1 ;; Basic editing commands for Emacs
2 ;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
4 ;; This file is part of GNU Emacs.
6 ;; GNU Emacs is free software; you can redistribute it and/or modify
7 ;; it under the terms of the GNU General Public License as published by
8 ;; the Free Software Foundation; either version 1, or (at your option)
11 ;; GNU Emacs is distributed in the hope that it will be useful,
12 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ;; GNU General Public License for more details.
16 ;; You should have received a copy of the GNU General Public License
17 ;; along with GNU Emacs; see the file COPYING. If not, write to
18 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
20 ;; Provide a meaningful error message if we are running on
21 ;; bare (non-float) emacs.
22 ;; Can't test for 'floatp since that may be defined by float-imitation
23 ;; packages like float.el in this very directory.
27 (error "Floating point was disabled at compile time"))
29 ;; provide an easy hook to tell if we are running with floats or not.
30 (provide 'lisp-float-type
)
32 ;; define pi and e via math-lib calls. (much less prone to killer typos.)
33 (defconst pi
(* 4 (atan 1)) "The value of Pi (3.1415926...)")
34 (defconst e
(exp 1) "The value of e (2.7182818...)")
36 ;; Careful when editing this file ... typos here will be hard to spot.
37 ;; (defconst pi 3.14159265358979323846264338327
38 ;; "The value of Pi (3.14159265358979323846264338327...)")
40 (defconst degrees-to-radians
(/ pi
180.0)
41 "Degrees to radian conversion constant")
42 (defconst radians-to-degrees
(/ 180.0 pi
)
43 "Radian to degree conversion constant")
45 ;; these expand to a single multiply by a float
48 (defmacro degrees-to-radians
(x)
49 "Convert ARG from degrees to radians."
50 (list '* (/ pi
180.0) x
))
51 (defmacro radians-to-degrees
(x)
52 "Convert ARG from radians to degrees."
53 (list '* (/ 180.0 pi
) x
))