source: trunk/xgraph/jpgraph/Examples/windrose_ex0.php

<?php
require_once ('jpgraph/jpgraph.php');
require_once ('jpgraph/jpgraph_windrose.php');

// Data can be specified using both ordinal index of the axis
// as well as the direction label
$data = array(
    0 => array(5,5,5,8),
    1 => array(3,4,1,4),
    'WSW' => array(1,5,5,3),
    'N' => array(2,3,8,1,1),
    15 => array(2,3,5));

// First create a new windrose graph with a title
$graph = new WindroseGraph(400,400);
$graph->title->Set('A basic Windrose graph');

// Create the windrose plot.
$wp = new WindrosePlot($data);

// Add and send back to browser
$graph->Add($wp);
$graph->Stroke();
?>