source: trunk/xgraph/jpgraph/Examples/windrose_ex6.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(
    '10'  => array(1,1,2.5,4),
    '32.0' => array(3,4,1,4),
    '120.5' => array(2,3,4,4,3,2,1),
    '223.2' => array(2,4,1,2,2),
    '285.7' => array(2,2,1,2,4,2,1,1)
);

// Specify text for direction labels
$labels = array( '120.5' => "Plant\n#1275",
                 '285.7' => "Reference\n#13 Ver:2");

// Range colors to be used
$rangeColors = array('khaki','yellow','orange','orange:0.7','brown','darkred','black');

// First create a new windrose graph with a title
$graph = new WindroseGraph(400,450);

// Setup titles
$graph->title->Set('Windrose example 6');
$graph->title->SetFont(FF_VERDANA,FS_BOLD,12);
$graph->title->SetColor('navy');

$graph->subtitle->Set('(Free type plot)');
$graph->subtitle->SetFont(FF_VERDANA,FS_ITALIC,10);
$graph->subtitle->SetColor('navy');

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

// Setup a free plot
$wp->SetType(WINDROSE_TYPEFREE);

// Setup labels
$wp->SetLabels($labels);
$wp->SetLabelPosition(LBLPOSITION_CENTER);
$wp->SetLabelMargin(30);

// Setup the colors for the ranges
$wp->SetRangeColors($rangeColors);

// Adjust the font and font color for scale labels
$wp->scale->SetFont(FF_ARIAL,FS_NORMAL,9);

// Set the diameter and position for plot
$wp->SetSize(230);
$wp->SetZCircleSize(30);

// Adjust the font and font color for compass directions
$wp->SetFont(FF_ARIAL,FS_NORMAL,10);
$wp->SetFontColor('darkgreen');

// Adjust grid colors
$wp->SetGridColor('darkgreen@0.7','blue');

// Add (m/s) text to legend
$wp->legend->SetText('(m/s)');

// Display legend values with no decimals
$wp->legend->SetFormat('%d');

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