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BUG: Plotting use FixedLocator #26185

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Merged
merged 7 commits into from
Apr 30, 2019
Merged

BUG: Plotting use FixedLocator #26185

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2e732b1
BUG: Plotting use FixedLocator
nrebena Apr 22, 2019
7cea50a
TST: Add test for #7612 #22334 #15912
Apr 23, 2019
7e67f99
CLN: Fiex visual indent for PEP8
Apr 23, 2019
3620080
TST: Split test for #15912
Apr 24, 2019
f343631
CLN: Fix import position in _post_plot_logic_common
Apr 24, 2019
62874fb
DOC: Add whatsnew entry in Plotting
Apr 24, 2019
863ba3d
DOC: Minor doc correction in whatsnew entry
nrebena Apr 30, 2019
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13 changes: 11 additions & 2 deletions pandas/plotting/_core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -410,8 +410,13 @@ def get_label(i):

if self.orientation == 'vertical' or self.orientation is None:
if self._need_to_set_index:
xticklabels = [get_label(x) for x in ax.get_xticks()]
xticks = ax.get_xticks()
xticklabels = [get_label(x) for x in xticks]
ax.set_xticklabels(xticklabels)
from matplotlib.ticker import FixedLocator, FixedFormatter
ax.xaxis.set_major_locator(FixedLocator(xticks))
ax.xaxis.set_major_formatter(FixedFormatter(xticklabels))

self._apply_axis_properties(ax.xaxis, rot=self.rot,
fontsize=self.fontsize)
self._apply_axis_properties(ax.yaxis, fontsize=self.fontsize)
Expand All @@ -422,8 +427,12 @@ def get_label(i):

elif self.orientation == 'horizontal':
if self._need_to_set_index:
yticklabels = [get_label(y) for y in ax.get_yticks()]
yticks = ax.get_yticks()
yticklabels = [get_label(y) for y in yticks]
ax.set_yticklabels(yticklabels)
from matplotlib.ticker import FixedLocator, FixedFormatter
ax.xaxis.set_major_locator(FixedLocator(yticks))
ax.xaxis.set_major_formatter(FixedFormatter(yticklabels))
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Why is the x axis given the y-tick(label)s here? Seems like an error to me.
Meaning the "horizontal" direction is not sufficiently tested.

Also note that ax.set_xticklabels(xticklabels) and ax.xaxis.set_major_formatter(FixedFormatter(xticklabels)) are redundant. One of those lines should be enough.

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This is definitly an error.
And this part is definitly not tested at all. None of the tests in plotting even hit this lines. This is because the self._need_to_set_index is only set to True for plot that have a self.orientation "vertical", so there is no way to go inside this loop.
What is the best course of action? Deleting this part that could never get hits?

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If you have identified dead code you can submit a follow up PR to remove

self._apply_axis_properties(ax.yaxis, rot=self.rot,
fontsize=self.fontsize)
self._apply_axis_properties(ax.xaxis, fontsize=self.fontsize)
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17 changes: 17 additions & 0 deletions pandas/tests/plotting/test_frame.py
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Expand Up @@ -2995,6 +2995,23 @@ def test_secondary_axis_font_size(self, method):
self._check_ticks_props(axes=ax.right_ax,
ylabelsize=fontsize)

@pytest.mark.slow
def test_x_string_values_ticks(self):
# GH: 7612
# GH: 22334
# GH: 15912
df = pd.DataFrame({'sales': [3, 2, 3],
'visits': [20, 42, 28],
'day': ['Monday', 'Tuesday', 'Wednesday']})
ax = df.plot.area(x='day')
ax.set_xlim(-1, 3)
xticklabels = [t.get_text() for t in ax.get_xticklabels()]
labels_position = dict(zip(xticklabels, ax.get_xticks()))
# Testing if the label stayed at the right position
assert labels_position['Monday'] == 0.0
assert labels_position['Tuesday'] == 1.0
assert labels_position['Wednesday'] == 2.0


def _generate_4_axes_via_gridspec():
import matplotlib.pyplot as plt
Expand Down