Added missing mplot3d/offset_demo.py example

Author: WeatherGod

examples/mplot3d/offset_demo.py

@@ -0,0 +1,26 @@
+from mpl_toolkits.mplot3d import Axes3D
+import matplotlib.pyplot as plt
+import numpy as np
+
+# This example demonstrates mplot3d's offset text display.
+# As one rotates the 3D figure, the offsets should remain oriented
+# same way as the axis label, and should also be located "away"
+# from the center of the plot.
+#
+# This demo triggers the display of the offset text for the x and
+# y axis by adding 1e5 to X and Y. Anything less would not
+# automatically trigger it.
+
+fig = plt.figure()
+ax = fig.gca(projection='3d')
+X, Y = np.mgrid[0:6*np.pi:0.25, 0:4*np.pi:0.25]
+Z = np.sqrt(np.abs(np.cos(X) + np.cos(Y)))
+
+surf = ax.plot_surface(X + 1e5, Y + 1e5, Z, cmap='autumn', cstride=2, rstride=2)
+ax.set_xlabel("X-Label")
+ax.set_ylabel("Y-Label")
+ax.set_zlabel("Z-Label")
+ax.set_zlim(0, 2)
+
+plt.show()
+