Matplotlib:旋转补丁 [英] Matplotlib: rotating a patch

问题描述

我想在matplotlib中旋转一个Rectangle，但是当我应用转换时，该矩形不再显示:

I wanted to rotate a Rectangle in matplotlib but when I apply the transformation, the rectangle doesn't show anymore:

rect = mpl.patches.Rectangle((0.0120,0),0.1,1000)
t = mpl.transforms.Affine2D().rotate_deg(45)
rect.set_transform(t)

这是已知错误还是我犯错了?

is this a known bug or do I make a mistake?

推荐答案

显然，面片上的变换是几个变换的合成，用于处理缩放和边界框.将转换添加到现有的绘图转换中似乎可以提供更多您所期望的东西.尽管看起来还有一些补偿需要解决.

Apparently the transforms on patches are composites of several transforms for dealing with scaling and the bounding box. Adding the transform to the existing plot transform seems to give something more like what you'd expect. Though it looks like there's still an offset to work out.

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.patches as patches
import matplotlib as mpl
fig = plt.figure()
ax = fig.add_subplot(111)

rect = patches.Rectangle((0.0120,0),0.1,1000)

t_start = ax.transData
t = mpl.transforms.Affine2D().rotate_deg(-45)
t_end = t_start + t

rect.set_transform(t_end)

print repr(t_start)
print repr(t_end)
ax.add_patch(rect)

plt.show()

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