更新散点图的标记形状 [英] Update marker shape of a scatter plot

问题描述

散点图对象具有一种名为.set_color的方法来更新标记的颜色，并具有.set_offsets的方法来更新其位置，但是如何更新标记的形状?

解决方案

散点图返回路径集合，其中包含标记的路径.为了更改标记的形状，您需要将路径设置为新的标记路径.

对于

唯一的警告是您还需要设置标记大小，默认情况下，新标记的绘制会很大.

A scatter plot object has a method called .set_color to update the colors of the markers and .set_offsets to update their position but how can I update the marker shapes?

解决方案

A scatter plot returns a path collection, it contains the paths of the markers. In order to change the marker shape you need to set the path to the new marker path.

For built-in markers, these paths can be obtained from the MarkerStyle class. For custom markers see my SO answer here.

Example - scatter plot with dot markers later changed to plus markers:

from matplotlib import pyplot as plt
from matplotlib.markers import MarkerStyle

sp = plt.scatter([1,2],[1,2], marker='.')

new_marker = MarkerStyle("+")
sp.set_paths((new_marker.get_path(),))
sp.set_sizes([8])

plt.show()

The only caveat is that you need to set the marker size too, by default the new markers are plotted rather big.

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