Draw small grid lines below the major grid lines
I am trying to draw a grid using matplotlib. The grid probe should be behind all other lines in the graph. My problem so far is that small grid lines are always drawn in front of the main grid lines, i.e.
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.ticker import MultipleLocator, FormatStrFormatter
plt.rc('text', usetex=True)
plt.rc('font', family='serif')
f = plt.figure(figsize=(4,4))
ax = f.add_subplot(111)
ax.xaxis.set_minor_locator(MultipleLocator(1))
ax.xaxis.set_major_locator(MultipleLocator(10))
ax.yaxis.set_minor_locator(MultipleLocator(1))
ax.yaxis.set_major_locator(MultipleLocator(10))
majc ="#3182bd"
minc ="#deebf7"
ax.xaxis.grid(True,'minor',color=minc, ls='-', lw=0.2)
ax.yaxis.grid(True,'minor',color=minc, ls='-', lw=0.2)
ax.xaxis.grid(True,'major',color=majc, ls='-')
ax.yaxis.grid(True,'major',color=majc,ls ='-')
ax.set_axisbelow(True)
x = np.linspace(0, 30, 100)
ax.plot(x, x, 'r-', lw=0.7)
[line.set_zorder(3) for line in ax.lines]
plt.savefig('test.pdf')
Any suggestions? Thank.
EDIT: close-up example
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1 answer
More specifically, it looks like it draws vertical majors, vertical minors, horizontal majors, horizontal minors, and plotted lines in that order. Probably pretty deep in matplotlib basics.
For the colors you are using, you can get by by highlighting major and minor alpha, not RGB. Changing two lines of your example:
ax.xaxis.grid(True,'minor',color=majc, alpha=0.2, ls='-', lw=0.2)
ax.yaxis.grid(True,'minor',color=majc, alpha=0.2, ls='-', lw=0.2)
result:
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