from geometry import Geometry


class Point(Geometry):
    """ base class for points, used by line """
    
    def __init__(self, x, y):
        self.x = x
        self.y = y
        
    def project(self, proj):
        (x,y) = proj.project(self.x, self.y)
        self.x = x
        self.y = y
    
    """emulate python's container types"""
    def __len__(self):
        return 2
        
    def __getitem__(self, k):
        pt = (self.x, self.y)
        return pt[k]
        
    def __setitem__(self, k, value):
        if k == 0: 
            self.x = value
        elif k == 1:
            self.y = value
        else:
            raise IndexError
        
    def __delitem__(self, key):
        raise TypeError('deletion not supported')