in render_full immediate levels now cast shadows

src/c3nav/mapdata/models/level.py

@@ -1,10 +1,12 @@
 from django.db import models
 from django.utils.functional import cached_property
 from django.utils.translation import ugettext_lazy as _
+from shapely.geometry import CAP_STYLE
 from shapely.geometry import JOIN_STYLE
 from shapely.ops import cascaded_union
 
 from c3nav.mapdata.models.base import MapItem
+from c3nav.mapdata.utils import assert_multipolygon
 
 
 class Level(MapItem):
@@ -136,3 +138,30 @@ class LevelGeometries():
     @cached_property
     def doors(self):
         return self.raw_doors.difference(self.areas)
+
+    def get_levelconnectors(self, to_level=None):
+        queryset = self.level.levelconnectors.prefetch_related('levels')
+        print(to_level)
+        if to_level is not None:
+            queryset = queryset.filter(levels=to_level)
+        for item in queryset:
+            print(item.levels)
+        return cascaded_union([levelconnector.geometry for levelconnector in queryset])
+
+    @cached_property
+    def levelconnectors(self):
+        return self.get_levelconnectors()
+
+    def intermediate_shadows(self, to_level=None):
+        rings = []
+        for polygon in assert_multipolygon(self.buildings):
+            rings.append(polygon.exterior)
+            rings.extend(polygon.interiors)
+
+        objects = []
+        levelconnectors = self.get_levelconnectors(to_level)
+        for ring in rings:
+            objects.append(ring.difference(levelconnectors))
+        lines = cascaded_union(objects)
+
+        return lines.buffer(0.1, cap_style=CAP_STYLE.flat, join_style=JOIN_STYLE.mitre)