Qt 5.6 | Qt Widgets | Stickman Example | node.cpp Example File

Qt 5.6.3 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;
      }