I am working on the Analog Clock exercise and I am having a hard time getting the clock to animate. (EDIT: I made the clock animate by redrawing it every second but I still want to know if I can rotate a line without redrawing it).
Basically, my issue is that to animate the second hand of a clock (say), I would need to move ONE of the hand's endpoints and then redraw the line to reflect that.
Although Zelle's graphics library gives a natural way to translate a point or a line and redraw it on the screen (self.move(dx, dy)), there seems to be no natural way to redraw a line by moving one of its endpoints; even changing the endpoint does not redraw the line. Is there a natural way to do what I want?

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