##
## "VIEW", a data viewing program,
##   Copyright (C) 1987, 1990 California Institute of Technology.
##   Original authors: Dave Gillespie, port by Rick Koshi
##   Unix Port Maintainer: John Lazzaro
##   Maintainers's address: lazzaro@hobiecat.cs.caltech.edu;
##                          CB 425/ CU Boulder/Boulder CO 91125. 
##
##
##This program is free software; you can redistribute it and/or modify
##it under the terms of the GNU General Public License as published by
##the Free Software Foundation (Version 1, Feb 1989).
##
##This program is distributed in the hope that it will be useful,
##but WITHOUT ANY WARRANTY; without even the implied warranty of
##MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
##GNU General Public License for more details.
##
##You should have received a copy of the GNU General Public License
##along with this program; see the file ../COPYING.  If not, write to
##the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
##
##
## Command to reverse a curve (from front to back)

define reverse newcurve = curve
   local i len                ## Local variables
   local xc = ${curve}_x      ## Local variables with initialization
   local yc = $curve
   len = cvlen(curve)         ## No "$", since cvlen wants a string
   for i = 1 : len
      poke yc @ i = cvidx(curve,      len-i+1)
      poke xc @ i = cvidx(curve+"_x", len-i+1)
   endfor
   splice ${newcurve} = xc : yc
enddef

define [after] reverse curve
   reverse $curve = $curve    ## Default is to reverse the curve in-place
enddef