lwgeom_offsetcurve()

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

Definition at line 1636 of file liblwgeom/lwgeom_geos.c.

References GEOS2LWGEOM(), LWDEBUGF, lwerror(), LWGEOM2GEOS(), lwgeom_geos_errmsg, lwgeom_geos_error(), lwgeom_get_srid(), lwgeom_has_z(), lwline_as_lwgeom(), and lwnotice().

Referenced by lwgeom_clip_to_ordinate_range(), and ST_OffsetCurve().

{
        GEOSGeometry *g1, *g3;
        LWGEOM *lwgeom_result;
        LWGEOM *lwgeom_in = lwline_as_lwgeom(lwline);

        initGEOS(lwnotice, lwgeom_geos_error);

        g1 = (GEOSGeometry *)LWGEOM2GEOS(lwgeom_in, 0);
        if ( ! g1 )
        {
                lwerror("lwgeom_offsetcurve: Geometry could not be converted to GEOS: %s", lwgeom_geos_errmsg);
                return NULL;
        }

        g3 = GEOSOffsetCurve(g1, size, quadsegs, joinStyle, mitreLimit);

        /* Don't need input geometry anymore */
        GEOSGeom_destroy(g1);

        if (g3 == NULL)
        {
                lwerror("GEOSOffsetCurve: %s", lwgeom_geos_errmsg);
                return NULL;
        }

        LWDEBUGF(3, "result: %s", GEOSGeomToWKT(g3));

        GEOSSetSRID(g3, lwgeom_get_srid(lwgeom_in));
        lwgeom_result = GEOS2LWGEOM(g3, lwgeom_has_z(lwgeom_in));
        GEOSGeom_destroy(g3);

        if (lwgeom_result == NULL)
        {
                lwerror("lwgeom_offsetcurve: GEOS2LWGEOM returned null");
                return NULL;
        }

        return lwgeom_result;
}

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