更改matplotlib箭头功能的箭头样式

2019年8月6日 471次阅读

有没有办法改变
matplotlib quiver function箭头的风格？

我尝试将arrowprops = dict()kwarg传递给函数,但这似乎只适用于annotate function.

在任何情况下,我正在寻找的箭头样式,似乎不包括在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,但是不能自定义箭头,并且很难使它们正确对齐.有没有更好的方法(可能插入SVG符号)？

《更改matplotlib箭头功能的箭头样式》

上面我的解决方案的代码：

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()

类似的问题：

> How to use custom marker with plot?
> Matplotlib custom marker/symbol

最佳答案 注意：这只是关于使用arrowprops = dict()的部分答案.

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.

您可以在此箭头讨论here上阅读更多内容.

还提到有些函数根据给出的参数自动改变箭头样式：

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

我有一个类似annotate的问题,你可能会看到in this question.

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