ChartDirector Ver 4.1 (PHP Edition)

Side Label Layout




This method demonstrates the "side label layout" method for positioning the sector labels.

With "side label layout", the sector labels are positioned on the left and right sides of the chart. In contrast, all previous examples use "circular label layout", in which the labels are positioned circularly around the pie.

"Circular label layout" typically uses less space and is the default layout method. However, if the pie chart contains a lot of small sectors, the labels may overlap with each others. It is because there may be insufficient space on the perimeter to position the labels.

"Side label layout" has the advantages that the labels will automatically shift up and down to avoid overlapping. By default, the labels are joined to the sectors with join lines.

The label layout method to use is specified with PieChart.setLabelLayout.

Source Code Listing

[File: phpdemo/sidelabelpie.php]
<?php
require_once("../lib/phpchartdir.php");

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

# The labels for the pie chart
$labels = array("Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities",
    "Production");

# Create a PieChart object of size 500 x 230 pixels
$c = new PieChart(500, 230);

# Set the center of the pie at (250, 120) and the radius to 100 pixels
$c->setPieSize(250, 120, 100);

# Add a title box using 15 points Times Bold Italic as font
$c->addTitle("Project Cost Breakdown", "timesbi.ttf", 15);

# Draw the pie in 3D
$c->set3D();

# Use the side label layout method
$c->setLabelLayout(SideLayout);

# Set the pie data and the pie labels
$c->setData($data, $labels);

# output the chart
header("Content-type: image/png");
print($c->makeChart2(PNG));
?>