FUNCTION dimension_of

(* SCHEMA Ap242_managed_model_based_3d_engineering_mim_LF; *)

FUNCTION dimension_of(item : geometric_representation_item) :
  dimension_count;
  LOCAL
    x   : SET OF representation;
    y   : representation_context;
    dim : dimension_count;
  END_LOCAL;
  -- For cartesian_point, direction, or vector dimension is determined by
  -- counting components.
    IF 'AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.CARTESIAN_POINT' IN TYPEOF(item) THEN
       dim := SIZEOF(item\cartesian_point.coordinates);
       RETURN(dim);
    END_IF;
    IF 'AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.DIRECTION' IN TYPEOF(item) THEN
       dim := SIZEOF(item\direction.direction_ratios);
       RETURN(dim);
    END_IF;
    IF 'AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF.VECTOR' IN TYPEOF(item) THEN
       dim := SIZEOF(item\vector.orientation\direction.direction_ratios);
       RETURN(dim);
    END_IF;
  -- For all other types of geometric_representation_item dim is obtained
  -- via context.
  -- Find the set of representation in which the item is used. 

  x := using_representations(item);

  -- Determines the dimension_count of the 
  -- geometric_representation_context. Note that the 
  -- RULE compatible_dimension ensures that the context_of_items
  -- is of type geometric_representation_context and has
  -- the same dimension_count for all values of x.
  -- The SET x is non-empty for legal instances since this is required by WR1 of
  -- representation_item.
    IF (SIZEOF(x) > 0) THEN
       y := x[1].context_of_items;
      dim := y\geometric_representation_context.coordinate_space_dimension;
    RETURN (dim);
    ELSE
      RETURN(?);
    -- mark error by returning indeterminate result
   END_IF;
   

END_FUNCTION;

Referenced By

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2012-03-27T17:20:10-04:00