[ 1697287 ] imshow on log axes broken if axes limits != image extent

mdboom · mdboom · commit bf7f49e57049 · 2007-12-07T19:05:11.000Z
Adds a warning when an image is used on non-linear axes.  Doesn't
really address the problem (see bug report for the reason.)

svn path=/trunk/matplotlib/; revision=4667
diff --git a/lib/matplotlib/image.py b/lib/matplotlib/image.py
@@ -4,7 +4,7 @@
 
 """
 from __future__ import division
-import sys, os
+import sys, os, warnings
 
 import numpy as npy
 
@@ -185,6 +185,9 @@ def make_image(self, magnification=1.0):
 
     def draw(self, renderer, *args, **kwargs):
         if not self.get_visible(): return
+        if (self.axes.get_xscale() != 'linear' or
+            self.axes.get_yscale() != 'linear'):
+            warnings.warn("Images are not supported on non-linear axes.")
         im = self.make_image(renderer.get_image_magnification())
         l, b, widthDisplay, heightDisplay = self.axes.bbox.get_bounds()
         renderer.draw_image(l, b, im, self.axes.bbox)
