CurvePoint.py 文件源码

def __init__(self, curve, index=0, pos=None, rotate=True):
        """Position can be set either as an index referring to the sample number or
        the position 0.0 - 1.0
        If *rotate* is True, then the item rotates to match the tangent of the curve.
        """

        GraphicsObject.__init__(self)
        #QObjectWorkaround.__init__(self)
        self._rotate = rotate
        self.curve = weakref.ref(curve)
        self.setParentItem(curve)
        self.setProperty('position', 0.0)
        self.setProperty('index', 0)

        if hasattr(self, 'ItemHasNoContents'):
            self.setFlags(self.flags() | self.ItemHasNoContents)

        if pos is not None:
            self.setPos(pos)
        else:
            self.setIndex(index)