Restored the old implementation of the SphericalPolygon.__init__(...) for the case of empty list of points which was designed to remove a RuntimeWarning at the first run of the code (see Ticket # 1079). For unknown reasons, this change was lost during last commit by Mike.

Moved point vector-normalization from the add_node method to Node.__init__(...) in graph.py.

Removed skyline.py from the 'sphere' module. The original implementation of skyline.py did not work correctly (see, e.g., tickets #1080, #1081, #1082) and overall it makes sense to separate image processing and statistical analysis from "pure" geometric operations handled by the 'sphere'.



git-svn-id: http://svn.stsci.edu/svn/ssb/stsci_python/stsci_python/branches/sphere@29976 fe389314-cf27-0410-b35b-8c050e845b92

Former-commit-id: 82f06f5b25c8cc262bfbc0b57e3e774d320bcf47

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/polygon.py b/lib/polygon.py
index b20e0b1..e9ad379 100644
--- a/lib/polygon.py
+++ b/lib/polygon.py
@@ -78,12 +78,18 @@ class SphericalPolygon(object):
             mean of the points will be used.
         """
         if len(points) == 0:
-            pass
+            # handle special case of initializing with an empty list of
+            # vertices (ticket #1079).
+            self._inside = np.zeros(3)
+            self._points = np.asanyarray(points)
+            return
         elif len(points) < 3:
             raise ValueError("Polygon made of too few points")
         else:
             assert np.array_equal(points[0], points[-1]), 'Polygon is not closed'
+
         self._points = np.asanyarray(points)
+
         if inside is None:
             self._inside = np.mean(points[:-1], axis=0)
         else: