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%
% linespoints.tex
%
\section{Chart::LinesPoints}
\name{Chart::LinesPoints}
\file{LinesPoints.pm}
\requires{Chart::Base, GD, Carp, FileHandle}
\begin{Description}
\class{LinesPoints} is a subclass of \class{Chart::Base}.
The class \class{LinesPoints} creates a lines chart with points marking the
individual koordinates of the data.
\end{Description}
\parindent 0pt{\large Example:}
\begin{figure}[h]
\begin{center}
\includegraphics[scale=0.6]{d_linesp2.png}
\end{center}
\caption{Linespoints chart}
\label{fig:d_linesp2}
\end{figure}
\begin{verbatim}
use Chart::LinesPoints;
use strict;
my (@data1, @data2, @data4, @data3, @labels, %hash, $g);
@labels = qw(1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17);
@data1 = qw (-7 -5 -6 -8 -9 -7 -5 -4 -3 -2 -4 -6 -3 -5 -3 -4 -6);
@data2 = qw (-1 -1 -1 -1 -2 -2 -3 -3 -4 -4 -6 -3 -2 -2 -2 -1 -1);
@data3 = qw (-4 -4 -3 -2 -1 -1 -1 -2 -1 -1 -3 -2 -4 -3 -4 -2 -2);
@data4 = qw (-6 -3 -2 -3 -3 -3 -2 -1 -2 -3 -1 -1 -1 -1 -1 -3 -3);
$g = Chart::LinesPoints->new(600,300);
$g->add_dataset(@labels);
$g->add_dataset(@data1);
$g->add_dataset(@data2);
$g->add_dataset(@data3);
$g->add_dataset(@data4);
%hash =(
'integer_ticks_only' => 'true',
'title' => 'Soccer Season 2002\n ',
'legend_labels' => ['NY Soccer Club', 'Denver Tigers',
'Houston Spacecats', 'Washington Presidents'],
'y_label' => 'position in the table',
'x_label' => 'day of play',
'grid_lines' => 'true',
'f_y_tick' => \&formatter,
);
$g->set ( %hash);
$g->png ("Grafiken/d_linesp2.png");
#just a trick, to let the y scale start at the biggest point:
#initiate with negative values, remove the minus sign!
sub formatter {
my $label = shift;
$label = substr($label, 1,2);
return $label;
}
\end{verbatim}
\begin{Constructor}
An instance of a linespoints chart object can be created with the constructor
\textit{new()}:
\begin{quote}
\parindent 0pt
\fett{\$obj = Chart::LinesPoints->new();}\\
\fett{\$obj = Chart::LinesPoints->new(\parameter{width}, \parameter{height});}
\end{quote}
If \textit{new()} has no arguments, the constructor returns an image with the size 300x400 pixels.
If \textit{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}.
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['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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