source: trunk/xgraph/jpgraph/Examples/windrose_ex9.1.php@ 42

<?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(3,2,1,2,2),
    4 => array(1,1,1.5,2),
    6 => array(1,1,1.5,2),
    12 => array(2,3,5,1),
);

$xpos1 = 0.26;
$xpos2 = 0.74;
$ypos1 = 0.5;
$ypos2 = 0.9;

// First create a new windrose graph with a title
$graph = new WindroseGraph(650,350);
$graph->title->Set('Interpretation of ordinal keys');
$graph->title->SetFont(FF_VERDANA,FS_BOLD,14);
$graph->title->SetColor('navy');

// Create the first plot
$wp1 = new WindrosePlot($data);
$wp1->SetType(WINDROSE_TYPE16);

// This is the default encoding
$wp1->SetDataKeyEncoding(KEYENCODING_ANTICLOCKWISE);
$wp1->legend->Hide();
$wp1->SetPos($xpos1,$ypos1);
$wp1->SetSize(0.5);

// Create the second plot
$wp2 = new WindrosePlot($data);
$wp2->SetType(WINDROSE_TYPE16);
$wp2->SetDataKeyEncoding(KEYENCODING_CLOCKWISE);
$wp2->legend->Hide();
$wp2->SetPos($xpos2,$ypos1);
$wp2->SetSize(0.5);

$txt1 = new Text('KEYENCODING_ANTICLOCKWISE');
$txt1->SetFont(FF_COURIER,FS_BOLD,12);
$txt1->SetPos($xpos1,$ypos2);
$txt1->SetAlign('center','top');

$txt2 = new Text('KEYENCODING_CLOCKWISE');
$txt2->SetFont(FF_COURIER,FS_BOLD,12);
$txt2->SetPos($xpos2,$ypos2);
$txt2->SetAlign('center','top');

// Finally add it to the graph and send back to the client
$graph->Add($wp1);
$graph->Add($txt1);

$graph->Add($wp2);
$graph->Add($txt2);

$graph->Stroke();
?>