Simple Radar Chart

This example demonstrates the basic steps in creating radar charts.

Create a PolarChart object using PolarChart.PolarChart.
Specify the polar plot area of the chart using PolarChart.setPlotArea.
Add a polar area layer and specify the data for the area using PolarChart.addAreaLayer.
Specify the labels on the angular axis using AngularAxis.setLabels. In a polar/radar chart, the radial axis refers to the axis from the center to the perimeter of the plot area, and the angular axis refers to the axis lying on the perimeter of the plot area.
Generate the chart using BaseChart.makeChart2.

[File: phpdemo/simpleradar.php]

<?php
require_once("../lib/phpchartdir.php");

# The data for the chart
$data = array(90, 60, 65, 75, 40);

# The labels for the chart
$labels = array("Speed", "Reliability", "Comfort", "Safety", "Efficiency");

# Create a PolarChart object of size 450 x 350 pixels
$c = new PolarChart(450, 350);

# Set center of plot area at (225, 185) with radius 150 pixels
$c->setPlotArea(225, 185, 150);

# Add an area layer to the polar chart
$c->addAreaLayer($data, 0x9999ff);

# Set the labels to the angular axis as spokes
$c->angularAxis->setLabels($labels);

# Output the chart
header("Content-type: image/png");
print($c->makeChart2(PNG));
?>