manim-gallery

class ChangeShape(Scene):

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class Surround(Scene):

File animations.py

from manimlib.imports import *


class ChangeShape(Scene):
    def construct(self):
        circle = Circle()
        square = Square()
        self.play(Transform(circle, square))
        self.wait(1)
        new_circle = Circle()
        self.play(Transform(circle, new_circle))
        self.wait(1)


class Surround(Scene):
    def construct(self):
        circle = Circle()
        square = Square()
        circle.surround(square)
        self.play(FadeIn(square))
        self.play(GrowFromCenter(circle))
        self.wait(1)

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Render this example

Install cairo, LaTeX and ffmpeg (LaTeX is optional) Install manimlib