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FIX: make MaxNLocator only follow visible ticks for order of magnitude #12086

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Merged
NelleV merged 2 commits into from
Sep 14, 2018
Merged

FIX: make MaxNLocator only follow visible ticks for order of magnitude #12086

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ed1c830
FIX: make MaxNLocator only follow visible ticks for order of magnitude
jklymak Sep 11, 2018
9a23d6d
TST: add test for large case
jklymak Sep 11, 2018
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26 changes: 16 additions & 10 deletions lib/matplotlib/tests/test_ticker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -275,15 +275,17 @@ class TestScalarFormatter(object):

use_offset_data = [True, False]

# (sci_type, scilimits, lim, orderOfMag, fewticks)
scilimits_data = [
(False, (0, 0), (10.0, 20.0), 0),
(True, (-2, 2), (-10, 20), 0),
(True, (-2, 2), (-20, 10), 0),
(True, (-2, 2), (-110, 120), 2),
(True, (-2, 2), (-120, 110), 2),
(True, (-2, 2), (-.001, 0.002), -3),
(True, (0, 0), (-1e5, 1e5), 5),
(True, (6, 6), (-1e5, 1e5), 6),
(False, (0, 0), (10.0, 20.0), 0, False),
(True, (-2, 2), (-10, 20), 0, False),
(True, (-2, 2), (-20, 10), 0, False),
(True, (-2, 2), (-110, 120), 2, False),
(True, (-2, 2), (-120, 110), 2, False),
(True, (-2, 2), (-.001, 0.002), -3, False),
(True, (-7, 7), (0.18e10, 0.83e10), 9, True),
(True, (0, 0), (-1e5, 1e5), 5, False),
(True, (6, 6), (-1e5, 1e5), 6, False),
]

@pytest.mark.parametrize('left, right, offset', offset_data)
Expand Down Expand Up @@ -316,14 +318,18 @@ def test_use_offset(self, use_offset):
assert use_offset == tmp_form.get_useOffset()

@pytest.mark.parametrize(
'sci_type, scilimits, lim, orderOfMag', scilimits_data)
def test_scilimits(self, sci_type, scilimits, lim, orderOfMag):
'sci_type, scilimits, lim, orderOfMag, fewticks', scilimits_data)
def test_scilimits(self, sci_type, scilimits, lim, orderOfMag,
fewticks):
tmp_form = mticker.ScalarFormatter()
tmp_form.set_scientific(sci_type)
tmp_form.set_powerlimits(scilimits)
fig, ax = plt.subplots()
ax.yaxis.set_major_formatter(tmp_form)
ax.set_ylim(*lim)
if fewticks:
ax.yaxis.set_major_locator(mticker.MaxNLocator(4))

tmp_form.set_locs(ax.yaxis.get_majorticklocs())
assert orderOfMag == tmp_form.orderOfMagnitude

Expand Down
9 changes: 8 additions & 1 deletion lib/matplotlib/ticker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -712,7 +712,14 @@ def _set_orderOfMagnitude(self, range):
# fixed scaling when lower power limit = upper <> 0.
self.orderOfMagnitude = self._powerlimits[0]
return
locs = np.abs(self.locs)
# restrict to visible ticks
vmin, vmax = sorted(self.axis.get_view_interval())
locs = np.asarray(self.locs)
locs = locs[(vmin <= locs) & (locs <= vmax)]
locs = np.abs(locs)
if not len(locs):
self.orderOfMagnitude = 0
return
if self.offset:
oom = math.floor(math.log10(range))
else:
Expand Down