Bug report

Bug summary

Adding a shadow to a patch as described in the documentation does nothing. From the documentation it appears as if matplotlib.patches.Shadow accepts a patch object. I am also not clear on the units of the required ox and oy properties.

Code for reproduction

import matplotlib.pyplot as plt
import matplotlib.patches as mpatches

fig, ax = plt.subplots(1, 1, figsize=(5, 5))

rectangle = mpatches.Rectangle(
    xy=(0.25, 0.25),
    width=1/2,
    height=1/2)

shadow = mpatches.Shadow(
    rectangle,
    ox=0.5,
    oy=0.5)

ax.add_patch(rectangle)
ax.add_patch(shadow)

Actual outcome

Expected outcome

A shadow of the blue rectangle patch nearby.

Matplotlib version

• Operating system: Manjaro 17.0.5
• Matplotlib version: (2.0.2)
• Matplotlib backend: module://ipykernel.pylab.backend_inline
• Python version: 3.6.2

I installed matplotlib via the Arch package repositories at sudo pacman -S python-matplotlib.

Edit: added a missing import to make the example self-sufficient. (afvincent)