ChartDirector 7.0 (PHP Edition)

Custom Scatter Labels




This example demonstrates adding custom labels to data points.

Source Code Listing

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

# The XY points for the scatter chart
$dataX = array(150, 400, 300, 1500, 800);
$dataY = array(0.6, 8, 5.4, 2, 4);

# The labels for the points
$labels = array("Nano\n100", "SpeedTron\n200 Lite", "SpeedTron\n200", "Marathon\nExtra",
    "Marathon\n2000");

# Create a XYChart object of size 450 x 400 pixels
$c = new XYChart(450, 400);

# Set the plotarea at (55, 40) and of size 350 x 300 pixels, with a light grey border (0xc0c0c0).
# Turn on both horizontal and vertical grid lines with light grey color (0xc0c0c0)
$c->setPlotArea(55, 40, 350, 300, 0xffffff, -1, 0xc0c0c0, 0xc0c0c0, -1);

# Add a title to the chart using 18pt Times Bold Itatic font.
$c->addTitle("Product Comparison Chart", "Times New Roman Bold Italic", 18);

# Add a title to the y axis using 12pt Arial Bold Italic font
$c->yAxis->setTitle("Capacity (tons)", "Arial Bold Italic", 12);

# Add a title to the x axis using 12pt Arial Bold Italic font
$c->xAxis->setTitle("Range (miles)", "Arial Bold Italic", 12);

# Set the axes line width to 3 pixels
$c->xAxis->setWidth(3);
$c->yAxis->setWidth(3);

# Add the data as a scatter chart layer, using a 15 pixel circle as the symbol
$layer = $c->addScatterLayer($dataX, $dataY, "", GlassSphereShape, 15, 0xff3333, 0xff3333);

# Add labels to the chart as an extra field
$layer->addExtraField($labels);

# Set the data label format to display the extra field
$layer->setDataLabelFormat("{field0}");

# Use 8pt Arial Bold to display the labels
$textbox = $layer->setDataLabelStyle("Arial Bold", 8);

# Set the background to purple with a 1 pixel 3D border
$textbox->setBackground(0xcc99ff, Transparent, 1);

# Put the text box 4 pixels to the right of the data point
$textbox->setAlignment(Left);
$textbox->setPos(4, 0);

# Output the chart
$viewer = new WebChartViewer("chart1");
$viewer->setChart($c, SVG);

# Include tool tip for the chart
$viewer->setImageMap($c->getHTMLImageMap("", "",
    "title='Range = {x} miles, Capacity = {value} tons'"));
?>

<!DOCTYPE html>
<html>
<head>
    <title>Custom Scatter Labels</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;">
        Custom Scatter Labels
    </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>