Index improvment: group locations whith the same name and the same position

ocitysmap2/__init__.py

@@ -447,6 +447,7 @@ SELECT ST_AsText(ST_LongestLine(
             # Update the street_index to reflect the grid's actual position
             if renderer.grid and street_index:
                 street_index.apply_grid(renderer.grid)
+                street_index.group_identical_grid_locations()
 
             # Perform the actual rendering to the Cairo devices
             for output_format in output_formats:

ocitysmap2/indexlib/__init__.py

@@ -76,6 +76,7 @@ if __name__ == '__main__':
     # Map index to grid
     grid = Grid(bbox, rtl = False)
     street_index.apply_grid(grid)
+    street_index.group_identical_grid_locations()
 
     index = StreetIndexRenderer(i18nMock(False), street_index.categories)
 
@@ -121,6 +122,7 @@ if __name__ == '__main__':
     # Map index to grid
     grid = Grid(bbox, rtl = True)
     street_index.apply_grid(grid)
+    street_index.group_identical_grid_locations()
 
     index = StreetIndexRenderer(i18nMock(True), street_index.categories)
     _render('height', 'top')

ocitysmap2/indexlib/commons.py

@@ -45,11 +45,13 @@ class IndexCategory:
     """
     name = None
     items = None
+    is_street = False
 
-    def __init__(self, name, items = None):
+    def __init__(self, name, items=None, is_street=True):
         assert name is not None
-        self.name  = name
+        self.name = name
         self.items = items or list()
+        self.is_street = is_street
 
     def __str__(self):
         return '<%s (%s)>' % (self.name, map(str, self.items))
@@ -197,7 +199,6 @@ class IndexItem:
             self.location_str = "%s-%s" % (min(ep1_label, ep2_label),
                                            max(ep1_label, ep2_label))
 
-
 if __name__ == "__main__":
     import cairo
     import pangocairo

ocitysmap2/indexlib/indexer.py

@@ -28,6 +28,7 @@ import locale
 import psycopg2
 import csv
 import datetime
+from itertools import groupby
 
 import commons
 from ocitysmap2 import coords
@@ -81,12 +82,30 @@ class StreetIndex:
            compute the location strings
 
         Returns:
-           Nothing, but self._categories will have been modified !
+           Nothing, but self._categories has been modified!
         """
         for category in self._categories:
             for item in category.items:
                 item.update_location_str(grid)
 
+    def group_identical_grid_locations(self):
+        """
+        Group locations whith the same name and the same position on the grid.
+
+        Returns:
+           Nothing, but self._categories has been modified!
+        """
+        categories = []
+        for category in self._categories:
+            if category.is_street:
+                categories.append(category)
+                continue
+            grouped_items = []
+            sort_key = lambda item:(item.label, item.location_str)
+            items = sorted(category.items, key=sort_key)
+            for label, same_items in groupby(items, key=sort_key):
+                grouped_items.append(same_items.next())
+            category.items = grouped_items
 
     def write_to_csv(self, title, output_filename):
         # TODO: implement writing the index to CSV
@@ -283,7 +302,8 @@ from
             # Get the current IndexCategory object, or create one if
             # different than previous
             if (not result or result[-1].name != catname):
-                current_category = commons.IndexCategory(catname)
+                current_category = commons.IndexCategory(catname,
+                                                         is_street=False)
                 result.append(current_category)
             else:
                 current_category = result[-1]