spirala.py

def emit_point():
    print "x", x, "y", y

while width > 0 and height > 0:
    direction = 1
    while direction >= -1:
        for i in range(width - 1):
            emit_point()
            x += direction
        for i in range(height - 1):
            emit_point()
            y += direction
        direction -= 2
    x += 1
    y += 1
    width -= 2
    height -= 2