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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/2.11/OpenLayers.js'
point_zoom = num_zoom - 6
wms_url = 'http://vmap0.tiles.osgeo.org/wms/vmap0'
wms_layer = 'basic'
wms_name = 'OpenLayers WMS'
wms_options = {'format': 'image/jpeg'}
debug = False
widget = OpenLayersWidget
@property
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
def formfield_for_dbfield(self, db_field, **kwargs):
"""
Overloaded from ModelAdmin so that an OpenLayersWidget is used
for viewing/editing 2D GeometryFields (OpenLayers 2 does not support
3D editing).
"""
if isinstance(db_field, models.GeometryField) and db_field.dim < 3:
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
wms_options = ''
if self.wms_options:
wms_options = ["%s: '%s'" % pair for pair in self.wms_options.items()]
wms_options = ', %s' % ', '.join(wms_options)
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_generic' : db_field.geom_type == 'GEOMETRY',
'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,
'wms_options' : wms_options,
'debug' : self.debug,
}
return OLMap
from django.contrib.gis import gdal
if gdal.HAS_GDAL:
# Use the official spherical mercator projection SRID on versions
# of GDAL that support it; otherwise, fallback to 900913.
if gdal.GDAL_VERSION >= (1, 7):
spherical_mercator_srid = 3857
else:
spherical_mercator_srid = 900913
class OSMGeoAdmin(GeoModelAdmin):
map_template = 'gis/admin/osm.html'
num_zoom = 20
map_srid = spherical_mercator_srid
max_extent = '-20037508,-20037508,20037508,20037508'
max_resolution = '156543.0339'
point_zoom = num_zoom - 6
units = 'm'
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