0 0 0 0 0

0 0 0 0 0

0 0 0 0 0

0 0 0 0 0

pt1 = 2,1

pt2 = 4,3

pt3 = 0,3

line(a,b):

  change = b/a

  ct = max(abs(change))

  for t = 0..ct inclusive:

    plot(a + change * t / ct)

line(pt1,pt2)

line(pt2,pt3)

line(pt3,pt1)