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/* 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 = '<unknown 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).
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