Reputation: 4548
I need to add a semi transparent skin over my matplotlib figure. I was thinking about adding a rectangle to the figure with alpha <1 and a zorder high enough so its drawn on top of everything.
I was thinking about something like that
figure.add_patch(Rectangle((0,0),1,1, alpha=0.5, zorder=1000))
But I guess rectangles are handled by Axes only. is there any turn around ?
Upvotes: 28
Views: 20948
Reputation: 14498
If you aren't using subplots, using gca()
will work easily.
from matplotlib.patches import Rectangle
fig = plt.figure(figsize=(12,8))
plt.plot([0,100],[0,100])
plt.gca().add_patch(Rectangle((25,50),15,15,fill=True, color='g', alpha=0.5, zorder=100, figure=fig))
Upvotes: 3
Reputation: 3573
Late answer for others who google this.
There actually is a simple way, without phantom axes, close to your original wish. The Figure
object has a patches
attribute, to which you can add the rectangle:
fig, ax = plt.subplots(nrows=1, ncols=1)
ax.plot(np.cumsum(np.random.randn(100)))
fig.patches.extend([plt.Rectangle((0.25,0.5),0.25,0.25,
fill=True, color='g', alpha=0.5, zorder=1000,
transform=fig.transFigure, figure=fig)])
Gives the following picture (I'm using a non-default theme):
The transform
argument makes it use figure-level coordinates, which I think is what you want.
Upvotes: 40
Reputation: 17485
You can use a phantom axes on top of your figure and change the patch to look as you like, try this example:
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_axes([0,0,1,1])
ax.xaxis.set_visible(False)
ax.yaxis.set_visible(False)
ax.set_zorder(1000)
ax.patch.set_alpha(0.5)
ax.patch.set_color('r')
ax2 = fig.add_subplot(111)
ax2.plot(range(10), range(10))
plt.show()
Upvotes: 9