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==============
Frame grabbing
==============
Use a MovieWriter directly to grab individual frames and write them to a
file. This avoids any event loop integration, and thus works even with the Agg
backend. This is not recommended for use in an interactive setting.
Output generated via `matplotlib.animation.Animation.to_jshtml`.
"""
import numpy as np
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
from matplotlib.animation import FFMpegWriter
# Fixing random state for reproducibility
np.random.seed(19680801)
metadata = dict(title='Movie Test', artist='Matplotlib',
comment='Movie support!')
writer = FFMpegWriter(fps=15, metadata=metadata)
fig = plt.figure()
l, = plt.plot([], [], 'k-o')
plt.xlim(-5, 5)
plt.ylim(-5, 5)
x0, y0 = 0, 0
with writer.saving(fig, "writer_test.mp4", 100):
for i in range(100):
x0 += 0.1 * np.random.randn()
y0 += 0.1 * np.random.randn()
l.set_data(x0, y0)
writer.grab_frame()
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