ChartDirector Ver 4.1 (PHP Edition Edition)

Log Scale Axis

This example demonstrates using a log scale axis versus a linear scale axis.
In ChartDirector, log scale axis can be configured using Axis.setLogScale, Axis.setLogScale2 or Axis.setLogScale3.

Source Code Listing

[File: phpdemo/logaxis.php]

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

    # The data for the chart
    $data = array(100, 125, 260, 147, 67);
    $labels = array("Mon", "Tue", "Wed", "Thu", "Fri");

    # Create a XYChart object of size 200 x 180 pixels
    $c = new XYChart(200, 180);

    # Set the plot area at (30, 10) and of size 140 x 130 pixels
    $c->setPlotArea(30, 10, 140, 130);

    # Ise log scale axis if required
    if ($_REQUEST["img"] == "1") {
        $c->yAxis->setLogScale3();
    }

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

    # Add a color bar layer using the given data. Use a 1 pixel 3D border for the bars.
    $barLayerObj = $c->addBarLayer3($data);
    $barLayerObj->setBorderColor(-1, 1);

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

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