private function _distance( $out, $key )
    {
        return $this->distanceBetweenPoints(
            $this->points[$out],
            $this->points[$key]
        );
    }
private function _distance( $out, $key )
    {
        return $this->distanceBetweenPoints(
            $this->points[$out],
            $this->points[$key]
        );
    }
private function _distance ( $ out , $ key ) { return $ this -> distanceBetweenPoints ( $ this -> points [ $ out ] , $ this -> points [ $ key ] ) ; }
Short-cut function for distanceBetweenPoints method

@param integer $out Test point-index
@param integer $key Index point-index (what???)

@return double
Short - cut function for distanceBetweenPoints method