source: trunk/xgraph/jpgraph/Examples/contourex03.php

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

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

$data = array( 
            array (0.5,1.1,1.5,1,2.0,3,3,2,1,0.1),
            array (1.0,1.5,3.0,5,6.0,2,1,1.2,1,4),
            array (0.9,2.0,2.1,3,6.0,7,3,2,1,1.4),
            array (1.0,1.5,3.0,4,6.0,5,2,1.5,1,2),
            array (0.8,2.0,3.0,3,4.0,4,3,2.4,2,3),
            array (0.6,1.1,1.5,1,4.0,3.5,3,2,3,4),
            array (1.0,1.5,3.0,5,6.0,2,1,1.2,2.7,4),
            array (0.8,2.0,3.0,3,5.5,6,3,2,1,1.4),
            array (1.0,1.5,3.0,4,6.0,5,2,1,0.5,0.2));


// Setup a basic graph context with some generous margins to be able
// to fit the legend            
$graph = new Graph(500,380);
$graph->SetMargin(40,140,60,40);        

// Enable antialias. Note with antiaaliasing only line weight=1 is supported.
$graph->img->SetAntiAliasing();

$graph->title->Set("Example of contour plot");
$graph->title->SetFont(FF_ARIAL,FS_BOLD,14);

// For contour plots it is custom to use a box style ofr the axis
$graph->legend->SetPos(0.05,0.5,'right','center');
$graph->SetScale('intint');
$graph->SetAxisStyle(AXSTYLE_BOXOUT);
$graph->xgrid->Show();
$graph->ygrid->Show();


// A simple contour plot with 19 isobars and flipped vertical range
$cp = new ContourPlot($data,10,true);

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

// Invert the legend to th lowest isobar is on top
$cp->Invertlegend();
$graph->Add($cp);

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

?>