使用mpatches.Patch获得自定义图例 [英] using mpatches.Patch for a custom legend

问题描述

我正在使用以下代码创建自定义的matplotlib图例.

I'm using the following code to create a custom matplotlib legend.

import matplotlib.patches as mpatches
import matplotlib.pyplot as plt
colors = ["g", "w"]
texts = ["Green Data Description", "RedData Description"]
patches = [ mpatches.Patch(color=colors[i], label="{:s}".format(texts[i]) ) for i in range(len(texts)) ]
plt.legend(handles=patches, bbox_to_anchor=(0.5, 0.5), loc='center', ncol=2 )

结果图例如下:

1-图例中的白色符号未显示，因为默认图例背景也为白色.如何将图例背景设置为其他颜色?

1 - The white symbol in the legend is not shown because that the default legend background is white as well. How can I set the legend background to other color ?

2-如何将图例中的矩形符号更改为圆形?

2 - How to change the rectangular symbols in the legend into circular shape ?

推荐答案

1. 可以使用

2. 要获取圆形图例手柄，您可以使用带有圆形标记的标准绘图作为代理艺术家

3. To obtain a circular shaped legend handle, you may use a standard plot with a circular marker as proxy artist,

   plt.plot([],[], marker="o", ms=10, ls="")
   

完整示例:

import matplotlib.patches as mpatches
import matplotlib.pyplot as plt
colors = ["g", "w"]
texts = ["Green Data Description", "RedData Description"]
patches = [ plt.plot([],[], marker="o", ms=10, ls="", mec=None, color=colors[i], 
            label="{:s}".format(texts[i]) )[0]  for i in range(len(texts)) ]
plt.legend(handles=patches, bbox_to_anchor=(0.5, 0.5), 
           loc='center', ncol=2, facecolor="plum", numpoints=1 )

plt.show()

(请注意，只有较旧版本的matplotlib才需要mec和numpoints自变量)

(Note that mec and numpoints arguments are only required for older versions of matplotlib)

有关图例中更复杂的形状，可以使用自定义处理程序映射，请参见图例指南或例如此答案作为示例

For more complicated shapes in the legend, you may use a custom handler map, see the legend guide or e.g. this answer as an example

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