how to use setDragMode in QGraphicsView to draw a circle when user drags over figure

[thierry Joel]

I know how to use the setDragMode in QGraphicsView to allow the user draw a rectangle on figure. I want an easy way to be able to do the same thing only this time around, when the user clicks and drags on the figure, a circle should be drawn, and not a rectangle. I dont know if that is possible, but i would really appreciate your suggestions.

Here is a section of my code:

void Scene::setMode(Mode mode){
    sceneMode = mode;
    QGraphicsView::DragMode vMode =
            QGraphicsView::NoDrag;
    if(mode == DrawCircle){
        makeItemsControllable(false);
        vMode = QGraphicsView::RubberBandDrag;
    }
    else if(mode == DrawRect){
        makeItemsControllable(true);
        vMode = QGraphicsView::RubberBandDrag;
    }
    QGraphicsView* mView = views().at(0);
    if(mView)
        mView->setDragMode(vMode);
}
 
void Scene::makeItemsControllable(bool areControllable){
    foreach(QGraphicsItem* item, items()){
        item->setFlag(QGraphicsItem::ItemIsSelectable,
                      areControllable);
        item->setFlag(QGraphicsItem::ItemIsMovable,
                      areControllable);
    }
}

void Scene::setMode(Mode mode){
    sceneMode = mode;
    QGraphicsView::DragMode vMode =
            QGraphicsView::NoDrag;
    if(mode == DrawCircle){
        makeItemsControllable(false);
        vMode = QGraphicsView::RubberBandDrag;
    }
    else if(mode == DrawRect){
        makeItemsControllable(true);
        vMode = QGraphicsView::RubberBandDrag;
    }
    QGraphicsView* mView = views().at(0);
    if(mView)
        mView->setDragMode(vMode);
}

void Scene::makeItemsControllable(bool areControllable){
    foreach(QGraphicsItem* item, items()){
        item->setFlag(QGraphicsItem::ItemIsSelectable,
                      areControllable);
        item->setFlag(QGraphicsItem::ItemIsMovable,
                      areControllable);
    }
}

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When mode == DrawCircle, i want the user to be able to drag and draw a circle on the figure instead of a rectangle. Thanks in advance.