# Animations - HTML5

We can use html5 for animation, as suggested in this web page: <http://louistiao.me/posts/notebooks/embedding-matplotlib-animations-in-jupyter-notebooks/>

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:

```python
%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.

```python
# 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)
# NOTE: THIS WILL DISPLAY JUST AN EMPTY BOX.
```

![An empty plot](https://github.com/callysto/training-manual/tree/92857076adbe65cc43e9205c3cad43b9ece28448/assets/Plot0.png)

```python
# initialization function: plot the background of each frame
def init():
line.set_data([], [])
return (line,)
```

```python
# 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,)
```

```python
# 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)
```

```python
HTML(anim.to_html5_video())
```

&#x20;Your browser does not support the video tag.

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

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