matplotlib - 更改 matplotlib quiver 函数的箭头样式

Question

有没有办法改变matplotlib quiver function的箭头样式?

我尝试通过 arrowprops=dict() kwarg 到函数，但这似乎只适用于 annotate function .

无论如何，我正在寻找的箭头样式似乎没有包含在 matplotlib 中。我认为它们被称为“半箭”。我可以使用 UTF-8 字符插入这些箭头，但是无法自定义这些箭头，并且很难将它们正确对齐。有没有更好的方法来做到这一点(也许插入一个 SVG 符号)？



我上面的解决方案的代码:

import matplotlib.pyplot as plt
import numpy as np
import mplstereonet
import matplotlib.image as image

#UTF-8 characters don't seem to work in the normal pyplot backend
plt.switch_backend("gtk3cairo")

fig = plt.figure()
ax = fig.add_subplot(111, projection='stereonet')

arrows = [[120, 30, 120, 30, "sin"],
          [160, 50, 160, 50, "dex"]]

for arrow in arrows:
    strike = arrow[0] - 90
    ax.plane(strike, arrow[1], color="#000000")
    ax.line(arrow[3], arrow[2], color="#ff0000")

    x, y = mplstereonet.line(arrow[3], arrow[2])
    ang = np.degrees(np.arctan2(x, y))[0] * (-1)
    gap = 0.08
    gap_x = gap * np.sin(ang)
    gap_y = gap * np.cos(ang)

    if arrow[4] == "dex":
        ax.text(x - gap_x, y - gap_y, "⇀", size=30, rotation=ang,
                horizontalalignment="center", verticalalignment="center")
        ax.text(x + gap_x, y + gap_y, "↽", size=30, rotation=ang,
                horizontalalignment="center", verticalalignment="center")

    elif arrow[4] == "sin":
        ax.text(x - gap_x, y - gap_y, "↼", size=30, rotation=ang,
                horizontalalignment="center", verticalalignment="center")
        ax.text(x + gap_x, y + gap_y, "⇁", size=30, rotation=ang,
                horizontalalignment="center", verticalalignment="center")

plt.show()

类似问题:

How to use custom marker with plot?

Matplotlib custom marker/symbol

Answer 1

注:这只是部分答案，关于 arrowprops=dict() 的使用.

Part of the problem as that there are 7 (!) artists that can be used to draw arrows (Arrow, FancyArrow, FancyArrowPatch, ConnectionPatch, YAArrow, SimpleArrow (which is a sub-class of FancyArrowPatch) and FilledArrow) all of which behave differently and have different interfaces.

This does not include quiver which does draw arrows, but is a PolyCollection sub-class.

您可以阅读有关此箭头讨论的更多信息 here .
还提到一些函数会根据给定的参数自动更改箭头样式:

[...] the issue with the annotate function is that it's not obvious to a user that the API changes when specifying a different arrowstyle.

我遇到了类似的问题 annotate ，您可能会看到 in this question .