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48 lines
1.2 KiB
Python
48 lines
1.2 KiB
Python
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import numpy as np
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from constants import *
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from mobject.types.vectorized_mobject import VectorizedPoint
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# TODO: Rather than using VectorizedPoint, there should be some UndisplayedPointSet type
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class ValueTracker(VectorizedPoint):
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"""
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Note meant to be displayed. Instead the position encodes some
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number, often one which another animation or continual_animation
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uses for its update function, and by treating it as a mobject it can
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still be animated and manipulated just like anything else.
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"""
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def __init__(self, value=0, **kwargs):
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VectorizedPoint.__init__(self, **kwargs)
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self.set_value(value)
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def get_value(self):
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return self.get_center()[0]
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def set_value(self, value):
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self.move_to(value * RIGHT)
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return self
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def increment_value(self, d_value):
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self.set_value(self.get_value() + d_value)
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class ExponentialValueTracker(ValueTracker):
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"""
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Operates just like ValueTracker, except it encodes the value as the
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exponential of a position coordinate, which changes how interpolation
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behaves
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"""
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def get_value(self):
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return np.exp(self.get_center()[0])
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def set_value(self, value):
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self.move_to(np.log(value) * RIGHT)
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return self
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