[yt-svn] commit/yt: MatthewTurk: Adding a note about slices that have nothing inside them. Closes #362.

[Bitbucket]

1 new commit in yt:


https://bitbucket.org/yt_analysis/yt/changeset/5545661b9e5b/
changeset:   5545661b9e5b
branch:      yt
user:        MatthewTurk
date:        2012-02-16 17:55:10
summary:     Adding a note about slices that have nothing inside them.  Closes #362.
affected #:  2 files

diff -r 306640bd4e4a37f9756d8c4a3e5b3ba7e1087bb9 -r 5545661b9e5b1afbb9b693351bd088f825a40478 yt/utilities/exceptions.py
--- a/yt/utilities/exceptions.py
+++ b/yt/utilities/exceptions.py
@@ -48,3 +48,13 @@
 
     def __str__(self):
         return "The supplied axes are not orthogonal.  %s" % (self.axes)
+
+class YTNoDataInObjectError(YTException):
+    def __init__(self, obj):
+        self.obj_type = getattr(obj, "_type_name", "")
+
+    def __str__(self):
+        s = "The object requested has no data included in it."
+        if self.obj_type == "slice":
+            s += "  It may lie on a grid face.  Try offsetting slightly."
+        return s


diff -r 306640bd4e4a37f9756d8c4a3e5b3ba7e1087bb9 -r 5545661b9e5b1afbb9b693351bd088f825a40478 yt/visualization/plot_types.py
--- a/yt/visualization/plot_types.py
+++ b/yt/visualization/plot_types.py
@@ -36,6 +36,7 @@
     y_dict, \
     axis_names
 from .color_maps import yt_colormaps, is_colormap
+from yt.utilities.exceptions import YTNoDataInObjectError
 
 class CallbackRegistryHandler(object):
     def __init__(self, plot):
@@ -379,6 +380,8 @@
 
     def _redraw_image(self, *args):
         buff = self._get_buff()
+        if self[self.axis_names["Z"]].size == 0:
+            raise YTNoDataInObjectError(self.data)
         mylog.debug("Received buffer of min %s and max %s (data: %s %s)",
                     na.nanmin(buff), na.nanmax(buff),
                     self[self.axis_names["Z"]].min(),

Repository URL: https://bitbucket.org/yt_analysis/yt/

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