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%
% points.tex
%
\section{Chart::Points}
\name{Chart::Points}
\file{Points.pm}
\requires{Chart::Base, GD, Carp, FileHandle}
\begin{Description}
\class{Points} is a subclass of class \class{Chart::Base}.\\
The class Points creates a point chart.
\end{Description}
\parindent 0pt{\large Example:}
\begin{figure}[h]
\begin{center}
\includegraphics[scale=0.5]{points.png}
\end{center}
\caption{Points chart}
\label{fig:points}
\end{figure}
\begin{verbatim}
use Chart::Points;
$g = Chart::Points->new();
$g->add_dataset (1, 4, 3, 6, 2, 2.5); # x-coordinates
$g->add_dataset (1, 5, 3, 2, 3, 3.2); # y-coordinates dataset 1
$g->add_dataset (2, 6, 4.8, 1, 4, 4.2); # y-coordinates dataset 2
@hash = ('title' => 'Points Chart',
'xy_plot' => 'true',
'x_ticks' => 'vertical',
'legend' => 'none',
'sort' => 'true',
'precision' => 3,
'include_zero' => 'true',
);
$g->set (@hash);
$g->png ("Grafiken/points.png");
\end{verbatim}
\begin{Constructor}
An instance of a points chart object can be created with the constructor \textit{new()}:
\begin{quote}
\fett{\$obj = Chart::Points->new();}\\
\fett{\$obj = Chart::Points->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
All universal valid methods, see page \pageref{methods} of class \class{Chart::Base}. \\[\parabstand]
%
\Attributes
All universal valid options, see page \pageref{options}.
Also available these special options:
\begin{description}
\item['y\_axes'] Tells chart where to place the y-axis.
Valid values are 'left', 'right' and 'both'. Defaults to 'left'.
\item['pt\_size'] Sets the radius of the points in pixels. Default is 18.
\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['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'.
\end{description}
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