Array of Polygon instead of Set of Polygon. Fixes #61

Author: glennmatthews

aagen/geometry.py

@@ -530,7 +530,7 @@ def loft(*args):
     lines = list(args)
     line1 = lines.pop(0)
     assert line1.length > 0
-    poly_set = set()
+    polys = []
     while len(lines) > 0:
         line2 = lines.pop(0)
         assert line2.length > 0
@@ -583,10 +583,10 @@ def loft(*args):
 
         log.debug("Constructed {0}".format(to_string(poly)))
         if poly is not None:
-            poly_set.add(poly)
+            polys.append(poly)
         line1 = line2
 
-    return shapely.ops.cascaded_union(poly_set)
+    return shapely.ops.cascaded_union(polys)
 
 
 def loft_to_grid(base_line, dir, width):

aagen/map.py

@@ -171,7 +171,7 @@ def add_region(self, region):
     def refresh_conglomerate(self):
         """Regenerate the conglomerate polygon.
         """
-        polygons = set([r.polygon for r in self.regions])
+        polygons = [r.polygon for r in self.regions]
         self.conglomerate_polygon = aagen.geometry.union(polygons)