def __create_launcher(self, run_root):
		launcher = self.__task.data['backend']['launcher']
		return self.__launcher_mgr.create_launcher(launcher, run_root)
def getR(self):
        # x 分量與 y 分量
        x = self.p1.x - self.p2.x
        y = self.p1.y - self.p2.y
        return math.sqrt(x * x + y * y)