load (draw)$

xoffset : 1.2$
yoffset : -0.2$

koord : [
    head_length = 0.2,           /* Pfeil-Kopflaenge */
    color = black,
    xtics = [-3, 1, 3],
    vector ([-4, -4], [8, 8]),    /* y-Achse */
    vector ([-4, 0], [8, 0]),   /* x-Achse */
    xaxis = false, xtics = false,
    yaxis = false, ytics = false,
    label (
        ["-3", -3+0.3, -3],
        ["-2", -2+0.3, -2],
        ["-1", -1+0.3, -1],
        [ "1",  1-0.3,  1],
        [ "2",  2-0.3,  2],
        [ "3",  3-0.3,  3]
        ),
    label (
        ["-3", -3, -0.5],
        ["-2", -2, -0.5],
        ["-1", -1, -0.5],
        [ "0",  0, -0.5],
        [ "1",  1, -0.5],
        [ "2",  2, -0.5],
        [ "3",  3, -0.5]
        )
    ]$


draw (
   gr2d (
     user_preamble = ["set noborder"],
     koord,
     point_type = 'none,
     points_joined=true,
     points ([[-3,0], [-6,-3], [-3,-3]]),
     points ([[-2,0], [-4,-2], [-2,-2]]),
     points ([[-1,0], [-2,-1], [-1,-1]]),
     points ([[1,0], [2,1], [1,1]]),
     points ([[2,0], [4,2], [2,2]]),
     points ([[3,0], [6,3], [3,3]]),
     point_size = 2,
     point_type = 7,
     label (["(1|1)", 2.3, 1.3]),
     points ([[2,1]]),
     label (["(2|2)", 4.3, 2.3]),
     points ([[4,2]]),
     xrange = [-6, 6],
     yrange = [-6, 6]
   ),

   file_name = "koordschief",
   dimensions = [600,600],
   terminal = gif
);