getPoint4d_cp()

const POINT4D* getPoint4d_cp	(	const POINTARRAY *	pa,
		int	n
	)

Returns a POINT4D pointer into the POINTARRAY serialized_ptlist, suitable for reading from.

This is very high performance and declared const because you aren't allowed to muck with the values, only read them.

Definition at line 408 of file lwgeom_api.c.

References POINTARRAY::flags, FLAGS_GET_Z, getPoint_internal(), lwerror(), and POINTARRAY::npoints.

{
        if ( ! pa ) return 0;

        if ( ! (FLAGS_GET_Z(pa->flags) && FLAGS_GET_Z(pa->flags)) )
        {
                lwerror("getPoint3dz_cp: no Z and M coordinates in point array");
                return 0; /*error */
        }

        if ( (n<0) || (n>=pa->npoints))
        {
                lwerror("getPoint3dz_cp: point offset out of range");
                return 0; /*error */
        }

        return (const POINT4D*)getPoint_internal(pa, n);
}

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