private function getPercentage($value)
    {
        $percentage = ($value - $this->min) / ($this->max - $this->min) * 100;

        return $percentage;
    }
private function getPercentage($value)
    {
        $percentage = ($value - $this->min) / ($this->max - $this->min) * 100;

        return $percentage;
    }
private function getPercentage ( $ value ) { $ percentage = ( $ value - $ this -> min ) / ( $ this -> max - $ this -> min ) * 100 ; return $ percentage ; }
Return the percentage in the range between min and max for this chart

@param number $value
@return float
Return the percentage in the range between min and max for this chart