this module is for the miscellaneous geos routines particularly the ones that return the area distance and length argument is a geometry return type is double that is passed in by reference as the last argument ctypes prototypes area distance and length prototypes argument is a geometry return type is double that is passed in by reference as the last argument status code returned ctypes prototypes area distance and length prototypes
from ctypes import POINTER, c_double, c_int

from django.contrib.gis.geos.libgeos import GEOM_PTR, GEOSFuncFactory
from django.contrib.gis.geos.prototypes.errcheck import check_dbl, check_string
from django.contrib.gis.geos.prototypes.geom import geos_char_p

__all__ = ["geos_area", "geos_distance", "geos_length", "geos_isvalidreason"]


class DblFromGeom(GEOSFuncFactory):
    

    restype = c_int  
    errcheck = staticmethod(check_dbl)





geos_area = DblFromGeom("GEOSArea", argtypes=[GEOM_PTR, POINTER(c_double)])
geos_distance = DblFromGeom(
    "GEOSDistance", argtypes=[GEOM_PTR, GEOM_PTR, POINTER(c_double)]
)
geos_length = DblFromGeom("GEOSLength", argtypes=[GEOM_PTR, POINTER(c_double)])
geos_isvalidreason = GEOSFuncFactory(
    "GEOSisValidReason", restype=geos_char_p, errcheck=check_string, argtypes=[GEOM_PTR]
)