Circular Bar Meter (2)

[File: phpdemo/circularbarmeter2.php]
<?php
require_once("../lib/phpchartdir.php");

function createChart($viewer, $chartIndex)
{
    # The value to display on the meter
    $value = 85;

    # 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);

    # In this example, the circular bar has 20 segments
    $segmentCount = 20;

    # The angular step
    $angleStep = 360.0 / $segmentCount;

    # The gap between segments is 4.5 degrees
    $angleGap = 4.5;

    #
    # This example demonstrates several coloring styles
    #

    # Thd default fill and blank colors
    $fillColor = 0x336699;
    $blankColor = 0xeeeeee;

    if ($chartIndex >= 4) {
        # Use dark background style
        $m->setColors(whiteOnBlackPalette());
        $fillColor = 0x6699ff;
        $blankColor = 0x222222;
    }

    if ($chartIndex % 4 == 1) {
        # Alternative fill color
        $fillColor = 0x00ee33;
    } else if ($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)(
            $m->getHeight() / 2), -$angleGap / 2, 360 - $angleGap / 2, $radius, $radius - 20,
            $stepColorScale);
    }

    #
    # Now we draw the segments of the bar meter
    #

    # The segment that contains the value
    $currentSegment = (int)($angle / $angleStep);

    # Segments after the current segment is colored with the blank color
    for($i = $currentSegment + 1; $i < $segmentCount; ++$i) {
        $m->addRingSector($radius, $radius - 20, $i * $angleStep, ($i + 1) * $angleStep - $angleGap,
            $blankColor);
    }

    # Segments before the current segment is colored with the fill color
    for($i = 0; $i < $currentSegment; ++$i) {
        $m->addRingSector($radius, $radius - 20, $i * $angleStep, ($i + 1) * $angleStep - $angleGap,
            $fillColor);
    }

    # Segment that contains the angle will be partially filled and partially blank. We need to
    # adjust the angle to compensated for the angle gap.
    $adjustedAngle = $currentSegment * $angleStep + ($angle - $currentSegment * $angleStep) * (1 -
        $angleGap / $angleStep);

    # The blank part of the segment
    if (($currentSegment + 1) * $angleStep > $angle) {
        $m->addRingSector($radius, $radius - 20, $adjustedAngle, ($currentSegment + 1) * $angleStep
             - $angleGap, $blankColor);
    }

    # The filled part of the segment.
    if ($angle > $currentSegment * $angleStep) {
        $m->addRingSector($radius, $radius - 20, $currentSegment * $angleStep, $adjustedAngle,
            $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 (2)</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 (2)
    </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>