NAME
    VS::Chart - Simple module to create beautifully looking charts

SYNOPSIS
     use VS::Chart;

     my $chart = VS::Chart->new;

     .. Add data to $chart here ...
     $chart->add(@row);

     $chart->render( type => "line", as => "png", to => "my_chart.png" );

PHILOSOPHY
    *   Simple interface

    *   Defaults should look great

    *   DWIW

    *   Extendable implementation

DESCRIPTION
    This module produces charts from data. Such charts might be line, pie
    and boxes. Currently only linecharts are implemented. The renderer uses
    Cairo Graphics (<http://www.cairographics/>), a graphics library for
    creating vector graphics, to produce crisp and correct output. Currently
    we limit output support to PNG, PDF and SVG altho Cairo may support
    more.

INTERFACE
  CLASS METHODS
    new ( %ATTRIBUTES, [ no_defaults => 1 ] )
        Creates a new chart definition and sets any attributes passed in
        *%ATTRIBUTES*. If *no_defaults* is specified the chart will not be
        populated with default values when rendered.

    supported_types
        Returns a list of supported renderers.

  INSTANCE METHODS
    set ( %ATTRIBUTES )
        Sets a number of attributes. It is possible to set an attribute for
        a specific dataset by prepending the key with <column<gt>:. Columns
        starts at 0.

    get ( ATTRIBUTE )
        Get the value of an attribute.

    has ( ATTRIBUTE )
        Check if an attribute exists.

    add ( @ROW )
        Adds the data in *@ROW* to the chart. If the first element is a
        *Date::Simple* object the first column will be marked as the index
        column provider and sorted accordingly when rendered.

    render ( type => TYPE, to => PATH | CODE, [ as => FORMAT ] )
        Renders the chart using the renderer specified by *TYPE* and saves
        the output as *PATH*. By default the *FORMAT* is png but pdf or svg
        may be used instead.

        If the format is png it's possible to pass a CODE reference instead
        of a path in *to*. This will be called with the reference itself as
        the first argument and data as second. It may be called several
        times during rendering.

    dataset ( COLUMN )
        Returns the "VS::Chart::Dataset"-instance representing the data for
        the given column. Return undef if no such column has been added yet
        via add.

    rows
        Returns the number of rows of data added to the chart.

BUGS AND LIMITATIONS
    Please report any bugs or feature requests to
    "bug-vs-chart@rt.cpan.org", or through the web interface at
    <http://rt.cpan.org>.

SUPPORT
    Commercial support is available from Versed Solutions. Contact author
    for details.

AUTHOR
    Claes Jakobsson, Versed Solutions "<claesjac@cpan.org>"

LICENCE AND COPYRIGHT
    Copyright (c) 2007-2008, Versed Solutions "<info@versed.se>". All rights
    reserved.

    This software is released under the MIT license cited below.

  The "MIT" License
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the
    "Software"), to deal in the Software without restriction, including
    without limitation the rights to use, copy, modify, merge, publish,
    distribute, sublicense, and/or sell copies of the Software, and to
    permit persons to whom the Software is furnished to do so, subject to
    the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.