ChartDirector 7.0 (PHP Edition)

Circular Bar Meter


              

This example demonstrates circular bar meters.

A circular bar meter can be created by using an AngularMeter in a creative way.

Source Code Listing

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

function createChart($viewer, $chartIndex)
{
    # The value to display on the meter
    $value = 77;

    # The meter radius and angle
    $radius = 50;
    $angle = $value * 360.0 / 100;

    # Create an AngularMeter with transparent background
    $m = new AngularMeter($radius * 2 + 10, $radius * 2 + 10, Transparent);

    # Set the center, radius and angular range of the meter
    $m->setMeter((int)($m->getWidth() / 2), (int)($m->getHeight() / 2), $radius, 0, 360);

    # For circular bar meters, we do not need pointer or graduation, so we hide them.
    $m->setMeterColors(Transparent, Transparent, Transparent);
    $m->setCap(0, Transparent);

    #
    # This example demonstrates several coloring styles
    #

    # Thd default fill and blank colors
    $fillColor = 0x6699ff;
    $blankColor = 0xeeeeee;

    if ($chartIndex >= 4) {
        # Use dark background style
        $m->setColors(whiteOnBlackPalette());
        $blankColor = 0x222222;
    }

    if ($chartIndex % 4 == 1) {
        # Alternative fill color
        $fillColor = 0xff6600;
    } else if ($chartIndex % 4 == 2) {
        # Use a smooth color scale as the fill color
        $smoothColorScale = array(0, 0x0022ff, 15, 0x0088ff, 30, 0x00ff00, 55, 0xffff00, 80,
            0xff0000, 100, 0xff0000);
        $fillColor = $m->getDrawArea()->angleGradientColor((int)($m->getWidth() / 2), (int)(
            $m->getHeight() / 2), 0, 360, $radius, $radius - 20, $smoothColorScale);
    } else if ($chartIndex % 4 == 3) {
        # Use a step color scale as the fill color
        $stepColorScale = array(0, 0x0044ff, 20, 0x00ee00, 50, 0xeeee00, 70, 0xee0000, 100);
        $fillColor = $m->getDrawArea()->angleGradientColor((int)($m->getWidth() / 2), (int)(
            $m->getHeight() / 2), 0, 360, $radius, $radius - 20, $stepColorScale);
    }

    # Draw the blank part of the circular bar
    if ($angle < 360) {
        $m->addRingSector($radius, $radius - 20, $angle, 360, $blankColor);
    }

    # Draw the fill part of the circular bar
    if ($angle > 0) {
        $m->addRingSector($radius, $radius - 20, 0, $angle, $fillColor);
    }

    # Add a label at the center to display the value
    $m->addText((int)($m->getWidth() / 2), (int)($m->getHeight() / 2), $m->formatValue($value,
        "{value}"), "Arial", 25, TextColor, Center)->setMargin(0);

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

# This example includes 8 charts
$viewers = array();
for ($i = 0; $i < 8; ++$i) {
    $viewers[$i] = new WebChartViewer("chart$i");
    createChart($viewers[$i], $i);
}
?>

<!DOCTYPE html>
<html>
<head>
    <title>Circular Bar 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;">
        Circular Bar 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>