lwgeom_force_orientation()

static void lwgeom_force_orientation ( LWGEOM *  lwgeom, int  orientation  )

static

Force an orientation onto geometries made up of rings, so the rings circle in a particular direction, clockwise or counter-clockwise.

The orientation is one of LW_CLOCKWISE or LW_COUNTERCLOCKWISE. Non-polygonal geometries are ignored and returned untouched.

Definition at line 45 of file lwgeom.c.

{
        switch (lwgeom->type)
        {
                case POLYGONTYPE:
                        lwpoly_force_orientation(lwgeom_as_lwpoly(lwgeom), orientation);
                        return;
 
                case TRIANGLETYPE:
                        lwtriangle_force_orientation(lwgeom_as_lwtriangle(lwgeom), orientation);
                        return;
 
                /* Not handle POLYHEDRALSURFACE and TIN
                   as they are supposed to be well oriented */
                case MULTIPOLYGONTYPE:
                case COLLECTIONTYPE:
                {
                        LWCOLLECTION* coll = lwgeom_as_lwcollection(lwgeom);
                        for (uint32_t i = 0; coll && i < coll->ngeoms; i++)
                        {
                                lwgeom_force_orientation(coll->geoms[i], orientation);
                        }
                        return;
                }
        }
}

References COLLECTIONTYPE, LWCOLLECTION::geoms, lwgeom_as_lwcollection(), lwgeom_as_lwpoly(), lwgeom_as_lwtriangle(), lwpoly_force_orientation(), lwtriangle_force_orientation(), MULTIPOLYGONTYPE, LWCOLLECTION::ngeoms, POLYGONTYPE, TRIANGLETYPE, and LWGEOM::type.

Referenced by lwgeom_force_clockwise(), and lwgeom_force_counterclockwise().

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