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Recommend multiple_yaxis_with_spines over parasite axes. #24207

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Oct 18, 2022
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Recommend multiple_yaxis_with_spines over parasite axes. #24207

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22 changes: 8 additions & 14 deletions examples/axisartist/demo_parasite_axes.py
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Expand Up @@ -9,18 +9,18 @@
This approach uses `mpl_toolkits.axes_grid1.parasite_axes.HostAxes` and
`mpl_toolkits.axes_grid1.parasite_axes.ParasiteAxes`.

An alternative approach using standard Matplotlib subplots is shown in the
:doc:`/gallery/spines/multiple_yaxis_with_spines` example.
The standard and recommended approach is to use instead standard Matplotlib
axes, as shown in the :doc:`/gallery/spines/multiple_yaxis_with_spines`
example.

An alternative approach using :mod:`mpl_toolkits.axes_grid1`
and :mod:`mpl_toolkits.axisartist` is found in the
An alternative approach using `mpl_toolkits.axes_grid1` and
`mpl_toolkits.axisartist` is shown in the
:doc:`/gallery/axisartist/demo_parasite_axes2` example.
"""

from mpl_toolkits.axisartist.parasite_axes import HostAxes
import matplotlib.pyplot as plt


fig = plt.figure()

host = fig.add_axes([0.15, 0.1, 0.65, 0.8], axes_class=HostAxes)
Expand All @@ -39,15 +39,9 @@
p2, = par1.plot([0, 1, 2], [0, 3, 2], label="Temperature")
p3, = par2.plot([0, 1, 2], [50, 30, 15], 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")
host.set(xlim=(0, 2), ylim=(0, 2), xlabel="Distance", ylabel="Density")
par1.set(ylim=(0, 4), ylabel="Temperature")
par2.set(ylim=(1, 65), ylabel="Velocity")

host.legend()

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29 changes: 12 additions & 17 deletions examples/axisartist/demo_parasite_axes2.py
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Expand Up @@ -11,15 +11,16 @@
of those two axis behave separately from each other: different datasets can be
plotted, and the y-limits are adjusted separately.

Note that this approach uses the `mpl_toolkits.axes_grid1.parasite_axes`'
`~mpl_toolkits.axes_grid1.parasite_axes.host_subplot` and
`mpl_toolkits.axisartist.axislines.Axes`. An alternative approach using the
`~mpl_toolkits.axes_grid1.parasite_axes`'s
`~.mpl_toolkits.axes_grid1.parasite_axes.HostAxes` and
`~.mpl_toolkits.axes_grid1.parasite_axes.ParasiteAxes` is the
This approach uses `mpl_toolkits.axes_grid1.parasite_axes.host_subplot` and
`mpl_toolkits.axisartist.axislines.Axes`.

The standard and recommended approach is to use instead standard Matplotlib
axes, as shown in the :doc:`/gallery/spines/multiple_yaxis_with_spines`
example.

An alternative approach using `mpl_toolkits.axes_grid1.parasite_axes.HostAxes`
and `mpl_toolkits.axes_grid1.parasite_axes.ParasiteAxes` is shown in the
:doc:`/gallery/axisartist/demo_parasite_axes` example.
An alternative approach using the usual Matplotlib subplots is shown in
the :doc:`/gallery/spines/multiple_yaxis_with_spines` example.
"""

from mpl_toolkits.axes_grid1 import host_subplot
Expand All @@ -41,15 +42,9 @@
p2, = par1.plot([0, 1, 2], [0, 3, 2], label="Temperature")
p3, = par2.plot([0, 1, 2], [50, 30, 15], 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")
host.set(xlim=(0, 2), ylim=(0, 2), xlabel="Distance", ylabel="Density")
par1.set(ylim=(0, 4), ylabel="Temperature")
par2.set(ylim=(1, 65), ylabel="Velocity")

host.legend()

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37 changes: 14 additions & 23 deletions examples/spines/multiple_yaxis_with_spines.py
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@@ -1,21 +1,20 @@
r"""
==========================
Multiple Yaxis With Spines
==========================
===========================
Multiple y-axis with Spines
===========================

Create multiple y axes with a shared x axis. This is done by creating
a `~.axes.Axes.twinx` axes, turning all spines but the right one invisible
and offset its position using `~.spines.Spine.set_position`.

Note that this approach uses `matplotlib.axes.Axes` and their
`~matplotlib.spines.Spine`\s. An alternative approach for parasite
axes is shown in the :doc:`/gallery/axisartist/demo_parasite_axes` and
`~matplotlib.spines.Spine`\s. Alternative approaches using non-standard axes
are shown in the :doc:`/gallery/axisartist/demo_parasite_axes` and
:doc:`/gallery/axisartist/demo_parasite_axes2` examples.
"""

import matplotlib.pyplot as plt


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

Expand All @@ -26,29 +25,21 @@
# placed on the right by twinx above.
twin2.spines.right.set_position(("axes", 1.2))

p1, = ax.plot([0, 1, 2], [0, 1, 2], "b-", label="Density")
p2, = twin1.plot([0, 1, 2], [0, 3, 2], "r-", label="Temperature")
p3, = twin2.plot([0, 1, 2], [50, 30, 15], "g-", label="Velocity")

ax.set_xlim(0, 2)
ax.set_ylim(0, 2)
twin1.set_ylim(0, 4)
twin2.set_ylim(1, 65)
p1, = ax.plot([0, 1, 2], [0, 1, 2], "C0", label="Density")
p2, = twin1.plot([0, 1, 2], [0, 3, 2], "C1", label="Temperature")
p3, = twin2.plot([0, 1, 2], [50, 30, 15], "C2", label="Velocity")

ax.set_xlabel("Distance")
ax.set_ylabel("Density")
twin1.set_ylabel("Temperature")
twin2.set_ylabel("Velocity")
ax.set(xlim=(0, 2), ylim=(0, 2), xlabel="Distance", ylabel="Density")
twin1.set(ylim=(0, 4), ylabel="Temperature")
twin2.set(ylim=(1, 65), ylabel="Velocity")

ax.yaxis.label.set_color(p1.get_color())
twin1.yaxis.label.set_color(p2.get_color())
twin2.yaxis.label.set_color(p3.get_color())

tkw = dict(size=4, width=1.5)
ax.tick_params(axis='y', colors=p1.get_color(), **tkw)
twin1.tick_params(axis='y', colors=p2.get_color(), **tkw)
twin2.tick_params(axis='y', colors=p3.get_color(), **tkw)
ax.tick_params(axis='x', **tkw)
ax.tick_params(axis='y', colors=p1.get_color())
twin1.tick_params(axis='y', colors=p2.get_color())
twin2.tick_params(axis='y', colors=p3.get_color())

ax.legend(handles=[p1, p2, p3])

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