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<h1>animation example code: rain.py<a class="headerlink" href="#animation-example-code-rain-py" title="Permalink to this headline">¶</a></h1>

[<a class="reference external" href="rain.py">source code</a>]

<div class="highlight-default"><div class="highlight"><pre>"""

===============

Rain simulation

===============

Simulates rain drops on a surface by animating the scale and opacity

of 50 scatter points.

Author: Nicolas P. Rougier

"""

import numpy as np

import matplotlib.pyplot as plt

from matplotlib.animation import FuncAnimation

# Create new Figure and an Axes which fills it.

fig = plt.figure(figsize=(7, 7))

ax = fig.add_axes([0, 0, 1, 1], frameon=False)

ax.set_xlim(0, 1), ax.set_xticks([])

ax.set_ylim(0, 1), ax.set_yticks([])

# Create rain data

n_drops = 50

rain_drops = np.zeros(n_drops, dtype=[('position', float, 2),

('size', float, 1),

('growth', float, 1),

('color', float, 4)])

# Initialize the raindrops in random positions and with

# random growth rates.

rain_drops['position'] = np.random.uniform(0, 1, (n_drops, 2))

rain_drops['growth'] = np.random.uniform(50, 200, n_drops)

# Construct the scatter which we will update during animation

# as the raindrops develop.

scat = ax.scatter(rain_drops['position'][:, 0], rain_drops['position'][:, 1],

s=rain_drops['size'], lw=0.5, edgecolors=rain_drops['color'],

facecolors='none')

def update(frame_number):

# Get an index which we can use to re-spawn the oldest raindrop.

current_index = frame_number % n_drops

# Make all colors more transparent as time progresses.

rain_drops['color'][:, 3] = np.clip(rain_drops['color'][:, 3], 0, 1)

# Make all circles bigger.

rain_drops['size'] += rain_drops['growth']

# Pick a new position for oldest rain drop, resetting its size,

# color and growth factor.

rain_drops['position'][current_index] = np.random.uniform(0, 1, 2)

rain_drops['size'][current_index] = 5

rain_drops['color'][current_index] = (0, 0, 0, 1)

rain_drops['growth'][current_index] = np.random.uniform(50, 200)

# Update the scatter collection, with the new colors, sizes and positions.

scat.set_edgecolors(rain_drops['color'])

scat.set_sizes(rain_drops['size'])

scat.set_offsets(rain_drops['position'])

# Construct the animation, using the update function as the animation

# director.

animation = FuncAnimation(fig, update, interval=10)

plt.show()

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