Copyright (C) 1994, Digital Equipment Corp. INTERFACEAxis ; IMPORT Word;
Axis.T.Hor and Axis.T.Ver are Trestle's names for the horizontal
and vertical axes. Axis.Other exchanges Hor and Ver.
Index: screen, coordinate system
TYPE T = {Hor, Ver};
CONST Other = ARRAY T OF T {T.Ver, T.Hor};
PROCEDURE Compare (a, b: T): [-1 .. 1];
== RETURN (a - b)
PROCEDURE Equal (a, b: T): BOOLEAN;
== RETURN (a = b)
PROCEDURE Hash (a: T): Word.T;
== RETURN ORD (a)
END Axis.