The standard way to draw a pie chart in 3D is to view the chart from an inclined angle. Using this method, the surface of a 3D pie will become an ellipse.

ChartDirector supports an alternative way to draw a pie chart in 3D - to draw the 3D portion like a shadow. The 3D pie will remain perfectly circular, and the sector areas will correctly reflect its percentages.

The 3D drawing method is configured using PieChart.set3D.

[File: phpdemo/shadowpie.php".]

<?php require_once("../lib/phpchartdir.php"); #the tilt angle of the pie $angle = $HTTP_GET_VARS["img"] * 90 + 45; #The data for the pie chart $data = array(25, 18, 15, 12, 8, 30, 35); #Create a PieChart object of size 100 x 110 pixels $c = new PieChart(100, 110); #Set the center of the pie at (50, 55) and the radius to 36 pixels $c->setPieSize(50, 55, 36); #Set the depth, tilt angle and 3D mode of the 3D pie (-1 means auto depth, #"true" means the 3D effect is in shadow mode) $c->set3D(-1, $angle, true); #Add a title showing the shadow angle $c->addTitle("Shadow @ $angle deg", "arial.ttf", 8); #Set the pie data $c->setData($data); #Disable the sector labels by setting the color to Transparent $c->setLabelStyle("", 8, Transparent); #output the chart header("Content-type: image/png"); print($c->makeChart2(PNG)); ?>