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1 | ;;; float-sup.el --- define some constants useful for floating point numbers. |
2 | ||
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3 | ;; Copyright (C) 1985, 1986, 1987, 2001, 2002, 2003, 2004, 2005, 2006, |
4 | ;; 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. | |
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5 | |
6 | ;; Maintainer: FSF | |
7 | ;; Keywords: internal | |
bd78fa1d | 8 | ;; Package: emacs |
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9 | |
10 | ;; This file is part of GNU Emacs. | |
11 | ||
d6cba7ae | 12 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
5e046f6d | 13 | ;; it under the terms of the GNU General Public License as published by |
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14 | ;; the Free Software Foundation, either version 3 of the License, or |
15 | ;; (at your option) any later version. | |
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16 | |
17 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
18 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | ;; GNU General Public License for more details. | |
21 | ||
22 | ;; You should have received a copy of the GNU General Public License | |
d6cba7ae | 23 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
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24 | |
25 | ;;; Commentary: | |
26 | ||
27 | ;;; Code: | |
28 | ||
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29 | ;; Provide an easy hook to tell if we are running with floats or not. |
30 | ;; Define pi and e via math-lib calls (much less prone to killer typos). | |
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31 | (defconst float-pi (* 4 (atan 1)) "The value of Pi (3.1415926...).") |
32 | (defconst pi float-pi "Obsolete since Emacs-23.3. Use `float-pi' instead.") | |
8f92ec4d | 33 | |
9e0d4f9e | 34 | (defconst float-e (exp 1) "The value of e (2.7182818...).") |
5e046f6d | 35 | |
9e0d4f9e | 36 | (defconst degrees-to-radians (/ float-pi 180.0) |
5e046f6d | 37 | "Degrees to radian conversion constant.") |
9e0d4f9e | 38 | (defconst radians-to-degrees (/ 180.0 float-pi) |
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39 | "Radian to degree conversion constant.") |
40 | ||
9a0dd02d | 41 | ;; These expand to a single multiply by a float when byte compiled. |
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42 | |
43 | (defmacro degrees-to-radians (x) | |
99368725 | 44 | "Convert X from degrees to radians." |
9e0d4f9e | 45 | (list '* degrees-to-radians x)) |
5e046f6d | 46 | (defmacro radians-to-degrees (x) |
99368725 | 47 | "Convert X from radians to degrees." |
9e0d4f9e | 48 | (list '* radians-to-degrees x)) |
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49 | |
50 | (provide 'lisp-float-type) | |
51 | ||
52 | ;;; float-sup.el ends here |