10000 ParasiteAxes over plotting · Issue #9051 · matplotlib/matplotlib · GitHub
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ParasiteAxes over plotting #9051
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@thehubbard

Description

@thehubbard

Bug report

Bug summary

Axis 7401 labels and ticks are being over plotted, i.e. plotted more than once when using ParasiteAxes and subplot host. This causes the output to appear bold along certain axes.

Code for reproduction

Modified version of https://matplotlib.org/mpl_toolkits/axes_grid/users/overview.html to demonstrate location of over plotting.

from mpl_toolkits.axes_grid1 import host_subplot
import mpl_toolkits.axisartist as AA
import matplotlib.pyplot as plt


host = host_subplot(111, axes_class=AA.Axes)
plt.subplots_adjust(right=0.75)

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

offset = 60
new_fixed_axis = par2.get_grid_helper().new_fixed_axis
par2.axis["right"] = new_fixed_axis(loc="right",
                                    axes=par2,
                                    offset=(offset, 0))
    
par2.axis["right"].toggle(all=True)



host.set_xlim(0, 2)
host.set_ylim(0, 2)

host.set_xlabel("X-Overplotted")
host.set_ylabel("Y-Overplotted")
par1.set_ylabel("Axis is fine")
par2.set_ylabel("Axis is fine")

p1, = host.plot([0, 1, 2], [0, 1, 2])
p2, = par1.plot([0, 1, 2], [0, 3, 2])
p3, = par2.plot([0, 1, 2], [50, 30, 15])

par1.set_ylim(0, 4)
par2.set_ylim(1, 65)

host.axis["left"].label.set_color(p1.get_color())
par1.axis["right"].label.set_color(p2.get_color())
par2.axis["right"].label.set_color(p3.get_color())

plt.draw()
plt.show()

Actual outcome

As expected the x-axis and the left hand y-axis is bold due to over plotting.
over_plot

This is also seen in the figure in the documentation from
https://matplotlib.org/mpl_toolkits/axes_grid/users/overview.html#axisartist-with-parasiteaxes

Expected outcome

over_plot_142

This appeared to work fine in Matplotlib 1.4.2
http://matplotlib.org/1.4.2/mpl_toolkits/axes_grid/users/overview#axisartist-with-parasiteaxes

Thank you, in advance :)
Matplotlib version

  • Operating System: Ubuntu 16.04.3 LTS
  • Matplotlib Version: 2.0.2
  • Python Version: 2.7.12

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