from django.contrib.gis.geos.geometry import GEOSGeometry, wkt_regex, hex_regex

from django.contrib.gis.geos.point import Point

from django.contrib.gis.geos.linestring import LineString, LinearRing

from django.contrib.gis.geos.polygon import Polygon

from django.contrib.gis.geos.collections import GeometryCollection, MultiPoint, MultiLineString, MultiPolygon

from django.contrib.gis.geos.error import GEOSException, GEOSIndexError

from django.contrib.gis.geos.libgeos import geos_version, geos_version_info, GEOS_PREPARE

def fromfile(file_name):

    """

    Given a string file name, returns a GEOSGeometry. The file may contain WKB,

    WKT, or HEX.

    """

    fh = open(file_name, 'rb')

    buf = fh.read()

    fh.close()

    if wkt_regex.match(buf) or hex_regex.match(buf):

        return GEOSGeometry(buf)

    else:

        return GEOSGeometry(buffer(buf))

def fromstr(wkt_or_hex, **kwargs):

    "Given a string value (wkt or hex), returns a GEOSGeometry object."

    return GEOSGeometry(wkt_or_hex, **kwargs)

def hex_to_wkt(hex):

    "Converts HEXEWKB into WKT."

    return GEOSGeometry(hex).wkt

def wkt_to_hex(wkt):

    "Converts WKT into HEXEWKB."

    return GEOSGeometry(wkt).hex

def centroid(input):

    "Returns the centroid of the geometry (given in HEXEWKB)."

    return GEOSGeometry(input).centroid.wkt

def area(input):

    "Returns the area of the geometry (given in HEXEWKB)."

    return GEOSGeometry(input).area