Photoshop || Gimp. Нарисовать синусоиду

$ cat >~/.gimp-2.6/plug-ins/simple_sine
#!/usr/bin/env python

import gimpfu
import math

def python_simple_sine(img, layer):
    w = layer.width
    h = layer.height
    rgn = layer.get_pixel_rgn(0, 0, w, h)
    ly = None
    for x in range(w):
        ny = int(math.sin(x / 50.0) * 100.0 + h / 2.0)
        if ly != None:
            if ly > ny:
                for y in range(ny, ly + 1):
                    rgn[x, y] = '\0\0\0'
            else:
                for y in range(ly, ny + 1):
                    rgn[x, y] = '\0\0\0'
        ly = ny
    layer.update(0, 0, w, h)

gimpfu.register(
        'python_fu_simple_sine',
        'Draw simpe sine.',
        'Draw simpe sine.',
        'Vasya Pupkin',
        'Vasya Pupkin',
        '2010',
        '<Image>/Filters/Render/Simple sine',
        "RGB*",
        [],
        [],
        python_simple_sine
)

gimpfu.main()

<Ctrl + D>

$ chmod a+x ~/.gimp-2.6/plug-ins/simple_sine