multitouch/src/touch_objects.py

from geometry import AcceleratedPositionable


class TouchObject(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 unique
    object id. All dimensions are in pixels.
    """
    def __init__(self, x, y):
        super(TouchObject, self).__init__(x, y)
        self.object_id = self.create_object_id()

    def get_id(self):
        return self.object_id

    object_id_count = 0

    @classmethod
    def create_object_id(cls):
        cls.object_id_count += 1
        return cls.object_id_count


class TouchPoint(TouchObject):
    """
    Simple point touchin the scree, consisting only of an (x, y) position.
    """
    pass


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


OBJECT_NAMES = {
    'point': TouchPoint,
    #'fiducial': TouchFiducial,
}