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%
% lines.tex
%
\section{Chart::Lines}
\name{Chart::Lines}
\file{Lines.pm}
\requires{Chart::Base, GD, Carp, FileHandle}
\begin{Description}
\class{Lines} is a subclass of \class{Chart::Base}.\\
The class Lines creates a lines chart.
\end{Description}
\parindent 0pt{\large Example:}
\begin{figure}[h]
\begin{center}
\includegraphics[scale=0.5]{d_lines2.png}
\end{center}
\caption{Lines chart}
\label{fig:lines}
\end{figure}
\begin{verbatim}
use Chart::Lines;
$g = Chart::Lines->new();
$g->add_dataset ('foo', 'bar', 'junk', 'ding', 'bat');
$g->add_dataset ( -4, 3, -4, -5, -2);
$g->add_dataset ( 2, 10, -3, 8, 3);
$g->add_dataset (-10, 2, 4, -3, -3);
$g->add_dataset ( 7, -5, -3, 4, 7);
%hash = ('legend_labels' => ['1st Quarter', '2nd Quarter',
'3rd Quarter', '4th Quarter'],
'y_axes' => 'both',
'title' => 'Lines Demo',
'grid_lines' => 'true',
'legend' => 'left',
'legend_example_size' => 20,
'colors' => {'text' => 'blue',
'misc' => 'blue',
'background' => 'grey',
'grid_lines' => 'light_blue',
'dataset0' => [220,0,0],
'dataset1' => [200,0,100],
'dataset2' => [150,50,175],
'dataset3' => [170,0,255] },
);
$g->set (%hash);
$g->png ("lines.png");
\end{verbatim}
\begin{Constructor}
An instance of a lines chart object can be created with the constructor \textit{new()}:
\begin{quote}
\fett{\$obj = Chart::Lines->new();}\\
\fett{\$obj = Chart::Lines->new(\parameter{width}, \parameter{height});}
\end{quote}
If \textit{new()} has no arguments,
the constructor returns an image with the size 300x400 pixels. If new has two arguments
\parameter{width} and \parameter{height}, it returns an image with the desired size.
\end{Constructor}
\Methods
\method{All universal valid methods, see page \pageref{methods} of \class{Chart::Base}.}\\[\parabstand]
%
\Attributes
All universal valid options, see page \pageref{options}.
Special options for this type of chart are:\\
\begin{description}
\item['y\_axes'] Tells chart where to place the y-axis.
Valid values are 'left', 'right' and 'both'. Defaults to 'left'.
\item['brush\_size'] Sets the width of the lines in pixels. Default is 6.
\item['xy\_plot'] Forces Chart to plot a x-y-graph, which means that the x-axis
is also numeric if set to 'true'.
Very useful for plots of mathematical functions. Defaults to 'false'.
\item['sort'] Sorts the data of a x-y-graph ascending if set to 'true'.
Should be set if the added data isn't sorted. Defaults to 'false'.
\item['stepline'] The points are connected by a stepping function,
instead by a direct line if set to 'true'.
Defaults to 'false'.
\item['stepline\_mode'] Determine whether to start with the first point
(if set to 'begin') or end with the last point if set to 'end'.
Defaults to 'begin'.
\end{description}
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