Preliminarily done with Chapter 10 animations

animation/simple_animations.py

@@ -68,7 +68,7 @@ class Write(ShowCreation):
         if "run_time" not in kwargs:
             self.establish_run_time(mobject)
         if "lag_factor" not in kwargs:
-            self.lag_factor = self.run_time - 1            
+            self.lag_factor = max(self.run_time - 1, 1)
         ShowCreation.__init__(self, mobject, **kwargs)
 
     def establish_run_time(self, mobject):

eola/chapter3.py

@@ -1083,12 +1083,14 @@ class MatrixVectorMultiplicationAbstract(MatrixVectorMultiplication):
     }
 
 class ColumnsToBasisVectors(LinearTransformationScene):
+    CONFIG = {
+        "t_matrix" : [[3, 1], [1, 2]]
+    }
     def construct(self):
         self.setup()
-        transposed_matrix = [[3, 1], [1, 2]]
         vector_coords = [-1, 2]
 
-        vector = self.move_matrix_columns(transposed_matrix, vector_coords)
+        vector = self.move_matrix_columns(self.t_matrix, vector_coords)
         self.scale_and_add(vector, vector_coords)
         self.dither(3)
 
@@ -1096,6 +1098,7 @@ class ColumnsToBasisVectors(LinearTransformationScene):
         matrix = np.array(transposed_matrix).transpose()
         matrix_mob = Matrix(matrix)
         matrix_mob.to_corner(UP+LEFT)
+        matrix_mob.add_background_to_entries()
         col1 = VMobject(*matrix_mob.get_mob_matrix()[:,0])
         col1.highlight(X_COLOR)
         col2 = VMobject(*matrix_mob.get_mob_matrix()[:,1])

eola/matrix.py

@@ -48,8 +48,8 @@ def vector_coordinate_label(vector_mob, integer_labels = True,
         shift_dir -= label.get_right() + DEFAULT_MOBJECT_TO_MOBJECT_BUFFER*RIGHT
     label.shift(shift_dir)
     label.highlight(color)
-    background = BackgroundRectangle(label)
-    label.submobjects = [background] + label.submobjects
+    label.rect = BackgroundRectangle(label)
+    label.add_to_back(label.rect)
     return label
 
 class Matrix(VMobject):

eola/two_d_space.py

@@ -394,6 +394,9 @@ class LinearTransformationScene(VectorScene):
     def get_vector_movement(self, func):
         for v in self.moving_vectors:
             v.target = Vector(func(v.get_end()), color = v.get_color())
+            norm = np.linalg.norm(v.target.get_end())
+            if norm < 0.1:
+                v.target.get_tip().scale_in_place(norm)
         return self.get_piece_movement(self.moving_vectors)
 
     def get_transformable_label_movement(self):

mobject/vectorized_mobject.py

@@ -200,6 +200,7 @@ class VMobject(Mobject):
         it comes time to display.
         """
         subpath_mobject = self.copy()#TODO, better way?
+        # subpath_mobject = VMobject()
         subpath_mobject.is_subpath = True
         subpath_mobject.set_points(points)
         self.add(subpath_mobject)

topics/characters.py

@@ -248,8 +248,8 @@ class Bubble(SVGMobject):
         self.content = mobject
         return self.content
 
-    def write(self, text):
-        self.add_content(TextMobject(text))
+    def write(self, *text):
+        self.add_content(TextMobject(*text))
         return self
 
     def clear(self):
@@ -414,15 +414,19 @@ class TeacherStudentsScene(Scene):
             self.play(Blink(pi_creature))
             self.dither()
 
-    def change_student_modes(self, *modes):
+    def change_student_modes(self, *modes, **kwargs):
+        added_anims = kwargs.get("added_anims", [])
         pairs = zip(self.get_students(), modes)
         start = VGroup(*[s for s, m in pairs])
         target = VGroup(*[s.copy().change_mode(m) for s, m in pairs])
-        self.play(Transform(
-            start, target, 
-            submobject_mode = "lagged_start",
-            run_time = 2
-        ))
+        self.play(
+            Transform(
+                start, target, 
+                submobject_mode = "lagged_start",
+                run_time = 2
+            ),
+            *added_anims
+        )
 
 
     def zoom_in_on_thought_bubble(self, radius = SPACE_HEIGHT+SPACE_WIDTH):

topics/geometry.py

@@ -203,6 +203,9 @@ class Arrow(Line):
         self.add(self.tip)
         self.init_colors()
 
+    def get_tip(self):
+        return self.tip
+
     def scale(self, scale_factor):
         Line.scale(self, scale_factor)
         if self.preserve_tip_size_when_scaling:

topics/numerals.py

@@ -3,10 +3,9 @@
 from mobject.vectorized_mobject import VMobject
 from mobject.tex_mobject import TexMobject
 from animation import Animation
+from scene import Scene
 from helpers import *
 
-
-
 class DecimalNumber(VMobject):
     CONFIG = {
         "num_decimal_points" : 2,
@@ -30,57 +29,66 @@ class DecimalNumber(VMobject):
                 buff = self.digit_to_digit_buff
             )
 
+#Todo, this class is now broken
 
-
-class RangingValues(Animation):
+class RangingValue(Animation):
     CONFIG = {
         "num_decimal_points" : 2,
         "rate_func" : None,
-        "tracking_function" : None,
-        "value_function" : None,
         "tracked_mobject" : None,
         "tracked_mobject_next_to_kwargs" : {},
-        "scale_factor" : None
+        "scale_factor" : None,
+        "color" : WHITE,
     }
-    def __init__(self, start_val = 0, end_val = 1, **kwargs):
+    def __init__(self, value_function, **kwargs):
+        """
+        Value function should return a real value 
+        depending on the state of the surrounding scene    
+        """
         digest_config(self, kwargs, locals())
-        Animation.__init__(self, self.get_mobject_at_alpha(0), **kwargs)
+        self.update_mobject()
+        Animation.__init__(self, self.mobject, **kwargs)
 
-    def update_mobject(self, alpha):
-        target = self.get_mobject_at_alpha(alpha)
-        self.mobject.submobjects = target.submobjects
-
-    def get_number(self, alpha):
-        if self.value_function:
-            return self.value_function(alpha)
-        return interpolate(self.start_val, self.end_val, alpha)
-
-    def get_mobject_at_alpha(self, alpha):
-        mob = DecimalNumber(
-            self.get_number(alpha), 
-            num_decimal_points=self.num_decimal_points
+    def update_mobject(self, alpha = 0):
+        mobject = DecimalNumber(
+            self.value_function(),
+            num_decimal_points = self.num_decimal_points,
+            color = self.color,
         )
+        if not hasattr(self, "mobject"):
+            self.mobject = mobject
+        else:
+            self.mobject.points = mobject.points
+            self.mobject.submobjects = mobject.submobjects
         if self.scale_factor:
-            mob.scale(self.scale_factor)
-        if self.tracking_function:
-            self.tracking_function(alpha, mob)
+            self.mobject.scale(self.scale_factor)
         elif self.tracked_mobject:
-            mob.next_to(
+            self.mobject.next_to(
                 self.tracked_mobject,
                 **self.tracked_mobject_next_to_kwargs
             )
-        return mob
+        return self
+
+
+class RangingValueScene(Scene):
+    CONFIG = {
+        "ranging_values" : []
+    }
+
+    def add_ranging_value(self, value_function, **kwargs):
+        self.ranging_values.append(
+            RangingValue(value_function, **kwargs)
+        )
+
+    def update_frame(self, *args, **kwargs):
+        for val in self.ranging_values:
+            self.remove(val.mobject)
+            val.update_mobject()
+            self.add(val.mobject)
+        return Scene.update_frame(self, *args, **kwargs)
+
+
+
+
 
-    def set_tracking_function(self, func):
-        """
-        func shoudl be of the form func(alpha, mobject), and
-        should dictate where to place running number during an 
-        animation
-        """
-        self.tracking_function = func
 
-    def set_value_function(self, func):
-        """
-        func must be of the form alpha->number
-        """
-        self.value_function = func