lwgeom_force_clockwise()

void lwgeom_force_clockwise

(

LWGEOM *

lwgeom

)

Force Right-hand-rule on LWGEOM polygons.

Ensure the outer ring is clockwise oriented and all inner rings are counter-clockwise.

Definition at line 36 of file lwgeom.c.

References COLLECTIONTYPE, LWCOLLECTION::geoms, lwpoly_force_clockwise(), lwtriangle_force_clockwise(), MULTIPOLYGONTYPE, LWCOLLECTION::ngeoms, POLYGONTYPE, TRIANGLETYPE, and LWGEOM::type.

Referenced by LWGEOM_force_clockwise_poly(), mvt_geom(), and test_lwgeom_force_clockwise().

{
        LWCOLLECTION *coll;
        int i;

        switch (lwgeom->type)
        {
        case POLYGONTYPE:
                lwpoly_force_clockwise((LWPOLY *)lwgeom);
                return;

        case TRIANGLETYPE:
                lwtriangle_force_clockwise((LWTRIANGLE *)lwgeom);
                return;

                /* Not handle POLYHEDRALSURFACE and TIN
                   as they are supposed to be well oriented */
        case MULTIPOLYGONTYPE:
        case COLLECTIONTYPE:
                coll = (LWCOLLECTION *)lwgeom;
                for (i=0; i<coll->ngeoms; i++)
                        lwgeom_force_clockwise(coll->geoms[i]);
                return;
        }
}

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