import direction

class Coordinates(object):
    '''
    The class C{Coordinates} represents pairs of 
    integers that specify locations on a two-dimensional grid.
    As is common in programming environments, the x values 
    increase towards the right (east) and the y values 
    increase downwards (south). A coordinate object is immutable
    after creation.
    '''

    def __init__(self, x, y):
        '''
        Creates a new coordinate pair.
        
        Parameter x: int

        Parameter y: int
        '''  
        self.x = x    # fixed value
        self.y = y    # fixed value
  
  
    def get_x(self):  
        '''
        Returns the x coordinate (int)
        '''   
        return self.x
  
  
  
    def get_y(self):  
        '''
        Returns the y coordinate (int)
        '''   
        return self.y
  
  
  
    def get_neighbor(self, direction):  
        '''
        Returns the coordinates that are next to these ones, in the given direction.
        
        Parameter direction: tuple

        Returns the neighboring coordinates (Coordinates)
        '''
        return self.get_relative(direction, 1)
  
  
  
    def get_relative(self, new_direction, distance):  
        '''
        Returns the coordinates that are a given distance from these coordinates, in the given direction.  E.g. if these
        coordinates are (2, 2), and the parameters are direction.EAST and 3, the result is (5, 2).
        
        Parameter direction: tuple

        Parameter distance: (non-negative) int

        Returns a coordinate pair relative to this one (Coordinates)

        '''
        return Coordinates(self.get_x() + direction.get_x_step(new_direction) * distance,
                           self.get_y() + direction.get_y_step(new_direction) * distance)
  
  
  
  
    def __str__(self):  
        '''
        Returns a string of the form (X, Y) representing of the coordinate pair
        
        '''
        return '({:d}, {:d})'.format(self.get_x(), self.get_y())