120 lines
3.6 KiB
Python
120 lines
3.6 KiB
Python
from __future__ import unicode_literals
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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.geos import GEOSException, GEOSGeometry
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from django.forms.widgets import Widget
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from django.template import loader
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from django.utils import six, 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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Renders 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, self.map_srid)
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except (GEOSException, ValueError) as err:
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logger.error(
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"Error creating geometry from value '%s' (%s)" % (
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value, err)
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)
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return None
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def render(self, name, value, attrs=None):
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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 isinstance(value, six.string_types):
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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 != 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 = self.build_attrs(
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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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)
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return loader.render_to_string(self.template_name, context)
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class OpenLayersWidget(BaseGeometryWidget):
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template_name = 'gis/openlayers.html'
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class Media:
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js = (
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'http://openlayers.org/api/2.13/OpenLayers.js',
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'gis/js/OLMapWidget.js',
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)
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class OSMWidget(BaseGeometryWidget):
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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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class Media:
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js = (
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'http://openlayers.org/api/2.13/OpenLayers.js',
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'http://www.openstreetmap.org/openlayers/OpenStreetMap.js',
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'gis/js/OLMapWidget.js',
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)
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def __init__(self, attrs=None):
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super(OSMWidget, self).__init__()
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for key in ('default_lon', 'default_lat'):
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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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@property
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def map_srid(self):
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# Use the official spherical mercator projection SRID when GDAL is
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# available; otherwise, fallback to 900913.
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if gdal.HAS_GDAL:
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return 3857
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else:
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return 900913
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