/**
* Reduce number of values in the plot
*
* @param int $number Reduce number of values to $number
*/
public function reduce($number)
{
$count = count($this->datay);
$ratio = ceil($count / $number);
if ($ratio > 1) {
$tmpy = $this->datay;
$datay = array();
$datax = array();
$cbLabel = $this->xAxis->label->getCallbackFunction();
for ($i = 0; $i < $count; $i += $ratio) {
$slice = array_slice($tmpy, $i, $ratio);
$datay[] = array_sum($slice) / count($slice);
// Reduce data on X axis if needed
if ($cbLabel !== NULL) {
$datax[] = $cbLabel($i + round($ratio / 2));
}
}
$this->setValues($datay);
if ($cbLabel !== NULL) {
$this->xAxis->setLabelText($datax);
}
}
}
