from geometry import AcceleratedPositionable


class TouchPoint(AcceleratedPositionable):
    """
    Representation of an object touching the screen. The simplest form of a
    touch object is a 'point', represented by an (x, y) position and a TUIO
    session id (sid).  All dimensions are in pixels.
    """
    def __init__(self, x, y, sid):
        super(TouchPoint, self).__init__(x, y)
        self.sid = sid

        # List of all windows this point is located in
        self.windows = []

    def __str__(self):
        return '<%s at (%s, %s) sid=%d>' \
               % (self.__class__.__name__, self.x, self.y, self.sid)

    def add_window(self, window):
        self.windows.append(window)

    def remove_window(self, window):
        self.windows.remove(window)

    def update_window_trackers(self, event_type):
        for window in self.windows:
            window.update_trackers(event_type, self)


# TODO: Extend with more complex touch object, e.g.:
#class TouchFiducial(TouchPoint): ...