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47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
from __future__ import absolute_import
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from constants import *
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from animation.animation import Animation
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from utils.config_ops import digest_config
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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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def __init__(self, mobject, update_function, **kwargs):
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digest_config(self, kwargs, locals())
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Animation.__init__(self, mobject, **kwargs)
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def update_mobject(self, alpha):
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self.update_function(self.mobject)
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class UpdateFromAlphaFunc(UpdateFromFunc):
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def update_mobject(self, alpha):
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self.update_function(self.mobject, alpha)
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class MaintainPositionRelativeTo(Animation):
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CONFIG = {
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"tracked_critical_point" : ORIGIN
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}
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def __init__(self, mobject, tracked_mobject, **kwargs):
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digest_config(self, kwargs, locals())
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tcp = self.tracked_critical_point
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self.diff = mobject.get_critical_point(tcp) - \
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tracked_mobject.get_critical_point(tcp)
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Animation.__init__(self, mobject, **kwargs)
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def update_mobject(self, alpha):
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self.mobject.shift(
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self.tracked_mobject.get_critical_point(self.tracked_critical_point) - \
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self.mobject.get_critical_point(self.tracked_critical_point) + \
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self.diff
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)
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