circularbarmeter2.php
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<![CDATA[
<?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>
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