############################################################################
#
#	File:     imltogif.icn
#
#	Subject:  Program to convert image strings to GIF files
#
#	Author:   Ralph E. Griswold
#
#	Date:     May 23, 1996
#
############################################################################
#
#   This file is in the public domain.
#
############################################################################
#
#  This program converts a list of image strings given in standard input
#  to corresponding GIF images.
#
############################################################################
#
#  The options supported are:
#
#	-n s	sets prefix for image file names to s, default "image"
#	-c i	number of columns for serial numbers in file names;
#		  default 4
#	-f i	first number, default 1
#	-p	treats image string as a pattern and fills a square
#		   window of its maximum dimension
#
############################################################################
#
#  Requires:  Version 9 graphics
#
############################################################################
#
#  Links:  imageseq, imutils, numbers, options, wopen
#
############################################################################

link imageseq
link imutils
link numbers
link options
link wopen

procedure main(args)
   local count, ims, image, w, h, s, opts, pattern, prefix

   count := 0

   opts := options(args, "n:c+f+p")
   /opts["c"] := 4

   seq_init(opts)
   pattern := opts["p"]

   while ims := read() do {
      count +:= 1
      w := imswidth(ims)
      h := imsheight(ims)
      if (w | h) = 0 then {
         write(&errout, "line ", count, ": bad image string")
         next
         }
      if \pattern then w := h := max(w,h)
      image := WOpen("canvas=hidden", "size=" || w || "," || h) | {
         write(&errout, "line ", count, ": cannot open window")
         next
         }
      if \pattern then {
         WAttrib(image, "fillstyle=opaquepatterned")
         Pattern(image, ims)
         FillRectangle(image)
         }
      else DrawImage(image, 0, 0, ims) | {
         write(&errout, "line ", count, ":  cannot draw image")
         WClose(image)
         next
         }
      save_image(image)
      WClose(image)
      }

end