source: trunk/xgraph/jpgraph/Examples/windrose_ex8.1.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(
    '45.9' => array(3,2,1,2,2),
    355 => array(1,1,1.5,2),
    180 => array(1,1,1.5,2),
    150 => array(1,2,1,3),
    'S' => array(2,3,5,1),
    );

// Add some labels for  afew of the directions
$labels = array(355=>"At\nHome base",180=>"Probe\n123",150=>"Power\nplant");

// Define the color,weight and style of some individual radial grid lines.
$axiscolors = array(355=>"red");
$axisweights = array(355=>8);
$axisstyles = array(355=>'solid',150=>'solid');

// First create a new windrose graph with a title
$graph = new WindroseGraph(400,460);
$graph->title->Set('Adding label backgrounds');
$graph->title->SetFont(FF_VERDANA,FS_BOLD,14);
$graph->title->SetColor('navy');

// Create the free windrose plot.
$wp = new WindrosePlot($data);
$wp->SetType(WINDROSE_TYPEFREE);
$wp->scale->SetLabelFillColor('lightblue','black');

// Specify colors weights and style for the radial gridlines
$wp->SetRadialColors($axiscolors);
$wp->SetRadialWeights($axisweights);
$wp->SetRadialStyles($axisstyles);

// Add a few labels
$wp->SetLabels($labels);

// Add some "arbitrary" text to the center
$wp->scale->SetZeroLabel("SOx\n8%%");

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