round geometry to centimeter precision

src/c3nav/mapdata/fields.py

@@ -3,7 +3,7 @@ import json
 from django.db import models
 from shapely.geometry import mapping, shape
 
-from c3nav.mapdata.utils import sort_geojson
+from c3nav.mapdata.utils import format_geojson
 
 
 class GeometryField(models.TextField):
@@ -16,7 +16,7 @@ class GeometryField(models.TextField):
         return shape(json.loads(value))
 
     def get_prep_value(self, value):
-        return json.dumps(sort_geojson(mapping(value)))
+        return json.dumps(format_geojson(mapping(value)))
 
 
 class JSONField(models.TextField):

src/c3nav/mapdata/models/feature.py

@@ -7,7 +7,7 @@ from django.utils.translation import activate, get_language
 from shapely.geometry import mapping, shape
 
 from c3nav.mapdata.fields import GeometryField, JSONField
-from c3nav.mapdata.utils import sort_geojson
+from c3nav.mapdata.utils import format_geojson
 
 
 class FeatureType(namedtuple('FeatureType', ('name', 'title', 'title_plural', 'geomtype', 'color'))):
@@ -105,5 +105,5 @@ class Feature(models.Model):
         return OrderedDict((
             ('titles', OrderedDict(sorted(self.titles.items()))),
             ('level', self.level.name),
-            ('geometry', sort_geojson(mapping(self.geometry)))
+            ('geometry', format_geojson(mapping(self.geometry)))
         ))

src/c3nav/mapdata/serializers.py

@@ -8,7 +8,7 @@ from c3nav.api.serializers import RecursiveSerializerMixin
 from c3nav.editor.hosters import get_hoster_for_package
 from c3nav.mapdata.models import Feature, Level, Package, Source
 from c3nav.mapdata.models.feature import FEATURE_TYPES
-from c3nav.mapdata.utils import sort_geojson
+from c3nav.mapdata.utils import format_geojson
 
 
 class GeometryField(serializers.DictField):
@@ -20,7 +20,7 @@ class GeometryField(serializers.DictField):
     }
 
     def to_representation(self, obj):
-        geojson = sort_geojson(mapping(obj))
+        geojson = format_geojson(mapping(obj), round=False)
         return super().to_representation(geojson)
 
     def to_internal_value(self, data):

src/c3nav/mapdata/utils.py

@@ -33,8 +33,15 @@ def json_encoder_reindent(method, data, *args, **kwargs):
         return result.replace(b'"'+magic_marker, b'').replace(magic_marker+b'"', b'')
 
 
-def sort_geojson(data):
+def format_geojson(data, round=True):
     return OrderedDict((
         ('type', data['type']),
-        ('coordinates', data['coordinates']),
+        ('coordinates', round_coordinates(data['coordinates']) if round else data['coordinates']),
     ))
+
+
+def round_coordinates(data):
+    if isinstance(data, (list, tuple)):
+        return tuple(round_coordinates(item) for item in data)
+    else:
+        return round(data, 2)