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1 | ;;; float-sup.el --- define some constants useful for floating point numbers. |
2 | ||
d59c3137 | 3 | ;; Copyright (C) 1985, 1986, 1987, 2001, 2002, 2003, 2004, |
114f9c96 | 4 | ;; 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
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5 | |
6 | ;; Maintainer: FSF | |
7 | ;; Keywords: internal | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
d6cba7ae | 11 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
5e046f6d | 12 | ;; it under the terms of the GNU General Public License as published by |
d6cba7ae GM |
13 | ;; the Free Software Foundation, either version 3 of the License, or |
14 | ;; (at your option) any later version. | |
5e046f6d JB |
15 | |
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
d6cba7ae | 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
5e046f6d JB |
23 | |
24 | ;;; Commentary: | |
25 | ||
26 | ;;; Code: | |
27 | ||
28 | ;; Provide a meaningful error message if we are running on | |
29 | ;; bare (non-float) emacs. | |
30 | ||
31 | (if (fboundp 'atan) | |
32 | nil | |
33 | (error "Floating point was disabled at compile time")) | |
34 | ||
35 | ;; provide an easy hook to tell if we are running with floats or not. | |
36 | ;; define pi and e via math-lib calls. (much less prone to killer typos.) | |
9e0d4f9e SM |
37 | (defconst float-pi (* 4 (atan 1)) "The value of Pi (3.1415926...).") |
38 | (defconst pi float-pi "Obsolete since Emacs-23.3. Use `float-pi' instead.") | |
8f92ec4d | 39 | |
9e0d4f9e SM |
40 | (defconst float-e (exp 1) "The value of e (2.7182818...).") |
41 | (defvar e float-e "Obsolete since Emacs-23.3. Use `float-e' instead.") | |
5e046f6d | 42 | |
9e0d4f9e | 43 | (defconst degrees-to-radians (/ float-pi 180.0) |
5e046f6d | 44 | "Degrees to radian conversion constant.") |
9e0d4f9e | 45 | (defconst radians-to-degrees (/ 180.0 float-pi) |
5e046f6d JB |
46 | "Radian to degree conversion constant.") |
47 | ||
48 | ;; these expand to a single multiply by a float when byte compiled | |
49 | ||
50 | (defmacro degrees-to-radians (x) | |
51 | "Convert ARG from degrees to radians." | |
9e0d4f9e | 52 | (list '* degrees-to-radians x)) |
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53 | (defmacro radians-to-degrees (x) |
54 | "Convert ARG from radians to degrees." | |
9e0d4f9e | 55 | (list '* radians-to-degrees x)) |
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56 | |
57 | (provide 'lisp-float-type) | |
58 | ||
cbee283d | 59 | ;; arch-tag: e7837072-a4af-4d08-9953-8a3e755abf9d |
5e046f6d | 60 | ;;; float-sup.el ends here |