lwgeom_offsetcurve()

LWGEOM* lwgeom_offsetcurve	(	const LWGEOM *	geom,
		double	size,
		int	quadsegs,
		int	joinStyle,
		double	mitreLimit
	)

Definition at line 1446 of file liblwgeom/lwgeom_geos.c.

{
        int32_t srid = RESULT_SRID(geom);
        LWGEOM *result = NULL;
        LWGEOM *noded = NULL;
        if (srid == SRID_INVALID) return NULL;
 
        if (lwgeom_dimension(geom) != 1)
        {
                lwerror("%s: input is not linear", __func__, lwtype_name(geom->type));
                return NULL;
        }
 
        while (!result)
        {
                switch (geom->type)
                {
                case LINETYPE:
                        result = lwline_offsetcurve(lwgeom_as_lwline(geom), size, quadsegs, joinStyle, mitreLimit);
                        break;
                case COLLECTIONTYPE:
                case MULTILINETYPE:
                        result = lwcollection_offsetcurve(lwgeom_as_lwcollection(geom), size, quadsegs, joinStyle, mitreLimit);
                        break;
                default:
                        lwerror("%s: unsupported geometry type: %s", __func__, lwtype_name(geom->type));
                        return NULL;
                }
 
                if (result)
                {
                        if (noded) lwgeom_free(noded);
                        return result;
                }
                else if (!noded)
                {
                        noded = lwgeom_node(geom);
                        if (!noded)
                        {
                                lwerror("lwgeom_offsetcurve: cannot node input");
                                return NULL;
                        }
                        geom = noded;
                }
                else
                {
                        lwgeom_free(noded);
                        lwerror("lwgeom_offsetcurve: noded geometry cannot be offset");
                        return NULL;
                }
        }
 
        return result;
}

References COLLECTIONTYPE, LINETYPE, lwcollection_offsetcurve(), lwerror(), lwgeom_as_lwcollection(), lwgeom_as_lwline(), lwgeom_dimension(), lwgeom_free(), lwgeom_node(), lwline_offsetcurve(), lwtype_name(), MULTILINETYPE, RESULT_SRID, SRID_INVALID, and LWGEOM::type.

Referenced by lwcollection_offsetcurve(), lwgeom_clip_to_ordinate_range(), ST_OffsetCurve(), test_geos_offsetcurve(), and test_geos_offsetcurve_crash().

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