/**
* Calculates reduced radius of pie
*/
protected function Calc()
{
parent::Calc();
$this->explode_amount = min($this->radius_x - 10, $this->radius_y - 10, max(2, (int) $this->explode_amount));
$this->radius_y -= $this->explode_amount;
$this->radius_x -= $this->explode_amount;
}
/**
* Sets up the polar graph details
*/
protected function Calc()
{
// no sorting, no percentage
$this->sort = false;
$this->show_label_percent = false;
parent::Calc();
$smax = sqrt($this->GetMaxValue());
$this->radius_factor_x = $this->radius_x / $smax;
$this->radius_factor_y = $this->radius_y / $smax;
$this->slice_angle = 2.0 * M_PI / ($this->GetMaxKey() + 1);
}