def _areas_polygon(request, format, areas, srid=None):
args = query_args_polygon(request, format, srid)
serialiser = GeometrySerialiser(list(areas), args['srid'], args['simplify_tolerance'])
try:
if format == 'kml':
output, content_type = serialiser.kml('full')
elif format == 'geojson':
output, content_type = serialiser.geojson()
except TransformError as e:
return output_json({'error': e.args[0]}, code=400)
return output_polygon(content_type, output)
def _areas_polygon(request, format, areas, srid=None):
args = query_args_polygon(request, format, srid)
serialiser = GeometrySerialiser(list(areas), args['srid'],
args['simplify_tolerance'])
try:
if format == 'kml':
output, content_type = serialiser.kml('full')
elif format == 'geojson':
output, content_type = serialiser.geojson()
except TransformError as e:
return output_json({'error': e.args[0]}, code=400)
return output_polygon(content_type, output)
def areas_polygon(request, area_ids, srid='', format='kml'):
area_ids = area_ids.split(',')
args = query_args_polygon(request, format, srid, area_ids)
areas = list(Area.objects.filter(id__in=area_ids))
if not areas:
return output_json({'error': _('No areas found')}, code=404)
serialiser = GeometrySerialiser(areas, args['srid'], args['simplify_tolerance'])
try:
if format == 'kml':
output, content_type = serialiser.kml('full')
elif format == 'geojson':
output, content_type = serialiser.geojson()
except TransformError as e:
return output_json({'error': e.args[0]}, code=400)
return output_polygon(content_type, output)
def areas_polygon(request, area_ids, srid='', format='kml'):
area_ids = area_ids.split(',')
args = query_args_polygon(request, format, srid, area_ids)
areas = list(Area.objects.filter(id__in=area_ids))
if not areas:
return output_json({'error': _('No areas found')}, code=404)
serialiser = GeometrySerialiser(areas, args['srid'], args['simplify_tolerance'])
try:
if format == 'kml':
output, content_type = serialiser.kml('full')
elif format == 'geojson':
output, content_type = serialiser.geojson()
except TransformError as e:
return output_json({'error': e.args[0]}, code=400)
return output_polygon(content_type, output)
def export(self,
srid,
export_format,
simplify_tolerance=0,
line_colour="70ff0000",
fill_colour="3dff5500",
kml_type="full"):
"""Generate a representation of the area in KML, GeoJSON or WKT
This returns a tuple of (data, content_type), which are
strings representing the data itself and its MIME type. If
there are no polygons associated with this area (None, None)
is returned. 'export_format' may be one of 'kml', 'wkt,
'json' and 'geojson', the last two being synonymous. The
'srid' parameter specifies the coordinate system that the
polygons should be transformed into before being exported, if
it is different from this MapIt. simplify_tolerance, if
non-zero, is passed to
django.contrib.gis.geos.GEOSGeometry.simplify for simplifying
the polygon boundary before export. The line_colour and
fill_colour parameters are only used if the export type is KML
and kml_type is 'full'. The 'kml_type' parameter may be
either 'full' (in which case a complete, valid KML file is
returned) or 'polygon' (in which case just the <Polygon>
element is returned).
If the simplify_tolerance provided is large enough that all
the polygons completely disappear under simplification, or
something else goes wrong with the spatial transform, then a
TransformError exception is raised.
"""
all_polygons = self.polygons.all()
if len(all_polygons) == 0:
return (None, None)
serialiser = GeometrySerialiser(self, srid, simplify_tolerance)
if export_format == 'kml':
out, content_type = serialiser.kml(kml_type, line_colour,
fill_colour)
elif export_format in ('json', 'geojson'):
out, content_type = serialiser.geojson()
elif export_format == 'wkt':
out, content_type = serialiser.wkt()
return (out, content_type)
def export(self,
srid,
export_format,
simplify_tolerance=0,
line_colour="70ff0000",
fill_colour="3dff5500",
kml_type="full"):
"""Generate a representation of the area in KML, GeoJSON or WKT
This returns a tuple of (data, content_type), which are
strings representing the data itself and its MIME type. If
there are no polygons associated with this area (None, None)
is returned. 'export_format' may be one of 'kml', 'wkt,
'json' and 'geojson', the last two being synonymous. The
'srid' parameter specifies the coordinate system that the
polygons should be transformed into before being exported, if
it is different from this MapIt. simplify_tolerance, if
non-zero, is passed to
django.contrib.gis.geos.GEOSGeometry.simplify for simplifying
the polygon boundary before export. The line_colour and
fill_colour parameters are only used if the export type is KML
and kml_type is 'full'. The 'kml_type' parameter may be
either 'full' (in which case a complete, valid KML file is
returned) or 'polygon' (in which case just the <Polygon>
element is returned).
If the simplify_tolerance provided is large enough that all
the polygons completely disappear under simplification, or
something else goes wrong with the spatial transform, then a
TransformError exception is raised.
"""
all_polygons = self.polygons.all()
if len(all_polygons) == 0:
return (None, None)
serialiser = GeometrySerialiser(self, srid, simplify_tolerance)
if export_format == 'kml':
out, content_type = serialiser.kml(kml_type, line_colour, fill_colour)
elif export_format in ('json', 'geojson'):
out, content_type = serialiser.geojson()
elif export_format == 'wkt':
out, content_type = serialiser.wkt()
return (out, content_type)
