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Viewing changes to trunk/python-packages/django/contrib/gis/geos/prototypes/predicates.py

  • Committer: Matthew Nuzum
  • Date: 2008-11-13 05:46:03 UTC
  • Revision ID: matthew.nuzum@canonical.com-20081113054603-v0kvr6z6xyexvqt3
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trunk/python-packages/django/contrib/gis/geos/prototypes/predicates.py
 
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"""
 
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 This module houses the GEOS ctypes prototype functions for the 
 
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 unary and binary predicate operations on geometries.
 
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"""
 
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from ctypes import c_char, c_char_p, c_double
 
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from django.contrib.gis.geos.libgeos import lgeos, GEOM_PTR
 
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from django.contrib.gis.geos.prototypes.errcheck import check_predicate
 
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## Binary & unary predicate functions ##
 
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def binary_predicate(func, *args):
 
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    "For GEOS binary predicate functions."
 
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    argtypes = [GEOM_PTR, GEOM_PTR]
 
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    if args: argtypes += args
 
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    func.argtypes = argtypes
 
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    func.restype = c_char
 
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    func.errcheck = check_predicate
 
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    return func
 
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def unary_predicate(func):
 
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    "For GEOS unary predicate functions."
 
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    func.argtypes = [GEOM_PTR]
 
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    func.restype = c_char
 
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    func.errcheck = check_predicate
 
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    return func
 
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## Unary Predicates ##
 
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geos_hasz = unary_predicate(lgeos.GEOSHasZ)
 
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geos_isempty = unary_predicate(lgeos.GEOSisEmpty)
 
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geos_isring = unary_predicate(lgeos.GEOSisRing)
 
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geos_issimple = unary_predicate(lgeos.GEOSisSimple)
 
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geos_isvalid = unary_predicate(lgeos.GEOSisValid)
 
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## Binary Predicates ##
 
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geos_contains = binary_predicate(lgeos.GEOSContains)
 
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geos_crosses = binary_predicate(lgeos.GEOSCrosses)
 
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geos_disjoint = binary_predicate(lgeos.GEOSDisjoint)
 
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geos_equals = binary_predicate(lgeos.GEOSEquals)
 
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geos_equalsexact = binary_predicate(lgeos.GEOSEqualsExact, c_double)
 
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geos_intersects = binary_predicate(lgeos.GEOSIntersects)
 
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geos_overlaps = binary_predicate(lgeos.GEOSOverlaps)
 
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geos_relatepattern = binary_predicate(lgeos.GEOSRelatePattern, c_char_p)
 
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geos_touches = binary_predicate(lgeos.GEOSTouches)
 
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geos_within = binary_predicate(lgeos.GEOSWithin)