ChartDirector Ver 5.0 (PHP Edition)

Simple Rose Chart

This example demonstrates how to create a rose chart.
A rose chart is basically a polar chart with sectors of variable radius. This can be achieved by creating a PolarChart object as the graph paper, and adding sector zones on it using AngularAxis.addZone.
To enable auto-scale of the axis, in this example, we also add the radius data to a transparent line layer using PolarChart.addLineLayer. The line layer has no visible effect, but it causes the radial axis to auto-scale so that it covers the radius data.

Source Code Listing

[File: phpdemo/rose.php]

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

    # Data for the chart
    $data = array(9.4, 1.8, 2.1, 2.3, 3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3, 5.1, 2.6,
        1.5, 2.2, 5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5);
    $angles = array(0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210,
        225, 240, 255, 270, 285, 300, 315, 330, 345);

    # Create a PolarChart object of size 460 x 460 pixels, with a silver background and a
    # 1 pixel 3D border
    $c = new PolarChart(460, 460, silverColor(), 0x000000, 1);

    # Add a title to the chart at the top left corner using 15pts Arial Bold Italic font.
    # Use white text on deep blue background.
    $textBoxObj = $c->addTitle("Polar Vector Chart Demonstration", "arialbi.ttf", 15,
        0xffffff);
    $textBoxObj->setBackground(0x000080);

    # Set plot area center at (230, 240) with radius 180 pixels and white background
    $c->setPlotArea(230, 240, 180, 0xffffff);

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

    # Set angular axis as 0 - 360, with a spoke every 30 units
    $c->angularAxis->setLinearScale(0, 360, 30);

    # Add sectors to the chart as sector zones
    for($i = 0; $i < count($data); ++$i) {
        $c->angularAxis->addZone($angles[$i], $angles[$i] + 15, 0, $data[$i], 0x33ff33,
            0x008000);
    }

    # Add an Transparent invisible layer to ensure the axis is auto-scaled using the data
    $c->addLineLayer($data, Transparent);

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

© 2009 Advanced Software Engineering Limited. All rights reserved.