NAME

       Data::DownSample::LargestTriangleThreeBuckets  - downsample a data set while retaining its
       visual characteristics

VERSION

       Version 1.00

DESCRIPTION

       Implements a downsample technique known as Largest Triangle Three Buckets as defined in
       Sveinn Steinarsson MS thesis.

       http://skemman.is/stream/get/1946/15343/37285/3/SS_MSthesis.pdf

       The idea is to downsample a data set without losing the visual character of the plotted
       data.  The technique draws on ideas in cartographic generalization or polyline
       simplification.  This technique is often useful in client-server applications such as
       webserver-browser where the length of the data far exceeds the pixels available to plot.
       Reducing the data size significantly speeds up data transfer and rendering time.

SYNOPSIS

       use Data::DownSample::LargestTriangleThreeBuckets;

       my $lttb = new Data::DownSample::LargestTriangleThreeBuckets( {threshold=>1000} );

       my $data_src = [ [1,2], [2,3], [3,4], [4,5], ... ]; # <-- load your data source here as
       reference to a list of a list

       my $data_sampled = $lttb->lttb($data_src);

SUBROUTINES/METHODS

   lttb()
       my $data_sampled = $lttb->lttb($data_src);

       Also can overwrite the class threashold variable such as

       my $data_sampled = $lttb->lttb($data_src,20000);

       This function is an optimized version of the algorithm given in Sveinn Steinarsson paper.
       Several of the math operation are factored out of the loops and it executes better than
       33% faster.

   lttb_ref()
       my $data_sampled = $lttb->lttb_ref($data_src);

       The reference function implimentation of the algorithm given in Sveinn Steinarsson paper
       and used to verify that the optimized version is giving correct results.

AUTHOR

       Steve Troxel, "<troxel at perlworks.com>"

BUGS

       Please report any bugs or feature requests to
       "bug-data-downsample-largesttrianglethreebuckets at rt.cpan.org", or through the web
       interface at
       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Data-DownSample-LargestTriangleThreeBuckets>.
       I will be notified, and then you'll automatically be notified of progress on your bug as I
       make changes.

SUPPORT

       You can find documentation for this module with the perldoc command.

           perldoc Data::DownSample::LargestTriangleThreeBuckets

       You can also look for information at:

       •   RT: CPAN's request tracker (report bugs here)

           <http://rt.cpan.org/NoAuth/Bugs.html?Dist=Data-DownSample-LargestTriangleThreeBuckets>

       •   AnnoCPAN: Annotated CPAN documentation

           <http://annocpan.org/dist/Data-DownSample-LargestTriangleThreeBuckets>

       •   CPAN Ratings

           <http://cpanratings.perl.org/d/Data-DownSample-LargestTriangleThreeBuckets>

       •   Search CPAN

           <http://search.cpan.org/dist/Data-DownSample-LargestTriangleThreeBuckets/>

LICENSE AND COPYRIGHT

       Copyright 2016 Steve Troxel.

       This program is free software; you can redistribute it and/or modify it under the terms of
       the the Artistic License (2.0). You may obtain a copy of the full license at:

       <http://www.perlfoundation.org/artistic_license_2_0>

       Any use, modification, and distribution of the Standard or Modified Versions is governed
       by this Artistic License. By using, modifying or distributing the Package, you accept this
       license. Do not use, modify, or distribute the Package, if you do not accept this license.

       If your Modified Version has been derived from a Modified Version made by someone other
       than you, you are nevertheless required to ensure that your Modified Version complies with
       the requirements of this license.

       This license does not grant you the right to use any trademark, service mark, tradename,
       or logo of the Copyright Holder.

       This license includes the non-exclusive, worldwide, free-of-charge patent license to make,
       have made, use, offer to sell, sell, import and otherwise transfer the Package with
       respect to any patent claims licensable by the Copyright Holder that are necessarily
       infringed by the Package. If you institute patent litigation (including a cross-claim or
       counterclaim) against any party alleging that the Package constitutes direct or
       contributory patent infringement, then this Artistic License to you shall terminate on the
       date that such litigation is filed.

       Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
       "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES.  THE IMPLIED WARRANTIES OF
       MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO
       THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR
       CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
       ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF
       SUCH DAMAGE.

perl v5.32.0                                202Data::DownSample::LargestTriangleThreeBuckets(3pm)