lwline_simplify()

LWLINE* lwline_simplify	(	const LWLINE *	iline,
		double	dist,
		int	preserve_collapsed
	)

Definition at line 541 of file lwline.c.

References getPoint4d_p(), LW_TRUE, LWDEBUG, lwline_construct(), lwline_is_empty(), POINTARRAY::npoints, LWLINE::points, ptarray_append_point(), ptarray_free(), ptarray_simplify(), LWLINE::srid, and LWLINE::type.

Referenced by lwgeom_simplify().

{
        static const int minvertices = 2; /* TODO: allow setting this */
        LWLINE *oline;
        POINTARRAY *pa;

        LWDEBUG(2, "function called");

        /* Skip empty case */
        if( lwline_is_empty(iline) )
                return NULL;

        pa = ptarray_simplify(iline->points, dist, minvertices);
        if ( ! pa ) return NULL;

        /* Make sure single-point collapses have two points */
        if ( pa->npoints == 1 )
        {
                /* Make sure single-point collapses have two points */
                if ( preserve_collapsed )
                {
                        POINT4D pt;
                        getPoint4d_p(pa, 0, &pt);
                        ptarray_append_point(pa, &pt, LW_TRUE);
                }
                /* Return null for collapse */
                else
                {
                        ptarray_free(pa);
                        return NULL;
                }
        }

        oline = lwline_construct(iline->srid, NULL, pa);
        oline->type = iline->type;
        return oline;
}

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