Starting eoc/exp_footnote video

eoc/exp_footnote.py

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+from helpers import *
+
+from mobject.tex_mobject import TexMobject
+from mobject import Mobject
+from mobject.image_mobject import ImageMobject
+from mobject.vectorized_mobject import *
+
+from animation.animation import Animation
+from animation.transform import *
+from animation.simple_animations import *
+from animation.playground import *
+from topics.geometry import *
+from topics.characters import *
+from topics.functions import *
+from topics.fractals import *
+from topics.number_line import *
+from topics.combinatorics import *
+from topics.numerals import *
+from topics.three_dimensions import *
+from topics.objects import *
+from scene import Scene
+from scene.zoomed_scene import ZoomedScene
+from scene.reconfigurable_scene import ReconfigurableScene
+from camera import Camera
+from mobject.svg_mobject import *
+from mobject.tex_mobject import *
+
+from eoc.chapter1 import OpeningQuote, PatreonThanks
+from eoc.graph_scene import *
+
+class LastVideo(TeacherStudentsScene):
+    def construct(self):
+        series = VideoSeries()
+        series.to_edge(UP)
+        last_video = series[2]
+        next_video = series[3]
+        last_video_color = last_video[0].get_fill_color()
+        early_videos = VGroup(*series[:3])
+        later_videos = VGroup(*series[3:])
+        this_video = VideoIcon().scale(0.5)
+        this_video.move_to(VGroup(last_video, next_video), DOWN)
+
+        known_formulas = VGroup(*map(TexMobject, [
+            "\\frac{d(x^n)}{dx} = nx^{n-1}",
+            "\\frac{d(\\sin(x))}{dx} = \\cos(x)",
+        ]))
+        known_formulas.arrange_submobjects(
+            DOWN, buff = MED_LARGE_BUFF,
+        )
+        known_formulas.scale_to_fit_height(2.5)
+        exp_question = TexMobject("2^x, 7^x, e^x ???")
+
+        last_video_brace = Brace(last_video)
+        known_formulas.next_to(last_video_brace, DOWN)
+        last_video_brace.save_state()
+        last_video_brace.shift(3*LEFT)
+        last_video_brace.set_fill(opacity = 0)
+
+        self.add(series)
+        self.play(
+            last_video_brace.restore,
+            last_video.highlight, YELLOW,
+            self.get_teacher().change_mode, "raise_right_hand",
+        )
+        self.play(Write(known_formulas))
+        self.dither()
+        self.student_says(
+            exp_question, student_index = -1,
+            added_anims = [self.get_teacher().change_mode, "pondering"]
+        )
+        self.dither(2)
+        self.play(known_formulas.replace, last_video)
+        last_video.add(known_formulas)
+        this_video_copy = this_video.copy()
+        self.play(
+            early_videos.stretch_to_fit_width,
+            early_videos.get_width() - this_video_copy.get_width(),
+            early_videos.next_to, this_video_copy, LEFT, SMALL_BUFF, DOWN,
+            later_videos.stretch_to_fit_width,
+            later_videos.get_width() - this_video_copy.get_width(),
+            later_videos.next_to, this_video_copy, RIGHT, SMALL_BUFF, DOWN,
+            last_video_brace.stretch_to_fit_width, 
+            this_video_copy.get_width(),
+            last_video_brace.next_to, this_video_copy, DOWN, SMALL_BUFF,
+            GrowFromCenter(this_video)
+        )
+        self.play(
+            last_video.highlight, last_video_color,
+            this_video.highlight, YELLOW
+        )
+        self.play(
+            FadeOut(self.get_students()[-1].bubble),            
+            exp_question.next_to, last_video_brace, DOWN,
+            *[
+                ApplyMethod(pi.change_mode, "pondering")
+                for pi in self.get_students()
+            ]
+        )
+        self.dither(3)
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