ChartDirector Ver 5.0 (PHP Edition)

Polar Spline Chart

This example demonstrates polar spline line and polar spline area.
The polar spline line is created using PolarChart.addSplineLineLayer. The polar spline area is created using PolarChart.addSplineAreaLayer.

Source Code Listing

[File: phpdemo/polarspline.php]

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

    # The data for the chart
    $data0 = array(5.1, 2.6, 1.5, 2.2, 5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5, 9.4, 1.8,
        2.1, 2.3, 3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3);
    $angles0 = 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);

    $data1 = array(8.1, 2.5, 5, 5.2, 6.5, 8.5, 9, 7.6, 8.7, 6.4, 5.5, 5.4, 3.0, 8.7, 7.1,
        8.8, 7.9, 2.2, 5.0, 4.0, 1.5, 7.5, 8.3, 9.0);
    $angles1 = 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
    $c = new PolarChart(460, 460);

    # Add a title to the chart at the top left corner using 15pts Arial Bold Italic font
    $c->addTitle2(TopLeft, "<*underline=2*>EM Field Strength", "arialbi.ttf", 15);

    # Set center of plot area at (230, 240) with radius 180 pixels
    $c->setPlotArea(230, 240, 180);

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

    # Add a legend box at the top right corner of the chart using 9 pts Arial Bold font
    $legendObj = $c->addLegend(459, 0, true, "arialbd.ttf", 9);
    $legendObj->setAlignment(TopRight);

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

    # Add a red (0xff9999) spline area layer to the chart using (data0, angles0)
    $splineAreaLayerObj = $c->addSplineAreaLayer($data0, 0xff9999, "Above 100MHz");
    $splineAreaLayerObj->setAngles($angles0);

    # Add a blue (0xff) spline line layer to the chart using (data1, angle1)
    $layer1 = $c->addSplineLineLayer($data1, 0x0000ff, "Below 100MHz");
    $layer1->setAngles($angles1);

    # Set the line width to 3 pixels
    $layer1->setLineWidth(3);

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

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