sunspotsex6.php
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<?php // content="text/plain; charset=utf-8"
require_once ("jpgraph/jpgraph.php");
require_once ("jpgraph/jpgraph_line.php");
require_once ("jpgraph/jpgraph_bar.php");
 
function readsunspotdata($aFile, &$aYears, &$aSunspots) {
 
    $lines = @file($aFile,FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES);
    if( $lines === false ) {
        throw new JpGraphException('Can not read sunspot data file.');
    }
    foreach( $lines as $line => $datarow ) {
        $split = preg_split('/[\s]+/',$datarow);
        $aYears[] = substr(trim($split[0]),0,4);
        $aSunspots[] = trim($split[1]);
    }
}
 
$year = array();
$ydata = array();
readsunspotdata('yearssn.txt',$year,$ydata);
 
 // Width and height of the graph
$width = 600; $height = 200;
 
// Create a graph instance
$graph = new Graph($width,$height);
 
// Specify what scale we want to use,
// int = integer scale for the X-axis
// int = integer scale for the Y-axis
$graph->SetScale('intint');
 
// Setup a title for the graph
$graph->title->Set('Sunspot example');
 
// Setup titles and X-axis labels
$graph->xaxis->title->Set('(year from 1701)');
 
// Setup Y-axis title
$graph->yaxis->title->Set('(# sunspots)');
 
// Create the bar plot
$barplot=new BarPlot($ydata);
 
// Add the plot to the graph
$graph->Add($barplot);
 
// Display the graph
$graph->Stroke();
 
?>