Example:
//Instantiating a Workbook object
$workbook = new cells\Workbook();
//Obtaining the reference of the first worksheet
$worksheet = $workbook->getWorksheets()->get(0);
//Adding a sample value to "A1" cell
$worksheet->getCells()->get("A1")->putValue(50);
//Adding a sample value to "A2" cell
$worksheet->getCells()->get("A2")->putValue(100);
//Adding a sample value to "A3" cell
$worksheet->getCells()->get("A3")->putValue(150);
//Adding a sample value to "B1" cell
$worksheet->getCells()->get("B1")->putValue(60);
//Adding a sample value to "B2" cell
$worksheet->getCells()->get("B2")->putValue(32);
//Adding a sample value to "B3" cell
$worksheet->getCells()->get("B3")->putValue(50);
//Adding a chart to the worksheet
$chartIndex = $worksheet->getCharts()->add(cells\ChartType::PIE_EXPLODED, 5, 0, 25, 10);
//Accessing the instance of the newly added chart
$chart = $worksheet->getCharts()->get($chartIndex);
//Adding NSeries (chart data source) to the chart ranging from "A1" cell to "B3"
$chart->getNSeries()->add("A1:B3", true);
//Show Data Labels
$chart->getNSeries()->get(0)->getDataLabels()->setValueShown(true);
$points = $chart->getNSeries()->get(0)->getPoints();
for ($i = 0; $i < java_values($points->getCount()); $i++)
{
//Get Data Point
$point = $points->get($i);
//Set Pir Explosion
$point->setExplosion(15);
//Set Border Color
$point->getBorder()->setColor(cells\Color::getRed());
}