private function _isInTolerance($basePointIndex, $subjectPointIndex)
    {
        $radius = $this->distanceBetweenPoints(
            $this->points[$basePointIndex],
            $this->points[$subjectPointIndex]
        );
        return $radius < $this->_tolerance;
    }
private function _isInTolerance($basePointIndex, $subjectPointIndex)
    {
        $radius = $this->distanceBetweenPoints(
            $this->points[$basePointIndex],
            $this->points[$subjectPointIndex]
        );
        return $radius < $this->_tolerance;
    }
private function _isInTolerance ( $ basePointIndex , $ subjectPointIndex ) { $ radius = $ this -> distanceBetweenPoints ( $ this -> points [ $ basePointIndex ] , $ this -> points [ $ subjectPointIndex ] ) ; return $ radius < $ this -> _tolerance ; }
Helper method to ensure clean code.

@param integer $basePointIndex    Sentinel point index.
@param integer $subjectPointIndex Test point index.

@return bool True if subject point is under tolerance, false otherwise.
Helper method to ensure clean code .