| """ |
| 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 GEOM_PTR |
| from django.contrib.gis.geos.prototypes.errcheck import check_predicate |
| from django.contrib.gis.geos.prototypes.threadsafe import GEOSFunc |
| |
| ## 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(GEOSFunc('GEOSHasZ')) |
| geos_isempty = unary_predicate(GEOSFunc('GEOSisEmpty')) |
| geos_isring = unary_predicate(GEOSFunc('GEOSisRing')) |
| geos_issimple = unary_predicate(GEOSFunc('GEOSisSimple')) |
| geos_isvalid = unary_predicate(GEOSFunc('GEOSisValid')) |
| |
| ## Binary Predicates ## |
| geos_contains = binary_predicate(GEOSFunc('GEOSContains')) |
| geos_crosses = binary_predicate(GEOSFunc('GEOSCrosses')) |
| geos_disjoint = binary_predicate(GEOSFunc('GEOSDisjoint')) |
| geos_equals = binary_predicate(GEOSFunc('GEOSEquals')) |
| geos_equalsexact = binary_predicate(GEOSFunc('GEOSEqualsExact'), c_double) |
| geos_intersects = binary_predicate(GEOSFunc('GEOSIntersects')) |
| geos_overlaps = binary_predicate(GEOSFunc('GEOSOverlaps')) |
| geos_relatepattern = binary_predicate(GEOSFunc('GEOSRelatePattern'), c_char_p) |
| geos_touches = binary_predicate(GEOSFunc('GEOSTouches')) |
| geos_within = binary_predicate(GEOSFunc('GEOSWithin')) |
