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Fix Axis scale on twinned Axes. #18393

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Merged
merged 1 commit into from
Sep 11, 2020
Merged

Fix Axis scale on twinned Axes. #18393

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9 changes: 2 additions & 7 deletions lib/matplotlib/axes/_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -494,8 +494,8 @@ def __init__(self, fig, rect,
self._anchor = 'C'
self._stale_viewlim_x = False
self._stale_viewlim_y = False
self._sharex = None
self._sharey = None
self._sharex = sharex
self._sharey = sharey
self.set_label(label)
self.set_figure(fig)
self.set_box_aspect(box_aspect)
Expand All @@ -516,11 +516,6 @@ def __init__(self, fig, rect,
self._rasterization_zorder = None
self.cla()

if sharex is not None:
self.sharex(sharex)
if sharey is not None:
self.sharey(sharey)

# funcs used to format x and y - fall back on major formatters
self.fmt_xdata = None
self.fmt_ydata = None
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44 changes: 44 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -305,6 +305,50 @@ def test_twinx_cla():
assert ax.yaxis.get_visible()


@pytest.mark.parametrize('twin', ('x', 'y'))
@check_figures_equal(extensions=['png'], tol=0.19)
def test_twin_logscale(fig_test, fig_ref, twin):
twin_func = f'twin{twin}' # test twinx or twiny
set_scale = f'set_{twin}scale'
x = np.arange(1, 100)

# Change scale after twinning.
ax_test = fig_test.add_subplot(2, 1, 1)
ax_twin = getattr(ax_test, twin_func)()
getattr(ax_test, set_scale)('log')
ax_twin.plot(x, x)

# Twin after changing scale.
ax_test = fig_test.add_subplot(2, 1, 2)
getattr(ax_test, set_scale)('log')
ax_twin = getattr(ax_test, twin_func)()
ax_twin.plot(x, x)

for i in [1, 2]:
ax_ref = fig_ref.add_subplot(2, 1, i)
getattr(ax_ref, set_scale)('log')
ax_ref.plot(x, x)

# This is a hack because twinned Axes double-draw the frame.
# Remove this when that is fixed.
Path = matplotlib.path.Path
fig_ref.add_artist(
matplotlib.patches.PathPatch(
Path([[0, 0], [0, 1],
[0, 1], [1, 1],
[1, 1], [1, 0],
[1, 0], [0, 0]],
[Path.MOVETO, Path.LINETO] * 4),
transform=ax_ref.transAxes,
facecolor='none',
edgecolor=mpl.rcParams['axes.edgecolor'],
linewidth=mpl.rcParams['axes.linewidth'],
capstyle='projecting'))

remove_ticks_and_titles(fig_test)
remove_ticks_and_titles(fig_ref)


@image_comparison(['twin_autoscale.png'])
def test_twinx_axis_scales():
x = np.array([0, 0.5, 1])
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