Refactor many definitions out of topics and into folders within mobject

old_projects/uncertainty.py

@@ -7,40 +7,6 @@ from old_projects.fourier import *
 FREQUENCY_COLOR = RED
 USE_ALMOST_FOURIER_BY_DEFAULT = False
 
-class ValueTracker(VectorizedPoint):
-    """
-    Note meant to be displayed.  Instead the position encodes some 
-    number, often one which another animation or continual_animation
-    uses for its update function, and by treating it as a mobject it can
-    still be animated and manipulated just like anything else.
-    """
-    def __init__(self, value = 0, **kwargs):
-        VectorizedPoint.__init__(self, **kwargs)
-        self.set_value(value)
-
-    def get_value(self):
-        return self.get_center()[0]
-
-    def set_value(self, value):
-        self.move_to(value*RIGHT)
-        return self
-
-    def increment_value(self, d_value):
-        self.set_value(self.get_value() + d_value)
-
-class ExponentialValueTracker(ValueTracker):
-    """
-    Operates just like ValueTracker, except it encodes the value as the
-    exponential of a position coordinate, which changes how interpolation 
-    behaves
-    """
-    def get_value(self):
-        return np.exp(self.get_center()[0])
-
-    def set_value(self, value):
-        self.move_to(np.log(value)*RIGHT)
-        return self
-
 class GaussianDistributionWrapper(Line):
     """
     This is meant to encode a 2d normal distribution as