SF.net SVN: matplotlib: [5188] trunk/matplotlib/examples/api/image_zcoord. py

[<jd...@us...>]

Revision: 5188
          http://matplotlib.svn.sourceforge.net/matplotlib/?rev=5188&view=rev
Author:   jdh2358
Date:     2008-05-18 15:31:59 -0700 (Sun, 18 May 2008)

Log Message:
-----------
added z coordinate example for nearest neighbor images

Added Paths:
-----------
    trunk/matplotlib/examples/api/image_zcoord.py

Added: trunk/matplotlib/examples/api/image_zcoord.py
===================================================================
--- trunk/matplotlib/examples/api/image_zcoord.py	                        (rev 0)
+++ trunk/matplotlib/examples/api/image_zcoord.py	2008-05-18 22:31:59 UTC (rev 5188)
@@ -0,0 +1,27 @@
+"""
+Show how to modify the coordinate formatter to report the image "z"
+value of the nearest pixel given x and y
+"""
+import numpy as np
+import matplotlib.pyplot as plt
+import matplotlib.cm as cm
+
+X = 10*np.random.rand(5,3)
+
+fig = plt.figure()
+ax = fig.add_subplot(111)
+ax.imshow(X, cmap=cm.jet, interpolation='nearest')
+
+numrows, numcols = X.shape
+def format_coord(x, y):
+    col = int(x+0.5)
+    row = int(y+0.5)
+    if col>=0 and col<numcols and row>=0 and row<numrows:
+        z = X[row,col]
+        return 'x=%1.4f, y=%1.4f, z=%1.4f'%(x, y, z)
+    else:
+        return 'x=%1.4f, y=%1.4f'%(x, y)
+
+ax.format_coord = format_coord
+plt.show()
+


This was sent by the SourceForge.net collaborative development platform, the world's largest Open Source development site.