小编Moe*_*Moe的帖子

你能用 3d 形式呈现这个箭头吗？

import matplotlib.patches as patches
style="Simple,tail_width=0.5,head_width=4,head_length=8"
kw = dict(arrowstyle=style, color=b)
a3 = patches.FancyArrowPatch((0, 0), (99, 100),connectionstyle="arc3,rad=-0.3", **kw, lw=cfg._sections['styles'].get('arrows'))

我试过：

import matplotlib.patches as patches
style="Simple,tail_width=0.5,head_width=4,head_length=8"
kw = dict(arrowstyle=style, color=b)
a3 = patches.FancyArrowPatch((0, 0), (1, 1), (0.5, 1.5),connectionstyle="arc3,rad=-0.3", **kw, lw=cfg._sections['styles'].get('arrows'))

错误是：

    a3 = patches.FancyArrowPatch((0, 0), (1, 1), (0.5, 1.5),connectionstyle="arc3,rad=-0.3", **kw, lw=1)
  File "/home/linux/.local/lib/python3.6/site-packages/matplotlib/patches.py", line 4068, in __init__
    raise ValueError("either posA and posB, or path need to provided")
ValueError: either posA and posB, or path need to provided

或者至少将箭头放在 3d 图中的一个点上？