def render(self, name, value, attrs=None):
        # Update the template parameters with any attributes passed in.
        if attrs: self.params.update(attrs)

        # Defaulting the WKT value to a blank string -- this
        # will be tested in the JavaScript and the appropriate
        # interface will be constructed.
        self.params['wkt'] = ''

        # If a string reaches here (via a validation error on another
        # field) then just reconstruct the Geometry.
        if isinstance(value, basestring):
            try:
                value = GEOSGeometry(value)
            except (GEOSException, __HOLE__):
                value = None

        if value and value.geom_type.upper() != self.geom_type:
            value = None

        # Constructing the dictionary of the map options.
        self.params['map_options'] = self.map_options()

        # Constructing the JavaScript module name using the name of
        # the GeometryField (passed in via the `attrs` keyword).
        # Use the 'name' attr for the field name (rather than 'field')
        self.params['name'] = name
        # note: we must switch out dashes for underscores since js
        # functions are created using the module variable
        js_safe_name = self.params['name'].replace('-','_')
        self.params['module'] = 'geodjango_%s' % js_safe_name

        if value:
            # Transforming the geometry to the projection used on the
            # OpenLayers map.
            srid = self.params['srid']
            if value.srid != srid:
                try:
                    ogr = value.ogr
                    ogr.transform(srid)
                    wkt = ogr.wkt
                except OGRException:
                    wkt = ''
            else:
                wkt = value.wkt

            # Setting the parameter WKT with that of the transformed
            # geometry.
            self.params['wkt'] = wkt

        return loader.render_to_string(self.template, self.params,
                                       context_instance=geo_context)
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/contrib/gis/admin/widgets.py/OpenLayersWidget.render