1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
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
admin_media_prefix = settings.ADMIN_MEDIA_PREFIX
map_width = 600
map_height = 400
map_srid = 4326
map_template = 'gis/admin/openlayers.html'
openlayers_url = 'http://openlayers.org/api/2.6/OpenLayers.js'
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):
# 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 in ('MULTIPOINT', 'MULTILINESTRING', 'MULTIPOLYGON', 'GEOMETRYCOLLECTION')
if is_collection:
if db_field._geom == 'GEOMETRYCOLLECTION': collection_type = 'Any'
else: collection_type = OGRGeomType(db_field._geom.replace('MULTI', ''))
else:
collection_type = 'None'
class OLMap(self.widget):
template = self.map_template
geom_type = db_field._geom
params = {'admin_media_prefix' : self.admin_media_prefix,
'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),
'field_name' : db_field.name,
'is_collection' : is_collection,
'scrollable' : self.scrollable,
'layerswitcher' : self.layerswitcher,
'collection_type' : collection_type,
'is_linestring' : db_field._geom in ('LINESTRING', 'MULTILINESTRING'),
'is_polygon' : db_field._geom in ('POLYGON', 'MULTIPOLYGON'),
'is_point' : db_field._geom 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,
'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
units = 'm'
|
