118 lines
3.7 KiB
Python
118 lines
3.7 KiB
Python
import logging
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from django.conf import settings
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from django.contrib.gis import gdal
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from django.contrib.gis.geometry import json_regex
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from django.contrib.gis.geos import GEOSException, GEOSGeometry
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from django.forms.widgets import Widget
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from django.utils import translation
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logger = logging.getLogger('django.contrib.gis')
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class BaseGeometryWidget(Widget):
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"""
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The base class for rich geometry widgets.
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Render a map using the WKT of the geometry.
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"""
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geom_type = 'GEOMETRY'
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map_srid = 4326
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map_width = 600
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map_height = 400
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display_raw = False
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supports_3d = False
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template_name = '' # set on subclasses
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def __init__(self, attrs=None):
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self.attrs = {}
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for key in ('geom_type', 'map_srid', 'map_width', 'map_height', 'display_raw'):
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self.attrs[key] = getattr(self, key)
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if attrs:
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self.attrs.update(attrs)
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def serialize(self, value):
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return value.wkt if value else ''
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def deserialize(self, value):
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try:
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return GEOSGeometry(value)
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except (GEOSException, ValueError, TypeError) as err:
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logger.error("Error creating geometry from value '%s' (%s)", value, err)
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return None
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def get_context(self, name, value, attrs):
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context = super().get_context(name, value, attrs)
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# If a string reaches here (via a validation error on another
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# field) then just reconstruct the Geometry.
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if value and isinstance(value, str):
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value = self.deserialize(value)
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if value:
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# Check that srid of value and map match
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if value.srid and value.srid != self.map_srid:
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try:
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ogr = value.ogr
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ogr.transform(self.map_srid)
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value = ogr
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except gdal.GDALException as err:
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logger.error(
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"Error transforming geometry from srid '%s' to srid '%s' (%s)",
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value.srid, self.map_srid, err
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)
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context.update(self.build_attrs(self.attrs, {
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'name': name,
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'module': 'geodjango_%s' % name.replace('-', '_'), # JS-safe
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'serialized': self.serialize(value),
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'geom_type': gdal.OGRGeomType(self.attrs['geom_type']),
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'STATIC_URL': settings.STATIC_URL,
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'LANGUAGE_BIDI': translation.get_language_bidi(),
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**(attrs or {}),
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}))
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return context
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class OpenLayersWidget(BaseGeometryWidget):
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template_name = 'gis/openlayers.html'
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map_srid = 3857
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class Media:
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css = {
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'all': (
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'https://cdnjs.cloudflare.com/ajax/libs/ol3/4.6.5/ol.css',
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'gis/css/ol3.css',
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)
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}
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js = (
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'https://cdnjs.cloudflare.com/ajax/libs/ol3/4.6.5/ol.js',
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'gis/js/OLMapWidget.js',
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)
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def serialize(self, value):
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return value.json if value else ''
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def deserialize(self, value):
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geom = super().deserialize(value)
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# GeoJSON assumes WGS84 (4326). Use the map's SRID instead.
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if geom and json_regex.match(value) and self.map_srid != 4326:
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geom.srid = self.map_srid
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return geom
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class OSMWidget(OpenLayersWidget):
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"""
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An OpenLayers/OpenStreetMap-based widget.
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"""
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template_name = 'gis/openlayers-osm.html'
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default_lon = 5
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default_lat = 47
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default_zoom = 12
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def __init__(self, attrs=None):
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super().__init__()
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for key in ('default_lon', 'default_lat', 'default_zoom'):
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self.attrs[key] = getattr(self, key)
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if attrs:
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self.attrs.update(attrs)
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