Fix legend yerr #40777
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Fix legend yerr #40777
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MarcoGorelli force-pushed the fix-legend-yerr branch from d16bc69 to 91e592a Compare 
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| is #39522 closed? (or partial) |
jreback reviewed Apr 5, 2021
| @@ -0,0 +1,45 @@ | |||
| import pytest | |||
| | |||
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can you move other legend tests here? (if we have them)
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either way |
Member Author
| OK, have moved those tests over in this pr @jreback |
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| thanks @MarcoGorelli very nice! |
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secondary_yand then plotting another line results in wrong color for (right) line #40044I spent several hours on this, and I don't think there's a simple solution at the moment (though I'd love to be proved wrong!)
Background:
in Nov 2017, #18222 was opened, in which it was noted that marker info isn't preserved in legends. This is because we were getting legend handles using
leg.legendHandles:pandas/pandas/plotting/_matplotlib/core.py
Line 574 in b623a9d
Due to an open issue in matplotlib,
leg.legendHandlesdoesn't preserve marker info. So, in #27808, the code was updated to useax.get_legend_handles_labels:pandas/pandas/plotting/_matplotlib/core.py
Line 604 in 5d3b492
This preserves marker info but has the problem that it may contain additional objects which aren't visible in the legend. The result of this is the permutations observed in #39522 .
I think that having wrong colours in the legend, as in #39522 and #40044, is far worse than the legend not preserving marker info. Solving everything together doesn't currently seem doable, at least not until matplotlib/matplotlib#11357 is solved in matplotlib.
So my suggestion is to revert some of the changes in #27808, so that at least the colors are right, and when the matplotlib issue is addressed, then the marker info can be preserved.
#39522 on master:
on this branch:
#40044 on master:
on this branch: