136 lines
5.2 KiB
Python
136 lines
5.2 KiB
Python
from django.contrib.admin import ModelAdmin
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from django.contrib.gis.admin.widgets import OpenLayersWidget
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from django.contrib.gis.db import models
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from django.contrib.gis.gdal import OGRGeomType
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spherical_mercator_srid = 3857
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class GeoModelAdmin(ModelAdmin):
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"""
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The administration options class for Geographic models. Map settings
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may be overloaded from their defaults to create custom maps.
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"""
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# The default map settings that may be overloaded -- still subject
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# to API changes.
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default_lon = 0
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default_lat = 0
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default_zoom = 4
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display_wkt = False
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display_srid = False
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extra_js = []
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num_zoom = 18
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max_zoom = False
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min_zoom = False
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units = False
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max_resolution = False
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max_extent = False
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modifiable = True
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mouse_position = True
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scale_text = True
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layerswitcher = True
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scrollable = True
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map_width = 600
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map_height = 400
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map_srid = 4326
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map_template = 'gis/admin/openlayers.html'
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openlayers_url = 'https://cdnjs.cloudflare.com/ajax/libs/openlayers/2.13.1/OpenLayers.js'
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point_zoom = num_zoom - 6
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wms_url = 'http://vmap0.tiles.osgeo.org/wms/vmap0'
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wms_layer = 'basic'
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wms_name = 'OpenLayers WMS'
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wms_options = {'format': 'image/jpeg'}
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debug = False
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widget = OpenLayersWidget
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@property
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def media(self):
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"Injects OpenLayers JavaScript into the admin."
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media = super().media
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media.add_js([self.openlayers_url])
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media.add_js(self.extra_js)
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return media
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def formfield_for_dbfield(self, db_field, request, **kwargs):
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"""
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Overloaded from ModelAdmin so that an OpenLayersWidget is used
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for viewing/editing 2D GeometryFields (OpenLayers 2 does not support
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3D editing).
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"""
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if isinstance(db_field, models.GeometryField) and db_field.dim < 3:
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# Setting the widget with the newly defined widget.
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kwargs['widget'] = self.get_map_widget(db_field)
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return db_field.formfield(**kwargs)
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else:
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return super().formfield_for_dbfield(db_field, request, **kwargs)
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def get_map_widget(self, db_field):
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"""
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Returns a subclass of the OpenLayersWidget (or whatever was specified
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in the `widget` attribute) using the settings from the attributes set
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in this class.
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"""
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is_collection = db_field.geom_type in ('MULTIPOINT', 'MULTILINESTRING', 'MULTIPOLYGON', 'GEOMETRYCOLLECTION')
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if is_collection:
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if db_field.geom_type == 'GEOMETRYCOLLECTION':
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collection_type = 'Any'
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else:
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collection_type = OGRGeomType(db_field.geom_type.replace('MULTI', ''))
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else:
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collection_type = 'None'
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class OLMap(self.widget):
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template_name = self.map_template
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geom_type = db_field.geom_type
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wms_options = ''
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if self.wms_options:
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wms_options = ["%s: '%s'" % pair for pair in self.wms_options.items()]
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wms_options = ', %s' % ', '.join(wms_options)
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params = {'default_lon': self.default_lon,
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'default_lat': self.default_lat,
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'default_zoom': self.default_zoom,
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'display_wkt': self.debug or self.display_wkt,
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'geom_type': OGRGeomType(db_field.geom_type),
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'field_name': db_field.name,
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'is_collection': is_collection,
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'scrollable': self.scrollable,
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'layerswitcher': self.layerswitcher,
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'collection_type': collection_type,
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'is_generic': db_field.geom_type == 'GEOMETRY',
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'is_linestring': db_field.geom_type in ('LINESTRING', 'MULTILINESTRING'),
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'is_polygon': db_field.geom_type in ('POLYGON', 'MULTIPOLYGON'),
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'is_point': db_field.geom_type in ('POINT', 'MULTIPOINT'),
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'num_zoom': self.num_zoom,
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'max_zoom': self.max_zoom,
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'min_zoom': self.min_zoom,
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'units': self.units, # likely should get from object
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'max_resolution': self.max_resolution,
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'max_extent': self.max_extent,
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'modifiable': self.modifiable,
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'mouse_position': self.mouse_position,
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'scale_text': self.scale_text,
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'map_width': self.map_width,
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'map_height': self.map_height,
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'point_zoom': self.point_zoom,
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'srid': self.map_srid,
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'display_srid': self.display_srid,
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'wms_url': self.wms_url,
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'wms_layer': self.wms_layer,
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'wms_name': self.wms_name,
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'wms_options': wms_options,
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'debug': self.debug,
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}
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return OLMap
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class OSMGeoAdmin(GeoModelAdmin):
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map_template = 'gis/admin/osm.html'
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num_zoom = 20
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map_srid = spherical_mercator_srid
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max_extent = '-20037508,-20037508,20037508,20037508'
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max_resolution = '156543.0339'
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point_zoom = num_zoom - 6
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units = 'm'
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