from django.conf import settings from django.contrib.admin import ModelAdmin from django.contrib.gis.admin.widgets import OpenLayersWidget from django.contrib.gis.gdal import OGRGeomType from django.contrib.gis.db import models class GeoModelAdmin(ModelAdmin): """ The administration options class for Geographic models. Map settings may be overloaded from their defaults to create custom maps. """ # The default map settings that may be overloaded -- still subject # to API changes. default_lon = 0 default_lat = 0 default_zoom = 4 display_wkt = False display_srid = False extra_js = [] num_zoom = 18 max_zoom = False min_zoom = False units = False max_resolution = False max_extent = False modifiable = True mouse_position = True scale_text = True layerswitcher = True scrollable = True map_width = 600 map_height = 400 map_srid = 4326 map_template = 'gis/admin/openlayers.html' openlayers_url = 'http://openlayers.org/api/2.8/OpenLayers.js' point_zoom = num_zoom - 6 wms_url = 'http://labs.metacarta.com/wms/vmap0' wms_layer = 'basic' wms_name = 'OpenLayers WMS' debug = False widget = OpenLayersWidget def _media(self): "Injects OpenLayers JavaScript into the admin." media = super(GeoModelAdmin, self)._media() media.add_js([self.openlayers_url]) media.add_js(self.extra_js) return media media = property(_media) def formfield_for_dbfield(self, db_field, **kwargs): """ Overloaded from ModelAdmin so that an OpenLayersWidget is used for viewing/editing GeometryFields. """ if isinstance(db_field, models.GeometryField): request = kwargs.pop('request', None) # Setting the widget with the newly defined widget. kwargs['widget'] = self.get_map_widget(db_field) return db_field.formfield(**kwargs) else: return super(GeoModelAdmin, self).formfield_for_dbfield(db_field, **kwargs) def get_map_widget(self, db_field): """ Returns a subclass of the OpenLayersWidget (or whatever was specified in the `widget` attribute) using the settings from the attributes set in this class. """ is_collection = db_field.geom_type in ('MULTIPOINT', 'MULTILINESTRING', 'MULTIPOLYGON', 'GEOMETRYCOLLECTION') if is_collection: if db_field.geom_type == 'GEOMETRYCOLLECTION': collection_type = 'Any' else: collection_type = OGRGeomType(db_field.geom_type.replace('MULTI', '')) else: collection_type = 'None' class OLMap(self.widget): template = self.map_template geom_type = db_field.geom_type params = {'default_lon' : self.default_lon, 'default_lat' : self.default_lat, 'default_zoom' : self.default_zoom, 'display_wkt' : self.debug or self.display_wkt, 'geom_type' : OGRGeomType(db_field.geom_type), 'field_name' : db_field.name, 'is_collection' : is_collection, 'scrollable' : self.scrollable, 'layerswitcher' : self.layerswitcher, 'collection_type' : collection_type, 'is_linestring' : db_field.geom_type in ('LINESTRING', 'MULTILINESTRING'), 'is_polygon' : db_field.geom_type in ('POLYGON', 'MULTIPOLYGON'), 'is_point' : db_field.geom_type in ('POINT', 'MULTIPOINT'), 'num_zoom' : self.num_zoom, 'max_zoom' : self.max_zoom, 'min_zoom' : self.min_zoom, 'units' : self.units, #likely shoud get from object 'max_resolution' : self.max_resolution, 'max_extent' : self.max_extent, 'modifiable' : self.modifiable, 'mouse_position' : self.mouse_position, 'scale_text' : self.scale_text, 'map_width' : self.map_width, 'map_height' : self.map_height, 'point_zoom' : self.point_zoom, 'srid' : self.map_srid, 'display_srid' : self.display_srid, 'wms_url' : self.wms_url, 'wms_layer' : self.wms_layer, 'wms_name' : self.wms_name, 'debug' : self.debug, } return OLMap from django.contrib.gis import gdal if gdal.HAS_GDAL: class OSMGeoAdmin(GeoModelAdmin): map_template = 'gis/admin/osm.html' extra_js = ['http://openstreetmap.org/openlayers/OpenStreetMap.js'] num_zoom = 20 map_srid = 900913 max_extent = '-20037508,-20037508,20037508,20037508' max_resolution = 156543.0339 point_zoom = num_zoom - 6 units = 'm'