Qt Reference Documentation

# node.cpp Example File

animation/stickman/node.cpp

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     #include "node.h"
     #include "stickman.h"

     #include <QRectF>
     #include <QPainter>
     #include <QGraphicsSceneMouseEvent>

     Node::Node(const QPointF &pos, QGraphicsItem *parent)
       : QGraphicsObject(parent), m_dragging(false)
     {
         setPos(pos);
         setFlag(QGraphicsItem::ItemSendsGeometryChanges);
     }

     Node::~Node()
     {
     }

     QRectF Node::boundingRect() const
     {
         return QRectF(-6.0, -6.0, 12.0, 12.0);
     }

     void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
     {
         painter->setPen(Qt::white);
         painter->drawEllipse(QPointF(0.0, 0.0), 5.0, 5.0);
     }

     QVariant Node::itemChange(GraphicsItemChange change, const QVariant &value)
     {
         if (change == QGraphicsItem::ItemPositionChange)
             emit positionChanged();

         return QGraphicsObject::itemChange(change, value);
     }

     void Node::mousePressEvent(QGraphicsSceneMouseEvent *)
     {
         m_dragging = true;
     }

     void Node::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
     {
         if (m_dragging)
             setPos(mapToParent(event->pos()));
     }

     void Node::mouseReleaseEvent(QGraphicsSceneMouseEvent *)
     {
         m_dragging = false;
     }