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; }