Merge pull request #230 from 3b1b/eop

Eop

active_projects/alt_calc.py

@@ -47,18 +47,19 @@ class WriteOpeningWords(Scene):
 
 class StartingCalc101(PiCreatureScene):
     CONFIG = {
+        # "default_pi_creature_kwargs": {
+        #     "color": BLUE,
+        #     "flip_at_start": False,
+        # },
     }
 
     def construct(self):
         randy = self.pi_creature
-        deriv_equation = TexMobject(
+        deriv_string = "\\frac{df}{dx}(x) = \\lim(\\delta x \\to \\infty)" + \
-            "\\frac{df}{dx}(x) = \\lim(\\Delta x \\to \\infty)" +
+                       "{f(x + \\delta x) - f(x) \\over \\delta x}"
-            "{f(x + \\Delta x) - f(x) \\over \\Delta x}",
+        equations = VGroup(
-            tex_to_color_map={"\\Delta x": BLUE}
+            TexMobject(*break_up_string_by_terms(deriv_string, "\\delta x"))
         )
-        self.add(deriv_equation)
-        equations = VGroup(deriv_equation)
-
         title = TextMobject("Calculus 101")
         title.to_edge(UP)
         h_line = Line(LEFT, RIGHT)

active_projects/eop/chapter1/all_sequences.py

@@ -0,0 +1,62 @@
+from big_ol_pile_of_manim_imports import *
+from active_projects.eop.reusable_imports import *
+
+class ShuffleThroughAllSequences(Scene):
+    CONFIG = {
+        "nb_coins" : 14,
+        "run_time" : 5,
+        "fps" : int(1.0/PRODUCTION_QUALITY_FRAME_DURATION),
+        "coin_size" : 0.5,
+        "coin_spacing" : 0.65
+    }
+
+
+    def construct(self):
+
+        nb_frames = self.run_time * self.fps
+        nb_relevant_coins = int(np.log2(nb_frames)) + 1
+        print "relevant coins:", nb_relevant_coins
+        nb_idle_coins = self.nb_coins - nb_relevant_coins
+
+        idle_heads = CoinSequence(nb_idle_coins * ["H"],
+            radius = self.coin_size * 0.5,
+            spacing = self.coin_spacing)
+        idle_tails = CoinSequence(nb_idle_coins * ["T"],
+            radius = self.coin_size * 0.5,
+            spacing = self.coin_spacing)
+        idle_tails.fade(0.5)
+
+        idle_part = VGroup(idle_heads, idle_tails)
+        left_idle_part = CoinSequence(6 * ["H"],
+            radius = self.coin_size * 0.5,
+            spacing = self.coin_spacing)
+
+        self.add(idle_part, left_idle_part)
+        last_coin_seq = VGroup()
+
+        for i in range(2**nb_relevant_coins):
+            binary_seq = binary(i)
+            # pad to the left with 0s
+            nb_leading_zeroes = nb_relevant_coins - len(binary_seq)
+            for j in range(nb_leading_zeroes):
+                binary_seq.insert(0, 0)
+            seq2 = ["H" if x == 0 else "T" for x in binary_seq]
+            coin_seq = CoinSequence(seq2,
+                radius = self.coin_size * 0.5,
+                spacing = self.coin_spacing)
+            coin_seq.next_to(idle_part, LEFT, buff = self.coin_spacing - self.coin_size)
+            left_idle_part.next_to(coin_seq, LEFT, buff = self.coin_spacing - self.coin_size)
+            all_coins = VGroup(left_idle_part, coin_seq, idle_part)
+            all_coins.center()
+            self.remove(last_coin_seq)
+            self.add(coin_seq)
+            #self.wait(1.0/self.fps)
+            self.update_frame()
+            self.add_frames(self.get_frame())
+            last_coin_seq = coin_seq
+            print float(i)/2**nb_relevant_coins
+
+
+
+
+

active_projects/eop/chapter1/area_model_erf.py

@@ -84,7 +84,7 @@ class IllustrateAreaModelErf(GraphScene):
             
         equals_sign = TexMobject("=").next_to(cdf_formula, buff = MED_LARGE_BUFF)
 
-        cdf_value = DecimalNumber(0, color = graph.color, num_decimal_points = 3)
+        cdf_value = DecimalNumber(0, color = graph.color, num_decimal_places = 3)
         cdf_value.next_to(equals_sign)
         self.play(
             FadeIn(equals_sign),
@@ -99,13 +99,13 @@ class IllustrateAreaModelErf(GraphScene):
         self.add(ContinualChangingDecimal(
             decimal_number_mobject = cdf_value,
             number_update_func = integral_update_func,
-            num_decimal_points = 3
+            num_decimal_places = 3
         ))
 
         self.add(ContinualChangingDecimal(
             decimal_number_mobject = cdf_percentage,
             number_update_func = integral_update_func_percent,
-            num_decimal_points = 1
+            num_decimal_places = 1
         ))
 
 

active_projects/eop/chapter1/brick_row_scene.py

@@ -5,7 +5,7 @@ from active_projects.eop.reusable_imports import *
 class BrickRowScene(PiCreatureScene):
 
 
-    def split_tallies(self, direction = DOWN):
+    def split_tallies(self, row, direction = DOWN):
         # Split all tally symbols at once and move the copies
         # either horizontally on top of the brick row
         # or diagonally into the bricks
@@ -15,12 +15,12 @@ class BrickRowScene(PiCreatureScene):
 
         tally_targets_left = [
             rect.get_center() + 0.25 * rect.get_width() * LEFT 
-            for rect in self.row.rects
+            for rect in row.rects
         ]
 
         tally_targets_right = [
             rect.get_center() + 0.25 * rect.get_width() * RIGHT 
-            for rect in self.row.rects
+            for rect in row.rects
         ]
 
         if np.all(direction == LEFT) or np.all(direction == RIGHT):
@@ -63,7 +63,7 @@ class BrickRowScene(PiCreatureScene):
 
 
 
-    def tally_split_animations(self, direction = DOWN):
+    def tally_split_animations(self, row, direction = DOWN):
         # Just creates the animations and returns them
         # Execution can be timed afterwards
         # Returns two lists: first all those going left, then those to the right
@@ -73,12 +73,12 @@ class BrickRowScene(PiCreatureScene):
 
         tally_targets_left = [
             rect.get_center() + 0.25 * rect.get_width() * LEFT 
-            for rect in self.row.rects
+            for rect in row.rects
         ]
 
         tally_targets_right = [
             rect.get_center() + 0.25 * rect.get_width() * RIGHT 
-            for rect in self.row.rects
+            for rect in row.rects
         ]
 
         if np.all(direction == LEFT) or np.all(direction == RIGHT):
@@ -122,13 +122,14 @@ class BrickRowScene(PiCreatureScene):
         return anims1, anims2
 
 
-    def split_tallies_at_once(self, direction = DOWN):
+
-        anims1, anims2 = self.tally_split_animations(direction = direction)
+    def split_tallies_at_once(self, row, direction = DOWN):
+        anims1, anims2 = self.tally_split_animations(row, direction = direction)
         self.play(*(anims1 + anims2))
 
-    def split_tallies_in_two_steps(self, direction = DOWN):
+    def split_tallies_in_two_steps(self, row, direction = DOWN):
         # First all those to the left, then those to the right
-        anims1, anims2 = self.tally_split_animations(direction = direction)
+        anims1, anims2 = self.tally_split_animations(row, direction = direction)
         self.play(*anims1)
         self.wait(0.3)
         self.play(*anims2)
@@ -136,31 +137,31 @@ class BrickRowScene(PiCreatureScene):
 
 
 
-    def merge_rects_by_subdiv(self):
+    def merge_rects_by_subdiv(self, row):
 
-        half_merged_row = self.row.copy()
+        half_merged_row = row.copy()
         half_merged_row.subdiv_level += 1
         half_merged_row.generate_points()
-        half_merged_row.move_to(self.row)
+        half_merged_row.move_to(row)
 
         self.play(FadeIn(half_merged_row))
-        self.remove(self.row)
+        self.remove(row)
-        self.row = half_merged_row
+        return half_merged_row
 
 
 
 
-    def merge_tallies(self, target_pos = UP):
+    def merge_tallies(self, row, target_pos = UP):
 
-        r = self.row.subdiv_level
+        r = row.subdiv_level
         
         if np.all(target_pos == DOWN):
             tally_targets = [
                 rect.get_center()
-                for rect in self.row.get_rects_for_level(r)
+                for rect in row.get_rects_for_level(r)
             ]
         elif np.all(target_pos == UP):
-            y_pos = self.row.get_center()[1] + 1.2 * 0.5 * self.row.get_height()
+            y_pos = row.get_center()[1] + 1.2 * 0.5 * row.get_height()
             for target in tally_targets:
                 target[1] = y_pos
         else:
@@ -186,25 +187,25 @@ class BrickRowScene(PiCreatureScene):
         self.tallies.add(self.tallies_copy[-1])
 
 
-    def merge_rects_by_coloring(self):
+    def merge_rects_by_coloring(self, row):
 
-        merged_row = self.row.copy()
+        merged_row = row.copy()
         merged_row.coloring_level += 1
         merged_row.generate_points()
-        merged_row.move_to(self.row)
+        merged_row.move_to(row)
 
         self.play(FadeIn(merged_row))
-        self.remove(self.row)
+        self.remove(row)
-        self.row = merged_row
+        return merged_row
 
 
 
-    def move_tallies_on_top(self):
+    def move_tallies_on_top(self, row):
         self.play(
-            self.tallies.shift, 1.2 * 0.5 * self.row.height * UP
+            self.tallies.shift, 1.2 * 0.5 * row.height * UP
         )
         for tally in self.tallies:
-            tally.anchor += 1.2 * 0.5 * self.row.height * UP
+            tally.anchor += 1.2 * 0.5 * row.height * UP
 
     def create_pi_creature(self):
         randy = CoinFlippingPiCreature(color = MAROON_E)
@@ -256,12 +257,11 @@ class BrickRowScene(PiCreatureScene):
         # # # # # # # #
 
 
-
         self.play(FlipCoin(randy))
 
         self.play(SplitRectsInBrickWall(self.row))
-        self.merge_rects_by_subdiv()
+        self.row = self.merge_rects_by_subdiv(self.row)
-        self.merge_rects_by_coloring()
+        self.row = self.merge_rects_by_coloring(self.row)
         #
         # put tallies on top
 
@@ -312,7 +312,6 @@ class BrickRowScene(PiCreatureScene):
             new_tails[i].shift(COIN_SEQUENCE_SPACING * DOWN)
         self.play(FadeIn(new_tails))
 
-
         decimal_tallies = VGroup()
         # introduce notion of tallies
         for (i, rect) in enumerate(self.row.get_rects_for_level(2)):
@@ -347,6 +346,7 @@ class BrickRowScene(PiCreatureScene):
         )
         self.wait()
 
+
         self.tallies = VGroup()
         for (i, rect) in enumerate(self.row.get_rects_for_level(2)):
             tally = TallyStack(2-i, i, show_decimals = False)
@@ -357,6 +357,7 @@ class BrickRowScene(PiCreatureScene):
         self.play(FadeIn(self.tallies))
         self.wait()
 
+
         anims = []
         for (decimal_tally, tally_stack) in zip(decimal_tallies, self.tallies):
             anims.append(ApplyFunction(
@@ -366,6 +367,7 @@ class BrickRowScene(PiCreatureScene):
         self.play(*anims)
         self.wait()
 
+
         # replace the original decimal tallies with
         # the ones that belong to the TallyStacks
         for (decimal_tally, tally_stack) in zip(decimal_tallies, self.tallies):
@@ -374,9 +376,9 @@ class BrickRowScene(PiCreatureScene):
             tally_stack.add(tally_stack.decimal_tally)
         
         self.add_foreground_mobject(self.tallies)
-        self.merge_rects_by_subdiv()
+        self.row = self.merge_rects_by_subdiv(self.row)
         self.wait()
-        self.merge_rects_by_coloring()
+        self.row = self.merge_rects_by_coloring(self.row)
         self.wait()
         
 
@@ -494,7 +496,7 @@ class BrickRowScene(PiCreatureScene):
         )
         self.wait()
 
-        self.split_tallies_in_two_steps()
+        self.split_tallies_in_two_steps(self.row)
         self.wait()
 
         self.add_foreground_mobject(self.tallies)
@@ -554,7 +556,7 @@ class BrickRowScene(PiCreatureScene):
 
         # self.wait()
 
-        # self.merge_rects_by_subdiv()
+        # self.row = self.merge_rects_by_subdiv(self.row)
         # self.wait()
 
         # self.play(
@@ -575,9 +577,9 @@ class BrickRowScene(PiCreatureScene):
 
         # self.wait()
 
-        # self.merge_tallies(target_pos = DOWN)
+        # self.merge_tallies(self.row, target_pos = DOWN)
         # self.add_foreground_mobject(self.tallies)
-        # self.merge_rects_by_coloring()
+        # self.row = self.merge_rects_by_coloring(self.row)
         # self.wait()
 
 
@@ -645,7 +647,7 @@ class BrickRowScene(PiCreatureScene):
 
         self.wait()
 
-        self.merge_rects_by_subdiv()
+        self.row = self.merge_rects_by_subdiv(self.row)
         self.wait()
 
         self.play(
@@ -666,9 +668,9 @@ class BrickRowScene(PiCreatureScene):
 
         self.wait()
 
-        self.merge_tallies(target_pos = DOWN)
+        self.merge_tallies(self.row, target_pos = DOWN)
         self.add_foreground_mobject(self.tallies)
-        self.merge_rects_by_coloring()
+        self.row = self.merge_rects_by_coloring(self.row)
         self.wait()
 
         
@@ -677,11 +679,18 @@ class BrickRowScene(PiCreatureScene):
             with_labels = True,
             inset = True)
         self.play(FadeOut(self.tallies))
-        self.play(LaggedStart(
-            FadeIn, outcomes))
         self.wait()
         self.play(LaggedStart(
-            FadeOut, outcomes))
+            FadeIn, outcomes,
+            #rate_func = there_and_back_with_pause,
+            run_time = 5))
+        self.wait()
+        self.play(LaggedStart(
+            FadeOut, outcomes,
+            #rate_func = there_and_back_with_pause,
+            run_time = 5))
+
+        self.wait()
         self.play(FadeIn(self.tallies))
 
         brace1 = Brace(self.row.rects[2], UP)
@@ -705,21 +714,37 @@ class BrickRowScene(PiCreatureScene):
         )
         self.wait()
 
+
+
+        # put visuals for other probability distribtuions here
+
+        # back to three coin flips, show all 8 outcomes
+        run_time = 5
+        self.play(
+            LaggedStart(FadeIn, outcomes,
+                #rate_func = there_and_back_with_pause,
+                run_time = run_time),
+            FadeOut(self.tallies,
+                run_time = run_time)
+        )
+        self.wait()
+        self.play(
+            LaggedStart(FadeOut, outcomes,
+                #rate_func = there_and_back_with_pause,
+                run_time = 5),
+            FadeIn(self.tallies,
+                run_time = run_time)
+        )
+
+
+
+
         # # # # # # # #
         # FOURTH FLIP #
         # # # # # # # #
 
 
 
-        # removing the tallies (boy are they sticky)
-        self.play(FadeOut(self.tallies))
-        self.remove(self.tallies, self.tallies_copy)
-        for tally in self.tallies:
-            self.remove_foreground_mobject(tally)
-            self.remove(tally)
-        for tally in self.tallies_copy:
-            self.remove_foreground_mobject(tally)
-            self.remove(tally)
         
         previous_row = self.row.copy()
         self.add(previous_row)
@@ -727,26 +752,16 @@ class BrickRowScene(PiCreatureScene):
         v = 1.25 * self.row.height * UP
         self.play(
             previous_row.shift, v,
-            #self.decimals.shift, v,
+            self.tallies.shift, v,
-            #self.decimal_copies.shift, v
-        )
-
-        self.add(self.row)
-        self.bring_to_back(self.row)
-        self.row.shift(v)
-
-        w = 1.5 * self.row.height * DOWN
-        self.play(
-            self.row.shift, w,
-            Animation(previous_row)
         )
+        self.add_foreground_mobject(self.tallies)
 
         self.play(
             SplitRectsInBrickWall(self.row)
         )
         self.wait()
 
-        self.merge_rects_by_subdiv()
+        self.row = self.merge_rects_by_subdiv(self.row)
 
         self.wait()
 
@@ -754,7 +769,10 @@ class BrickRowScene(PiCreatureScene):
         k = 1 # tally to split
 
         # show individual outcomes
-        outcomes = previous_row.get_outcome_rects_for_level(n, with_labels = False)
+        outcomes = previous_row.get_outcome_rects_for_level(n,
+            with_labels = False,
+            inset = True
+        )
         grouped_outcomes = VGroup()
         index = 0
         for i in range(n + 1):
@@ -779,7 +797,10 @@ class BrickRowScene(PiCreatureScene):
 
         #self.revert_to_original_skipping_status()
 
-        target_outcomes = self.row.get_outcome_rects_for_level(n + 1, with_labels = False)
+        target_outcomes = self.row.get_outcome_rects_for_level(n + 1,
+            with_labels = False,
+            inset = True
+        )
         grouped_target_outcomes = VGroup()
         index = 0
         old_tally_sizes = [choose(n,i) for i in range(n + 1)]
@@ -813,6 +834,13 @@ class BrickRowScene(PiCreatureScene):
         
         self.wait()
 
+        # fade in new tallies
+        new_rects = self.row.get_rects_for_level(4)
+        new_tallies = VGroup(*[
+            TallyStack(n + 1 - i, i).move_to(rect) for (i, rect) in enumerate(new_rects)
+        ])
+        self.play(FadeIn(new_tallies))
+        self.add_foreground_mobject(new_tallies[1])
         # remove outcomes and sizes except for one tally
         anims = []
         for i in range(n + 1):
@@ -820,6 +848,11 @@ class BrickRowScene(PiCreatureScene):
                 anims.append(FadeOut(grouped_outcomes_copy[i]))
             if i != k:
                 anims.append(FadeOut(grouped_outcomes[i]))
+                anims.append(FadeOut(new_tallies[i]))
+
+        #anims.append(FadeOut(self.tallies[0]))
+        #anims.append(FadeOut(self.tallies[2:]))
+        anims.append(FadeOut(new_tallies[-1]))
 
         self.play(*anims)
 
@@ -828,64 +861,69 @@ class BrickRowScene(PiCreatureScene):
         self.play(
             Transform(grouped_outcomes_copy[k - 1], original_grouped_outcomes[k - 1])
         )
+
         self.play(
             Transform(grouped_outcomes[k], original_grouped_outcomes[k])
         )
 
-
         new_rects = self.row.get_rects_for_level(n + 1)
 
-        #decimals_copy = self.decimals.copy()
-        #decimals_copy2 = self.decimals.copy()
-
         self.play(
             Transform(grouped_outcomes[k][0],grouped_target_outcomes[k][0][old_tally_sizes[k - 1]:]),
-            Transform(grouped_outcomes_copy[k - 1][0],grouped_target_outcomes[k][0][:old_tally_sizes[k]]),
+            Transform(grouped_outcomes_copy[k - 1][0],grouped_target_outcomes[k][0][:old_tally_sizes[k - 1]]),
-            #decimals_copy[k - 1].move_to, new_rects[k],
+        )
-            #decimals_copy2[k].move_to, new_rects[k],
+
+        self.play(
+            FadeOut(previous_row),
+            FadeOut(self.tallies),
+        )
+
+        self.row = self.merge_rects_by_coloring(self.row)
+
+        self.play(
+            FadeIn(new_tallies[0]),
+            FadeIn(new_tallies[2:]),
         )
 
 
-        # # # # # # # #
-        # FIFTH  FLIP #
-        # # # # # # # #
 
-        # self.remove(
+
-        #     grouped_outcomes,
+        # # # # # # # # # #
-        #     grouped_outcomes_copy,
+        # EVEN MORE FLIPS #
-        #     grouped_target_outcomes,
+        # # # # # # # # # #
-        #     target_outcomes,
+
-        #     outcomes,
+        self.play(FadeOut(new_tallies))
-        #     previous_row,
-        #     original_grouped_outcomes)
         self.clear()
         self.add(randy, self.row)       
-        #self.row.shift(0.5 * UP)        
         
-        #return
 
-        self.merge_rects_by_coloring()
+        for i in range(3):
-
-        self.revert_to_original_skipping_status()
-
-        for i in range(1):
 
             self.play(FlipCoin(randy))
 
             self.wait()
 
+            previous_row = self.row.copy()
+
+            self.play(previous_row.shift, 1.25 * self.row.height * UP)
+
             self.play(
                 SplitRectsInBrickWall(self.row)
             )
             self.wait()
-
+            self.row = self.merge_rects_by_subdiv(self.row)
-
-            #self.split_tallies_at_once(direction = LEFT)
             self.wait()
-            self.merge_rects_by_subdiv()
+            self.row = self.merge_rects_by_coloring(self.row)
-            self.wait()
-            #self.merge_tallies(direction = LEFT)
-            self.merge_rects_by_coloring()
-            #self.merge_decimals()
             self.wait()
 
+            self.play(FadeOut(previous_row))
+
+
+
+
+
+
+
+
+
+

active_projects/eop/chapter1/entire_brick_wall.py

@@ -1,29 +1,31 @@
 
 from big_ol_pile_of_manim_imports import *
 from active_projects.eop.reusable_imports import *
+from active_projects.eop.chapter1.brick_row_scene import BrickRowScene
 
-
+class EntireBrickWall(BrickRowScene):
-class EntireBrickWall(Scene):
 
     def construct(self):
 
+        self.remove(self.get_primary_pi_creature())
+
         row_height = 0.3
         nb_rows = 20
         start_point = 3 * UP + 1 * LEFT
         
         rows = VMobject()
         rows.add(BrickRow(0, height = row_height))
-        rows[0].move_to(start_point)
+        rows.move_to(start_point)
         self.add(rows)
             
         zero_counter = Integer(0).next_to(start_point + 0.5 * rows[0].width * RIGHT)
         nb_flips_text = TextMobject("\# of flips")
         nb_flips_text.next_to(zero_counter, RIGHT, buff = LARGE_BUFF)
         self.add(zero_counter, nb_flips_text)
+        flip_counters = VGroup(zero_counter)
 
-        for i in range(1,nb_rows + 1):
+        for i in range(1, nb_rows + 1):
-            rows.add(BrickRow(i, height = row_height))
+            rows.add(rows[-1].copy())
-            rows[-1].move_to(start_point + (i - 1) * row_height * DOWN)
             self.bring_to_back(rows[-1])
             anims = [
                 rows[-1].shift, row_height * DOWN,
@@ -33,10 +35,17 @@ class EntireBrickWall(Scene):
             if i % 5 == 0:
                 counter = Integer(i)
                 counter.next_to(rows[-1].get_right() + row_height * DOWN, RIGHT)
+                flip_counters.add(counter)
                 anims.append(FadeIn(counter))
 
             self.play(*anims)
 
+            self.play(SplitRectsInBrickWall(rows[-1]))
+            rows.submobjects[-1] = self.merge_rects_by_subdiv(rows[-1])
+            rows.submobjects[-1] = self.merge_rects_by_coloring(rows[-1])
+
+
+
         # draw indices under the last row for the number of tails
         tails_counters = VGroup()
         for (i, rect) in enumerate(rows[-1].rects):
@@ -62,10 +71,73 @@ class EntireBrickWall(Scene):
             FadeIn(nb_tails_text)
         )
 
-        special_brick_copy = rows[-1].rects[13].copy()
+        # remove any hidden brick rows
+        self.clear()
+        self.add(nb_flips_text)
+
+        mobs_to_shift = VGroup(
+            rows, flip_counters, tails_counters, nb_tails_text, 
+        )
+        self.play(mobs_to_shift.shift, 3 * UP)
+
+        last_row_rect = SurroundingRectangle(rows[-1], buff = 0)
+        last_row_rect.set_stroke(color = YELLOW, width = 6)
+
         self.play(
             rows.fade, 0.9,
-            FadeIn(special_brick_copy)
+            ShowCreation(last_row_rect)
+        )
+
+        def highlighted_brick(row = 20, nb_tails = 10):
+            brick_copy = rows[row].rects[nb_tails].copy()
+            brick_copy.set_fill(color = YELLOW, opacity = 0.8)
+            prob_percentage = float(choose(row, nb_tails)) / 2**row * 100
+            brick_label = DecimalNumber(prob_percentage,
+                unit = "\%", num_decimal_places = 1, color = BLACK)
+            brick_label.move_to(brick_copy)
+            brick_label.scale_to_fit_height(0.8 * brick_copy.get_height())
+            return VGroup(brick_copy, brick_label)
+
+        highlighted_bricks = [
+            highlighted_brick(row = 20, nb_tails = i)
+            for i in range(20)
+        ]
+
+        self.play(
+            FadeIn(highlighted_bricks[10])
+        )
+
+        self.play(
+            FadeOut(highlighted_bricks[10]),
+            FadeIn(highlighted_bricks[9]),
+            FadeIn(highlighted_bricks[11]),
+        )
+
+        self.play(
+            FadeOut(highlighted_bricks[9]),
+            FadeOut(highlighted_bricks[11]),
+            FadeIn(highlighted_bricks[8]),
+            FadeIn(highlighted_bricks[12]),
         )
 
 
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

active_projects/eop/chapter1/morph_brick_row_into_histogram.py

@@ -9,6 +9,7 @@ class GenericMorphBrickRowIntoHistogram(Scene):
         "bar_width" : 2.0,
         "bar_anchor_height" : -3.0,
         "show_tallies" : False,
+        "show_nb_flips" : True
     }
 
     def construct(self):
@@ -25,13 +26,23 @@ class GenericMorphBrickRowIntoHistogram(Scene):
 
             for (i,brick) in enumerate(self.row.rects):
                 tally = TallyStack(self.level - i, i)
-                tally.next_to(brick, UP)
+                tally.move_to(brick)
                 self.add(tally)
                 tallies.add(tally)
                 brick.set_stroke(width = 3)
 
+        if self.show_nb_flips:
+            nb_flips_text = TextMobject("\# of flips: " + str(self.level))
+            nb_flips_text.to_corner(UR)
+            self.add(nb_flips_text)
+
         self.remove(self.row.subdivs, self.row.border)
 
+        for rect in self.row.rects:
+            rect.set_stroke(color = WHITE, width = 3)
+
+        self.play(self.row.rects.space_out_submobjects, {"factor" : 1.3})
+
         anims = []
         for brick in self.row.rects:
             anims.append(brick.rotate)
@@ -50,11 +61,10 @@ class GenericMorphBrickRowIntoHistogram(Scene):
         self.play(*anims)
 
         self.bars.create_outline()
-
+        anims = [
-        anims = []
+            ApplyMethod(rect.set_stroke, {"width" : 0})
-        for bar in self.bars.submobjects:
+                for rect in self.bars
-            anims.append(bar.set_stroke)
+        ]
-            anims.append({"width" : 0})
         anims.append(FadeIn(self.bars.outline))
         self.play(*anims)
 
@@ -67,7 +77,8 @@ class MorphBrickRowIntoHistogram3(GenericMorphBrickRowIntoHistogram):
         "prob_denominator" : 8,
         "bar_width" : 2.0,
         "bar_anchor_height" : -3.0,
-        "show_tallies" : True
+        "show_tallies" : True,
+        "show_nb_flips" : False
     }
 
     def construct(self):
@@ -90,55 +101,71 @@ class MorphBrickRowIntoHistogram3(GenericMorphBrickRowIntoHistogram):
         nb_tails_label = TextMobject("\# of tails")
         nb_tails_label.next_to(x_labels[-1], RIGHT, MED_LARGE_BUFF)
 
+
+
+        # draw y-guides
+
+        y_guides = VMobject()
+        for i in range(0,self.prob_denominator + 1):
+            y_guide = Line(5 * LEFT, 5 * RIGHT, stroke_color = GRAY)
+            y_guide.move_to(self.bar_anchor_height * UP + i * float(self.row.width) / self.prob_denominator * UP)
+            y_guide_label = TexMobject("{" + str(i) + "\over " + str(self.prob_denominator) + "}", color = GRAY)
+            y_guide_label.scale(0.7)
+            y_guide_label.next_to(y_guide, LEFT)
+            if i != 0:
+                y_guide.add(y_guide_label)
+            y_guides.add(y_guide)
+
+        self.play(
+            FadeIn(y_guides),
+            Animation(self.bars.outline),
+            Animation(self.bars)
+        )
+
         self.play(
             FadeIn(x_axis),
             FadeIn(x_labels),
             FadeIn(nb_tails_label)
         )
 
+        self.add_foreground_mobject(nb_tails_label)
+        area_color = YELLOW
 
+        total_area_text = TextMobject("total area =", color = area_color)
+        area_decimal = DecimalNumber(0, color = area_color, num_decimal_places = 3)
+        area_decimal.next_to(total_area_text, RIGHT)
 
-        # draw y-guides
+        total_area_group = VGroup(total_area_text, area_decimal)
+        total_area_group.move_to(2.7 * UP)
 
-        y_guides = VMobject()
+        self.play(
-        for i in range(1,self.prob_denominator + 1):
+            FadeIn(total_area_text),
-            y_guide = Line(5 * LEFT, 5 * RIGHT, stroke_color = GRAY)
+        )
-            y_guide.move_to(self.bar_anchor_height * UP + i * float(self.row.width) / self.prob_denominator * UP)
-            y_guide_label = TexMobject("{" + str(i) + "\over " + str(self.prob_denominator) + "}", color = GRAY)
-            y_guide_label.scale(0.7)
-            y_guide_label.next_to(y_guide, LEFT)
-            y_guide.add(y_guide_label)
-            y_guides.add(y_guide)
 
-        self.bring_to_back(y_guides)
+        cumulative_areas = [0.125, 0.5, 0.875, 1]
-        self.play(FadeIn(y_guides), Animation(self.bars))
+        covering_rects = self.bars.copy()
+        for (i,rect) in enumerate(covering_rects):
+            rect.set_fill(color = area_color, opacity = 0.5)
+            self.play(
+                FadeIn(rect, rate_func = linear),
+                ChangeDecimalToValue(area_decimal, cumulative_areas[i],
+                    rate_func = linear)
+            )
+            self.wait(0.2)
 
+        self.wait()
 
-        total_area_text = TextMobject("total area = 1", color = YELLOW)
+        total_area_rect = SurroundingRectangle(
-        total_area_rect = SurroundingRectangle(total_area_text,
+            total_area_group,
             buff = MED_SMALL_BUFF,
-            fill_opacity = 0.5,
+            stroke_color = area_color
-            fill_color = BLACK,
-            stroke_color = YELLOW
         )
 
         self.play(
-            Write(total_area_text),
+            FadeOut(covering_rects),
             ShowCreation(total_area_rect)
         )
 
-        prob_dist_text = TextMobject("probability distribution", color = YELLOW)
-        prob_dist_text.to_corner(UP, buff = LARGE_BUFF)
-        prob_dist_rect = SurroundingRectangle(prob_dist_text,
-            buff = MED_SMALL_BUFF,
-            stroke_color = YELLOW
-        )
-
-        self.play(
-            Write(prob_dist_text),
-            ShowCreation(prob_dist_rect)
-        )
-
 
 
 class MorphBrickRowIntoHistogram20(GenericMorphBrickRowIntoHistogram):
@@ -165,8 +192,8 @@ class MorphBrickRowIntoHistogram20(GenericMorphBrickRowIntoHistogram):
             label.next_to(self.bar_anchors[i], DOWN)
             x_labels.add(label)
 
-        nb_tails_label = TextMobject("\# of heads")
+        nb_tails_label = TextMobject("\# of tails")
-        nb_tails_label.next_to(x_labels[-1], RIGHT, MED_LARGE_BUFF)
+        nb_tails_label.move_to(5 * RIGHT + 2.5 * DOWN)
 
         self.play(
             FadeIn(x_axis),
@@ -186,7 +213,7 @@ class MorphBrickRowIntoHistogram20(GenericMorphBrickRowIntoHistogram):
             y_guide_height = self.bar_anchor_height + i * float(self.row.width)
             y_guide_heights.append(y_guide_height)
             y_guide.move_to(y_guide_height * UP)
-            y_guide_label = DecimalNumber(i, num_decimal_points = 2, color = GRAY)
+            y_guide_label = DecimalNumber(i, num_decimal_places = 2, color = GRAY)
             y_guide_label.scale(0.7)
             y_guide_label.next_to(y_guide, LEFT)
             y_guide.add(y_guide_label)
@@ -199,7 +226,7 @@ class MorphBrickRowIntoHistogram20(GenericMorphBrickRowIntoHistogram):
         histogram_height = self.bars.get_height()
 
         # scale to fit screen
-        self.scale_x = 10.0/(len(self.bars) * self.bar_width)
+        self.scale_x = 10.0/((len(self.bars) - 1) * self.bar_width)
         self.scale_y = 6.0/histogram_height
 
 

active_projects/eop/chapter1/prob_dist_visuals.py

@@ -14,15 +14,25 @@ class ProbabilityDistributions(PiCreatureScene):
     def construct(self):
 
         lag_ratio = 0.2
-        run_time = 5
+        run_time = 3
+        
+
+        text = TextMobject("Probability distributions", color = YELLOW)
+        text.to_edge(UP)
+        text_rect = SurroundingRectangle(text, buff = MED_SMALL_BUFF)
+
+        self.play(
+            FadeIn(text),
+            ShowCreation(text_rect)
+        )
 
 
 # WEATHER FORECAST
 
 
         unit_rect = Rectangle(
-            height = 4, width = 4
+            height = 3, width = 3
-        )
+        ).shift(DOWN)
 
         p_rain = 0.23
         p_sun = 1 - p_rain
@@ -38,7 +48,7 @@ class ProbabilityDistributions(PiCreatureScene):
         sun_rect.set_fill(color = YELLOW, opacity = opacity)
         sun_rect.set_stroke(width = 0)
 
-        self.add(unit_rect, rain_rect, sun_rect)
+        self.play(FadeIn(VGroup(unit_rect, rain_rect, sun_rect)))
 
         rain = SVGMobject(file_name = "rain").scale(0.35)
         sun = SVGMobject(file_name = "sun").scale(0.35)
@@ -189,7 +199,8 @@ class ProbabilityDistributions(PiCreatureScene):
         coin_flip_rect.add(braces, labels)
 
         coin_flip_rect.target  = coin_flip_rect.copy().scale(0.6)
-        coin_flip_rect.target.to_corner(UR, buff = LARGE_BUFF)
+        coin_flip_rect.target.to_corner(UR, buff = MED_LARGE_BUFF)
+        coin_flip_rect.target.shift(DOWN)
 
         self.play(
             MoveToTarget(coin_flip_rect)
@@ -255,25 +266,3 @@ class ProbabilityDistributions(PiCreatureScene):
             rate_func=there_and_back_with_pause,
             run_time=run_time
         )
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-

active_projects/eop/chapter1/quiz_result.py

@@ -1,12 +1,14 @@
-
-
 from big_ol_pile_of_manim_imports import *
 from active_projects.eop.reusable_imports import *
 from active_projects.eop.independence import *
 
+from for_3b1b_videos.pi_class import PiCreatureClass
 
-class QuizResult(Scene):
+class QuizResult(PiCreatureScene):
-
+    CONFIG = {
+        "pi_creatures_start_on_screen" : False,
+        "random_seed" : 6
+    }
     def construct(self):
 
 
@@ -23,14 +25,15 @@ class QuizResult(Scene):
             return quiz
 
 
-        highlight_color = YELLOW
+        highlight_color = WHITE
 
         nb_students_x = 5
         nb_students_y = 3
         spacing_students_x = 2.0
         spacing_students_y = 2.2
 
-        all_students = VGroup()
+        all_students = PiCreatureClass(
+            width = nb_students_x, height = nb_students_y)# VGroup()
         student_points = []
         grades = []
         grades_count = []
@@ -39,9 +42,10 @@ class QuizResult(Scene):
             for j in range(nb_students_y):
                 x = i * spacing_students_x
                 y = j * spacing_students_y
-                pi = PiCreature().scale(0.3)
+                #pi = PiCreature().scale(0.3)
-                pi.move_to([x,y,0])
+                #pi.move_to([x,y,0])
-                all_students.add(pi)
+                #all_students.add(pi)
+                all_students[i*nb_students_y + j].move_to([x,y,0])
                 q1 = np.random.choice([True, False])
                 q2 = np.random.choice([True, False])
                 q3 = np.random.choice([True, False])
@@ -55,7 +59,8 @@ class QuizResult(Scene):
 
 
         all_students.move_to(ORIGIN)
-        self.add(all_students)
+        self.pi_creatures = all_students
+        self.play(FadeIn(all_students))
 
         all_quizzes = VGroup()
 
@@ -133,17 +138,20 @@ class QuizResult(Scene):
         )
         grade_hist.move_to(all_students)
 
-        self.play(FadeIn(grade_hist))
+        self.play(
+            FadeIn(grade_hist),
+            FadeOut(all_students)
+        )
 
 
         nb_students_label = TextMobject("\# of students", color = highlight_color)
-        nb_students_label.move_to(3 * LEFT + 2 * UP)
+        nb_students_label.move_to(5 * LEFT + 2 * UP)
         arrows = VGroup(*[
-            Arrow(nb_students_label, grade_hist.bars[i].get_center(),
+            Arrow(nb_students_label.get_right(), grade_hist.bars[i].get_center(),
                 color = highlight_color)
             for i in range(4)
         ])
-        self.play(Write(nb_students_label), LaggedStart(ShowCreation,arrows))
+        self.play(Write(nb_students_label), LaggedStart(GrowArrow,arrows))
 
         percentage_label = TextMobject("\% of students", color = highlight_color)
         percentage_label.move_to(nb_students_label)
@@ -151,10 +159,11 @@ class QuizResult(Scene):
         anims = []
         for (label, percentage) in zip(grade_hist.y_labels_group, percentages):
             new_label = DecimalNumber(percentage,
-                num_decimal_points = 1,
+                num_decimal_places = 1,
                 unit = "\%",
                 color = highlight_color
             )
+            new_label.scale(0.7)
             new_label.move_to(label)
             anims.append(Transform(label, new_label))
         anims.append(ReplacementTransform(nb_students_label, percentage_label))
@@ -174,8 +183,8 @@ class QuizResult(Scene):
         prob_label.move_to(percentage_label)
         self.play(
             all_students[8].set_color, MAROON_E,
-            all_students[:8].fade, 0.6,
+            #all_students[:8].fade, 0.6,
-            all_students[9:].fade, 0.6,
+            #all_students[9:].fade, 0.6,
             ReplacementTransform(percentage_label, prob_label)
         )
 
@@ -184,12 +193,32 @@ class QuizResult(Scene):
             FadeOut(arrows)
         )
 
-        for i in range(1):
+        flash_hist = FlashThroughHistogram(
-            self.play(
-                FlashThroughHistogram(
                     grade_hist,
                     direction = "vertical",
                     mode = "random",
-                    run_time = 5
+                    cell_opacity = 0.5,
+                    run_time = 5,
+                    rate_func = linear
                 )
+
+        flash_class = FlashThroughClass(
+                    all_students,
+                    mode = "random",
+                    highlight_color = MAROON_E,
+                    run_time = 5,
+                    rate_func = linear
                 )
+
+        for i in range(3):
+            self.play(flash_hist, flash_class)
+            self.remove(flash_hist.prototype_cell)
+
+
+
+
+
+
+
+
+

active_projects/eop/reusables/brick_row.py

@@ -11,7 +11,7 @@ class BrickRow(VMobject):
         "height" : 1.0,
         "width" : 8.0,
         "outcome_shrinkage_factor_x" : 0.95,
-        "outcome_shrinkage_factor_y" : 0.95
+        "outcome_shrinkage_factor_y" : 0.94
     }
 
     def __init__(self, n, **kwargs):
@@ -104,12 +104,12 @@ class BrickRow(VMobject):
             outcome_width = float(self.width) / (2 ** r)
             outcome_height = self.height
         
-        corner_radius = 0 # min(0.1, 0.3 * min(outcome_width, outcome_height))
+        corner_radius = min(0.1, 0.3 * min(outcome_width, outcome_height))
         # this scales down the corner radius for very narrow rects
-        rect = Rectangle( # RoundedRectangle(
+        rect = RoundedRectangle(
             width = outcome_width,
             height = outcome_height,
-            #corner_radius = corner_radius,
+            corner_radius = corner_radius,
             fill_color = WHITE,
             fill_opacity = 0.2,
             stroke_width = 0
@@ -205,13 +205,3 @@ class SplitRectsInBrickWall(AnimationGroup):
 
 
 
-
-
-    # def update_mobject(self, alpha):
-    #     for subdiv in self.subdivs:
-    #         x = subdiv.get_start()[0]
-    #         start = self.mobject.get_center()
-    #         start += x * RIGHT + 0.5 * self.mobject.get_height() * UP
-    #         end = start + alpha * self.mobject.get_height() * DOWN
-    #         subdiv.put_start_and_end_on(start,end)
-

active_projects/eop/reusables/histograms.py

@@ -201,7 +201,10 @@ class FlashThroughHistogram(Animation):
         "hist_opacity" : 0.2
     }
 
-    def __init__(self, mobject, direction = "horizontal", mode = "random", **kwargs):
+    def __init__(self, mobject,
+        direction = "horizontal",
+        mode = "random",
+        **kwargs):
 
         digest_config(self, kwargs)
 
@@ -277,6 +280,15 @@ class FlashThroughHistogram(Animation):
            self.mobject.remove(self.prototype_cell)
 
 
+    def clean_up(self, surrounding_scene = None):
+        Animation.clean_up(self, surrounding_scene)
+        self.update(1)
+        if surrounding_scene is not None:
+            if self.is_remover():
+                surrounding_scene.remove(self.prototype_cell)
+            else:
+                surrounding_scene.add(self.prototype_cell)
+        return self
 
 
 
@@ -290,7 +302,7 @@ class OutlineableBars(VGroup):
     # We use this to morph a row of bricks into a histogram.
 
     CONFIG = {
-        "outline_stroke_width" : 5,
+        "outline_stroke_width" : 3,
         "stroke_color" : WHITE
     }
     def create_outline(self, animated = False, **kwargs):

active_projects/eop/reusables/upright_coins.py

@@ -37,6 +37,7 @@ class UprightTails(UprightCoin):
 class CoinSequence(VGroup):
     CONFIG = {
         "sequence": [],
+        "radius" : COIN_RADIUS,
         "spacing": COIN_SEQUENCE_SPACING,
         "direction": RIGHT
     }
@@ -47,11 +48,11 @@ class CoinSequence(VGroup):
         offset = 0
         for symbol in self.sequence:
             if symbol == "H":
-                new_coin = UprightHeads()
+                new_coin = UprightHeads(radius = self.radius)
             elif symbol == "T":
-                new_coin = UprightTails()
+                new_coin = UprightTails(radius = self.radius)
             else:
-                new_coin = UprightCoin(symbol = symbol)
+                new_coin = UprightCoin(symbol = symbol, radius = self.radius)
             new_coin.shift(offset * self.direction)
             self.add(new_coin)
             offset += self.spacing

animation/numbers.py

@@ -10,7 +10,7 @@ from utils.config_ops import digest_config
 
 class ChangingDecimal(Animation):
     CONFIG = {
-        "num_decimal_points": None,
+        "num_decimal_places": None,
         "show_ellipsis": None,
         "position_update_func": None,
         "tracked_mobject": None,
@@ -21,7 +21,7 @@ class ChangingDecimal(Animation):
         self.decimal_number_config = dict(
             decimal_number_mobject.initial_config
         )
-        for attr in "num_decimal_points", "show_ellipsis":
+        for attr in "num_decimal_places", "show_ellipsis":
             value = getattr(self, attr)
             if value is not None:
                 self.decimal_number_config[attr] = value

extract_scene.py

@@ -151,11 +151,12 @@ def handle_scene(scene, **config):
 
         if config["show_file_in_finder"]:
             commands.append("-R")
-        #
+        
         if config["show_last_frame"]:
             commands.append(scene.get_image_file_path())
         else:
             commands.append(scene.get_movie_file_path())
+        #commands.append("-g")
         FNULL = open(os.devnull, 'w')
         sp.call(commands, stdout=FNULL, stderr=sp.STDOUT)
         FNULL.close()
@@ -223,8 +224,11 @@ def get_module_posix(file_name):
     module_name = file_name.replace(".py", "")
     last_module = imp.load_module(".", *imp.find_module("."))
     for part in module_name.split(os.sep):
+        try:
             load_args = imp.find_module(part, last_module.__path__)
             last_module = imp.load_module(part, *load_args)
+        except ImportError:
+            continue
     return last_module
 
 

for_3b1b_videos/pi_class.py

@@ -0,0 +1,23 @@
+import numpy as np
+import warnings
+
+from constants import *
+
+from mobject.types.vectorized_mobject import VGroup
+from for_3b1b_videos.pi_creature import PiCreature
+
+class PiCreatureClass(VGroup):
+    CONFIG = {
+        "width" : 3,
+        "height" : 2
+    }
+
+    def __init__(self, **kwargs):
+        VGroup.__init__(self, **kwargs)
+        for i in range(self.width):
+            for j in range(self.height):
+                pi = PiCreature().scale(0.3)
+                pi.move_to(i*DOWN + j* RIGHT)
+                self.add(pi)
+
+

for_3b1b_videos/pi_creature_animations.py

@@ -6,6 +6,7 @@ from mobject.mobject import Group
 
 from mobject.svg.drawings import SpeechBubble
 
+from animation.animation import Animation
 from animation.creation import ShowCreation
 from animation.creation import Write
 from animation.composition import AnimationGroup
@@ -16,6 +17,8 @@ from utils.config_ops import digest_config
 from utils.rate_functions import squish_rate_func
 from utils.rate_functions import there_and_back
 
+from for_3b1b_videos.pi_class import PiCreatureClass
+
 
 class Blink(ApplyMethod):
     CONFIG = {
@@ -101,3 +104,46 @@ class RemovePiCreatureBubble(AnimationGroup):
         self.pi_creature.bubble = None
         if surrounding_scene is not None:
             surrounding_scene.add(self.pi_creature)
+
+
+
+class FlashThroughClass(Animation):
+    CONFIG = {
+        "highlight_color" : GREEN,
+    }
+
+    def __init__(self, mobject, mode = "linear", **kwargs):
+        
+        if not isinstance(mobject, PiCreatureClass):
+            raise Exception("FlashThroughClass mobject must be a PiCreatureClass")
+        digest_config(self, kwargs)
+        self.indices = range(mobject.height * mobject.width)
+        
+        if mode == "random":
+            np.random.shuffle(self.indices)
+
+        Animation.__init__(self, mobject, **kwargs)
+        
+
+    def update_mobject(self, alpha):
+        index = int(np.floor(alpha * self.mobject.height * self.mobject.width))
+        
+        for pi in self.mobject:
+            pi.set_color(BLUE_E)
+        if index < self.mobject.height * self.mobject.width:
+            self.mobject[self.indices[index]].set_color(self.highlight_color)
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

mobject/matrix.py

@@ -139,7 +139,7 @@ class Matrix(VMobject):
 class DecimalMatrix(Matrix):
     CONFIG = {
         "element_to_mobject": DecimalNumber,
-        "element_to_mobject_config": {"num_decimal_points": 1}
+        "element_to_mobject_config": {"num_decimal_places": 1}
     }
 
 

mobject/mobject.py

@@ -623,13 +623,17 @@ class Mobject(Container):
             values = []
         values += [
             mob.reduce_across_dimension(points_func, reduce_func, dim)
-            for mob in self.submobjects
+            for mob in self.nonempty_submobjects()
         ]
         try:
             return reduce_func(values)
         except:
             return 0
 
+    def nonempty_submobjects(self):
+        return [submob for submob in self.submobjects
+            if len(submob.submobjects) != 0 or len(submob.points) != 0]
+
     def get_merged_array(self, array_attr):
         result = None
         for mob in self.family_members_with_points():
@@ -745,6 +749,7 @@ class Mobject(Container):
     def submobject_family(self):
         sub_families = map(Mobject.submobject_family, self.submobjects)
         all_mobjects = [self] + list(it.chain(*sub_families))
+        #all_mobjects = list(it.chain(*sub_families)) + [self]
         return remove_list_redundancies(all_mobjects)
 
     def family_members_with_points(self):

mobject/numbers.py

@@ -8,7 +8,7 @@ from mobject.types.vectorized_mobject import VMobject
 
 class DecimalNumber(VMobject):
     CONFIG = {
-        "num_decimal_points": 2,
+        "num_decimal_places": 2,
         "digit_to_digit_buff": 0.05,
         "show_ellipsis": False,
         "unit": None,  # Aligned to bottom unless it starts with "^"
@@ -18,7 +18,7 @@ class DecimalNumber(VMobject):
     def __init__(self, number, **kwargs):
         VMobject.__init__(self, **kwargs)
         self.number = number
-        ndp = self.num_decimal_points
+        ndp = self.num_decimal_places
 
         # Build number string
         if isinstance(number, complex):
@@ -71,5 +71,5 @@ class DecimalNumber(VMobject):
 
 class Integer(DecimalNumber):
     CONFIG = {
-        "num_decimal_points": 0,
+        "num_decimal_places": 0,
     }

mobject/svg/tex_mobject.py

@@ -5,6 +5,7 @@ from svg_mobject import VMobjectFromSVGPathstring
 from utils.config_ops import digest_config
 from utils.strings import split_string_list_to_isolate_substring
 from utils.tex_file_writing import tex_to_svg_file
+from mobject.geometry import Line
 from mobject.types.vectorized_mobject import VGroup
 from mobject.types.vectorized_mobject import VectorizedPoint
 
@@ -290,3 +291,27 @@ class TexMobjectFromPresetString(TexMobject):
         TexMobject.__init__(self, self.tex, **kwargs)
         self.set_color(self.color)
 
+
+class Title(TextMobject):
+    CONFIG = {
+        "scale_factor": 1,
+        "include_underline": True,
+        "underline_width": FRAME_WIDTH - 2,
+        # This will override underline_width
+        "match_underline_width_to_text": False,
+        "underline_buff": MED_SMALL_BUFF,
+    }
+
+    def __init__(self, text, **kwargs):
+        TextMobject.__init__(self, text, **kwargs)
+        self.scale(self.scale_factor)
+        self.to_edge(UP)
+        if self.include_underline:
+            underline = Line(LEFT, RIGHT)
+            underline.next_to(self, DOWN, buff=self.underline_buff)
+            if self.match_underline_width_to_text:
+                underline.match_width(self)
+            else:
+                underline.scale_to_fit_width(self.underline_width)
+            self.add(underline)
+            self.underline = underline

old_projects/WindingNumber.py

@@ -565,7 +565,7 @@ def walker_animation_with_display(
     number_update_func = None,
     show_arrows = True,
     scale_arrows = False,
-    num_decimal_points = 1,
+    num_decimal_places = 1,
     include_background_rectangle = True,
     **kwargs
     ):
@@ -581,7 +581,7 @@ def walker_animation_with_display(
 
     if number_update_func != None:
         display = DecimalNumber(0, 
-            num_decimal_points = num_decimal_points, 
+            num_decimal_places = num_decimal_places, 
             fill_color = WHITE if include_background_rectangle else BLACK,
             include_background_rectangle = include_background_rectangle)
         if include_background_rectangle:
@@ -732,7 +732,7 @@ class PiWalker(ColorMappedByFuncScene):
         "show_num_plane" : False,
         "draw_lines" : True,
         "num_checkpoints" : 10,
-        "num_decimal_points" : 1,
+        "num_decimal_places" : 1,
         "include_background_rectangle" : False,
     }
 
@@ -788,7 +788,7 @@ class PiWalker(ColorMappedByFuncScene):
                 number_update_func = number_update_func,
                 run_time = self.step_run_time,
                 walker_stroke_color = WALKER_LIGHT_COLOR if self.color_foreground_not_background else BLACK,
-                num_decimal_points = self.num_decimal_points,
+                num_decimal_places = self.num_decimal_places,
                 include_background_rectangle = self.include_background_rectangle,
             )
 
@@ -2751,7 +2751,7 @@ class OneFifthTwoFifthWinder(SpecifiedWinder):
         "step_size" : 0.01,
         "show_num_plane" : False,
         "step_run_time" : 6,
-        "num_decimal_points" : 2,
+        "num_decimal_places" : 2,
     }
 
 class OneFifthOneFifthWinderWithReset(OneFifthTwoFifthWinder):

old_projects/WindingNumber_G.py

@@ -386,7 +386,7 @@ class Introduce1DFunctionCase(Scene):
         )
         decimal = DecimalNumber(
             0,
-            num_decimal_points = 3,
+            num_decimal_places = 3,
             show_ellipsis = True,
         )
         decimal.scale(0.7)
@@ -484,7 +484,7 @@ class Introduce1DFunctionCase(Scene):
         if show_decimal:
             decimal = DecimalNumber(
                 axes.x_axis.point_to_number(arrow.get_start()),
-                num_decimal_points = 3,
+                num_decimal_places = 3,
                 # show_ellipsis = True,
             )
             height = self.rect.get_height()
@@ -2310,7 +2310,7 @@ class TransitionFromPathsToBoundaries(ColorMappedObjectsScene):
             )
         )
 
-        label = DecimalNumber(0, num_decimal_points = 1)
+        label = DecimalNumber(0, num_decimal_places = 1)
         label_upadte = ContinualChangingDecimal(
             label, get_total_winding,
             position_update_func = lambda l : l.next_to(dot, UP+LEFT, SMALL_BUFF)

old_projects/basel/basel.py

@@ -119,7 +119,7 @@ class LightIndicator(VMobject):
         self.foreground.set_stroke(color=INDICATOR_STROKE_COLOR,width=INDICATOR_STROKE_WIDTH)
 
         self.add(self.background, self.foreground)
-        self.reading = DecimalNumber(self.intensity,num_decimal_points = self.precision)
+        self.reading = DecimalNumber(self.intensity,num_decimal_places = self.precision)
         self.reading.set_fill(color=INDICATOR_TEXT_COLOR)
         self.reading.move_to(self.get_center())
         if self.show_reading:
@@ -287,7 +287,7 @@ class IntroScene(PiCreatureScene):
         equals_sign = self.euler_sum.get_part_by_tex("=")
 
         self.partial_sum_decimal = DecimalNumber(partial_results_values[1],
-                num_decimal_points = 2)
+                num_decimal_places = 2)
         self.partial_sum_decimal.next_to(equals_sign, RIGHT)
 
 
@@ -313,7 +313,7 @@ class IntroScene(PiCreatureScene):
                         self.partial_sum_decimal,
                         partial_results_values[i+1], 
                         run_time = self.duration,
-                        num_decimal_points = 6,
+                        num_decimal_places = 6,
                         show_ellipsis = True,
                         position_update_func = lambda m: m.next_to(equals_sign, RIGHT)
                     )
@@ -863,7 +863,7 @@ class SingleLighthouseScene(PiCreatureScene):
         # angle msmt (decimal number)
 
         self.angle_indicator = DecimalNumber(arc_angle / DEGREES,
-            num_decimal_points = 0,
+            num_decimal_places = 0,
             unit = "^\\circ",
             fill_opacity = 1.0,
             fill_color = WHITE)
@@ -4262,7 +4262,7 @@ class LabeledArc(Arc):
 
         Arc.__init__(self,angle,**kwargs)
 
-        label = DecimalNumber(self.length, num_decimal_points = 0)
+        label = DecimalNumber(self.length, num_decimal_places = 0)
         r = BUFFER * self.radius
         theta = self.start_angle + self.angle/2
         label_pos = r * np.array([np.cos(theta), np.sin(theta), 0])

old_projects/basel/basel2.py

@@ -94,7 +94,7 @@ class LightIndicator(Mobject):
         self.foreground.set_fill(color = self.fill_color)
 
         self.add(self.background, self.foreground)
-        self.reading = DecimalNumber(self.intensity,num_decimal_points = self.precision)
+        self.reading = DecimalNumber(self.intensity,num_decimal_places = self.precision)
         self.reading.set_fill(color=INDICATOR_TEXT_COLOR)
         self.reading.scale_to_fit_height(self.reading_height)
         self.reading.move_to(self.get_center())
@@ -317,7 +317,7 @@ class IntroScene(PiCreatureScene):
 
         partial_sum_decimal = self.partial_sum_decimal = DecimalNumber(
             series_terms[1],
-            num_decimal_points = 2
+            num_decimal_places = 2
         )
         partial_sum_decimal.next_to(equals_sign, RIGHT)
 
@@ -418,7 +418,7 @@ class IntroScene(PiCreatureScene):
                         partial_sum_decimal,
                         series_terms[i+1], 
                         run_time = 1,
-                        num_decimal_points = 6,
+                        num_decimal_places = 6,
                         position_update_func = lambda m: m.next_to(equals_sign, RIGHT)
                     )
                 ]
@@ -430,7 +430,7 @@ class IntroScene(PiCreatureScene):
                 ChangeDecimalToValue(
                     partial_sum_decimal,
                     series_terms[i+1],
-                    num_decimal_points = 6,
+                    num_decimal_places = 6,
                 ),
             ]
             if i == 5:
@@ -451,7 +451,7 @@ class IntroScene(PiCreatureScene):
             ChangeDecimalToValue(
                 partial_sum_decimal,
                 series_terms[-1],
-                num_decimal_points = 6,
+                num_decimal_places = 6,
             ),
             morty.change, "confused",
         )
@@ -1295,7 +1295,7 @@ class IntroduceScreen(Scene):
 
         self.angle_indicator = DecimalNumber(
             arc_angle / DEGREES,
-            num_decimal_points = 0,
+            num_decimal_places = 0,
             unit = "^\\circ"
         )
         self.angle_indicator.next_to(self.angle_arc, RIGHT)
@@ -3818,7 +3818,7 @@ class ThinkBackToHowAmazingThisIs(ThreeDScene):
         dot_pairs = it.starmap(VGroup, zip(positive_dots, negative_dots))
 
         # Decimal
-        decimal = DecimalNumber(0, num_decimal_points = 6)
+        decimal = DecimalNumber(0, num_decimal_places = 6)
         decimal.to_edge(UP)
         terms = [2./(n**2) for n in range(1, 100, 2)]
         partial_sums = np.cumsum(terms)
@@ -4250,7 +4250,7 @@ class LabeledArc(Arc):
 
         Arc.__init__(self,angle,**kwargs)
 
-        label = DecimalNumber(self.length, num_decimal_points = 0)
+        label = DecimalNumber(self.length, num_decimal_places = 0)
         r = BUFFER * self.radius
         theta = self.start_angle + self.angle/2
         label_pos = r * np.array([np.cos(theta), np.sin(theta), 0])

old_projects/fourier.py

@@ -728,7 +728,7 @@ class UnmixMixedPaint(Scene):
 class MachineThatTreatsOneFrequencyDifferently(Scene):
     def construct(self):
         graph = self.get_cosine_graph(0.5)
-        frequency_mob = DecimalNumber(220, num_decimal_points = 0)
+        frequency_mob = DecimalNumber(220, num_decimal_places = 0)
         frequency_mob.next_to(graph, UP, buff = MED_LARGE_BUFF)
 
         self.graph = graph
@@ -1273,7 +1273,7 @@ class WrapCosineGraphAroundCircle(FourierMachineScene):
     def get_winding_frequency_label(self):
         freq = self.initial_winding_frequency
         winding_freq_label = VGroup(
-            DecimalNumber(freq, num_decimal_points = 2),
+            DecimalNumber(freq, num_decimal_places = 2),
             TextMobject("cycles/second")
         )
         winding_freq_label.arrange_submobjects(RIGHT)

old_projects/fractal_dimension.py

@@ -1805,7 +1805,7 @@ class BoxCountingScene(Scene):
         return label
 
     def count_boxes(self, boxes):
-        num = DecimalNumber(len(boxes), num_decimal_points = 0)
+        num = DecimalNumber(len(boxes), num_decimal_places = 0)
         num.next_to(boxes, RIGHT)
         num.add_to_back(BackgroundRectangle(num))
 

old_projects/nn/part1.py

@@ -559,7 +559,7 @@ class WriteAProgram(Scene):
             rgb = square.fill_rgb
             num = DecimalNumber(
                 square.fill_rgb[0],
-                num_decimal_points = 1
+                num_decimal_places = 1
             )
             num.set_stroke(width = 1)
             color = rgba_to_color(1 - (rgb + 0.2)/1.2)
@@ -1113,7 +1113,7 @@ class IntroduceEachLayer(PreviewMNistNetwork):
         example_num = None
         for neuron in neurons:
             o = neuron.get_fill_opacity()
-            num = DecimalNumber(o, num_decimal_points = 1)
+            num = DecimalNumber(o, num_decimal_places = 1)
             num.scale_to_fit_width(0.7*neuron.get_width())
             num.move_to(neuron)
             if o > 0.8:

old_projects/nn/part2.py

@@ -962,14 +962,14 @@ class IntroduceCostFunction(PreviewLearning):
         terms = VGroup()
         term_updates = []
         for arrow, d1, d2 in zip(arrows, *self.decimal_groups):
-            term = DecimalNumber(0, num_decimal_points = 4)
+            term = DecimalNumber(0, num_decimal_places = 4)
             term.scale_to_fit_height(d1.get_height())
             term.next_to(arrow, LEFT)
             term.num_update_func = generate_term_update_func(d1, d2)
             terms.add(term)
             term_updates.append(ChangingDecimalWithColor(
                 term, term.num_update_func,
-                num_decimal_points = 4
+                num_decimal_places = 4
             ))
         brace.target.next_to(terms, LEFT)
 
@@ -2780,7 +2780,7 @@ class TestPerformance(PreviewLearning):
         "wrong_wait_time" : 0.5,
         "stroke_width_exp" : 2,
         "decimal_kwargs" : {
-            "num_decimal_points" : 3,
+            "num_decimal_places" : 3,
         }
     }
     def construct(self):

old_projects/nn/part3.py

@@ -671,7 +671,7 @@ class WalkThroughTwoExample(ShowAveragingCost):
         decimals = VGroup()
         for neuron in neurons:
             activation = neuron.get_fill_opacity()
-            decimal = DecimalNumber(activation, num_decimal_points = 1)
+            decimal = DecimalNumber(activation, num_decimal_places = 1)
             decimal.scale_to_fit_width(0.7*neuron.get_width())
             decimal.move_to(neuron)
             if activation > 0.8:
@@ -748,7 +748,7 @@ class WalkThroughTwoExample(ShowAveragingCost):
             anims.append(ChangingDecimal(
                 decimal,
                 get_decimal_update(decimal.number, target),
-                num_decimal_points = 1
+                num_decimal_places = 1
             ))
             anims.append(UpdateFromFunc(
                 self.decimals[i],
@@ -1076,7 +1076,7 @@ class WalkThroughTwoExample(ShowAveragingCost):
             ChangingDecimal(
                 two_decimal,
                 lambda a : interpolate(two_activation, 1, a),
-                num_decimal_points = 1,
+                num_decimal_places = 1,
             ),
             UpdateFromFunc(
                 two_decimal,
@@ -1110,7 +1110,7 @@ class WalkThroughTwoExample(ShowAveragingCost):
             ChangingDecimal(
                 two_decimal,
                 lambda a : interpolate(1, two_activation, a),
-                num_decimal_points = 1,
+                num_decimal_places = 1,
             ),
             UpdateFromFunc(
                 two_decimal,
@@ -3613,7 +3613,7 @@ class SimplestNetworkExample(PreviewLearning):
 
     def get_neuron_activation_decimal(self, neuron):
         opacity = neuron.get_fill_opacity()
-        decimal = DecimalNumber(opacity, num_decimal_points = 2)
+        decimal = DecimalNumber(opacity, num_decimal_places = 2)
         decimal.scale_to_fit_width(0.85*neuron.get_width())
         if decimal.number > 0.8:
             decimal.set_fill(BLACK)

old_projects/pi_day.py

@@ -226,7 +226,7 @@ def get_circle_drawing_terms(radius = 1, positioning_func = lambda m : m.center(
             0.25*rotate_vector(radius.get_vector(), TAU/4)
         ),
     )
-    decimal = DecimalNumber(0, num_decimal_points = 4, show_ellipsis = True)
+    decimal = DecimalNumber(0, num_decimal_places = 4, show_ellipsis = True)
     decimal.scale(0.75)
     def reposition_decimal(decimal):
         vect = radius.get_vector()
@@ -318,7 +318,7 @@ class PiTauDebate(PiCreatureScene):
         circum_line.next_to(circle, DOWN, buff = MED_LARGE_BUFF)
         # circum_line.to_edge(LEFT)
         brace = Brace(circum_line, DOWN, buff = SMALL_BUFF)
-        decimal = DecimalNumber(np.pi, num_decimal_points = 4, show_ellipsis = True)
+        decimal = DecimalNumber(np.pi, num_decimal_places = 4, show_ellipsis = True)
         decimal.scale(0.75)
         decimal.next_to(brace, DOWN, SMALL_BUFF)
 

old_projects/wallis.py

@@ -112,7 +112,7 @@ class Introduction(Scene):
             )
         get_arrow_update().update(1)
         decimal = DecimalNumber(
-            curr_product, num_decimal_points=5, show_ellipsis=True)
+            curr_product, num_decimal_places=5, show_ellipsis=True)
         decimal.next_to(arrow, UP, SMALL_BUFF, submobject_to_align=decimal[:5])
         decimal_anim = ChangingDecimal(
             decimal,
@@ -512,7 +512,7 @@ class ShowProduct(Scene):
         ])
 
         brace = braces[0].copy()
-        decimal = DecimalNumber(partial_products[0], num_decimal_points=4)
+        decimal = DecimalNumber(partial_products[0], num_decimal_places=4)
         decimal.next_to(brace, DOWN)
 
         self.add(brace, decimal, dots[0], parts[0])
@@ -677,7 +677,7 @@ class ShowProduct(Scene):
         ])
 
         brace = braces[0].copy()
-        decimal = DecimalNumber(partial_products_iter.next(), num_decimal_points=4)
+        decimal = DecimalNumber(partial_products_iter.next(), num_decimal_places=4)
         decimal.next_to(brace, DOWN)
 
         self.play(*map(FadeIn, [brace, decimal, dots[0]]))
@@ -894,7 +894,7 @@ class DistanceProductScene(MovingCameraScene):
             self.d_labels.add(d_label)
         return self.d_labels
 
-    def get_numeric_distance_labels(self, lines=None, num_decimal_points=3, show_ellipsis=True):
+    def get_numeric_distance_labels(self, lines=None, num_decimal_places=3, show_ellipsis=True):
         radius = self.circle.get_width() / 2
         if lines is None:
             if not hasattr(self, "distance_lines"):
@@ -904,7 +904,7 @@ class DistanceProductScene(MovingCameraScene):
         for line in lines:
             label = DecimalNumber(
                 line.get_length() / radius,
-                num_decimal_points=num_decimal_points,
+                num_decimal_places=num_decimal_places,
                 show_ellipsis=show_ellipsis,
                 include_background_rectangle=self.include_distance_labels_background_rectangle,
             )
@@ -943,7 +943,7 @@ class DistanceProductScene(MovingCameraScene):
 
         product_decimal = DecimalNumber(
             self.get_distance_product(fraction),
-            num_decimal_points=3,
+            num_decimal_places=3,
             show_ellipsis=True,
             include_background_rectangle=self.include_distance_labels_background_rectangle,
         )
@@ -1632,7 +1632,7 @@ class FromGeometryToAlgebra(DistanceProductScene):
         values = map(plane.point_to_number, self.get_lh_points())
         complex_decimal = self.complex_decimal = DecimalNumber(
             values[3],
-            num_decimal_points=3,
+            num_decimal_places=3,
             include_background_rectangle=True
         )
         complex_decimal.next_to(outer_arrow.get_start(), LEFT, SMALL_BUFF)
@@ -2190,7 +2190,7 @@ class PlugObserverIntoPolynomial(DistanceProductScene):
 
         numeric_chord_label = DecimalNumber(
             np.sqrt(3),
-            num_decimal_points=4,
+            num_decimal_places=4,
             include_background_rectangle=True,
             show_ellipsis=True,
         )
@@ -2907,7 +2907,7 @@ class ProveLemma2(PlugObserverIntoPolynomial):
 
         product = DecimalNumber(
             self.num_lighthouses,
-            num_decimal_points=3,
+            num_decimal_places=3,
             show_ellipsis=True
         )
         product.move_to(self.q_marks, LEFT)
@@ -3235,7 +3235,7 @@ class KeeperAndSailor(DistanceProductScene, PiCreatureScene):
 
         new_keeper_dp_decimal = DecimalNumber(
             self.num_lighthouses,
-            num_decimal_points=3,
+            num_decimal_places=3,
         )
         new_keeper_dp_decimal.replace(keeper_dp_decimal, dim_to_match=1)
         new_keeper_dp_decimal.set_color(YELLOW)

utils/rate_functions.py

@@ -4,6 +4,9 @@ from utils.bezier import bezier
 from utils.simple_functions import sigmoid
 
 
+def linear(t):
+    return t
+
 def smooth(t, inflection=10.0):
     error = sigmoid(-inflection / 2)
     return (sigmoid(inflection * (t - 0.5)) - error) / (1 - 2 * error)

utils/tex_file_writing.py

@@ -1,81 +0,0 @@
-import os
-from constants import TEX_DIR
-from constants import TEX_TEXT_TO_REPLACE
-
-
-def tex_hash(expression, template_tex_file):
-    return str(hash(expression + template_tex_file))
-
-
-def tex_to_svg_file(expression, template_tex_file):
-    tex_file = generate_tex_file(expression, template_tex_file)
-    dvi_file = tex_to_dvi(tex_file)
-    return dvi_to_svg(dvi_file)
-
-
-def generate_tex_file(expression, template_tex_file):
-    result = os.path.join(
-        TEX_DIR,
-        tex_hash(expression, template_tex_file)
-    ) + ".tex"
-    if not os.path.exists(result):
-        print("Writing \"%s\" to %s" % (
-            "".join(expression), result
-        ))
-        with open(template_tex_file, "r") as infile:
-            body = infile.read()
-            body = body.replace(TEX_TEXT_TO_REPLACE, expression)
-        with open(result, "w") as outfile:
-            outfile.write(body)
-    return result
-
-
-def get_null():
-    if os.name == "nt":
-        return "NUL"
-    return "/dev/null"
-
-
-def tex_to_dvi(tex_file):
-    result = tex_file.replace(".tex", ".dvi")
-    if not os.path.exists(result):
-        commands = [
-            "latex",
-            "-interaction=batchmode",
-            "-halt-on-error",
-            "-output-directory=" + TEX_DIR,
-            tex_file,
-            ">",
-            get_null()
-        ]
-        exit_code = os.system(" ".join(commands))
-        if exit_code != 0:
-            log_file = tex_file.replace(".tex", ".log")
-            raise Exception(
-                "Latex error converting to dvi. "
-                "See log output above or the log file: %s" % log_file)
-    return result
-
-
-def dvi_to_svg(dvi_file, regen_if_exists=False):
-    """
-    Converts a dvi, which potentially has multiple slides, into a
-    directory full of enumerated pngs corresponding with these slides.
-    Returns a list of PIL Image objects for these images sorted as they
-    where in the dvi
-    """
-    result = dvi_file.replace(".dvi", ".svg")
-    if not os.path.exists(result):
-        commands = [
-            "dvisvgm",
-            dvi_file,
-            "-n",
-            "-v",
-            "0",
-            "-o",
-            result,
-            ">",
-            get_null()
-        ]
-        os.system(" ".join(commands))
-    return result