FUNCTION base_axis

(* SCHEMA step_merged_ap_schema; *)

-- DIFF IN AP224
-- DIFF IN AP232
FUNCTION base_axis
      (dim : INTEGER;
       axis1 : direction;
       axis2 : direction;
       axis3 : direction ) : LIST [2:3] OF direction;
   LOCAL
      u : LIST [2:3] OF direction;
      factor : REAL;
      d1 : direction;
      d2 : direction;
   END_LOCAL;
      IF dim = 3 THEN
         d1 := NVL(normalise(axis3), dummy_gri || direction([ 0.0, 0.0, 1.0 ]));
         d2 := first_proj_axis(d1, axis1);
         u := [ d2, second_proj_axis(d1, d2, axis2), d1 ];
      ELSE
         IF EXISTS(axis1) THEN
            d1 := normalise(axis1);
            u := [ d1, orthogonal_complement(d1) ];
            IF EXISTS(axis2) THEN
               factor := dot_product(axis2, u[2]);
               IF factor < 0.0 THEN
                  u[2].direction_ratios[1] := -u[2].direction_ratios[1];
                  u[2].direction_ratios[2] := -u[2].direction_ratios[2];
               END_IF;
            END_IF;
         ELSE
            IF EXISTS(axis2) THEN
               d1 := normalise(axis2);
               u := [ orthogonal_complement(d1), d1 ];
               u[1].direction_ratios[1] := -u[1].direction_ratios[1];
               u[1].direction_ratios[2] := -u[1].direction_ratios[2];
            ELSE
               u := [ dummy_gri || direction([ 1.0, 0.0 ]), dummy_gri || direction([ 0.0, 1.0 ]) ];
            END_IF;
         END_IF;
      END_IF;
      RETURN (u);
END_FUNCTION;

Referenced By

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2024-09-06T14:00:33-04:00