graphs.py 文件源码

def shape(self):
        """Return a more accurate shape for this item so that
        mouse hovering is more accurate"""
        path = QtGui.QPainterPath()
        path.addEllipse(QtCore.QRectF(-5, -5, 14, 14)) #this is directly related to inits parameter. -3, -3, 6, 6.
        return path