- Qt 5.5
- Qt Widgets
- Stickman Example
- node.cpp Example File
- Qt 5.5.1 Reference Documentation

# node.cpp Example File

animation/stickman/node.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the QtCore module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
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    **   * Redistributions of source code must retain the above copyright
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    **     from this software without specific prior written permission.
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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;
    }