lwgeom_pointonsurface()

LWGEOM* lwgeom_pointonsurface

(

const LWGEOM *

geom

)

Definition at line 871 of file liblwgeom/lwgeom_geos.c.

{
        LWGEOM *result;
        int32_t srid = RESULT_SRID(geom);
        uint8_t is3d = FLAGS_GET_Z(geom->flags);
        GEOSGeometry *g1, *g3;
 
        if (srid == SRID_INVALID) return NULL;
 
        if (lwgeom_is_empty(geom))
        {
                LWPOINT *lwp = lwpoint_construct_empty(srid, is3d, lwgeom_has_m(geom));
                return lwpoint_as_lwgeom(lwp);
        }
 
        initGEOS(lwnotice, lwgeom_geos_error);
 
        if (!(g1 = LWGEOM2GEOS(geom, AUTOFIX))) GEOS_FAIL();
 
        g3 = GEOSPointOnSurface(g1);
 
        if (!g3) GEOS_FREE_AND_FAIL(g1);
        GEOSSetSRID(g3, srid);
 
        if (!(result = GEOS2LWGEOM(g3, is3d)))
                GEOS_FREE_AND_FAIL(g1, g3);
 
        GEOS_FREE(g1, g3);
 
        return result;
}

References AUTOFIX, LWGEOM::flags, FLAGS_GET_Z, GEOS2LWGEOM(), GEOS_FAIL, GEOS_FREE, GEOS_FREE_AND_FAIL, LWGEOM2GEOS(), lwgeom_geos_error(), lwgeom_has_m(), lwgeom_is_empty(), lwnotice(), lwpoint_as_lwgeom(), lwpoint_construct_empty(), RESULT_SRID, and SRID_INVALID.

Referenced by pointonsurface().

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