diff --git a/lib/matplotlib/tests/test_ticker.py b/lib/matplotlib/tests/test_ticker.py
index 263df149de5d..611b5cf968d8 100644
--- a/lib/matplotlib/tests/test_ticker.py
+++ b/lib/matplotlib/tests/test_ticker.py
@@ -510,6 +510,14 @@ class TestScalarFormatter:
(True, (6, 6), (-1e5, 1e5), 6, False),
]
+ cursor_data = [
+ [0., "0.000"],
+ [0.0123, "0.012"],
+ [0.123, "0.123"],
+ [1.23, "1.230"],
+ [12.3, "12.300"],
+ ]
+
@pytest.mark.parametrize('unicode_minus, result',
[(True, "\N{MINUS SIGN}1"), (False, "-1")])
def test_unicode_minus(self, unicode_minus, result):
@@ -556,15 +564,21 @@ def test_scilimits(self, sci_type, scilimits, lim, orderOfMag, fewticks):
tmp_form.set_locs(ax.yaxis.get_majorticklocs())
assert orderOfMag == tmp_form.orderOfMagnitude
- def test_cursor_precision(self):
+ @pytest.mark.parametrize('data, expected', cursor_data)
+ def test_cursor_precision(self, data, expected):
fig, ax = plt.subplots()
ax.set_xlim(-1, 1) # Pointing precision of 0.001.
fmt = ax.xaxis.get_major_formatter().format_data_short
- assert fmt(0.) == "0.000"
- assert fmt(0.0123) == "0.012"
- assert fmt(0.123) == "0.123"
- assert fmt(1.23) == "1.230"
- assert fmt(12.3) == "12.300"
+ assert fmt(data) == expected
+
+ @pytest.mark.parametrize('data, expected', cursor_data)
+ def test_cursor_dummy_axis(self, data, expected):
+ # Issue #17624
+ sf = mticker.ScalarFormatter()
+ sf.create_dummy_axis()
+ sf.set_bounds(0, 10)
+ fmt = sf.format_data_short
+ assert fmt(data) == expected
class FakeAxis:
diff --git a/lib/matplotlib/ticker.py b/lib/matplotlib/ticker.py
index 31dbf601e531..6c288b6c9144 100644
--- a/lib/matplotlib/ticker.py
+++ b/lib/matplotlib/ticker.py
@@ -198,6 +198,8 @@
class _DummyAxis:
+ __name__ = "dummy"
+
def __init__(self, minpos=0):
self.dataLim = mtransforms.Bbox.unit()
self.viewLim = mtransforms.Bbox.unit()
@@ -693,7 +695,7 @@ def format_data_short(self, value):
if isinstance(value, Integral):
fmt = "%d"
else:
- if self.axis.__name__ in ["xaxis", "yaxis"]:
+ if getattr(self.axis, "__name__", "") in ["xaxis", "yaxis"]:
if self.axis.__name__ == "xaxis":
axis_trf = self.axis.axes.get_xaxis_transform()
axis_inv_trf = axis_trf.inverted()
@@ -708,8 +710,8 @@ def format_data_short(self, value):
screen_xy + [[0, -1], [0, +1]])[:, 1]
delta = abs(neighbor_values - value).max()
else:
- # Rough approximation: no more than 1e4 pixels.
- delta = self.axis.get_view_interval() / 1e4
+ # Rough approximation: no more than 1e4 divisions.
+ delta = np.diff(self.axis.get_view_interval()) / 1e4
# If e.g. value = 45.67 and delta = 0.02, then we want to round to
# 2 digits after the decimal point (floor(log10(0.02)) = -2);
# 45.67 contributes 2 digits before the decimal point
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