Overlapping Bar Chart

[File: phpdemo/overlapbar.php]
<?php
require_once("../lib/phpchartdir.php");

# The data for the bar chart
$data0 = array(100, 125, 156, 147, 87, 124, 178, 109, 140, 106, 192, 122);
$data1 = array(122, 156, 179, 211, 198, 177, 160, 220, 190, 188, 220, 270);
$data2 = array(167, 190, 213, 267, 250, 320, 212, 199, 245, 267, 240, 310);
$labels = array("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec")
    ;

# Create a XYChart object of size 580 x 280 pixels
$c = new XYChart(580, 280);

# Add a title to the chart using 14pt Arial Bold Italic font
$c->addTitle("Product Revenue For Last 3 Years", "Arial Bold Italic", 14);

# Set the plot area at (50, 50) and of size 500 x 200. Use two alternative background colors (f8f8f8
# and ffffff)
$c->setPlotArea(50, 50, 500, 200, 0xf8f8f8, 0xffffff);

# Add a legend box at (50, 25) using horizontal layout. Use 8pt Arial as font, with transparent
# background.
$c->addLegend(50, 25, false, "Arial", 8)->setBackground(Transparent);

# Set the x axis labels
$c->xAxis->setLabels($labels);

# Draw the ticks between label positions (instead of at label positions)
$c->xAxis->setTickOffset(0.5);

# Add a multi-bar layer with 3 data sets
$layer = $c->addBarLayer2(Side);
$layer->addDataSet($data0, 0xff8080, "Year 2003");
$layer->addDataSet($data1, 0x80ff80, "Year 2004");
$layer->addDataSet($data2, 0x8080ff, "Year 2005");

# Set 50% overlap between bars
$layer->setOverlapRatio(0.5);

# Add a title to the y-axis
$c->yAxis->setTitle("Revenue (USD in millions)");

# Output the chart
$viewer = new WebChartViewer("chart1");
$viewer->setChart($c, SVG);

# Include tool tip for the chart
$viewer->setImageMap($c->getHTMLImageMap("", "",
    "title='{xLabel} Revenue on {dataSetName}: {value} millions'"));
?>

<!DOCTYPE html>
<html>
<head>
    <title>Overlapping Bar Chart</title>
    <!-- Include ChartDirector Javascript Library to support chart interactions -->
    <script type="text/javascript" src="cdjcv.js"></script>
</head>
<body style="margin:5px 0px 0px 5px">
    <div style="font:bold 18pt verdana;">
        Overlapping Bar Chart
    </div>
    <hr style="border:solid 1px #000080; background:#000080" />
    <div style="font:10pt verdana; margin-bottom:1.5em">
        <a href="viewsource.php?file=<?=basename(__FILE__)?>">View Chart Source Code</a>
    </div>
    <!-- ****** Here is the chart image ****** -->
    <?php echo $viewer->renderHTML(); ?>
</body>
</html>