Commit2896fc1

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Merge pull request#28656 from meeseeksmachine/auto-backport-of-pr-28649-on-v3.9.x

Backport PR#28649 on branch v3.9.x (FIX: improve formatting of image values in cases of singular norms)

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Lines changed: 3 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1346,7 +1346,9 @@ def format_cursor_data(self, data):`
`1346`	`1346`	`delta=np.diff(`
`1347`	`1347`	`self.norm.boundaries[neigh_idx:cur_idx+2]`
`1348`	`1348`	`).max()`
`1349`		`-`
	`1349`	`+elifself.norm.vmin==self.norm.vmax:`
	`1350`	`+# singular norms, use delta of 10% of only value`
	`1351`	`+delta=np.abs(self.norm.vmin*.1)`
`1350`	`1352`	`else:`
`1351`	`1353`	`# Midpoints of neighboring color intervals.`
`1352`	`1354`	`neighbors=self.norm.inverse(`

Lines changed: 4 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -2252,6 +2252,10 @@ def _g_sig_digits(value, delta):`
`2252`	`2252`	`it is known with an error of delta.`
`2253`	`2253`	`"""`
`2254`	`2254`	`ifdelta==0:`
	`2255`	`+ifvalue==0:`
	`2256`	`+# if both value and delta are 0, np.spacing below returns 5e-324`
	`2257`	`+# which results in rather silly results`
	`2258`	`+return3`
`2255`	`2259`	`# delta = 0 may occur when trying to format values over a tiny range;`
`2256`	`2260`	`# in that case, replace it by the distance to the closest float.`
`2257`	`2261`	`delta=abs(np.spacing(value))`

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -411,7 +411,8 @@ def test_cursor_data_nonuniform(xy, data):`
`411`	`411`	`([[.123,.987]],"[0.123]"),`
`412`	`412`	`([[np.nan,1,2]],"[]"),`
`413`	`413`	`([[1,1+1e-15]],"[1.0000000000000000]"),`
`414`		`- ([[-1,-1]],"[-1.0000000000000000]"),`
	`414`	`+ ([[-1,-1]],"[-1.0]"),`
	`415`	`+ ([[0,0]],"[0.00]"),`
`415`	`416`	`])`
`416`	`417`	`deftest_format_cursor_data(data,text):`
`417`	`418`	`frommatplotlib.backend_basesimportMouseEvent`

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