Line in GraphicsScene

[konvex]

Hi,
I wrote a little program, which draws a ellipse(in the scene) when I click. Now I want to draw a line if I click on the ellipse and pull(then should appear a new ellipse with the line between them).
But I have no idea how to realize..
I hope somebody can give an example or a tip.

graphicsscene.cpp

void GraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent *e)
{
pos=e->buttonDownScenePos(Qt::LeftButton);
}
 
void GraphicsScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *e)
{
pos=e->buttonDownScenePos(Qt::LeftButton);
addEllipse (pos.x()-4, pos.y()-4, 8, 8);
}

void GraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent *e)
{
pos=e->buttonDownScenePos(Qt::LeftButton);
}

void GraphicsScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *e)
{
pos=e->buttonDownScenePos(Qt::LeftButton);
addEllipse (pos.x()-4, pos.y()-4, 8, 8);
}

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