matplotlib.patches.FancyArrow已使尾部变稀疏 [英] matplotlib.patches.FancyArrow has thinned out tail

问题描述

执行此代码时:

plt.figure(figsize=(3,3))
plt.xlim(-3, 3); plt.ylim(-3,3); 
plt.arrow(0,0, 2, 2, head_length=1.4, head_width=1.8, width=1.4,
   alpha=0.2, length_includes_head=True, fc='r')

我得到以下输出:

但是我不希望尾巴缩小.在我的另一台计算机上，我没有这个问题.有人知道怎么解决吗?

However I don't want the tail to be shrunk. On my other computer I don't have this problem. Does anybody know how to solve it?

我的 matplotlib 版本是 2.0.0.

My matplotlib version is 2.0.0.

推荐答案

这似乎是箭头中的某种错误.您会期望有一个 tail_width 参数，该参数设置箭头(或其箭头的尾部)的宽度.但是，这不存在.

This seems to be some kind of bug in the arrow. You would expect there to be a tail_width argument which sets the width of the arrow (or its tail). This however does not exist.

作为一种解决方法，您可以使用需要手动添加到轴的 FancyArrowPatch . FancyArrowPatch 具有参数 arrowstyle ，您可以向其提供参数字符串.在此字符串中，可以正确识别"tail_width" .

As a workaround, you may use a FancyArrowPatch which you need to manually add to the axes. The FancyArrowPatch has an argument arrowstyle to which you can supply a string of arguments. Within this string "tail_width" is correctly recognized.

import matplotlib.pyplot as plt
import matplotlib.patches as patches

plt.figure(figsize=(3,3))
plt.xlim(-3, 3); plt.ylim(-3,3);

style="Simple,head_length=28,head_width=36,tail_width=20"
plt.gca().add_patch(
        patches.FancyArrowPatch((0,0), (2,2),arrowstyle=style,alpha=0.2,fc='r' ))

plt.show()

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