问题
How does one make a legend for patch patterns used on a graph or add information on the patch patterns to a preexisting legend without affecting information already present on the legend?
回答1:
When you create the patch include the kwarg label , ex
## bunch of code
ax.add_patch(mpl.patches.Rectangle(...,label='fail'))
## bunch of code
ax.plot(...,label='some line')
## bunch of code
ax.legend()
and it will be automaigically added to your legend. And entry will be added for each artist that you have added a label to.
If you make your legend via legend(hands,labs), just add the patch object to the hands list as you would a Line2D object. legend really works on artists which both patch and Line2D are derived from.
来源：https://stackoverflow.com/questions/14128987/how-to-make-a-legend-of-matplotlib-patch-patterns-or-add-them-to-a-preexisting-l