[Solved] Restrict the movement of QGraphicsItem

Thanatos.jsse

Hello Qt DevNet.

I'm working with a graphicItem like a "Elastic Nodes" (Qt example), but i can't restrict the movement of graphicItem to one axis.
I re-implemented the functions mousePressEvent, mouseReleaseEvent and mouseMoveEvent but without success.

I need a orientation.

Thanks for your time.
Best Regards.

? Offline

can u post code of your reimplemented methods here

baysmith

See the example code in the docs for the "QGraphicsItem::itemChange()":http://doc.qt.nokia.com/4.7/qgraphicsitem.html#itemChange. The example restricts an item to a rect, but similar code could restrict it to one axis.

Thanatos.jsse

Ok Bradley, I'm going to check this...
Thanks.

Thanatos.jsse

Well, I first add the next atribute: @QPointF oldPosition@

I reimplemented a QGraphicsItem::mousePressEvent() and QGraphicsItem::itemChange(), like the example say.eimplemented a QGraphicsItem::mousePressEvent() and QGraphicsItem::itemChange(), like example say.

@void Node::mousePressEvent(QGraphicsSceneMouseEvent *event) {
oldPoint = pos();
update();
QGraphicsItem::mousePressEvent(event);
}

QVariant Node::itemChange(GraphicsItemChange change, const QVariant &value) {

QPointF newPoint = value.toPointF();

if (change == ItemPositionChange && scene()) {
    if (newPoint.y() != oldPoint.y())
        newPoint.setY(oldPoint.y());

    return newPoint;
}
return QGraphicsItem::itemChange(change, value);

}@

Thanks.