Add example that creates writer class and passes it for saving.

Author: dopplershift

examples/animation/basic_example_writer.py

@@ -0,0 +1,41 @@
+# Same as basic_example, but writes files using a single MovieWriter instance
+# without putting on screen
+import numpy as np
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+import matplotlib.animation as animation
+
+def update_line(num, data, line):
+    line.set_data(data[...,:num])
+    return line,
+
+# Set up formatting for the movie files
+Writer = animation.writers['ffmpeg']
+writer = Writer(fps=15, metadata=dict(artist='Me'), bitrate=1800)
+
+
+fig1 = plt.figure()
+
+data = np.random.rand(2, 25)
+l, = plt.plot([], [], 'r-')
+plt.xlim(0, 1)
+plt.ylim(0, 1)
+plt.xlabel('x')
+plt.title('test')
+line_ani = animation.FuncAnimation(fig1, update_line, 25, fargs=(data, l),
+    interval=50, blit=True)
+line_ani.save('lines.mp4', writer=writer)
+
+fig2 = plt.figure()
+
+x = np.arange(-9, 10)
+y = np.arange(-9, 10).reshape(-1, 1)
+base = np.hypot(x, y)
+ims = []
+for add in np.arange(15):
+    ims.append((plt.pcolor(x, y, base + add, norm=plt.Normalize(0, 30)),))
+
+im_ani = animation.ArtistAnimation(fig2, ims, interval=50, repeat_delay=3000,
+    blit=True)
+im_ani.save('im.mp4', writer=writer)