diff --git a/lib/matplotlib/artist.py b/lib/matplotlib/artist.py
index 1f33b9d3ec11..24a60fd4d121 100644
--- a/lib/matplotlib/artist.py
+++ b/lib/matplotlib/artist.py
@@ -12,6 +12,7 @@
import matplotlib as mpl
from . import _api, cbook
+from .colors import BoundaryNorm
from .cm import ScalarMappable
from .path import Path
from .transforms import (Bbox, IdentityTransform, Transform, TransformedBbox,
@@ -1303,10 +1304,20 @@ def format_cursor_data(self, 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()
+ if isinstance(self.norm, BoundaryNorm):
+ # not an invertible normalization mapping
+ cur_idx = np.argmin(np.abs(self.norm.boundaries - data))
+ neigh_idx = max(0, cur_idx - 1)
+ # use max diff to prevent delta == 0
+ delta = np.diff(
+ self.norm.boundaries[neigh_idx:cur_idx + 2]
+ ).max()
+
+ else:
+ # Midpoints of neighboring color intervals.
+ neighbors = self.norm.inverse(
+ (int(normed * 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.
diff --git a/lib/matplotlib/tests/test_artist.py b/lib/matplotlib/tests/test_artist.py
index a9324f0bea58..0fb1fa442fe7 100644
--- a/lib/matplotlib/tests/test_artist.py
+++ b/lib/matplotlib/tests/test_artist.py
@@ -5,6 +5,8 @@
import pytest
+from matplotlib import cm
+import matplotlib.colors as mcolors
import matplotlib.pyplot as plt
import matplotlib.patches as mpatches
import matplotlib.lines as mlines
@@ -372,3 +374,164 @@ class MyArtist4(MyArtist3):
pass
assert MyArtist4.set is MyArtist3.set
+
+
+def test_format_cursor_data_BoundaryNorm():
+ """Test if cursor data is correct when using BoundaryNorm."""
+ X = np.empty((3, 3))
+ X[0, 0] = 0.9
+ X[0, 1] = 0.99
+ X[0, 2] = 0.999
+ X[1, 0] = -1
+ X[1, 1] = 0
+ X[1, 2] = 1
+ X[2, 0] = 0.09
+ X[2, 1] = 0.009
+ X[2, 2] = 0.0009
+
+ # map range -1..1 to 0..256 in 0.1 steps
+ fig, ax = plt.subplots()
+ fig.suptitle("-1..1 to 0..256 in 0.1")
+ norm = mcolors.BoundaryNorm(np.linspace(-1, 1, 20), 256)
+ img = ax.imshow(X, cmap='RdBu_r', norm=norm)
+
+ labels_list = [
+ "[0.9]",
+ "[1.]",
+ "[1.]",
+ "[-1.0]",
+ "[0.0]",
+ "[1.0]",
+ "[0.09]",
+ "[0.009]",
+ "[0.0009]",
+ ]
+ for v, label in zip(X.flat, labels_list):
+ # label = "[{:-#.{}g}]".format(v, cbook._g_sig_digits(v, 0.1))
+ assert img.format_cursor_data(v) == label
+
+ plt.close()
+
+ # map range -1..1 to 0..256 in 0.01 steps
+ fig, ax = plt.subplots()
+ fig.suptitle("-1..1 to 0..256 in 0.01")
+ cmap = cm.get_cmap('RdBu_r', 200)
+ norm = mcolors.BoundaryNorm(np.linspace(-1, 1, 200), 200)
+ img = ax.imshow(X, cmap=cmap, norm=norm)
+
+ labels_list = [
+ "[0.90]",
+ "[0.99]",
+ "[1.0]",
+ "[-1.00]",
+ "[0.00]",
+ "[1.00]",
+ "[0.09]",
+ "[0.009]",
+ "[0.0009]",
+ ]
+ for v, label in zip(X.flat, labels_list):
+ # label = "[{:-#.{}g}]".format(v, cbook._g_sig_digits(v, 0.01))
+ assert img.format_cursor_data(v) == label
+
+ plt.close()
+
+ # map range -1..1 to 0..256 in 0.01 steps
+ fig, ax = plt.subplots()
+ fig.suptitle("-1..1 to 0..256 in 0.001")
+ cmap = cm.get_cmap('RdBu_r', 2000)
+ norm = mcolors.BoundaryNorm(np.linspace(-1, 1, 2000), 2000)
+ img = ax.imshow(X, cmap=cmap, norm=norm)
+
+ labels_list = [
+ "[0.900]",
+ "[0.990]",
+ "[0.999]",
+ "[-1.000]",
+ "[0.000]",
+ "[1.000]",
+ "[0.090]",
+ "[0.009]",
+ "[0.0009]",
+ ]
+ for v, label in zip(X.flat, labels_list):
+ # label = "[{:-#.{}g}]".format(v, cbook._g_sig_digits(v, 0.001))
+ assert img.format_cursor_data(v) == label
+
+ plt.close()
+
+ # different testing data set with
+ # out of bounds values for 0..1 range
+ X = np.empty((7, 1))
+ X[0] = -1.0
+ X[1] = 0.0
+ X[2] = 0.1
+ X[3] = 0.5
+ X[4] = 0.9
+ X[5] = 1.0
+ X[6] = 2.0
+
+ labels_list = [
+ "[-1.0]",
+ "[0.0]",
+ "[0.1]",
+ "[0.5]",
+ "[0.9]",
+ "[1.0]",
+ "[2.0]",
+ ]
+
+ fig, ax = plt.subplots()
+ fig.suptitle("noclip, neither")
+ norm = mcolors.BoundaryNorm(
+ np.linspace(0, 1, 4, endpoint=True), 256, clip=False, extend='neither')
+ img = ax.imshow(X, cmap='RdBu_r', norm=norm)
+ for v, label in zip(X.flat, labels_list):
+ # label = "[{:-#.{}g}]".format(v, cbook._g_sig_digits(v, 0.33))
+ assert img.format_cursor_data(v) == label
+
+ plt.close()
+
+ fig, ax = plt.subplots()
+ fig.suptitle("noclip, min")
+ norm = mcolors.BoundaryNorm(
+ np.linspace(0, 1, 4, endpoint=True), 256, clip=False, extend='min')
+ img = ax.imshow(X, cmap='RdBu_r', norm=norm)
+ for v, label in zip(X.flat, labels_list):
+ # label = "[{:-#.{}g}]".format(v, cbook._g_sig_digits(v, 0.33))
+ assert img.format_cursor_data(v) == label
+
+ plt.close()
+
+ fig, ax = plt.subplots()
+ fig.suptitle("noclip, max")
+ norm = mcolors.BoundaryNorm(
+ np.linspace(0, 1, 4, endpoint=True), 256, clip=False, extend='max')
+ img = ax.imshow(X, cmap='RdBu_r', norm=norm)
+ for v, label in zip(X.flat, labels_list):
+ # label = "[{:-#.{}g}]".format(v, cbook._g_sig_digits(v, 0.33))
+ assert img.format_cursor_data(v) == label
+
+ plt.close()
+
+ fig, ax = plt.subplots()
+ fig.suptitle("noclip, both")
+ norm = mcolors.BoundaryNorm(
+ np.linspace(0, 1, 4, endpoint=True), 256, clip=False, extend='both')
+ img = ax.imshow(X, cmap='RdBu_r', norm=norm)
+ for v, label in zip(X.flat, labels_list):
+ # label = "[{:-#.{}g}]".format(v, cbook._g_sig_digits(v, 0.33))
+ assert img.format_cursor_data(v) == label
+
+ plt.close()
+
+ fig, ax = plt.subplots()
+ fig.suptitle("clip, neither")
+ norm = mcolors.BoundaryNorm(
+ np.linspace(0, 1, 4, endpoint=True), 256, clip=True, extend='neither')
+ img = ax.imshow(X, cmap='RdBu_r', norm=norm)
+ for v, label in zip(X.flat, labels_list):
+ # label = "[{:-#.{}g}]".format(v, cbook._g_sig_digits(v, 0.33))
+ assert img.format_cursor_data(v) == label
+
+ plt.close()
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