resize and rotate handle

Hi I am trying make some resize and rotate handle of each item of class QGraphicsItem, but I have problem with it. I select my item, but I dont know what I should do to rotate or resize my item :confused: Could someone give me some hint, what I can use?
I tried it with helpful QRect and rotate with QGraphicsItem::rotate() and QGraphicsItem::scaled() but It doesnt work according to my idea before

hi,
please send the source.

hi i solve it, but only partly

Code:

---

HandleItem::HandleItem( QGraphicsItem *item, QGraphicsScene *scene,
                        QColor color, HandleItem::HandleRole role,
                        QList<HandleItem*> handles ) : QGraphicsItem( 0, scene )
{
    m_role = role;
    m_color = color;
    m_item = item;
    m_handles = handles;
    m_pressed = false;
    setZValue( 100 );
    setFlag( ItemIsMovable );
}
 
QRectF HandleItem::boundingRect() const
{
    QPointF point = m_item->boundingRect().center();
    switch( m_role ){
        case CenterHandle:
            return QRectF( point-QPointF(5, 5), QSize( 10, 10 ) );
        case RightHandle:
            point.setX( m_item->boundingRect().right() );
            return QRectF( point-QPointF(3, 5), QSize( 6, 10 ) );
        case TopHandle:
            point.setY( m_item->boundingRect().top() );
            return QRectF( point-QPointF(5, 3), QSize( 10, 6 ) );
    }
    return QRectF();
}
 
void HandleItem::paint( QPainter *paint, const QStyleOptionGraphicsItem *option, QWidget *widget )
{
    paint->setPen( m_color );
    paint->setBrush( m_color );
    QRectF rect = boundingRect();
    QVector<QPointF> points;
    switch( m_role ){
        case CenterHandle:
            paint->drawEllipse( rect );
            break;
        case RightHandle:
            points << rect.center()+QPointF(3,0) << rect.center()+QPointF(-3,-5) << rect.center()+QPointF(-3,5);
            paint->drawConvexPolygon( QPolygonF(points) );
            break;
        case TopHandle:
            points << rect.center()+QPointF(0,-3) << rect.center()+QPointF(-5,3) << rect.center()+QPointF(5,3);
            paint->drawConvexPolygon( QPolygonF(points) );
            break;
    }
}
 
void HandleItem::mousePressEvent( QGraphicsSceneMouseEvent *event )
{
    m_pressed = true;
    QGraphicsItem::mousePressEvent( event );
}
void HandleItem::mouseReleaseEvent( QGraphicsSceneMouseEvent *event )
{
    m_pressed = false;
    QGraphicsItem::mouseReleaseEvent( event );
}
 
QVariant HandleItem::itemChange( GraphicsItemChange change, const QVariant &data )
{
    if( change == ItemPositionChange && m_pressed ){
        QPointF movement = data.toPoint() - pos();
        QPointF center = m_item->boundingRect().center();
        switch( m_role ){
            case CenterHandle:
                m_item->moveBy( movement.x(), movement.y() );
                foreach( HandleItem *handle, m_handles )
                    handle->translate( movement.x(), movement.y() );
                break;
            case TopHandle:
                if( -2*movement.y() + m_item->sceneBoundingRect().height() <= 5 )
                    return QGraphicsItem::itemChange( change, pos() );
                movement.setX( 0 );
                m_item->translate( center.x(), center.y() );
                m_item->scale( 1, 1.0-2.0*movement.y() /(m_item->sceneBoundingRect().height()) );
                m_item->translate( -center.x(), -center.y() );
                break;
            case RightHandle:
                if( 2*movement.x() + m_item->sceneBoundingRect().width() <= 5 )
                    return QGraphicsItem::itemChange( change, pos() );
                movement.setY( 0 );
                m_item->translate( center.x(), center.y() );
                m_item->scale( 1.0+2.0*movement.x()/(m_item->sceneBoundingRect().width()), 1 );
                m_item->translate( -center.x(), -center.y() );
                break;
        }
        return QGraphicsItem::itemChange( change, pos()+movement );
    }
    return QGraphicsItem::itemChange( change, data );
}

---

class:

Code:

---

class HandleItem : public QGraphicsItem
{
public:
    enum HandleRole { CenterHandle, RightHandle, TopHandle };
 
    HandleItem( QGraphicsItem *item, QGraphicsScene *scene,
                QColor color, HandleRole role = CenterHandle,
                QList<HandleItem*> handles = QList<HandleItem*>() );
 
    void paint( QPainter *paint, const QStyleOptionGraphicsItem *option, QWidget *widget );
    QRectF boundingRect() const;
 
protected:
    void mousePressEvent( QGraphicsSceneMouseEvent *event );
    void mouseReleaseEvent( QGraphicsSceneMouseEvent *event );
    QVariant itemChange( GraphicsItemChange change, const QVariant &data );
 
private:
    QGraphicsItem *m_item;
    HandleRole m_role;
    QColor m_color;
    QList<HandleItem*> m_handles;
    bool m_pressed;
};

---

It is OK, but I dont know how translate coordition system to my item has CenterHandle, TopHandle and RightHandle at same pocition...
When I get mouseClick into my item CenterHandle, TopHandle and RightHandle are set well, I get mouse click next to my item CenterHandle, TopHandle and RightHandle are removed. It is OK. If I get mouseClick into my item CenterHandle, TopHandle and RightHandle are set and then I want to move my item. It is OK too. Then I click next to my item. It is OK. Then I want to move my item again, so I click into my item, but CenterHandle, TopHandle and RightHandle are set at first position(so I isnt in my item)

So I would like to ask, how I set translate or something else my item, when I change position of item.

Thanks a lot and sorry for my simple english

There is some Photo Wall application on Qt-apps.org
You can search for it and see the code. It had provided good means to rotate and resize graphics item.

wow it is great thanks :) I try it

I solved it only partly, but when I try to resize QGraphicsTextItem, i show handles in position 0,0 of all scene :(