PostScript::File::Functions(3) Collection of useful PostScript functions

VERSION

This document describes version 2.22 of PostScript::File::Functions, released May 9, 2015 as part of PostScript-File version 2.22.

SYNOPSIS


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");

DESCRIPTION

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.

POSTSCRIPT FUNCTIONS

boxPath

  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.

clipBox

   LEFT TOP RIGHT BOTTOM clipBox

This clips to the box defined by the coordinates.

drawBox

   LEFT TOP RIGHT BOTTOM drawBox

This calls boxPath to and then strokes the path using the current pen.

fillBox

  LEFT TOP RIGHT BOTTOM COLOR fillBox

This fills the path created by boxPath with "COLOR", which can be anything accepted by setColor.

hLine

  WIDTH X Y hline

Stroke a horizontal line with the current pen with the left endpoint at position "X, Y", extending "WIDTH" points rightwards.

setColor

  RGB-ARRAY|BW-NUMBER setColor

This combines "setgray" and "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.

showCenter

  X Y STRING showCenter

This prints "STRING" centered horizontally at position X using baseline Y and the current font.

showLeft

  X Y STRING showLeft

This prints "STRING" left justified at position X using baseline Y and the current font.

showLines

  X Y LINES SPACING FUNC showLines

This calls "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 "showCenter", "showLeft", or "showRight".

showRight

  X Y STRING showRight

This prints "STRING" right justified at position X using baseline Y and the current font.

vLine

  HEIGHT X Y vline

Stroke a vertical line with the current pen with the bottom endpoint at position "X, Y", extending "HEIGHT" points upwards.

METHODS

While you don't normally deal with PostScript::File::Functions objects directly, it is possible. The following methods are available:

new

  $funcs = PostScript::File::Functions->new;

The constructor takes no parameters.

add

  $funcs->add('functionRequested', ...);

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.

add_to_file

  $funcs->add_to_file($ps, $basename);

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.

generate_procset

  ($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. If $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 $code.

DIAGNOSTICS

"%s is not an available function"
You requsted a function that this version of PostScript::File::Functions doesn't provide.

CONFIGURATION AND ENVIRONMENT

PostScript::File::Functions requires no configuration files or environment variables.

INCOMPATIBILITIES

None reported.

BUGS AND LIMITATIONS

No bugs have been reported.

AUTHOR

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 <https://github.com/madsen/postscript-file>.

COPYRIGHT AND LICENSE

This software is copyright (c) 2015 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.

DISCLAIMER OF WARRANTY

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE ``AS IS'' WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENSE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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