PostScript::File::Functions - Collection of useful PostScript functions
This document describes version 2.20 of PostScript::File::Functions, released February 11, 2012 as part of PostScript-File version 2.20.
use PostScript::File; my $ps = PostScript::File->new; $ps->use_functions(qw( setColor showCenter )); $ps->add_to_page("1 setColor\n" . "400 400 (Hello, World!) showCenter\n");
PostScript::File::Functions provides a library of handy PostScript functions that can be used in documents created with PostScript::File. You don't normally use this module directly; PostScript::File's
use_functions method loads it automatically.
LEFT TOP RIGHT BOTTOM boxPath
Given the coordinates of the sides of a box, this creates a new, closed path starting at the bottom right corner, across to the bottom left, up to the top left, over to the top right, and then back to the bottom right.
LEFT TOP RIGHT BOTTOM clipBox
This clips to the box defined by the coordinates.
LEFT TOP RIGHT BOTTOM drawBox
This calls boxPath to and then strokes the path using the current pen.
LEFT TOP RIGHT BOTTOM COLOR fillBox
WIDTH X Y hline
Stroke a horizontal line with the current pen with the left endpoint at position
X, Y, extending
WIDTH points rightwards.
setrgbcolor into a single function. You can provide either an array of 3 numbers for
setrgbcolor, or a single number for
setgray. The "str" in PostScript::File function was designed to format the parameter to this function.
X Y STRING showCenter
STRING centered horizontally at position X using baseline Y and the current font.
X Y STRING showLeft
STRING left justified at position X using baseline Y and the current font.
X Y LINES SPACING FUNC showLines
FUNC for each element of
LINES, which should be an array of strings.
FUNC is called with
X Y STRING on the stack, and it must pop those off.
SPACING is subtracted from
Y after every line.
FUNC will normally be
X Y STRING showRight
STRING right justified at position X using baseline Y and the current font.
HEIGHT X Y vline
Stroke a vertical line with the current pen with the bottom endpoint at position
X, Y, extending
HEIGHT points upwards.
While you don't normally deal with PostScript::File::Functions objects directly, it is possible. The following methods are available:
$funcs = PostScript::File::Functions->new;
The constructor takes no parameters.
Add one or more functions to the procset to be generated. All dependencies of the requsted functions are added automatically. See "POSTSCRIPT FUNCTIONS" for the list of available functions.
This is short for
$ps->add_procset( $funcs->generate_procset($basename) );
$ps should normally be a PostScript::File object. See "add_procset" in PostScript::File.
($name, $code, $version) = $funcs->generate_procset($basename);
This collects the requsted functions into a block of PostScript code.
$name is a suitable name for the procset, created by appending the ids of the requsted functions to
$basename is omitted, it defaults to the class name with
:: replaced by
$code is a block of PostScript code that defines the functions. It contains no comments or excess whitespace.
$version is the version number of the procset.
In scalar context, returns
%s is not an available function
You requsted a function that this version of PostScript::File::Functions doesn't provide.
PostScript::File::Functions requires no configuration files or environment variables.
No bugs have been reported.
Christopher J. Madsen
<perl AT cjmweb.net>
Please report any bugs or feature requests to
<bug-PostScript-File AT rt.cpan.org> or through the web interface at http://rt.cpan.org/Public/Bug/Report.html?Queue=PostScript-File.
You can follow or contribute to PostScript-File's development at http://github.com/madsen/postscript-file.
This software is copyright (c) 2012 by Christopher J. Madsen.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
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