lwgeom_is_closed()

int lwgeom_is_closed ( const LWGEOM *  geom )

extern

Return true or false depending on whether a geometry is a linear feature that closes on itself.

Definition at line 1035 of file lwgeom.c.

{
        int type = geom->type;
 
        if( lwgeom_is_empty(geom) )
                return LW_FALSE;
 
        /* Test linear types for closure */
        switch (type)
        {
        case LINETYPE:
                return lwline_is_closed((LWLINE*)geom);
        case POLYGONTYPE:
                return lwpoly_is_closed((LWPOLY*)geom);
        case CIRCSTRINGTYPE:
                return lwcircstring_is_closed((LWCIRCSTRING*)geom);
        case COMPOUNDTYPE:
                return lwcompound_is_closed((LWCOMPOUND*)geom);
        case TINTYPE:
                return lwtin_is_closed((LWTIN*)geom);
        case POLYHEDRALSURFACETYPE:
                return lwpsurface_is_closed((LWPSURFACE*)geom);
        }
 
        /* Recurse into collections and see if anything is not closed */
        if ( lwgeom_is_collection(geom) )
        {
                LWCOLLECTION *col = lwgeom_as_lwcollection(geom);
                uint32_t i;
                int closed;
                for ( i = 0; i < col->ngeoms; i++ )
                {
                        closed = lwgeom_is_closed(col->geoms[i]);
                        if ( ! closed )
                                return LW_FALSE;
                }
                return LW_TRUE;
        }
 
        /* All non-linear non-collection types we will call closed */
        return LW_TRUE;
}

References CIRCSTRINGTYPE, COMPOUNDTYPE, LWCOLLECTION::geoms, LINETYPE, LW_FALSE, LW_TRUE, lwcircstring_is_closed(), lwcompound_is_closed(), lwgeom_as_lwcollection(), lwgeom_is_closed(), lwgeom_is_collection(), lwgeom_is_empty(), lwline_is_closed(), lwpoly_is_closed(), lwpsurface_is_closed(), lwtin_is_closed(), LWCOLLECTION::ngeoms, POLYGONTYPE, POLYHEDRALSURFACETYPE, TINTYPE, and LWGEOM::type.

Referenced by lwgeom_dimensionality(), lwgeom_is_closed(), and LWGEOM_isclosed().

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