## Copyright (C) 2008, 2009 David Bateman
##
## This file is part of Octave.
##
## Octave 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; either version 3 of the License, or (at
## your option) any later version.
##
## Octave 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 Octave; see the file COPYING.  If not, see
## <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn  {Function File} {} print ()
## @deftypefnx {Function File} {} print (@var{options})
## @deftypefnx {Function File} {} print (@var{filename}, @var{options})
## @deftypefnx {Function File} {} print (@var{h}, @var{filename}, @var{options})
## Print a graph, or save it to a file
##
## @var{filename} defines the file name of the output file.  If the
## file name has no suffix, one is inferred from the specified
## device and appended to the file name.  If no
## filename is specified, the output is sent to the printer.
##
## @var{h} specifies the figure handle.  If no handle is specified
## the handle for the current figure is used.
##
## @var{options}:
##
## @table @code
## @item -f@var{h}
##   Specify the handle, @var{h}, of the figure to be printed. The
##   default is the current figure.
##
## @item -P@var{printer}
##   Set the @var{printer} name to which the graph is sent if no
##   @var{filename} is specified.
##
## @item -G@var{ghostscript_command}
##   Specify the command for calling Ghostscript.  For Unix and Windows,
## the defaults are 'gs' and 'gswin32c', respectively.
##
## @item -color
## @itemx -mono
##   Monochrome or color output.
##
## @item -solid
## @itemx -dashed
##   Forces all lines to be solid or dashed, respectively.
##
## @item -portrait
## @itemx -landscape
##   Specify the orientation of the plot for printed output. For
## non-printed output the aspect ratio of the output corresponds to
## the plot area defined by the "paperposition" property in the
## orientation specified. This options is equivalent to changing
## the figure's "paperorientation" property.
##
## @item -d@var{device}
##   Output device, where @var{device} is one of:
##   @table @code
##   @item ps
##   @itemx ps2
##   @itemx psc
##   @itemx psc2
##     Postscript (level 1 and 2, mono and color). The FLTK backend
## generates Postscript level 3.0.
##
##   @item eps
##   @itemx eps2
##   @itemx epsc
##   @itemx epsc2
##     Encapsulated postscript (level 1 and 2, mono and color). The FLTK backend
## generates Postscript level 3.0.
##
##   @item tex
##   @itemx epslatex
##   @itemx epslatexstandalone
##   @itemx pstex
##   @itemx pslatex
##   @itemx pdflatex
##     Generate a @LaTeX{} (or @TeX{}) file for labels, and eps/ps/pdf
## for graphics.  The file produced by @code{epslatexstandalone} can be
## processed directly by @LaTeX{}.  The other formats are intended to
## be included in a @LaTeX{} (or @TeX{}) document.  The @code{tex} device
## is the same as the @code{epslatex} device. The @code{pdflatex} device
## is only available for the FLTK backend.
##
##   @item tikz
##     Generate a @LaTeX{} file using PGF/TikZ. For the FLTK the result is
##   PGF.
##
##   @item ill
##   @itemx aifm
##     Adobe Illustrator (Obsolete for Gnuplot versions > 4.2)
##
##   @item cdr
##   @itemx @nospell{corel}
##     CorelDraw
##
##   @item dxf
##     AutoCAD
##
##   @item emf
##   @itemx meta
##     Microsoft Enhanced Metafile
##
##   @item fig
##     XFig.  For the Gnuplot backend, the additional options
##     @option{-textspecial} or @option{-textnormal} can be used to control
##     whether the special flag should be set for the text in
##     the figure (default is @option{-textnormal}). 
##
##   @item hpgl
##     HP plotter language
##
##   @item mf
##     Metafont
##
##   @item png
##     Portable network graphics
##
##   @item jpg
##   @itemx jpeg
##     JPEG image
##
##   @item gif
##     GIF image (only available for the Gnuplot backend)
##
##   @item pbm
##     PBMplus
##
##   @item svg
##     Scalable vector graphics
##
##   @item pdf
##     Portable document format
##   @end table
##
##   If the device is omitted, it is inferred from the file extension,
## or if there is no filename it is sent to the printer as postscript.
##
## @item -d@var{ghostscript_device}
##   Additional devices are supported by Ghostscript.
## Some examples are;
##
##   @table @code
##   @item ljet2p 
##     HP LaserJet IIP
##
##   @item ljet3 
##     HP LaserJet III
##
##   @item deskjet
##     HP DeskJet and DeskJet Plus
##
##   @item cdj550
##     HP DeskJet 550C
##
##   @item paintjet
##     HP PointJet
##
##   @item pcx24b
##     24-bit color PCX file format
##
##   @item ppm
##     Portable Pixel Map file format
##
##   @item pdfwrite
##     Produces pdf output from eps
##   @end table
##
##   For a complete list, type `system ("gs -h")' to see what formats
## and devices are available.
##
##   When Ghostscript output is sent to a printer the size is determined
## by the figure's "papersize" property.  When the output 
## is sent to a file the size is determined by the plot box defined by
## the figure's "paperposition" property.
##
## @itemx -append
##   Appends the PS, or PDF output to a pre-existing file of the 
## same type.
##
## @itemx -r@var{NUM}
##   Resolution of bitmaps in pixels per inch.  For both metafiles and 
## SVG the default is the screen resolution, for other it is 150 dpi.
## To specify screen resolution, use "-r0".
##
## @item -tight
##   Forces a tight bounding box for eps-files.  Since Ghostscript
## is used to produce other devices, this option works for those
## devices as well.
##
## @item -S@var{xsize},@var{ysize}
##   Plot size in pixels for EMF, GIF, JPEG, PBM, PNG and SVG. For
## PS, EPS, PDF, and other vector formats the plot size is in points.
## This option is equivalent to changing the size of the plot box
## associated with "paperposition" property. Using the command form of
## the print function, you must quote the @var{xsize},@var{ysize}
## option.  For example, by writing @w{@code{"-S640,480"}}.
##
## @item -F@var{fontname}
## @itemx -F@var{fontname}:@var{size}
## @itemx -F:@var{size}
##   Associates all text with the @var{fontname} and/or @var{fontsize}.
## @var{fontname} is ignored for some devices; dxf, fig, hpgl, etc.
## @end table
##
## The filename and options can be given in any order.
## @end deftypefn

function print (varargin)

  opts = __print_parse_opts__ (varargin{:});

  if (! isfigure (opts.figure))
    error ("print: no figure to print.")
  endif

  orig_figure = get (0, "currentfigure");
  figure (opts.figure)

  if (opts.append_to_file && ! (strncmp (opts.devopt, "pdf", 3)
         || strncmp (opts.devopt(1:2), "ps", 2)))
    warning ("print:cannotappendfile", 
             "print.m: Cannot append files of type '%s'.", opts.devopt)
    opts.append_to_file = false;
  endif

  unwind_protect

    if (opts.append_to_file)
      saved_original_file = strcat (tmpnam (), ".", opts.devopt);
      opts.unlink(end+1) = {saved_original_file};
      movefile (opts.name, saved_original_file);
    endif

    ## Modify properties as specified by options
    props = [];

    ## backend tranlates figure position to eps bbox in points
    fpos = get (opts.figure, "position");
    props(1).h = opts.figure;
    props(1).name = "position";
    props(1).value = {fpos};
    fpos(3:4) = opts.canvas_size;
    set (opts.figure, "position", fpos)

    ## Set figure background to none. This is done both for
    ## consistency with Matlab and to elliminate the visible
    ## box along the figure's perimeter.
    props(2).h = opts.figure;
    props(2).name = "color";
    props(2).value{1} = get (props(2).h, props(2).name);
    set (props(2).h, props(2).name, "none");

    if (opts.force_solid != 0)
      h = findall (opts.figure, "-property", "linestyle");
      m = numel (props);
      for n = 1:numel(h)
        props(m+n).h = h(n);
        props(m+n).name = "linestyle";
        props(m+n).value = {get(h(n), "linestyle")};
      endfor
      if (opts.force_solid > 0)
        linestyle = "-";
      else
        linestyle = "--";
      endif
      set (h, "linestyle", linestyle)
    endif

    if (opts.use_color < 0
        && ! strcmp (get (opts.figure, "__backend__"), "gnuplot"))
      color_props = {"color", "facecolor", "edgecolor", "colormap"};
      for c = 1:numel(color_props)
        h = findall (opts.figure, "-property", color_props{c});
        hnone = findall (opts.figure, color_props{c}, "none");
        h = setdiff (h, hnone);
        m = numel (props);
        for n = 1:numel(h)
          rgb = get (h(n), color_props{c});
          props(m+n).h = h(n);
          props(m+n).name = color_props{c};
          props(m+n).value = {get(h(n), color_props{c})};
          xfer = repmat ([0.30, 0.59, 0.11], size (rgb, 1), 1);
          if (isnumeric (rgb))
            ## convert RGB color to RGB gray scale
            ggg = repmat (sum (xfer .* rgb, 2), 1, 3);
            set (h(n), color_props{c}, ggg)
          endif
        endfor
      endfor
    endif

    if (! isempty (opts.font) || ! isempty (opts.fontsize))
      h = findall (opts.figure, "-property", "fontname");
      m = numel (props);
      for n = 1:numel(h)
        if (! isempty (opts.font))
          props(end+1).h = h(n);
          props(end).name = "fontname";
          props(end).value = {get(h(n), "fontname")};
        endif
        if (! isempty (opts.fontsize))
          props(end+1).h = h(n);
          props(end).name = "fontsize";
          props(end).value = {get(h(n), "fontsize")};
        endif
      endfor
      if (! isempty (opts.font))
        set (h, "fontname", opts.font)
      endif
      if (! isempty (opts.fontsize))
        if (ischar (opts.fontsize))
          fontsize = str2double (opts.fontsize);
        else
          fontsize = opts.fontsize;
        endif
        set (h, "fontsize", fontsize)
      endif
    endif

    if (strcmp (opts.devopt, opts.ghostscript.device))
      opts.ghostscript.output = opts.name;
      opts.ghostscript.source = strcat (tmpnam (), ".eps");
      opts.unlink{end+1} = opts.ghostscript.source;
    endif

    ## call the backend print script
    opts = feval (strcat ("__", get (opts.figure, "__backend__"), "_print__"),
                  opts);

    if (strcmp (opts.devopt, opts.ghostscript.device))
      if (opts.tight_flag && ! opts.formatted_for_printing)
        __tight_eps_bbox__ (opts, opts.ghostscript.source);
      endif
      status = __ghostscript__ (opts.ghostscript);
      if (status != 0)
        warning ("print.m:gsfailed", "print.m: ghostscript failure")
      endif
    endif

    ## Send to the printer
    if (opts.send_to_printer)
      if (isempty (opts.ghostscript.output))
        prn_datafile = opts.name;
      else
        prn_datafile = opts.ghostscript.output;
      endif
      if (isempty (opts.printer))
        prn_cmd = sprintf ("lpr %s '%s' 2>&1", opts.lpr_options, prn_datafile);
      else
        prn_cmd = sprintf ("lpr %s -P %s '%s' 2>&1", opts.lpr_options,
                           opts.printer, prn_datafile);
      endif
      if (opts.debug)
        fprintf ("lpr command: %s\n", prn_cmd)
        [status, output] = system ("lpq");
        disp (output)
      endif
      [status, output] = system (prn_cmd);
      if (status != 0)
        disp (output)
        warning ("print.m: printing failed.")
      endif
    endif

    ## Append to file using GS
    if (opts.append_to_file)
      if (strncmp (opts.devopt, "pdf", 3))
        suffix = "pdf";
        device = suffix;
      elseif (strncmp (opts.devopt(1:2), "ps", 2))
        ## FIXME - For FLTK & Gnuplot the fonts get mangled
        ##         See "How to concatenate several PS files" at the link,
        ##         http://en.wikibooks.org/wiki/PostScript_FAQ
        suffix = "ps";
        device = suffix;
      endif
      tmp_combined_file = strcat (tmpnam (), ".", suffix);
      opts.unlink{end+1} = tmp_combined_file;
      gs_opts = "-dQUIET -dNOPAUSE -dBATCH -dSAFER -dFIXEDMEDIA";
      gs_cmd = sprintf ("%s %s -sDEVICE=%swrite -sOutputFile=%s %s %s", 
               opts.ghostscript.binary, gs_opts, device, tmp_combined_file,
               saved_original_file, opts.name);
      [status, output] = system (gs_cmd);
      if (opts.debug)
        fprintf ("Append files: %s\n", gs_cmd);
      endif
      if (status != 0)
        warning ("print:failedtoappendfile", 
                 "print.m: failed to append output to file '%s'.", opts.name)
        copyfile (saved_original_file, opts.name);
      else
        copyfile (tmp_combined_file, opts.name);
      endif
    endif

  unwind_protect_cleanup
    ## restore modified properties
    if (isstruct (props))
      for n = 1:numel(props)
        set (props(n).h, props(n).name, props(n).value{1})
      endfor
    endif

    ## Unlink temporary files
    for n = 1:numel(opts.unlink)
      [status, output] = unlink (opts.unlink{n});
      if (status != 0)
        warning ("print.m: %s, '%s'.", output, opts.unlink{n})
      endif
    endfor
  end_unwind_protect

  if (isfigure (orig_figure))
    figure (orig_figure);
  endif

endfunction