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1 | ;;; float-sup.el --- define some constants useful for floating point numbers. |
2 | ||
ab422c4d | 3 | ;; Copyright (C) 1985-1987, 2001-2013 Free Software Foundation, Inc. |
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4 | |
5 | ;; Maintainer: FSF | |
6 | ;; Keywords: internal | |
bd78fa1d | 7 | ;; Package: emacs |
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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 |
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13 | ;; the Free Software Foundation, either version 3 of the License, or |
14 | ;; (at your option) any later version. | |
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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/>. |
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23 | |
24 | ;;; Commentary: | |
25 | ||
26 | ;;; Code: | |
27 | ||
9a0dd02d GM |
28 | ;; Provide an easy hook to tell if we are running with floats or not. |
29 | ;; Define pi and e via math-lib calls (much less prone to killer typos). | |
9e0d4f9e | 30 | (defconst float-pi (* 4 (atan 1)) "The value of Pi (3.1415926...).") |
513749ee SM |
31 | (defconst pi float-pi |
32 | "Obsolete since Emacs-23.3. Use `float-pi' instead.") | |
33 | (internal-make-var-non-special 'pi) | |
8f92ec4d | 34 | |
9e0d4f9e | 35 | (defconst float-e (exp 1) "The value of e (2.7182818...).") |
5e046f6d | 36 | |
9e0d4f9e | 37 | (defconst degrees-to-radians (/ float-pi 180.0) |
5e046f6d | 38 | "Degrees to radian conversion constant.") |
9e0d4f9e | 39 | (defconst radians-to-degrees (/ 180.0 float-pi) |
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40 | "Radian to degree conversion constant.") |
41 | ||
9a0dd02d | 42 | ;; These expand to a single multiply by a float when byte compiled. |
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43 | |
44 | (defmacro degrees-to-radians (x) | |
99368725 | 45 | "Convert X from degrees to radians." |
9e0d4f9e | 46 | (list '* degrees-to-radians x)) |
5e046f6d | 47 | (defmacro radians-to-degrees (x) |
99368725 | 48 | "Convert X from radians to degrees." |
9e0d4f9e | 49 | (list '* radians-to-degrees x)) |
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50 | |
51 | (provide 'lisp-float-type) | |
52 | ||
53 | ;;; float-sup.el ends here |