Animations - HTML5

We can use html5 for animation, as suggested in this web page:

This seems to be the modern way to do animation in Python.

First step is to initialize some things in Python.

  • we need %matplotlib inline to get things to plot right on the notebook

  • we need numpy for the math

  • se need matplotlib for plotting

  • we need animation from matplotlib, and HTML from iPython.display to show the animations

We get all these with the following imports:

%matplotlib inline
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import animation, rc
from IPython.display import HTML

We now have four steps to get an animated plot

  • set up the figure frame

  • define the initializing function

  • define the function that draws each frame of the animation

  • call the animator function, which creates all the frames and saves them for you

Then we are ready to call "HTML" to display the animation.

# First set up the figure, the axis, and the plot element we want to animate
fig, ax = plt.subplots()

ax.set_xlim(( 0, 2))
ax.set_ylim((-2, 2))

line, = ax.plot([], [], lw=2)
# initialization function: plot the background of each frame
def init():
line.set_data([], [])
return (line,)
# animation function. This is called sequentially
def animate(i):
x = np.linspace(0, 2, 1000)
y = np.sin(2 * np.pi * (x - 0.01 * i))
line.set_data(x, y)
return (line,)
# call the animator. blit=True means only re-draw the parts that have changed.
anim = animation.FuncAnimation(fig, animate, init_func=init,
frames=100, interval=20, blit=True)

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Anytime you need the animation, you can call it up at will, with the following code:

# equivalent to rcParams['animation.html'] = 'html5'
rc('animation', html='html5')

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