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(* Copyright (C) 2005-2023 Free Software Foundation, Inc. *)
(* This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GNU Modula-2 is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with gm2; see the file COPYING. If not, write to the Free Software
Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *)
DEFINITION MODULE Geometry ;
(*
Title : Geometry
Author : Gaius Mulley
Date : 20/8/88
LastEdit : 20/8/88
System : LOGITECH MODULA-2/86
Description: Defines some commonly used geometrical functions.
*)
EXPORT QUALIFIED IsSubLine, IsSubRange, IsIntersectingRange,
IntersectionLength, IsPointOnLine,
Abs, Min, Max, Swap ;
(*
IsSubLine - returns true if the range i1..i2 or j1..j2 are ranges
of each other.
*)
PROCEDURE IsSubLine (i1, i2, j1, j2: CARDINAL) : BOOLEAN ;
(*
IsSubRange - returns true if i lies inbetween High and Low.
*)
PROCEDURE IsSubRange (Low, High, i: CARDINAL) : BOOLEAN ;
(*
IsIntersectingRange - returns true if the ranges i1..i2 j1..j2
overlap.
*)
PROCEDURE IsIntersectingRange (i1, i2, j1, j2: CARDINAL) : BOOLEAN ;
(*
IntersectionLength - returns the intersection length
of the overlapping ranges i1..i2 j1..j2.
*)
PROCEDURE IntersectionLength (i1, i2, j1, j2: CARDINAL) : CARDINAL ;
(*
IsPointOnLine - returns true if point x, y is on line (x1, y1) , (x2, y2)
*)
PROCEDURE IsPointOnLine (x, y: CARDINAL; x1, y1, x2, y2: CARDINAL) : BOOLEAN ;
(*
Max - returns the largest cardinal number from i and j.
*)
PROCEDURE Max (i, j: CARDINAL) : CARDINAL ;
(*
Min - returns the smallest cardinal number from i and j.
*)
PROCEDURE Min (i, j: CARDINAL) : CARDINAL ;
(*
Abs - returns the difference between i and j.
*)
PROCEDURE Abs (i, j: CARDINAL) : CARDINAL ;
(*
Swap - swaps two cardinal numbers i and j.
*)
PROCEDURE Swap (VAR i, j: CARDINAL) ;
END Geometry.
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