Black Round Meters

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

function createChart($viewer, $chartIndex)
{
    # The value to display on the meter
    $value = 72.3;

    # Create an AngularMeter object of size 250 x 250 pixels with transparent background
    $m = new AngularMeter(250, 250, Transparent);

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

    # Demonstration two different meter scale angles
    if ($chartIndex % 2 == 0) {
        # Center at (125, 125), scale radius = 111 pixels, scale angle -140 to +140 degrees
        $m->setMeter(125, 125, 111, -140, 140);
    } else {
        # Center at (125, 125), scale radius = 111 pixels, scale angle -180 to +90 degrees
         $m->setMeter(125, 125, 111, -180, 90);
    }

    # Add a black (0x000000) circle with radius 123 pixels as background
    $m->addRing(0, 123, 0x000000);

    # Gradient color for the border to make it silver-like
    $ringGradient = array(1, 0x7f7f7f, 0.5, 0xd6d6d6, 0, 0xffffff, -0.5, 0xd6d6d6, -1, 0x7f7f7f);
    # Add a ring between radii 116 and 122 pixels using the silver gradient as border
    $m->addRing(116, 122, $m->relativeLinearGradient($ringGradient, 45, 122));

    # Meter scale is 0 - 100, with major/minor/micro ticks every 10/5/1 units
    $m->setScale(0, 100, 10, 5, 1);

    # Set the scale label style to 15pt Arial Italic. Set the major/minor/micro tick lengths to
    # 12/9/6 pixels pointing inwards, and their widths to 2/1/1 pixels.
    $m->setLabelStyle("Arial Italic", 15);
    $m->setTickLength(-12, -9, -6);
    $m->setLineWidth(0, 2, 1, 1);

    # Demostrate different types of color scales and glare effects 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);
        # Add glare up to radius 116 (= region inside border)
        $m->addGlare(116);
    } else if ($chartIndex == 1) {
        # Add the smooth color scale starting at radius 62 with zero width and ending at radius 40
        # with 22 pixels outer width
        $m->addColorScale($smoothColorScale, 62, 0, 40, 22);
        # Add glare up to radius 116 (= region inside border), concave and spanning 190 degrees
        $m->addGlare(116, -190);
    } else if ($chartIndex == 2) {
        # Add the smooth color scale starting at radius 111 with zero width and ending at radius 111
        # with 12 pixels inner width
        $m->addColorScale($smoothColorScale, 111, 0, 111, -12);
        # Add glare up to radius 116 (= region inside border), concave and spanning 190 degrees and
        # rotated by 45 degrees
        $m->addGlare(116, -190, 45);
    } else if ($chartIndex == 3) {
        # Add the high/low color scale at the default position
        $m->addColorScale($highLowColorScale);
    } else if ($chartIndex == 4) {
        # Add the smooth color scale at radius 44 with 16 pixels outer width
        $m->addColorScale($smoothColorScale, 44, 16);
        # Add glare up to radius 116 (= region inside border), concave and spanning 190 degrees and
        # rotated by -45 degrees
        $m->addGlare(116, -190, -45);
    } else {
        # Add the step color scale at the default position
        $m->addColorScale($stepColorScale);
    }

    # Add a text label centered at (125, 175) with 15pt Arial Italic font
    $m->addText(125, 175, "CPU", "Arial Italic", 15, TextColor, Center);

    # Add a readout to some of the charts as demonstration
    if (($chartIndex == 0) || ($chartIndex == 2)) {
        # Put the value label center aligned at (125, 232), using black (0x000000) 14pt Arial font
        # on a light blue (0x99ccff) background. Set box width to 50 pixels with 5 pixels rounded
        # corners.
        $t = $m->addText(125, 232, $m->formatValue($value,
            "<*block,width=50,halign=center*>{value|1}"), "Arial", 14, 0x000000, BottomCenter);
        $t->setBackground(0x99ccff);
        $t->setRoundedCorners(5);
    }

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

    # 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 Round 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 Round 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>