Black Semicircle Meters

[File: phpdemo/blacksemicirclemeter.php]
<?php
require_once("../lib/phpchartdir.php");

function createChart($viewer, $chartIndex)
{
    # The value to display on the meter
    $value = 72.55;

    # Create an AngularMeter object of size 300 x 180 pixels with transparent background
    $m = new AngularMeter(300, 180, Transparent);

    # Set the default text and line colors to white (0xffffff)
    $m->setColor(TextColor, 0xffffff);
    $m->setColor(LineColor, 0xffffff);

    # Center at (150, 150), scale radius = 128 pixels, scale angle -90 to +90 degrees
    $m->setMeter(150, 150, 128, -90, 90);

    # Gradient color for the border to make it silver-like
    $ringGradient = array(1, 0x909090, 0.5, 0xd6d6d6, 0, 0xeeeeee, -0.5, 0xd6d6d6, -1, 0x909090);

    # Add a black (0x000000) scale background of 148 pixels radius with a 10 pixel thick silver
    # border
    $m->addScaleBackground(148, 0, 10, $m->relativeLinearGradient($ringGradient, 45, 148));

    # Meter scale is 0 - 100, with major tick every 20 units, minor tick every 10 units, and micro
    # tick every 5 units
    $m->setScale(0, 100, 20, 10, 5);

    # Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to
    # 16/16/10 pixels pointing inwards, and their widths to 2/1/1 pixels.
    $m->setLabelStyle("Arial Italic", 16);
    $m->setTickLength(-16, -16, -10);
    $m->setLineWidth(0, 2, 1, 1);

    # Demostrate different types of color scales and putting them at different positions
    $smoothColorScale = array(0, 0x0000ff, 25, 0x0088ff, 50, 0x00ff00, 75, 0xdddd00, 100, 0xff0000);
    $stepColorScale = array(0, 0x00aa00, 60, 0xddaa00, 80, 0xcc0000, 100);
    $highLowColorScale = array(0, 0x00ff00, 70, Transparent, 100, 0xff0000);

    if ($chartIndex == 0) {
        # Add the smooth color scale at the default position
        $m->addColorScale($smoothColorScale);
    } else if ($chartIndex == 1) {
        # Add the smooth color scale starting at radius 128 with zero width and ending at radius 128
        # with 16 pixels inner width
        $m->addColorScale($smoothColorScale, 128, 0, 128, -16);
    } else if ($chartIndex == 2) {
        # Add the smooth color scale starting at radius 70 with zero width and ending at radius 60
        # with 20 pixels outer width
        $m->addColorScale($smoothColorScale, 70, 0, 60, 20);
    } else if ($chartIndex == 3) {
        # Add the high/low color scale at the default position
        $m->addColorScale($highLowColorScale);
    } else if ($chartIndex == 4) {
        # Add the step color scale at the default position
        $m->addColorScale($stepColorScale);
    } else {
        # Add the smooth color scale at radius 60 with 15 pixels outer width
        $m->addColorScale($smoothColorScale, 60, 15);
    }

    # Add a text label centered at (150, 125) with 15pt Arial Italic font
    $m->addText(150, 125, "CPU", "Arial Italic", 15, TextColor, BottomCenter);

    # Add a red (0xff0000) pointer at the specified value
    $m->addPointer2($value, 0xff0000);

    # Add glare up to radius 138 (= region inside border)
    if ($chartIndex % 2 == 0) {
        $m->addGlare(138);
    }

    # Output the chart
    $viewer->setChart($m, SVG);
}

# This example includes 6 charts
$viewers = array();
for ($i = 0; $i < 6; ++$i) {
    $viewers[$i] = new WebChartViewer("chart$i");
    createChart($viewers[$i], $i);
}
?>

<!DOCTYPE html>
<html>
<head>
    <title>Black Semicircle Meters</title>
    <!-- Include ChartDirector Javascript Library to support chart interactions -->
    <script type="text/javascript" src="cdjcv.js"></script>
</head>
<body style="margin:5px 0px 0px 5px">
    <div style="font:bold 18pt verdana;">
        Black Semicircle Meters
    </div>
    <hr style="border:solid 1px #000080; background:#000080" />
    <div style="font:10pt verdana; margin-bottom:1.5em">
        <a href="viewsource.php?file=<?=basename(__FILE__)?>">View Chart Source Code</a>
    </div>
    <!-- ****** Here are the chart images ****** -->
    <?php
        for ($i = 0; $i < count($viewers); ++$i) {
            echo $viewers[$i]->renderHTML(), " ";
        }
    ?>
</body>
</html>