zorder with twinx grid

Hi,

Does the zorder work between twin axis? I can't get lines on the first axis to be on top of the second grid:

plot([20,30], [0, 5], color="red", lw=5, zorder=10)
ax2=twinx()
grid(ls="-", lw=5, zorder=-1)
ax2.set_axisbelow(True)
title("Why doesn't the read line go above the second axis?")

Cheers,
Olle

twinx makes a separate axes and zorders are only meaningful within a same axes.
Because ax2 is added to the figure later than the original axes,
artists in ax2 are always above others.

I don't think there is an easy way to make zorder work between several
axes, unless you somehow merge them into a single axes. You may try my
(a bit experimental) helper class made for this purpose.

http://dl.getdropbox.com/u/178748/mpl/parasite_axes2.py

import matplotlib.pyplot as plt
from parasite_axes2 import SubplotHost

f = plt.figure(2)
ax = SubplotHost(f, 1, 1, 1)
f.add_subplot(ax)

ax.plot([20,30], [0, 5], color="red", lw=5, zorder=10)
ax2=ax.twinx()
ax2.grid(ls="-", lw=5, zorder=-1)
ax2.set_axisbelow(True)

plt.show()

-JJ

···

On Sun, Jan 18, 2009 at 7:48 AM, Olle Engdegård <olle@...2457...> wrote:

Hi,

Does the zorder work between twin axis? I can't get lines on the first
axis to be on top of the second grid:

plot([20,30], [0, 5], color="red", lw=5, zorder=10)
ax2=twinx()
grid(ls="-", lw=5, zorder=-1)
ax2.set_axisbelow(True)
title("Why doesn't the read line go above the second axis?")

Cheers,
Olle

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