Merge pull request #24289 from anntzer/iz

timhoffm · web-flow · commit 9b4985e18516 · 2022-10-28T21:15:20.000+02:00
Cleanup image_zcoord example.
diff --git a/examples/images_contours_and_fields/image_zcoord.py b/examples/images_contours_and_fields/image_zcoord.py
@@ -3,12 +3,11 @@
 Modifying the coordinate formatter
 ==================================
 
-Modify the coordinate formatter to report the image "z"
-value of the nearest pixel given x and y.
-This functionality is built in by default, but it
-is still useful to show how to customize the
-`~.axes.Axes.format_coord` function.
+Modify the coordinate formatter to report the image "z" value of the nearest
+pixel given x and y.  This functionality is built in by default; this example
+just showcases how to customize the `~.axes.Axes.format_coord` function.
 """
+
 import numpy as np
 import matplotlib.pyplot as plt
 
@@ -21,17 +20,17 @@
 fig, ax = plt.subplots()
 ax.imshow(X)
 
-numrows, numcols = X.shape
-
 
 def format_coord(x, y):
-    col = int(x + 0.5)
-    row = int(y + 0.5)
-    if 0 <= col < numcols and 0 <= row < numrows:
+    col = round(x)
+    row = round(y)
+    nrows, ncols = X.shape
+    if 0 <= col < ncols and 0 <= row < nrows:
         z = X[row, col]
-        return 'x=%1.4f, y=%1.4f, z=%1.4f' % (x, y, z)
+        return f'x={x:1.4f}, y={y:1.4f}, z={z:1.4f}'
     else:
-        return 'x=%1.4f, y=%1.4f' % (x, y)
+        return f'x={x:1.4f}, y={y:1.4f}'
+
 
 ax.format_coord = format_coord
 plt.show()
