/* Part of XPCE --- The SWI-Prolog GUI toolkit Author: Jan Wielemaker and Anjo Anjewierden E-mail: jan@swi.psy.uva.nl WWW: http://www.swi.psy.uva.nl/projects/xpce/ Copyright (c) 2002-2011, University of Amsterdam All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ :- module(pce_print_graphics, []). :- use_module(library(pce)). :- use_module(library(pce_template)). :- use_module(library(pce_shell)). :- pce_autoload(finder, library(find_file)). :- pce_global(@finder, new(finder)). /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Public methods: ->print Prints the content of the Window as a single page ->save_postscript: [file], [directory] Save content of the Window as PostScript - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ :- pce_begin_class(print_graphics, template, "Template defining ->print"). /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Print the image to the default printer. Also this method should be extended by requesting additional parameters from the user. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ print(Canvas) :-> "Send to default printer":: print_canvas(Canvas). /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - There are two routes to print. On MS-Windows printing is achieved by drawing on a GDI representing a printer, after which the Windows printer driver creates printer-codes and sends them to the printer. The standard Windows print dialog is shown by win_printer->setup. Next we need some calculation effort to place our diagram reasonably on the page. In the Unix world, things go different. In general you make a PostScript file and hand this to the print-spooler, which will translate the device-independant PostScript to whatever the printer needs. XPCE doesn't (yet) try to hide the difference between these two approaches. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ print_canvas(Canvas) :- % MS-Windows get(@pce, convert, win_printer, class, _), !, ( send(Canvas, has_get_method, default_file), get(Canvas, default_file, Job) -> true ; Job = '' ), new(Prt, win_printer(Job)), send(Prt, setup, Canvas), send(Prt, open), get(Canvas, bounding_box, area(X, Y, W, H)), get(@display, dots_per_inch, size(DX, DY)), InchW is W/DX, InchH is H/DY, get(Prt, size, size(PW0, PH0)), get(Prt, dots_per_inch, size(RX, RY)), MarX is RX, % default 1 inch margins MarY is RY, PrInchW is (PW0-MarX*2)/RX, PrInchH is (PH0-MarY*2)/RY, send(Prt, map_mode, isotropic), ( InchW < PrInchW, InchH < PrInchH % it fits on the page -> OX is MarX + ((PrInchW-InchW)/2)*RX, send(Prt, window, area(X, Y, DX, DY)), send(Prt, viewport, area(OX, MarY, RX, RY)) ; Aspect is min(PrInchW/InchW, PrInchH/InchH), ARX is integer(Aspect*RX), ARY is integer(Aspect*RY), send(Prt, window, area(X, Y, DX, DY)), send(Prt, viewport, area(MarX, MarY, ARX, ARY)) ), send(Prt, draw_in, Canvas?graphicals), send(Prt, close), free(Prt). print_canvas(Canvas) :- % Unix/PostScript get(Canvas, print_command, Command), new(PsFile, file), send(PsFile, open, write), send(PsFile, append, Canvas?postscript), send(PsFile, append, 'showpage\n'), send(PsFile, close), get(PsFile, absolute_path, File), get(string('%s "%s"', Command, File), value, ShellCommand), pce_shell_command('/bin/sh'('-c', ShellCommand)), send(PsFile, remove), send(PsFile, done), send(Canvas, report, status, 'Sent to printer'). print_command(Canvas, Command:name) :<- "Get name of the printer":: get(Canvas, frame, Frame), default_printer(DefPrinter), get(Canvas, print_command_template, CmdTempl), print_cmd(CmdTempl, DefPrinter, Cmd), new(D, dialog(print_command?label_name)), send(D, append, new(P, text_item(print_command, Cmd))), send(D, append, button(cancel, message(D, return, @nil))), send(D, append, button(ok, message(D, return, P?selection))), send(D, default_button, ok), send(D, transient_for, Frame), send(D, modal, transient), get(D, confirm_centered, Canvas?frame?area?center, Answer), send(D, destroy), Answer \== @nil, Command = Answer. default_printer(Printer) :- get(@pce, environment_variable, 'PRINTER', Printer), !. default_printer(postscript). print_job_name(_, Job) :<- "Default name of the printer job":: Job = 'XPCE/SWI-Prolog'. print_command_template(_, Command) :<- "Default command to send a job to the printer":: Command = 'lpr -P%p'. /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - print_cmd(+Template, +Printer, +File, -Command) determines the shell command to execute in order to get `File' printed on `Printer' using the given template. The substitutions are handled by a regex object. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ print_cmd(Template, Printer, Cmd) :- new(S, string('%s', Template)), substitute(S, '%p', Printer), get(S, value, Cmd), free(S). substitute(S, F, T) :- new(R, regex(F)), send(R, for_all, S, message(@arg1, replace, @arg2, T)), free(R). /******************************* * POSTSCRIPT * *******************************/ save_postscript(Canvas, File:file=[file], Directory:directory=[directory]) :-> "Save content as PostScript to File":: ( File == @default -> get(@finder, file, save, chain(tuple('PostScript', ps), tuple('Encapsulated PostScript', eps)), Directory, FileName) ; FileName = File ), new(PsFile, file(FileName)), send(PsFile, open, write), send(PsFile, append, Canvas?postscript), send(PsFile, append, 'showpage\n'), send(PsFile, close), send(Canvas, report, status, 'Saved PostScript to %s', PsFile). :- pce_end_class(print_graphics).