convert mapdata.models.geometry into python package

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

@@ -0,0 +1,47 @@
+from collections import OrderedDict
+from shapely.geometry import mapping, Point
+
+from c3nav.mapdata.fields import GeometryField
+from c3nav.mapdata.models.base import Feature, FeatureBase
+from c3nav.mapdata.utils.json import format_geojson
+
+GEOMETRY_FEATURE_TYPES = OrderedDict()
+
+
+class GeometryFeatureBase(FeatureBase):
+    def __new__(mcs, name, bases, attrs):
+        cls = super().__new__(mcs, name, bases, attrs)
+        if not cls._meta.abstract:
+            GEOMETRY_FEATURE_TYPES[name.lower()] = cls
+        return cls
+
+
+class GeometryFeature(Feature, metaclass=GeometryFeatureBase):
+    """
+    A map feature with a geometry
+    """
+    geometry = GeometryField()
+
+    geomtype = None
+
+    class Meta:
+        abstract = True
+
+    def get_geojson_properties(self):
+        return OrderedDict((
+            ('type', self.__class__.__name__.lower()),
+            ('id', self.id),
+        ))
+
+    def to_geojson(self):
+        return OrderedDict((
+            ('type', 'Feature'),
+            ('properties', self.get_geojson_properties()),
+            ('geometry', format_geojson(mapping(self.geometry), round=False)),
+        ))
+
+    def get_shadow_geojson(self):
+        return None
+
+    def contains(self, x, y):
+        return self.geometry.contains(Point(x, y))