Mandelbrot Set done with colors (and BEN!)

mandy.rb

require 'complex'

XR = 0.01575 * 2
YR = 0.0125 * 2
ESCAPE_RADIUS = ARGV[0].to_f || 2.0

def mandelbrot(a)
  x = a.real
  y = a.imaginary
  i = 0
  Array.new(512,a).inject(a) do |z,c|
    i += 1
    result = z*z + c
    break result if result.abs > ESCAPE_RADIUS
    result
  end

  return Math.log2(i)
end

COLORS = [
  "\033[31m",
  "\033[32m",
  "\033[33m",
  "\033[34m",
  "\033[35m",
  "\033[36m",
  "\033[37m",
  "\033[1;30m",
  "\033[1;31m",
  "\033[1;32m"
]

def print_mandy c
  print COLORS[c.to_i] + c.to_i.to_s + "\033[0m"
end

(1.0).step(-1.0,-0.5*YR) do |y|
  (-2.0).step(0.5,0.5*XR) do |x|
    print_mandy mandelbrot(Complex(x,y))
  end
  puts
end

Mandelbrot set

pass your escape radius as the first argument, or it will be 2.0

Done with @benjamintanweihao