ChartDirector Ver 4.1 (PHP Edition Edition)

Linear Zone Meter

This example demonstrates a linear meter which is labelled with zones.
The above meter is achieved by using LinearMeter.addZone to add labelled zone. The black lines separating the zones are added by using BaseMeter.addLabel with empty spaces as labels.

Source Code Listing

[File: phpdemo/linearzonemeter.php]

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

    # The value to display on the meter
    $value = 85;

    # Create an LinearMeter object of size 210 x 45 pixels, using silver background with
    # a 2 pixel black 3D depressed border.
    $m = new LinearMeter(210, 45, silverColor(), 0, -2);

    # Set the scale region top-left corner at (5, 5), with size of 200 x 20 pixels. The
    # scale labels are located on the bottom (implies horizontal meter)
    $m->setMeter(5, 5, 200, 20, Bottom);

    # Set meter scale from 0 - 100
    $m->setScale(0, 100);

    # Add a title at the bottom of the meter with a 1 pixel raised 3D border
    $textBoxObj = $m->addTitle2(Bottom, "Battery Level", "arialbd.ttf", 8);
    $textBoxObj->setBackground(Transparent, -1, 1);

    # Set 3 zones of different colors to represent Good/Weak/Bad data ranges
    $m->addZone(50, 100, 0x99ff99, "Good");
    $m->addZone(20, 50, 0xffff66, "Weak");
    $m->addZone(0, 20, 0xffcccc, "Bad");

    # Add empty labels (just need the ticks) at 0/20/50/80 as separators for zones
    $m->addLabel(0, " ");
    $m->addLabel(20, " ");
    $m->addLabel(50, " ");
    $m->addLabel(100, " ");

    # Add a semi-transparent blue (800000ff) pointer at the specified value, using
    # triangular pointer shape
    $pointerObj = $m->addPointer($value, 0x800000ff);
    $pointerObj->setShape(TriangularPointer);

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

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