manim-express 0.3.1

Animation engine for explanatory math videos

Install

pip install manim_express

The above steps will automatically install packages manim_express and manimlib(my fork version) for you. Then you can code with them anywhere.

Quick start

• Render an animation: 3b1b:SquareToCircle

  from manimlib import *
  from manim_express import EagerModeScene
  
  scene = EagerModeScene()
  circle = Circle()
  circle.set_fill(BLUE, opacity=0.5)
  circle.set_stroke(BLUE_E, width=4)
  
  square = Square()
  scene.play(ShowCreation(square))
  scene.play(ReplacementTransform(square, circle))
  
  scene.hold_on()
  

  Operating graphics:

  • hold down the d key on the keyboard and move the mouse to change the three-dimensional perspective.
  • hold down the s key on the keyboard and move the mouse to pan the screen
  • hold down the z on the keyboard while scrolling the middle mouse button to zoom the screen
  • scroll the middle mouse button to move the screen up and down
  • reset camera view by pressing r
  • close the window and exit the program by pressing q

• manim_express vs Matplotlib:
  In some cases, you may need to install LaTeX to render tex fonts.
  Fortunately, online latex compilation option is available. Just set SceneArgs.use_online_tex=True

  from manimlib import *
  from manim_express import *
  import numpy as np
  SceneArgs.use_online_tex = True # Use online latex compiler
  
  theta = np.linspace(0, 2*np.pi, 200)
  x = np.cos(theta)
  y = np.sin(theta)
  
  # matplotlib
  # import matplotlib.pyplot as plt
  # plt.plot(x, y, color='green', linewidth=2)
  # plt.axis("equal")
  # plt.show()
  
  # manim_express
  scene = EagerModeScene()
  scene.plot(x, y, color=GREEN, width=2, scale_ratio=1)
  scene.show_plot()
  
  scene.hold_on()
  

Resources

• Wiki
  https://flyingframes.readthedocs.io/en/latest/index.html https://3b1b.github.io/manim/

  https://manim.wiki/
  https://manim.wiki/shaders/

• 3B1B videos:
  https://github.com/3b1b/videos

Examples

• GOA model