3D Shadow Mode

This example demonstrates an alternative 3D drawing method that uses shadows.

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");

# This script can draw different charts depending on the chartIndex
$chartIndex = (int)($_REQUEST["img"]);

# the tilt angle of the pie
$angle = $chartIndex * 90 + 45;

# The data for the pie chart
$data = array(25, 18, 15, 12, 8, 30, 35);

# Create a PieChart object of size 110 x 110 pixels
$c = new PieChart(110, 110);

# Set the center of the pie at (50, 55) and the radius to 36 pixels
$c->setPieSize(55, 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));
?>