PyPlot将替代的y轴移至背景 [英] PyPlot move alternative y axis to background

问题描述

在pyplot中，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()添加备用轴时，新轴将始终覆盖旧轴(如

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)的y轴移至背景?

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

在下面的示例中，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，我无法上载此代码生成的图像.我待会再试.

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

推荐答案

您可以设置轴的zorder，ax.set_zorder().然后，需要删除该轴的背景，以使下面的轴仍然可见.

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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