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Fix format_cursor_data with nans. #21145

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Merged
merged 1 commit into from
Sep 22, 2021
Merged

Fix format_cursor_data with nans. #21145

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17 changes: 12 additions & 5 deletions lib/matplotlib/artist.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1274,11 +1274,18 @@ def format_cursor_data(self, data):
# Artist.format_cursor_data would always have precedence over
# ScalarMappable.format_cursor_data.
n = self.cmap.N
# Midpoints of neighboring color intervals.
neighbors = self.norm.inverse(
(int(self.norm(data) * n) + np.array([0, 1])) / n)
delta = abs(neighbors - data).max()
return "[{:-#.{}g}]".format(data, cbook._g_sig_digits(data, delta))
if np.ma.getmask(data):
return "[]"
normed = self.norm(data)
if np.isfinite(normed):
# Midpoints of neighboring color intervals.
neighbors = self.norm.inverse(
(int(self.norm(data) * n) + np.array([0, 1])) / n)
delta = abs(neighbors - data).max()
g_sig_digits = cbook._g_sig_digits(data, delta)
else:
g_sig_digits = 3 # Consistent with default below.
return "[{:-#.{}g}]".format(data, g_sig_digits)
else:
try:
data[0]
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2 changes: 1 addition & 1 deletion lib/matplotlib/tests/test_image.py
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Original file line number Diff line number Diff line change
Expand Up @@ -340,6 +340,7 @@ def test_cursor_data():
"data, text", [
([[10001, 10000]], "[10001.000]"),
([[.123, .987]], "[0.123]"),
([[np.nan, 1, 2]], "[]"),
])
def test_format_cursor_data(data, text):
from matplotlib.backend_bases import MouseEvent
Expand All @@ -349,7 +350,6 @@ def test_format_cursor_data(data, text):

xdisp, ydisp = ax.transData.transform([0, 0])
event = MouseEvent('motion_notify_event', fig.canvas, xdisp, ydisp)
assert im.get_cursor_data(event) == data[0][0]
assert im.format_cursor_data(im.get_cursor_data(event)) == text


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