lwgeom_dimension()

int lwgeom_dimension

(

const LWGEOM *

geom

)

For an LWGEOM, returns 0 for points, 1 for lines, 2 for polygons, 3 for volume, and the max dimension of a collection.

Definition at line 1241 of file lwgeom.c.

References CIRCSTRINGTYPE, COLLECTIONTYPE, COMPOUNDTYPE, CURVEPOLYTYPE, LWCOLLECTION::geoms, LINETYPE, LWDEBUGF, lwerror(), lwpsurface_is_closed(), lwtype_name(), MULTICURVETYPE, MULTILINETYPE, MULTIPOINTTYPE, MULTIPOLYGONTYPE, MULTISURFACETYPE, LWCOLLECTION::ngeoms, POINTTYPE, POLYGONTYPE, POLYHEDRALSURFACETYPE, TINTYPE, TRIANGLETYPE, and LWGEOM::type.

Referenced by LWGEOM_dimension(), and lwgeom_node().

{

        /* Null? Zero. */
        if( ! geom ) return -1;

        LWDEBUGF(4, "lwgeom_dimension got type %s",
                 lwtype_name(geom->type));

        /* Empty? Zero. */
        /* if( lwgeom_is_empty(geom) ) return 0; */

        switch (geom->type)
        {
        case POINTTYPE:
        case MULTIPOINTTYPE:
                return 0;
        case CIRCSTRINGTYPE:
        case LINETYPE:
        case COMPOUNDTYPE:
        case MULTICURVETYPE:
        case MULTILINETYPE:
                return 1;
        case TRIANGLETYPE:
        case POLYGONTYPE:
        case CURVEPOLYTYPE:
        case MULTISURFACETYPE:
        case MULTIPOLYGONTYPE:
        case TINTYPE:
                return 2;
        case POLYHEDRALSURFACETYPE:
        {
                /* A closed polyhedral surface contains a volume. */
                int closed = lwpsurface_is_closed((LWPSURFACE*)geom);
                return ( closed ? 3 : 2 );
        }
        case COLLECTIONTYPE:
        {
                int maxdim = 0, i;
                LWCOLLECTION *col = (LWCOLLECTION*)geom;
                for( i = 0; i < col->ngeoms; i++ )
                {
                        int dim = lwgeom_dimension(col->geoms[i]);
                        maxdim = ( dim > maxdim ? dim : maxdim );
                }
                return maxdim;
        }
        default:
                lwerror("%s: unsupported input geometry type: %s",
                        __func__, lwtype_name(geom->type));
        }
        return -1;
}

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