int xref=0;
int yref=0;
int oldmousex=0;
int oldmousey=0;

class MyReceiver : public IEventReceiver
{
    public:
        virtual bool OnEvent(const SEvent& event)
        {
			if (event.EventType == EET_MOUSE_INPUT_EVENT) 
			{
				xref = oldmousex - event.MouseInput.X;
				yref = oldmousey - event.MouseInput.Y;
				oldmousex = event.MouseInput.X;
				oldmousey = event.MouseInput.Y;
				return true;
			}
            return false;
        }

};