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def mandelbrot(c_r, c_i)

limit=95

iterations=0

cr = (c_r * 100).to_i

ci = (c_i * 100).to_i

zr = zi = 0

# Avoid sqrt by squaring the threshold: sqrt(x) < 1000 => x < 1000000

while iterations<limit

zr2 = zr*zr

zi2 = zi*zi

break if zr2+zi2 >= 1000000

zr, zi = (zr2-zi2)/100+cr, (zr*zi*2)/100+ci

iterations+=1

end

return iterations

end

def mandel_calc(min_r, min_i, max_r, max_i, res)

cur_i = min_i

while cur_i > max_i

putc "|"

cur_r = min_r

while cur_r < max_r

ch = 127 - mandelbrot(cur_r, cur_i)

putc ch # Use putc with integer - no string allocation!

cur_r += res

end

putc "|"

putc "\n"

cur_i -= res

end

end

mandel_calc(-2, 1, 1, -1, 0.04)