Changeset 7687

Timestamp:

Apr 19, 2010, 1:53:18 PM (14 years ago)

Author:

hudson

Message:

Added naive check for complex polygons, and unit tests to test it.

Location:

anuga_core/source/anuga/utilities

Files:

• polygon.py (modified) (3 diffs)
• test_polygon.py (modified) (1 diff)

anuga_core/source/anuga/utilities/polygon.py

@@ -322 +322 @@
     return False
 
-def is_complex(polygon):
+def is_complex(polygon, verbose=False):
     """Check if a polygon is complex (self-intersecting)
     """
@@ -333 +333 @@
 
                 if (abs(i-j) > 1 and type == 1) or (type == 2 and list(point[0]) != list(point[1])) or (type == 3) and type != 4:
-#                    print 'self-intersecting polygon, type ', type, ' point', point, 'vertex indices ', i, j                
+                    if verbose:
+                        print 'Self-intersecting polygon found, type ', type, ' point', point, 'vertex indices ', i, j                
                     return True
         
@@ -996 +997 @@
     
     # check this is a valid polygon    
-    # JAMES: don't do this check yet, it's too slow, and there is already pathological data in the unit tests.
     # if is_complex(polygon):    
-            # msg = 'Self-intersecting polygon detected in file' + filename +'. '
+            # msg = 'ERROR: Self-intersecting polygon detected in file' + filename +'. '
             # msg += 'Please fix.'
-            # raise Exception, msg
+            # log.critical(msg)
+# #            raise Exception, msg
     
     return polygon

anuga_core/source/anuga/utilities/test_polygon.py

@@ -1806 +1806 @@
         assert res is False
 
+        
     def test_is_polygon_complex(self):
         concave_poly = [[0, 0], [10, 0], [5, 5], [10, 10], [0, 10]]
-        complex_poly = [[0, 0], [10, 0], [5, 5], [5, 15], [5, 7], [10, 10], [0, 10]]
-        
-        assert not is_complex(concave_poly)
-        assert is_complex(complex_poly)
-        
+        complex_poly = [[0, 0], [10, 0], [5, 5], [4, 15], [5, 7], [10, 10], [0, 10]]
+
+        not_complex = is_complex(concave_poly)        
+        complex = is_complex(complex_poly)        
+
+        assert not not_complex
+        assert complex
+
+    def test_is_polygon_complex2(self):
+        concave_poly = [[0, 0], [10, 0], [11,0], [5, 5], [7,6], [10, 10], [1,5], [0, 10]]
+        complex_poly = [[0, 0], [12,12], [10, 0], [5, 5], [3,18], [4, 15], [5, 7], [10, 10], [0, 10], [16, 12]]
+
+        not_complex = is_complex(concave_poly)        
+        complex = is_complex(complex_poly)        
+
+        assert not not_complex
+        assert complex
         
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