def sequence(self):
        '''
        sort the points in the line with given option
        '''
        if (len(self.Points[0]) == 2):
            if (self.Sort == 'X' or self.Sort == 'x'):
                self.Points.sort(key=lambda x: x[0])
                self.order(self.Points)
            elif (self.Sort == 'Y' or self.Sort == 'y'):
                self.Points.sort(key=lambda x: x[1])
                self.order(self.Points)
            else:
                self.order(self.Points)
        if (len(self.Points[0]) == 3):
            if (self.Sort == 'X' or self.Sort == 'x'):
                self.Points.sort(key=lambda x: x[0])
                self.order(self.Points)
            elif (self.Sort == 'Y' or self.Sort == 'y'):
                self.Points.sort(key=lambda x: x[1])
                self.order(self.Points)
            elif (self.Sort == 'Z' or self.Sort == 'Z'):
                self.Points.sort(key=lambda x: x[2])
                self.order(self.Points)
            else:
                self.order(self.Points)