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# random dot steraogram
# usage: rcs.rb rcs.dat
sw = 40.0 # width of original pattern
dw = 78.0 # width of generating Random Character Streogram
hdw = dw / 2.0
w = 20.0 # distance between eyes
h =1.0 # distance from screen and base plane
d = 0.2 # z value unit
ss="abcdefghijklmnopqrstuvwxyz0123456789#!$%^&*()-=\\[];'`,./"
rnd = srand() # You don't actually need this in ruby - srand() is called
# on the first call of rand().
while gets()
# print($_)
xr = -hdw; y = h * 1.0; maxxl = -999
s = ""
while xr < hdw
x = xr * (1 + y) - y * w / 2
i = (x / (1 + h) + sw / 2)
if (1 < i && i < $_.length)
c = $_[i, 1].to_i
else
c = 0
end
y = h - d * c
xl = xr - w * y / (1 + y)
if xl < -hdw || xl >= hdw || xl <= maxxl
tt = rand(ss.length)
c = ss[tt, 1]
else
c = s[xl + hdw, 1]
maxxl = xl
end
s += c
xr += 1
end
print(s, "\n")
end
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