;; Basic editing commands for Emacs ;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc. ;; This file is part of GNU Emacs. ;; GNU Emacs 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 1, or (at your option) ;; any later version. ;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. ;; Provide a meaningful error message if we are running on ;; bare (non-float) emacs. ;; Can't test for 'floatp since that may be defined by float-imitation ;; packages like float.el in this very directory. (if (fboundp 'atan) nil (error (gettext "Floating point was disabled at compile time"))) ;; provide an easy hook to tell if we are running with floats or not. (provide 'lisp-float-type) ;; define pi and e via math-lib calls. (much less prone to killer typos.) (defconst pi (purecopy (* 4 (atan 1))) "The value of Pi (3.1415926...)") (defconst e (purecopy (exp 1)) "The value of e (2.7182818...)") ;; Careful when editing this file ... typos here will be hard to spot. ;; (defconst pi 3.14159265358979323846264338327 ;; "The value of Pi (3.14159265358979323846264338327...)") (defconst degrees-to-radians (purecopy (/ pi 180.0)) "Degrees to radian conversion constant") (defconst radians-to-degrees (purecopy (/ 180.0 pi)) "Radian to degree conversion constant") ;; these expand to a single multiply by a float ;; when byte compiled (defmacro degrees-to-radians (x) "Convert ARG from degrees to radians." (list '* (/ pi 180.0) x)) (defmacro radians-to-degrees (x) "Convert ARG from radians to degrees." (list '* (/ 180.0 pi) x))