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.
[Standalone Version] perldemo\shadowpie.pl
#!/usr/bin/perl
use perlchartdir;
sub createChart
{
my $img = shift;
# the tilt angle of the pie
my $angle = int($img) * 90 + 45;
# The data for the pie chart
my $data = [25, 18, 15, 12, 8, 30, 35];
# Create a PieChart object of size 110 x 110 pixels
my $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, 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); |
[CGI Version] perldemo_cgi\shadowpie.pl
#!/usr/bin/perl
# Include current script directory in the module path (needed on Microsoft IIS).
# This allows this script to work by copying ChartDirector to the same directory
# as the script (as an alternative to installation in Perl module directory)
use File::Basename;
use lib dirname($0) =~ /(.*)/;
use perlchartdir;
# Get HTTP query parameters
use CGI;
my $query = new CGI;
# the tilt angle of the pie
my $angle = int($query->param("img")) * 90 + 45;
# The data for the pie chart
my $data = [25, 18, 15, 12, 8, 30, 35];
# Create a PieChart object of size 110 x 110 pixels
my $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, 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
binmode(STDOUT);
print "Content-type: image/png\n\n";
print $c->makeChart2($perlchartdir::PNG); |
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