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1 ;;; float-sup.el --- detect absence of floating-point support in XEmacs runtime
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2
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3 ;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: internal
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: FSF 19.30.
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25
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26 ;; Provide a meaningful error message if we are running on
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27 ;; bare (non-float) emacs.
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28 ;; Can't test for 'floatp since that may be defined by float-imitation
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29 ;; packages like float.el in this very directory.
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30
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31 (or (featurep 'lisp-float-type)
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32 (error "Floating point was disabled at compile time"))
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33
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34 ;; define pi and e via math-lib calls. (much less prone to killer typos.)
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35 (defconst pi (purecopy (* 4 (atan 1))) "The value of Pi (3.1415926...)")
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36 (defconst e (purecopy (exp 1)) "The value of e (2.7182818...)")
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37
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38 ;; Careful when editing this file ... typos here will be hard to spot.
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39 ;; (defconst pi 3.14159265358979323846264338327
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40 ;; "The value of Pi (3.14159265358979323846264338327...)")
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41
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42 (defconst degrees-to-radians (purecopy (/ pi 180.0))
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43 "Degrees to radian conversion constant")
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44 (defconst radians-to-degrees (purecopy (/ 180.0 pi))
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45 "Radian to degree conversion constant")
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46
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47 ;; these expand to a single multiply by a float
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48 ;; when byte compiled
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49
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50 (defmacro degrees-to-radians (x)
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51 "Convert ARG from degrees to radians."
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52 (list '* (/ pi 180.0) x))
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53 (defmacro radians-to-degrees (x)
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54 "Convert ARG from radians to degrees."
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55 (list '* (/ 180.0 pi) x))
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56
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57 ;;; float-sup.el ends here
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