Merge pull request #200 from 3b1b/patreon-animation

Fixed Pi Creature color bug

active_projects/name_animation.py

@@ -0,0 +1,75 @@
+from big_ol_pile_of_manim_imports import *
+
+NAME_WITH_SPACES = "Prime Meridian"
+DIAMETER = 3.0
+RADIUS = DIAMETER / 2
+LETTER_SCALE = 1
+
+class NameAnimationScene(Scene):
+
+    def construct(self):
+
+        name = ''.join(NAME_WITH_SPACES.split(' '))
+        letters = list(name)
+        nb_letters = len(letters)
+        randy = PiCreature()
+        randy.move_to(ORIGIN).scale_to_fit_height(0.5 * DIAMETER)
+        randy.set_color(BLUE_E)
+        randy.look_at(UP + RIGHT)
+        self.add(randy)
+        dtheta = TAU/nb_letters
+        angles = np.arange(TAU/4,-3 * TAU / 4,-dtheta)
+        name_mob = VGroup()
+        for (letter, angle) in zip(letters, angles):
+            letter_mob = TextMobject(letter).scale(LETTER_SCALE)
+            pos = RADIUS * np.cos(angle) * RIGHT + RADIUS * np.sin(angle) * UP
+            letter_mob.move_to(pos)
+            name_mob.add(letter_mob)
+
+        pos2 = RADIUS * np.cos(angles[2]) * RIGHT + RADIUS * np.sin(angles[2]) * UP
+
+        self.play(
+            LaggedStart(Write, name_mob, run_time = 3),
+            ApplyMethod(randy.look_at, pos2, run_time = 3)
+        )
+
+        for i in range(2,nb_letters + 2):
+
+            group = []
+
+            for (j,letter_mob) in enumerate(name_mob.submobjects):
+
+                new_angle = TAU / 4 - i * j * dtheta
+                new_pos = RADIUS * np.cos(new_angle) * RIGHT + RADIUS * np.sin(new_angle) * UP
+                letter_mob.target = letter_mob.copy().move_to(new_pos)
+                anim = MoveToTarget(letter_mob, path_arc = - j * dtheta)
+                group.append(anim)
+
+            self.play(
+                AnimationGroup(*group, run_time = 3),
+                ApplyMethod(randy.look_at,name_mob.submobjects[2], run_time = 3)
+            )
+            self.wait(0.5)
+
+
+        thank_you = TextMobject("Thank You!").next_to(randy, DOWN)
+        new_randy = randy.copy()
+        new_randy.change("hooray")
+        new_randy.set_color(BLUE_E)
+        new_randy.look_at(ORIGIN)
+        self.play(
+            Transform(name_mob, thank_you),
+            Transform(randy, new_randy)
+        )
+
+
+
+
+
+
+
+
+
+
+
+

for_3b1b_videos/pi_creature.py

@@ -98,14 +98,15 @@ class PiCreature(SVGMobject):
 
     def set_color(self, color):
         self.body.set_fill(color)
+        self.color = color
         return self
 
     def change_mode(self, mode):
         new_self = self.__class__(
-            mode=mode,
-            color=self.color
+            mode = mode,
         )
-        new_self.scale_to_fit_height(self.get_height())
+        new_self.match_style(self)
+        new_self.match_height(self)
         if self.is_flipped() ^ new_self.is_flipped():
             new_self.flip()
         new_self.shift(self.eyes.get_center() - new_self.eyes.get_center())

template.tex

@@ -11,7 +11,7 @@
 \usepackage{mathrsfs}
 \usepackage{calligra}
 \usepackage{wasysym}
-\usepackage[UTF8]{ctex}
+%\usepackage[UTF8]{ctex}
 
 \begin{document}
 \centering

text_template.tex

@@ -15,7 +15,7 @@
 \usepackage{ragged2e}
 \usepackage{physics}
 \usepackage{xcolor}
-\usepackage[UTF8]{ctex}
+%\usepackage[UTF8]{ctex}
 \linespread{1}
 
 \begin{document}