ChartDirector Ver 5.0 (PHP Edition)

Concentric Donut Chart

This example demonstrates creating concentric donut chart by merging two donuts of different radii.
The chart in this example is created as two separate PieChart objects. The first PieChart represents the outer donut chart and the overall structure of the chart (such as the legend box, chart title, etc). The second PieChart has a Transparent background and represents the inner donut chart. The two charts are merged together by using the DrawArea.merge method.

Source Code Listing

[File: phpdemo/concentric.php]

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

    # Data for outer ring
    $data = array(88, 124, 96);

    # Data for inner ring
    $data2 = array(77, 87, 45);

    # Labels for the sectors
    $labels = array("Hardware", "Software", "Services");

    # Colors for the sectors
    $colors = array(0xff9999, 0x9999ff, 0x66ff66);

    #
    # Create the main chart, which contains the chart title, the outer ring, and the
    # legend box
    #

    # Create a PieChart object of size 450 x 360 pixels, with transparent background
    $c = new PieChart(450, 360);

    # Add a title to the chart with 18pts Times Bold Italic font
    $c->addTitle("Concentric Donut Chart", "timesbi.ttf", 18);

    # Set donut center at (160, 200), and outer/inner radii as 150/100 pixels
    $c->setDonutSize(160, 200, 150, 100);

    # Add a label at the bottom-right corner of the ring to label the outer ring Use
    # 12pts Arial Bold Italic font in white (ffffff) color, on a green (008800)
    # background, with soft lighting effect and 5 pixels rounded corners
    $t = $c->addText(260, 300, " Year 2006 ", "arialbi.ttf", 12, 0xffffff);
    $t->setBackground(0x008800, Transparent, softLighting());
    $t->setRoundedCorners(5);

    # Set the legend box at (320, 50) with 12 pts Arial Bold Italic font, with no border
    $legendObj = $c->addLegend(320, 50, true, "arialbi.ttf", 13);
    $legendObj->setBackground(Transparent, Transparent);

    # Set the pie data and the pie labels
    $c->setData($data, $labels);

    # Set the pie colors
    $c->setColors2(DataColor, $colors);

    # Set pie border color to white (ffffff)
    $c->setLineColor(0xffffff);

    # Set pie label to value in $###M format, percentage in (##.#%) format, in two lines.
    $c->setLabelFormat("\${value}M<*br*>({percent|1}%)");

    # Use 10pts Airal Bold for the sector labels
    $c->setLabelStyle("arialbd.ttf", 10);

    # Set the label position to -25 pixels from the sector (which would be internal to
    # the sector)
    $c->setLabelPos(-25);

    #
    # Create the inner ring.
    #

    # Create a PieChart object of size 280 x 320 pixels, with transparent background
    $c2 = new PieChart(280, 320, Transparent);

    # Set donut center at (110, 110), and outer/inner radii as 100/50 pixels
    $c2->setDonutSize(110, 110, 100, 50);

    # Add a label at the center of the ring to label the inner ring. Use 12pts Arial Bold
    # Italic font in white (ffffff) color, on a deep blue (0000cc) background, with soft
    # lighting effect and 5 pixels rounded corners
    $t2 = $c2->addText(110, 110, " Year 2005 ", "arialbi.ttf", 12, 0xffffff, Center);
    $t2->setBackground(0x0000cc, Transparent, softLighting());
    $t2->setRoundedCorners(5);

    # Set the pie data and the pie labels
    $c2->setData($data2, $labels);

    # Set the pie colors
    $c2->setColors2(DataColor, $colors);

    # Set pie border color to white (ffffff)
    $c2->setLineColor(0xffffff);

    # Set pie label to value in $###M format, percentage in (##.#%) format, in two lines.
    $c2->setLabelFormat("\${value}M<*br*>({percent|1}%)");

    # Use 10pts Airal Bold for the sector labels
    $c2->setLabelStyle("arialbd.ttf", 10);

    # Set the label position to -25 pixels from the sector (which would be internal to
    # the sector)
    $c2->setLabelPos(-25);

    # merge the inner ring into the outer ring at (50, 90)
    $makeChartObj = $c->makeChart3();
    $makeChartObj->merge($c2->makeChart3(), 50, 90, TopLeft, 0);

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

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