django1/django/contrib/gis/admin/options.py

131 lines
5.4 KiB
Python
Raw Normal View History

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/2.7/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
# Using the Beta OSM in the admin requires the following:
# (1) The Google Maps Mercator projection needs to be added
# to your `spatial_ref_sys` table. You'll need at least GDAL 1.5:
# >>> from django.contrib.gis.gdal import SpatialReference
# >>> from django.contrib.gis.utils import add_postgis_srs
# >>> add_postgis_srs(SpatialReference(900913)) # Adding the Google Projection
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'