| """ |
| This module houses the GEOS ctypes prototype functions for the |
| unary and binary predicate operations on geometries. |
| """ |
| from ctypes import c_char, c_char_p, c_double |
| from django.contrib.gis.geos.libgeos import lgeos, GEOM_PTR |
| from django.contrib.gis.geos.prototypes.errcheck import check_predicate |
| |
| ## Binary & unary predicate functions ## |
| def binary_predicate(func, *args): |
| "For GEOS binary predicate functions." |
| argtypes = [GEOM_PTR, GEOM_PTR] |
| if args: argtypes += args |
| func.argtypes = argtypes |
| func.restype = c_char |
| func.errcheck = check_predicate |
| return func |
| |
| def unary_predicate(func): |
| "For GEOS unary predicate functions." |
| func.argtypes = [GEOM_PTR] |
| func.restype = c_char |
| func.errcheck = check_predicate |
| return func |
| |
| ## Unary Predicates ## |
| geos_hasz = unary_predicate(lgeos.GEOSHasZ) |
| geos_isempty = unary_predicate(lgeos.GEOSisEmpty) |
| geos_isring = unary_predicate(lgeos.GEOSisRing) |
| geos_issimple = unary_predicate(lgeos.GEOSisSimple) |
| geos_isvalid = unary_predicate(lgeos.GEOSisValid) |
| |
| ## Binary Predicates ## |
| geos_contains = binary_predicate(lgeos.GEOSContains) |
| geos_crosses = binary_predicate(lgeos.GEOSCrosses) |
| geos_disjoint = binary_predicate(lgeos.GEOSDisjoint) |
| geos_equals = binary_predicate(lgeos.GEOSEquals) |
| geos_equalsexact = binary_predicate(lgeos.GEOSEqualsExact, c_double) |
| geos_intersects = binary_predicate(lgeos.GEOSIntersects) |
| geos_overlaps = binary_predicate(lgeos.GEOSOverlaps) |
| geos_relatepattern = binary_predicate(lgeos.GEOSRelatePattern, c_char_p) |
| geos_touches = binary_predicate(lgeos.GEOSTouches) |
| geos_within = binary_predicate(lgeos.GEOSWithin) |
