ChartDirector Ver 3.1 (PHP Edition 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 18 pts Times Bold Itatic font. $c->addTitle("Product Comparison Chart", "timesbi.ttf", 18); #Add a title to the y axis using 12 pts Arial Bold Italic font $c->yAxis->setTitle("Capacity (tons)", "arialbi.ttf", 12); #Add a title to the x axis using 12 pts Arial Bold Italic font $c->xAxis->setTitle("Range (miles)", "arialbi.ttf", 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, "Server BBB", CircleSymbol, 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 8pts Arial Bold to display the labels $textbox = $layer->setDataLabelStyle("arialbd.ttf", 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); $textbox->setPos(4, 0); #output the chart header("Content-type: image/png"); print($c->makeChart2(PNG)); ?>