NAME
    Graphics::Potrace - bindings to the potrace library

VERSION
    version 0.74

SYNOPSIS
       # Step by step
       use Graphics::Potrace qw< raster >;
       my $raster = raster('
       ..........................
       .......XXXXXXXXXXXXXXX....
       ..XXXXXXXX.......XXXXXXX..
       ....XXXXX.........XXXXXX..
       ......XXXXXXXXXXXXXXX.....
       ...XXXXXX........XXXXXXX..
       ...XXXXXX........XXXXXXX..
       ....XXXXXXXXXXXXXXXXXX....
       ..........................
       ');
       my $vector = $raster->trace();
       $vector->export(Svg => file => 'example.svg');
       $vector->export(Svg => file => \my $svg_dump);
       $vector->export(Svg => fh   => \*STDOUT);
       my $eps = $vector->render('Eps');

       # All in one facility
       use Graphics::Potrace qw< trace >;
       trace(
          raster => '
          ..........................
          .......XXXXXXXXXXXXXXX....
          ..XXXXXXXX.......XXXXXXX..
          ....XXXXX.........XXXXXX..
          ......XXXXXXXXXXXXXXX.....
          ...XXXXXX........XXXXXXX..
          ...XXXXXX........XXXXXXX..
          ....XXXXXXXXXXXXXXXXXX....
          ..........................
          ',
          vectorial => [ Svg => file => 'example.svg' ],
       );

       # There is a whole lot of DWIMmery in both raster() and trace().
       # Stick to Graphics::Potrace::Raster for finer control
       use Graphics::Potrace::Raster;
       my $raster = Graphics::Potrace::Raster->load(
          Ascii => text => '
          ..........................
          .......XXXXXXXXXXXXXXX....
          ..XXXXXXXX.......XXXXXXX..
          ....XXXXX.........XXXXXX..
          ......XXXXXXXXXXXXXXX.....
          ...XXXXXX........XXXXXXX..
          ...XXXXXX........XXXXXXX..
          ....XXXXXXXXXXXXXXXXXX....
          ..........................
          ',
       );
       # you know what to do with $raster - see above!

DESCRIPTION
    Potrace (<http://potrace.sourceforge.net/>) is a program (and a library)
    by Peter Selinger for *Transforming bitmaps into vector graphics*. This
    distribution aims at binding the library from Perl for your fun and
    convenience.

INTERFACE
  raster
       my $raster = raster(@parameters);

    Generate a Graphics::Potrace::Raster object for further usage.

    If the first parameter you provide is already such an object, it is
    returned back. This lets you forget about what you actually have, and it
    might be handy.

    Otherwise, a new Graphics::Potrace::Raster object is created, and
    "dwim_load" in Graphics::Potrace::Raster is called upon it passing the
    provided parameters. This applies an heuristic to give you something
    reasonable, see there for details.

  raster2vectorial
       my $vector = raster2vectorial($raster, %parameters);
       my $vector = raster2vectorial($raster, \%parameters);

    Arguments:

    $raster
        a "Graphics::Potrace::Raster" object, or anything that has a
        "packed()" method programmed to return the right hash ref.

    %parameters
    $parameters
        parameters for tracing. This version of the bindings is aligned with
        "libpotrace" 1.10 and supports the following parameters:

        *   turdsize

        *   turnpolicy

        *   opticurve

        *   alphamax

        *   opttolerance

        See e.g. <http://potrace.sourceforge.net/potracelib.pdf> for
        details.

    You should never actually need this function, because you can just as
    well call:

       my $vector = $raster->trace(%parameters); # or with \%parameters

    unless $raster isn't actually a "Graphics::Potrace::Raster" object and
    you managed to duck a "packed()" method in it.

  trace
       my $vector = trace(%parameters);
       my $vector = trace($parameters);

    This is the most *Do What I Mean* (a.k.a. DWIM) function of the whole
    distribution. It tries to be as bloated as it can, but to provide you a
    single interface for your one-off needs.

    The following arguments can be provided either via %parameters or
    through an input hash ref:

    "raster"
        the raster to load. This parameter is used to call "raster" above,
        see there and "dwim_load" in Graphics::Potrace::Raster for in-depth
        documentation. And yes, if you *already* have a
        Graphics::Potrace::Raster object you can pass it in.

        This parameter is mandatory.

    "vectorial"
        a description of what you want to do with the vector, e.g. export it
        or get a representation. If present, this parameter is expected to
        be an array reference containing parameters for "export" in
        Graphics::Potrace::Vectorial, see there for details.

        This parameter is optional.

    *all Potrace parameters supported by "raster2trace"*
        these parameters will be passed over to "raster2trace", they are all
        optional.

    Any other parameter will be ignored.

  version
    This function returns the version of the Potrace library.

SEE ALSO
    See <http://potrace.sourceforge.net/> for Potrace - it's awesome!

AUTHOR
    Flavio Poletti <polettix@cpan.org>

COPYRIGHT AND LICENSE
    Copyright (C) 2011-2013 by Flavio Poletti polettix@cpan.org.

    This module is free software. You can redistribute it and/or modify it
    under the terms of the Artistic License 2.0.

    This program 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.