from Shape import Shape

class Line(Shape):
    def __init__(self, x0, y0, x1, y1):
        self.vars = [x0, y0, x1, y1]

    def nVars(self):
        return len(self.vars)

    def nPts(self):
        return 3

    def toEqu(self, ptNum):
        if ptNum == 0:
            return ([1, 0, 0, 0], [0, 1, 0, 0])
        elif ptNum == 1:
            return ([0, 0, 1, 0], [0, 0, 0, 1])