contourlegend.php
Back to Chart Graphics
<![CDATA[
<?php
require_once("../lib/phpchartdir.php");
# The x and y coordinates of the grid
$dataX = array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
$dataY = array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
# Use random numbers for the z values on the XY grid
$r = new RanSeries(999);
$dataZ = $r->get2DSeries(count($dataX), count($dataY), -0.9, 1.15);
# Create a XYChart object of size 640 x 460 pixels
$c = new XYChart(640, 460);
# Set the plotarea at (30, 25) and of size 400 x 400 pixels. Use semi-transparent grey (0xdd000000)
# horizontal and vertical grid lines
$c->setPlotArea(50, 25, 400, 400, -1, -1, Transparent, 0xdd000000, -1);
# Set the x and y axis stems to transparent and the label font to 12pt Arial
$c->xAxis->setColors(Transparent);
$c->yAxis->setColors(Transparent);
$c->xAxis->setLabelStyle("Arial", 12);
$c->yAxis->setLabelStyle("Arial", 12);
# Set the x-axis and y-axis scale
$c->xAxis->setLinearScale(0, 10, 1);
$c->yAxis->setLinearScale(0, 10, 1);
# Add a contour layer using the given data
$layer = $c->addContourLayer($dataX, $dataY, $dataZ);
# Move the grid lines in front of the contour layer
$c->getPlotArea()->moveGridBefore($layer);
# Define the color scale
$colorScale = array(-0.8, 0x0066ff, -0.5, 0x66ccff, -0.3, 0x66ffff, 0, 0x88ff88, 0.4, 0x00ff00, 0.7,
0xffff00, 0.9, 0xff6600, 1.0, 0xcc0000, 1.1);
# Apply the color scale, and specify the underflow and overflow colors for regions exceeding the
# color scale
$layer->colorAxis->setColorScale($colorScale, 0x0000cc, 0x000000);
#
# Instead of displaying the color axis, we use a legend box to display the colors. This is useful
# for colors that are unevenly spaced on the color axis.
#
# Add a legend box at (460, 25) with vertical layout, with 12pt Arial font, transparent background
# and border, icon size of 15 x 15 pixels, and line spacing of 8 pixels.
$b = $c->addLegend(460, 25, true, "Arial", 12);
$b->setBackground(Transparent, Transparent);
$b->setKeySize(15, 15);
$b->setKeySpacing(0, 8);
# Add the legend box entries
$b->addKey("> 1.1 (Critical)", 0x000000);
$b->addKey("1.0 to 1.1 (Alert)", 0xcc0000);
$b->addKey("0.9 to 1.0", 0xff6600);
$b->addKey("0.7 to 0.9", 0xffff00);
$b->addKey("0.4 to 0.7", 0x00ff00);
$b->addKey("0.0 to 0.4", 0x88ff88);
$b->addKey("-0.3 to 0.0", 0x66ffff);
$b->addKey("-0.5 to -0.3", 0x66ccff);
$b->addKey("-0.8 to -0.5", 0x0066ff);
$b->addKey("< -0.8", 0x0000cc);
# Output the chart
$viewer = new WebChartViewer("chart1");
$viewer->setChart($c, SVG);
# Include tool tip for the chart
$viewer->setImageMap($c->getHTMLImageMap("", "",
"title='<*cdml*>X: {x|2}<*br*>Y: {y|2}<*br*>Z: {z|2}'"));
# Output Javascript chart model to support contour chart tooltips
$viewer->setChartModel($c->getJsChartModel());
?>
<!DOCTYPE html>
<html>
<head>
<title>Contour Color Legend</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;">
Contour Color Legend
</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>
]]>