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41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
import operator as op
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from manimlib.animation.animation import Animation
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class UpdateFromFunc(Animation):
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"""
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update_function of the form func(mobject), presumably
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to be used when the state of one mobject is dependent
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on another simultaneously animated mobject
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"""
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CONFIG = {
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"suspend_mobject_updating": False,
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}
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def __init__(self, mobject, update_function, **kwargs):
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self.update_function = update_function
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super().__init__(mobject, **kwargs)
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def interpolate_mobject(self, alpha):
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self.update_function(self.mobject)
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class UpdateFromAlphaFunc(UpdateFromFunc):
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def interpolate_mobject(self, alpha):
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self.update_function(self.mobject, alpha)
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class MaintainPositionRelativeTo(Animation):
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def __init__(self, mobject, tracked_mobject, **kwargs):
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self.tracked_mobject = tracked_mobject
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self.diff = op.sub(
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mobject.get_center(),
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tracked_mobject.get_center(),
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)
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super().__init__(mobject, **kwargs)
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def interpolate_mobject(self, alpha):
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target = self.tracked_mobject.get_center()
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location = self.mobject.get_center()
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self.mobject.shift(target - location + self.diff)
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