<?php
require_once("/usr/local/lib/php/20100525/phpchartdir.php");

# The data for the chart
$data = array(5.1, 1.5, 5.1, 4.0, 1.7, 8.7, 9.4, 2.1, 3.5, 8.8, 5.0, 6.0);

# The labels for the chart
$labels = array("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept",
    "Oct", "Nov", "Dec");

# Create a PolarChart object of size 400 x 420 pixels. with a metallic blue (9999ff)
# background color and 1 pixel 3D border
$c = new PolarChart(400, 420, metalColor(0x9999ff), 0x000000, 1);

# Add a title to the chart using 16 pts Arial Bold Italic font. The title text is
# white (0xffffff) on deep blue (000080) background
$textBoxObj = $c->addTitle("Chemical Concentration", "arialbi.ttf", 16, 0xffffff);
$textBoxObj->setBackground(0x000080);

# Set center of plot area at (200, 240) with radius 145 pixels. Set background color
# to green (0x33ff33)
$c->setPlotArea(200, 240, 145, 0x33ff33);

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

# Color the sector between label index = 5.5 to 7.5 as red (ff3333) zone
$c->angularAxis->addZone(5.5, 7.5, 0xff3333);

# Color the sector between label index = 4.5 to 5.5, and also between 7.5 to 8.5, as
# yellow (ff3333) zones
$c->angularAxis->addZone(4.5, 5.5, 0xffff00);
$c->angularAxis->addZone(7.5, 8.5, 0xffff00);

# Set the grid style to circular grid
$c->setGridStyle(false);

# Use semi-transparent (40ffffff) label background so as not to block the data
$textBoxObj = $c->radialAxis->setLabelStyle();
$textBoxObj->setBackground(0x40ffffff, 0x40000000);

# Add a legend box at (200, 30) top center aligned, using 9 pts Arial Bold font. with
# a black border.
$legendBox = $c->addLegend(200, 30, false, "arialbd.ttf", 9);
$legendBox->setAlignment(TopCenter);

# Add legend keys to represent the red/yellow/green zones
$legendBox->addKey("Very Dry", 0xff3333);
$legendBox->addKey("Critical", 0xffff00);
$legendBox->addKey("Moderate", 0x33ff33);

# Add a blue (0x80) line layer with line width set to 3 pixels and use purple
# (ff00ff) cross symbols for the data points
$layer = $c->addLineLayer($data, 0x000080);
$layer->setLineWidth(3);
$layer->setDataSymbol(Cross2Shape(), 15, 0xff00ff);

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