Returns the percentage the value represents between the minimum and
        maximum for this axis.
        
        :param      value | <int> || <float>
        
        :return     <float>

def percentAt(self, value):
        """
        Returns the percentage the value represents between the minimum and
        maximum for this axis.
        
        :param      value | <int> || <float>
        
        :return     <float>
        """
        min_val = self.minimum()
        max_val = self.maximum()
        
        # round the max value to sync with the values in the grid
        total_seconds = (max_val - min_val).total_seconds()
        value_seconds = (value - min_val).total_seconds()
        
        if value < min_val:
            return 0.0
        elif max_val < value:
            return 1.0
        
        try:
            perc = value_seconds / float(total_seconds)
        except ZeroDivisionError:
            perc = 0.0
        
        return perc