Color multiple twinx() axes

matplotlib, python, twinx

Solution

Its not necessary to use the AA class, although normally that would save you a few lines of code. I'm not sure what exactly you want to color since the axes consists of many items which can have a color like spines, label, ticklabels etc.

This example shows how to color most of it, its almost identical to the one in the gallery.

import matplotlib.pyplot as plt

fig, host = plt.subplots()
fig.subplots_adjust(right=0.75)

par1 = host.twinx()
par2 = host.twinx()

# move the spine of the second axes outwards
par2.spines["right"].set_position(("axes", 1.2))

p1, = host.plot([0, 1, 2], [0, 1, 2], 'r-', label="Density")
p2, = par1.plot([0, 1, 2], [0, 3, 2], 'g-', label="Temperature")
p3, = par2.plot([0, 1, 2], [50, 30, 15], 'b-', label="Velocity")

host.set_xlim(0, 2)
host.set_ylim(0, 2)
par1.set_ylim(0, 4)
par2.set_ylim(1, 65)

host.set_xlabel("Distance")
host.set_ylabel("Density")
par1.set_ylabel("Temperature")
par2.set_ylabel("Velocity")

lines = [p1, p2, p3]
host.legend(lines, [l.get_label() for l in lines])

for ax in [par1, par2]:
    ax.set_frame_on(True)
    ax.patch.set_visible(False)

    plt.setp(ax.spines.values(), visible=False)
    ax.spines["right"].set_visible(True)

host.yaxis.label.set_color(p1.get_color())
par1.yaxis.label.set_color(p2.get_color())
par2.yaxis.label.set_color(p3.get_color())

par1.spines["right"].set_edgecolor(p2.get_color())
par2.spines["right"].set_edgecolor(p3.get_color())

host.tick_params(axis='y', colors=p1.get_color())
par1.tick_params(axis='y', colors=p2.get_color())
par2.tick_params(axis='y', colors=p3.get_color())

Problem

Original source