def __setstate__(self, state):
"""WKB doesn't differentiate between LineString and LinearRing so we
need to move the coordinate sequence into the correct geometry type"""
super(LinearRing, self).__setstate__(state)
cs = lgeos.GEOSGeom_getCoordSeq(self.__geom__)
cs_clone = lgeos.GEOSCoordSeq_clone(cs)
lgeos.GEOSGeom_destroy(self.__geom__)
self.__geom__ = lgeos.GEOSGeom_createLinearRing(cs_clone)
def geos_geom_from_py(ob, create_func=None):
"""Helper function for geos_*_from_py functions in each geom type.
If a create_func is specified the coodinate sequence is cloned and a new
geometry is created with it, otherwise the geometry is cloned directly.
This behaviour is useful for converting between LineString and LinearRing
objects.
"""
if create_func is None:
geom = lgeos.GEOSGeom_clone(ob._geom)
else:
cs = lgeos.GEOSGeom_getCoordSeq(ob._geom)
cs = lgeos.GEOSCoordSeq_clone(cs)
geom = create_func(cs)
N = lgeos.GEOSGeom_getCoordinateDimension(geom)
return geom, N
