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Hatching doesn't respect alpha #7992
Description
Bug report
Bug summary
When plotting using a hatch, alpha is not applied to the hatching
Code for reproduction
import matplotlib.pyplot as plt
plt.fill_between(range(10), [10]*10, hatch='/', alpha=0.5)
plt.show()Actual outcome
Hatching is black with no alpha
Expected outcome
Before matplotlib 2.0, the hatching was the color of the fill and alpha was respected
Matplotlib version
Windows 7
matplotlib 2.0.0
numpy 1.12.0
scipy 0.18.1
Installation through pip
Activity
dstansby commentedon Jan 30, 2017
It looks like this will be fixed by #7976, in the case where the
edgecolorargument is specified tofill_betweento choose the colour of the hatch.japborst commentedon Jan 30, 2017
Nice! Thanks for the quick update :)
dstansby commentedon Feb 20, 2017
This is now fixed in master and 2.0.1
kilojoules commentedon Jun 25, 2017
Is there no way to control the hatch transparency separately?
tacaswell commentedon Jun 25, 2017
At the lowest level it can be controlled, but currently there is no user interface to this in the classes we ship. If you need a different color hatch + edge, I suggest using two over-lapping artists.
tacaswell commentedon Apr 29, 2018
@usiu5555 See the last example of https://matplotlib.org/users/legend_guide.html#legend-handlers that section for how to handle merging multiple artists into a single legend entry.
There has not bee any progress on threading the alpha control of the hatch through the Artist classes, would you be interested in looking into that @usiu5555 ?