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>