如何为极坐标图 matplotlib 创建小刻度 [英] How to create minor ticks for polar plot matplotlib

问题描述

对于如下所示的 matplotlib 绘制的极坐标图，我对以下两件事感兴趣

I am interested in the following two things for the polar plot plotted by matplotlib shown below

1. 如何为 r 轴上的极坐标图创建小刻度?
2. 如何将r标签远离r刻度移动，如图所示，某些r刻度与轴接触.

推荐答案

极坐标图没有次要或主要的滴答声.因此，我认为您需要通过绘制小线段来手动创建小刻度线.

The polar plot does not have minor or major ticks. So I think you need to create the minor ticks manually by plotting small line segments.

例如:

import numpy as np
import matplotlib.pyplot as plt

r = np.arange(0, 2, 0.01)
theta = 2 * np.pi * r

ax = plt.subplot(111, projection='polar')
ax.plot(theta, r)
ax.set_rmax(2)
ax.margins(y=0)
ax.set_rticks([0.5, 1, 1.5, 2])  # less radial ticks
ax.set_rlabel_position(120)  # get radial labels away from plotted line

ax.grid(True)

tick = [ax.get_rmax(),ax.get_rmax()*0.97]
for t  in np.deg2rad(np.arange(0,360,5)):
    ax.plot([t,t], tick, lw=0.72, color="k")

ax.set_title("A line plot on a polar axis", va='bottom')
plt.show()

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