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Fix autoscaling with twinx and vspans: consider axis with one pair of finite limits ONLY #8513

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Merged
merged 1 commit into from
Apr 24, 2017
Merged

Fix autoscaling with twinx and vspans: consider axis with one pair of finite limits ONLY #8513

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7 changes: 7 additions & 0 deletions lib/matplotlib/axes/_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2272,7 +2272,14 @@ def handle_single_axis(scale, autoscaleon, shared_axes, interval,
# ignore non-finite data limits if good limits exist
finite_dl = [d for d in dl if np.isfinite(d).all()]
if len(finite_dl):
# if finite limits exist for atleast one axis (and the other is infinite), restore the
# finite limits
x_finite = [d for d in dl if (np.isfinite(d.intervalx).all() and (d not in finite_dl))]
y_finite = [d for d in dl if (np.isfinite(d.intervaly).all() and (d not in finite_dl))]

dl = finite_dl
dl.extend(x_finite)
dl.extend(y_finite)

bb = mtransforms.BboxBase.union(dl)
x0, x1 = getattr(bb, interval)
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15 changes: 15 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -5134,3 +5134,18 @@ def test_minorticks_on(xscale, yscale):
ax.set_xscale(xscale)
ax.set_yscale(yscale)
ax.minorticks_on()


def test_twinx_knows_limits():
fig, ax = plt.subplots()

ax.axvspan(1, 2)
xtwin = ax.twinx()
xtwin.plot([0, 0.5], [1, 2])
# control axis
fig2, ax2 = plt.subplots()

ax2.axvspan(1, 2)
ax2.plot([0, 0.5], [1, 2])

assert((xtwin.viewLim.intervalx == ax2.viewLim.intervalx).all())