3b1b-manim/docs/example.py

from manimlib import *

class SquareToCircle(Scene):
    def construct(self):
        circle = Circle()
        circle.set_fill(BLUE, opacity=0.5)
        circle.set_stroke(BLUE_E, width=4)
        square = Square()

        self.play(ShowCreation(square))
        self.wait()
        self.play(ReplacementTransform(square, circle))
        self.wait()
        # Try typing the following lines
        # self.play(circle.animate.stretch(4, dim=0))
        # self.play(Rotate(circle, TAU / 4))
        # self.play(circle.animate.shift(2 * RIGHT), circle.animate.scale(0.25))
        # circle.insert_n_curves(10)
        # self.play(circle.animate.apply_complex_function(lambda z: z**2))

class SquareToCircleEmbed(Scene):
    def construct(self):
        circle = Circle()
        circle.set_fill(BLUE, opacity=0.5)
        circle.set_stroke(BLUE_E, width=4)

        self.add(circle)
        self.wait()
        self.play(circle.animate.stretch(4, dim=0))
        self.wait(1.5)
        self.play(Rotate(circle, TAU / 4))
        self.wait(1.5)
        self.play(circle.animate.shift(2 * RIGHT), circle.animate.scale(0.25))
        self.wait(1.5)
        circle.insert_n_curves(10)
        self.play(circle.animate.apply_complex_function(lambda z: z**2))
        self.wait(2)