/usr/share/common-lisp/source/mcclim/coordinates.lisp is in cl-mcclim 0.9.6.dfsg.cvs20100315-2.
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;;; --------------------------------------------------------------------------------------
;;; Title: The coordinate Datatype
;;; Created: 1998-12-05 18:06
;;; Author: Gilbert Baumann <unk6@rz.uni-karlsruhe.de>
;;; License: LGPL (See file COPYING for details).
;;; $Id: coordinates.lisp,v 1.6 2003/05/31 18:18:43 gilbert Exp $
;;; --------------------------------------------------------------------------------------
;;; (c) copyright 1998,1999,2003 by Gilbert Baumann
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Library General Public
;;; License as published by the Free Software Foundation; either
;;; version 2 of the License, or (at your option) any later version.
;;;
;;; This library 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
;;; Library General Public License for more details.
;;;
;;; You should have received a copy of the GNU Library General Public
;;; License along with this library; if not, write to the
;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;;; Boston, MA 02111-1307 USA.
(in-package :clim-internals)
#||
(deftype coordinate () 'double-float)
(defun coordinate (n)
"Coerces N to be a coordinate."
(declare (type number n))
(coerce n 'coordinate))
(defun coordinate-epsilon ()
;; tweak if you like
(* #.(expt 2 10) double-float-epsilon))
(defun coordinate= (x y)
(< (abs (- x y)) (coordinate-epsilon)))
(defun coordinate<= (x y)
(<= (- x y) (coordinate-epsilon)))
(defun coordinate/= (x y)
(not (coordinate= x y)))
||#
(deftype coordinate () 'real)
(declaim (inline coordinate))
(defun coordinate (n) n)
(declaim (inline coordinate-epsilon))
(defun coordinate-epsilon ()
0)
(declaim (inline coordinate=))
(defun coordinate= (x y)
(= x y))
(declaim (inline coordinate<=))
(defun coordinate<= (x y)
(<= x y))
(declaim (inline coordinate/=))
(defun coordinate/= (x y)
(/= x y))
;; $Log: coordinates.lisp,v $
;; Revision 1.6 2003/05/31 18:18:43 gilbert
;; Took the easy route: I switched COORDINATE to being just REAL in an
;; attempt to keep McCLIM running using the latest CMUCL. This is however
;; a questionable thing as it hides the real type errors.
;;
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