from graphics import *

def get_y(x):
    return x*x*x - 2*x +2

def main():
    win = GraphWin("Graphing calulator", 300, 300)
    win.yUp()
    x_prev = -10
    y_prev = get_y(x_prev)
    pt = Point(x_prev, y_prev)
    for i in range(-1000, 1000):
        j = (float)i/(float)100
        pt_new = Point(j, get_y(j))
        line = Line(pt, pt_new)
        line.draw(win)
        pt = pt_new

   
main()