lwgeom_startpoint()

int lwgeom_startpoint	(	const LWGEOM *	lwgeom,
		POINT4D *	pt
	)

Definition at line 2141 of file lwgeom.c.

{
        if ( ! lwgeom || lwgeom_is_empty(lwgeom) )
                return LW_FAILURE;
 
        switch( lwgeom->type )
        {
                case POINTTYPE:
                        return ptarray_startpoint(((LWPOINT*)lwgeom)->point, pt);
                case TRIANGLETYPE:
                case CIRCSTRINGTYPE:
                case LINETYPE:
                        return ptarray_startpoint(((LWLINE*)lwgeom)->points, pt);
                case POLYGONTYPE:
                        return lwpoly_startpoint((LWPOLY*)lwgeom, pt);
                case TINTYPE:
                case CURVEPOLYTYPE:
                case COMPOUNDTYPE:
                case MULTIPOINTTYPE:
                case MULTILINETYPE:
                case MULTIPOLYGONTYPE:
                case COLLECTIONTYPE:
                case POLYHEDRALSURFACETYPE:
                        return lwcollection_startpoint((LWCOLLECTION*)lwgeom, pt);
                default:
                        lwerror("lwgeom_startpoint: unsupported geometry type: %s", lwtype_name(lwgeom->type));
                        return LW_FAILURE;
        }
}

References CIRCSTRINGTYPE, COLLECTIONTYPE, COMPOUNDTYPE, CURVEPOLYTYPE, LINETYPE, LW_FAILURE, lwcollection_startpoint(), lwerror(), lwgeom_is_empty(), lwpoly_startpoint(), lwtype_name(), MULTILINETYPE, MULTIPOINTTYPE, MULTIPOLYGONTYPE, POINTTYPE, POLYGONTYPE, POLYHEDRALSURFACETYPE, ptarray_startpoint(), TINTYPE, TRIANGLETYPE, LWGEOM::type, and LWPOINT::type.

Referenced by geography_distance_cache_tolerance(), geography_tree_distance(), lwcollection_startpoint(), lwgeom_solid_contains_lwgeom(), LWGEOM_startpoint_linestring(), and test_misc_startpoint().

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