lwcompound_get_lwpoint()

LWPOINT* lwcompound_get_lwpoint	(	const LWCOMPOUND *	lwcmp,
		int	where
	)

Definition at line 213 of file lwcompound.c.

References genraster::count, lwerror(), lwgeom_count_vertices(), lwgeom_is_empty(), and lwline_get_lwpoint().

Referenced by lwcompound_get_startpoint(), and LWGEOM_pointn_linestring().

{
        int i;
        int count = 0;
        int npoints = 0;
        if ( lwgeom_is_empty((LWGEOM*)lwcmp) )
                return NULL;

        npoints = lwgeom_count_vertices((LWGEOM*)lwcmp);
        if ( where < 0 || where >= npoints )
        {
                lwerror("%s: index %d is not in range of number of vertices (%d) in input", __func__, where, npoints);
                return NULL;
        }

        for ( i = 0; i < lwcmp->ngeoms; i++ )
        {
                LWGEOM* part = lwcmp->geoms[i];
                int npoints_part = lwgeom_count_vertices(part);
                if ( where >= count && where < count + npoints_part )
                {
                        return lwline_get_lwpoint((LWLINE*)part, where - count);
                }
                else
                {
                        count += npoints_part;
                }
        }

        return NULL;
}

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