PyPlot 将替代 y 轴移动到背景 [英] PyPlot move alternative y axis to background

问题描述

在 pyplot 中，您可以使用 zorder 选项或通过更改 plot() 命令的顺序来更改不同图形的顺序.但是，当您通过 ax2 = twinx() 添加替代轴时，新轴将始终覆盖旧轴(如 文档).

In pyplot, you can change the order of different graphs using the zorder option or by changing the order of the plot() commands. However, when you add an alternative axis via ax2 = twinx(), the new axis will always overlay the old axis (as described in the documentation).

是否可以更改轴的顺序以将替代(孪生)y 轴移动到背景?

Is it possible to change the order of the axis to move the alternative (twinned) y-axis to background?

在下面的例子中，我想在直方图的顶部显示蓝线:

In the example below, I would like to display the blue line on top of the histogram:

import numpy as np
import matplotlib.pyplot as plt
import random

# Data
x = np.arange(-3.0, 3.01, 0.1)
y = np.power(x,2)

y2 = 1/np.sqrt(2*np.pi) * np.exp(-y/2)
data = [random.gauss(0.0, 1.0) for i in range(1000)]

# Plot figure
fig = plt.figure()
ax1 = fig.add_subplot(111)
ax2 = ax1.twinx()

ax2.hist(data, bins=40, normed=True, color='g',zorder=0)
ax2.plot(x, y2, color='r', linewidth=2, zorder=2)
ax1.plot(x, y, color='b', linewidth=2, zorder=5)

ax1.set_ylabel("Parabola")
ax2.set_ylabel("Normal distribution")

ax1.yaxis.label.set_color('b')
ax2.yaxis.label.set_color('r')

plt.show()

由于某种原因，我无法上传此代码生成的图像.我稍后再试.

For some reason, I am unable to upload the image generated by this code. I will try again later.

推荐答案

您可以设置坐标轴的zorder，ax.set_zorder().然后需要删除该轴的背景，以便下面的轴仍然可见.

You can set the zorder of an axes, ax.set_zorder(). One would then need to remove the background of that axes, such that the axes below is still visible.

ax2 = ax1.twinx()
ax1.set_zorder(10)
ax1.patch.set_visible(False)

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