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m_sourceNode->removeEdgeFromList(this);
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m_destNode->removeEdgeFromList(this);
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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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* The precision is not the best either
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*/
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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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double Edge::getAngle() const
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{
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return m_angle;
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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) +
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m_sourceNode->boundingRect().center(),
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mapFromItem(m_destNode, 0, 0) +
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m_destNode->boundingRect().center());
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if (line.length() > qreal(20.)) {
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m_sourcePoint = firstNotContainedPoint(line,
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m_sourceNode->sceneBoundingRect());
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m_destPoint = firstNotContainedPoint(line,
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m_destNode->sceneBoundingRect(),true);
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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().adjusted(-extra, -extra, extra, extra);
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}
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void Edge::paint(QPainter *painter,
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const QStyleOptionGraphicsItem *,
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QWidget *w)
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{
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Q_UNUSED(w);
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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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m_angle = ::acos(line.dx() / line.length());
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if (line.dy() >= 0)
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m_angle = Edge::m_twoPi - m_angle;
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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,
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1,
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Qt::SolidLine,
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Qt::RoundCap,
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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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QPointF destArrowP1 = m_destPoint +
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QPointF(sin(m_angle - Edge::m_pi / 3) * m_arrowSize,
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cos(m_angle - Edge::m_pi / 3) * m_arrowSize);
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QPointF destArrowP2 = m_destPoint +
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QPointF(sin(m_angle - Edge::m_pi + Edge::m_pi / 3) * m_arrowSize,
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cos(m_angle - Edge::m_pi + Edge::m_pi / 3) * m_arrowSize);
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painter->setBrush(Qt::black);
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painter->drawPolygon(QPolygonF() << line.p2()
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<< destArrowP1
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<< destArrowP2);
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}
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