source: trunk/xgraph/jpgraph/Examples/basic_contourex03-2.php

<?php // content="text/plain; charset=utf-8"
// Basic contour plot example

require_once ('jpgraph/jpgraph.php');
require_once ('jpgraph/jpgraph_contour.php');

$data = array(
            array ( 12,7,3,15 ),
            array ( 18,5,1, 9 ),
            array ( 13,9,5,12),
            array (  5,3,8, 9 ),
            array (  1,8,5, 7 ));


// Basic contour graph
$graph = new Graph(350,250);
$graph->SetScale('intint');

// Show axis on all sides
$graph->SetAxisStyle(AXSTYLE_BOXOUT);

// Adjust the margins to fit the margin
$graph->SetMargin(30,100,40,30);

// Setup
$graph->title->Set('Basic contour plot with multiple axis');
$graph->title->SetFont(FF_ARIAL,FS_BOLD,12);

// A simple contour plot with default arguments (e.g. 10 isobar lines)
$cp = new ContourPlot($data,10,2);

// Display the legend
$cp->ShowLegend();

$graph->Add($cp);

// ... and send the graph back to the browser
$graph->Stroke();

?>