mouseMoveEvent not working in QGraphicsScene

I am trying to implement a paint program in PyQt4. In the QGraphicsScene, I use the mouseMoveEvent to draw lines connecting the consecutive mouse co-ordinates.

The code is as follows:

def mouseMoveEvent(self, event):                        
    x1 = event.pos().x()
    y1 = event.pos().y()       
    self.addLine(self.x0, self.y0, x1, y1, self.pen)    
    self.x0, self.y0 = x1, y1

x0, y0 are initialized as 0,0.

The problem I encounter is that, when I click the mousebutton a single point is drawn at (0,0), and no more drawing takes place.

The same mouseMoveEvent works perfectly in QGraphicsView. Is there anything that I'开发者_高级运维m missing?

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I figured out the problem. The above code is fine, except that event.pos() does not work in QGraphicsScene. Inorder to capture the mouseEvent's co-ordinates in QGraphicsScene, we must use event.scenePos()