use image zorder when drawing

astraw · astraw · commit 16b855b21012 · 2009-11-10T21:03:51.000Z
svn path=/trunk/matplotlib/; revision=7950
diff --git a/CHANGELOG b/CHANGELOG
@@ -1,3 +1,12 @@
+2009-11-10 Single images, and all images in renderers with
+           option_image_nocomposite (i.e. agg, macosx and the svg
+           backend when rcParams['svg.image_noscale'] is True), are
+           now drawn respecting the zorder relative to other
+           artists. (Note that there may now be inconsistencies across
+           backends when more than one image is drawn at varying
+           zorders, but this change introduces correct behavior for
+           the backends in which it's easy to do so.)
+
 2009-10-21 Make AutoDateLocator more configurable by adding options
            to control the maximum and minimum number of ticks. Also
            add control of the intervals to be used for ticking. This
diff --git a/lib/matplotlib/axes.py b/lib/matplotlib/axes.py
@@ -1721,7 +1721,8 @@ def draw(self, renderer=None, inframe=False):
 
         if len(self.images)<=1 or renderer.option_image_nocomposite():
             for im in self.images:
-                im.draw(renderer)
+                dsu.append( (im.zorder, len(dsu), im) )
+            dsu.sort() # re-sort with images now
         else:
             # make a composite image blending alpha
             # list of (mimage.Image, ox, oy)
