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: perldemo/shadowpie.pl] (The CGI version is available as "perldemo_cgi/shadowpie.pl".)
#!/usr/bin/perl
use perlchartdir;
sub createChart
{
my $img = shift;
#the tilt angle of the pie
my $angle = $img * 90 + 45;
#The data for the pie chart
my $data = [25, 18, 15, 12, 8, 30, 35];
#Create a PieChart object of size 100 x 110 pixels
my $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, 1);
#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, $perlchartdir::Transparent);
#output the chart
$c->makeChart("shadowpie$img.png")
}
createChart(0);
createChart(1);
createChart(2);
createChart(3);
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