ChartDirector Ver 5.0 (PHP Edition)

Polar Line Chart

This example demonstrates a polar line chart, completed with data symbols and data labels.

- The grid lines in this example is circular (instead of polygonal as is in Simple Radar Chart). This is configured using PolarChart.setGridStyle.
- The angular scale in this example is set to 0 - 360, with spokes every 30 units. This is by using AngularAxis.setLinearScale.
- The two lines in this example is added using PolarChart.addLineLayer with angular coordinates of the points provided by PolarLayer.setAngles.
- The data symbols are enabled using PolarLayer.setDataSymbol.
- The data labels are configured using PolarLayer.setDataLabelFormat to consist of the radial and angular coordinates.
- The data label background colors and 3D borders are configured using PolarLayer.setDataLabelStyle and Box.setBackground.
- Note that the blue line in this example is a closed loop (the default), while the red is not a loop. This is configured by using PolarLineLayer.setCloseLoop.

Source Code Listing

[File: phpdemo/polarline.php]

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

    # The data for the chart
    $data0 = array(90, 25, 40, 55, 68, 44, 79, 85, 50);
    $angles0 = array(15, 60, 110, 180, 230, 260, 260, 310, 340);

    $data1 = array(80, 91, 66, 80, 92, 87);
    $angles1 = array(40, 65, 88, 110, 150, 200);

    # Create a PolarChart object of size 460 x 500 pixels, with a grey (e0e0e0)
    # background and 1 pixel 3D border
    $c = new PolarChart(460, 500, 0xe0e0e0, 0x000000, 1);

    # Add a title to the chart at the top left corner using 15pts Arial Bold Italic font.
    # Use a wood pattern as the title background.
    $textBoxObj = $c->addTitle("Polar Line Chart Demo", "arialbi.ttf", 15);
    $textBoxObj->setBackground($c->patternColor(dirname(__FILE__)."/wood.png"));

    # Set center of plot area at (230, 280) with radius 180 pixels, and white (ffffff)
    # background.
    $c->setPlotArea(230, 280, 180, 0xffffff);

    # Set the grid style to circular grid, with grids below the chart layers
    $c->setGridStyle(false, false);

    # Add a legend box at top-center of plot area (230, 35) using horizontal layout. Use
    # 10 pts Arial Bold font, with 1 pixel 3D border effect.
    $b = $c->addLegend(230, 35, false, "arialbd.ttf", 9);
    $b->setAlignment(TopCenter);
    $b->setBackground(Transparent, Transparent, 1);

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

    # Add a blue (0xff) line layer to the chart using (data0, angle0)
    $layer0 = $c->addLineLayer($data0, 0x0000ff, "Close Loop Line");
    $layer0->setAngles($angles0);

    # Set the line width to 2 pixels
    $layer0->setLineWidth(2);

    # Use 11 pixel triangle symbols for the data points
    $layer0->setDataSymbol(TriangleSymbol, 11);

    # Enable data label and set its format
    $layer0->setDataLabelFormat("({value},{angle})");

    # Set the data label text box with light blue (0x9999ff) backgruond color and 1 pixel
    # 3D border effect
    $textBoxObj = $layer0->setDataLabelStyle();
    $textBoxObj->setBackground(0x9999ff, Transparent, 1);

    # Add a red (0xff0000) line layer to the chart using (data1, angle1)
    $layer1 = $c->addLineLayer($data1, 0xff0000, "Open Loop Line");
    $layer1->setAngles($angles1);

    # Set the line width to 2 pixels
    $layer1->setLineWidth(2);

    # Use 11 pixel diamond symbols for the data points
    $layer1->setDataSymbol(DiamondSymbol, 11);

    # Set the line to open loop
    $layer1->setCloseLoop(false);

    # Enable data label and set its format
    $layer1->setDataLabelFormat("({value},{angle})");

    # Set the data label text box with light red (0xff9999) backgruond color and 1 pixel
    # 3D border effect
    $textBoxObj = $layer1->setDataLabelStyle();
    $textBoxObj->setBackground(0xff9999, Transparent, 1);

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

© 2009 Advanced Software Engineering Limited. All rights reserved.