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How to place customized legend symbols on a plot using Matplotlib?
To plot customized legend symbols on a plot, we can take the following steps −
- Set the figure size and adjust the padding between and around the subplots.
- Inherit HandlerPatch class, override create artists method, add an elliptical patch to the plot, and return the patch handler.
- Plot a circle on the plot using Circle class.
- Add a circle patch on the current axis.
- Use legend() method to place the legend on the plot.
- To display the figure, use show() method.
Example
import matplotlib.pyplot as plt, matplotlib.patches as mpatches
from matplotlib.legend_handler import HandlerPatch
plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True
class HandlerEllipse(HandlerPatch):
def create_artists(self, legend, orig_handle, xdescent, ydescent, width, height, fontsize, trans):
center = 0.5 * width - 0.5 * xdescent, 0.5 * height - 0.5 * ydescent
p = mpatches.Ellipse(xy=center, width=width + xdescent, height=height + ydescent)
self.update_prop(p, orig_handle, legend)
p.set_transform(trans)
return [p]
c = mpatches.Circle((0.5, 0.5), 0.25, facecolor="green", edgecolor="red", linewidth=1)
plt.gca().add_patch(c)
plt.legend([c], ["An ellipse,Customized legend element"],
handler_map={mpatches.Circle: HandlerEllipse()})
plt.show()Output
Updated on: 05-Jun-2021
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