/**
* Returns the x and y position of the label, relative to centre
*/
protected function GetLabelPosition($item, $a_start, $a_end, $rx, $ry, $text)
{
list($xt, $yt) = parent::GetLabelPosition($item, $a_start, $a_end, $rx, $ry, $text);
// get explode wants final angle
$a_start += $this->s_angle;
$a_end += $this->s_angle;
list($xo, $yo) = $this->GetExplode($item, $a_start, $a_end);
return array($xt + $xo, $yt + $yo);
}