matplotlib更改PatchCollection中的补丁

问题描述

PatchCollection接受Patch es的列表，并允许我一次将它们转换/添加到画布.但是在构建PatchCollection对象之后对Patch es之一的更改不会反映出来

PatchCollection accepts a list of Patches and allows me to transform / add them to a canvas all at once. But changes to the one of the Patches after the construction of the PatchCollection object are not reflected

例如:

import matplotlib.pyplot as plt
import matplotlib as mpl

rect = mpl.patches.Rectangle((0,0),1,1)

rect.set_xy((1,1))
collection = mpl.collections.PatchCollection([rect])
rect.set_xy((2,2))

ax = plt.figure(None).gca()
ax.set_xlim(0,5)
ax.set_ylim(0,5)
ax.add_artist(collection)
plt.show()  #shows a rectangle at (1,1), not (2,2)

我正在寻找一个matplotlib集合来将补丁分组，以便可以将它们一起转换，但是我也希望能够更改单个补丁.

I'm looking for a matplotlib collection that will group patches just so I can transform them together, but I want to be able to change the individual patches as well.

推荐答案

我不知道可以满足您需要的集合，但是您可以很轻松地为自己编写一个:

I don't know of a collection which will do what you want, but you could write one for yourself fairly easily:

import matplotlib.collections as mcollections

import matplotlib.pyplot as plt
import matplotlib as mpl


class UpdatablePatchCollection(mcollections.PatchCollection):
    def __init__(self, patches, *args, **kwargs):
        self.patches = patches
        mcollections.PatchCollection.__init__(self, patches, *args, **kwargs)

    def get_paths(self):
        self.set_paths(self.patches)
        return self._paths


rect = mpl.patches.Rectangle((0,0),1,1)

rect.set_xy((1,1))
collection = UpdatablePatchCollection([rect])
rect.set_xy((2,2))

ax = plt.figure(None).gca()
ax.set_xlim(0,5)
ax.set_ylim(0,5)
ax.add_artist(collection)
plt.show()  # now shows a rectangle at (2,2)

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