private function runGenerateFactorPieChart($w, $h, $factor, $file)
{
$chart = new PieChart($w, $h);
foreach ($this->mitgliederFactorCount[$factor] as $label => $count) {
if (!empty($label)) {
$chart->addData(new Chart_Data($label, $count));
}
}
$chart->plot($file);
}
