confidenceband.php
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<![CDATA[
<?php
require_once("../lib/phpchartdir.php");
# The XY data of the first data series
$dataX = array(50, 55, 37, 24, 42, 49, 63, 72, 83, 59);
$dataY = array(3.6, 2.8, 2.5, 2.3, 3.8, 3.0, 3.8, 5.0, 6.0, 3.3);
# Create a XYChart object of size 450 x 420 pixels
$c = new XYChart(450, 420);
# Set the plotarea at (55, 65) and of size 350 x 300 pixels, with white background and a light grey
# border (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
# (0xc0c0c0)
$c->setPlotArea(55, 65, 350, 300, 0xffffff, -1, 0xc0c0c0, 0xc0c0c0, -1);
# Add a title to the chart using 18 point Times Bold Itatic font.
$c->addTitle("Server Performance", "Times New Roman Bold Italic", 18);
# Add titles to the axes using 12pt Arial Bold Italic font
$c->yAxis->setTitle("Response Time (sec)", "Arial Bold Italic", 12);
$c->xAxis->setTitle("Server Load (TPS)", "Arial Bold Italic", 12);
# Set the axes line width to 3 pixels
$c->yAxis->setWidth(3);
$c->xAxis->setWidth(3);
# Add a scatter layer using (dataX, dataY)
$scatterLayer = $c->addScatterLayer($dataX, $dataY, "", DiamondSymbol, 11, 0x008000);
# tool tip for scatter layer
$scatterLayer->setHTMLImageMap("", "", "title='Response time at {x} TPS: {value} sec'");
# Add a trend line layer for (dataX, dataY)
$trendLayer = $c->addTrendLayer2($dataX, $dataY, 0x008000);
# Set the line width to 3 pixels
$trendLayer->setLineWidth(3);
# Add a 95% confidence band for the line
$trendLayer->addConfidenceBand(0.95, 0x806666ff);
# Add a 95% confidence band (prediction band) for the points
$trendLayer->addPredictionBand(0.95, 0x8066ff66);
# tool tip for trend layer
$trendLayer->setHTMLImageMap("", "",
"title='Slope = {slope|4} sec/TPS; Intercept = {intercept|4} sec'");
# Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 10pt Arial Bold Italic
# font. Set the background and border color to Transparent.
$legendBox = $c->addLegend(50, 30, false, "Arial Bold Italic", 10);
$legendBox->setBackground(Transparent);
# Add entries to the legend box
$legendBox->addKey("95% Line Confidence", 0x806666ff);
$legendBox->addKey("95% Point Confidence", 0x8066ff66);
# Display the trend line parameters as a text table formatted using CDML
$textbox = $c->addText(56, 65, sprintf(
"<*block*>Slope\nIntercept\nCorrelation\nStd Error<*/*> <*block*>%.4f sec/tps\n%.4f sec\n".
"%.4f\n%.4f sec<*/*>", $trendLayer->getSlope(), $trendLayer->getIntercept(),
$trendLayer->getCorrelation(), $trendLayer->getStdError()), "Arial Bold", 8);
# Set the background of the text box to light grey, with a black border, and 1 pixel 3D border
$textbox->setBackground(0xc0c0c0, 0, 1);
# Output the chart
$viewer = new WebChartViewer("chart1");
$viewer->setChart($c, SVG);
# include tool tip for the chart
$viewer->setImageMap($c->getHTMLImageMap(""));
?>
<!DOCTYPE html>
<html>
<head>
<title>Confidence Band</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;">
Confidence Band
</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 is the chart image ****** -->
<?php echo $viewer->renderHTML(); ?>
</body>
</html>
]]>