add Space.outside (for correct rendering)

src/c3nav/mapdata/migrations/0003_space_outside.py

@@ -0,0 +1,32 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.7 on 2017-05-12 20:59
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+from shapely.ops import cascaded_union
+
+
+def set_space_outside(apps, schema_editor):
+    Section = apps.get_model('mapdata', 'Section')
+    for section in Section.objects.all():
+        building_geometries = cascaded_union(tuple(building.geometry for building in section.buildings.all()))
+        for space in section.spaces.all():
+            if space.geometry.intersection(building_geometries).area / space.geometry.area < 0.5:
+                space.outside = True
+                space.save()
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mapdata', '0002_locationredirect'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='space',
+            name='outside',
+            field=models.BooleanField(default=False, verbose_name='is outside of building'),
+        ),
+        migrations.RunPython(set_space_outside),
+    ]

src/c3nav/mapdata/models/geometry/section.py

@@ -62,6 +62,7 @@ class Space(SpecificLocation, LevelSectionGeometryMixin, models.Model):
     )
     geometry = GeometryField('polygon')
     category = models.CharField(verbose_name=_('category'), choices=CATEGORIES, default='', max_length=16)
+    outside = models.BooleanField(default=False, verbose_name=_('is outside of building'))
 
     class Meta:
         verbose_name = _('Space')