lwpoly_add_ring()

int lwpoly_add_ring	(	LWPOLY *	poly,
		POINTARRAY *	pa
	)

Add a ring to a polygon.

Add a ring, allocating extra space if necessary.

Point array will be referenced, not copied.

Definition at line 247 of file lwpoly.c.

{
        if( ! poly || ! pa )
                return LW_FAILURE;
 
        /* We have used up our storage, add some more. */
        if( poly->nrings >= poly->maxrings )
        {
                int new_maxrings = 2 * (poly->nrings + 1);
                poly->rings = lwrealloc(poly->rings, new_maxrings * sizeof(POINTARRAY*));
                poly->maxrings = new_maxrings;
        }
 
        /* Add the new ring entry. */
        poly->rings[poly->nrings] = pa;
        poly->nrings++;
 
        return LW_SUCCESS;
}

References LW_FAILURE, LW_SUCCESS, lwrealloc(), LWPOLY::maxrings, LWPOLY::nrings, and LWPOLY::rings.

Referenced by GeneratePolygonGeometry(), geography_centroid_from_mpoly(), lwgeom_segmentize_sphere(), lwpoly_chaikin(), lwpoly_construct_circle(), lwpoly_construct_rectangle(), lwpoly_filterm(), lwpoly_from_twkb_state(), lwpoly_from_wkb_state(), lwpoly_set_effective_area(), parse_geojson_multipolygon(), and wkt_parser_polygon_add_ring().

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