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Mandelbrot Fractal in ASCII
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| #!/usr/bin/env ruby | |
| height = %x{ tput lines }.to_i - 3 # -3 for PS1 | |
| width = %x{ tput cols }.to_i | |
| scale = 0.6 * width.to_f / height.to_f | |
| definition = 40 | |
| def calculate a, b, c_arr | |
| ca, cb = c_arr | |
| left = a * a - b * b | |
| right = 2 * a * b | |
| a = left + ca | |
| b = right + cb | |
| [a, b] | |
| end | |
| fractal = String.new | |
| shade = [" ", ".", ":", "-", "~", "^", "•", "=", "&", "£", "$", "#", "@"] | |
| height.times do |y| | |
| width.times do |x| | |
| a = ca = (x * 2 * scale / width - scale) - 0.5 | |
| height_scale = 2 * scale * height.to_f / width.to_f # x2 for centering | |
| b = cb = y * 2 * height_scale / height - height_scale | |
| snap = 0 | |
| until snap >= definition | |
| a, b = calculate(a, b, [ca, cb]) | |
| break if a * a + b * b > 16 | |
| snap += 1 | |
| end | |
| unless snap == definition | |
| fractal << shade[snap * (shade.size - 1) / definition] | |
| else | |
| fractal << shade[-1] # Max iteration is set to black (the inner body part) | |
| end | |
| end | |
| fractal += "\n" | |
| end | |
| print fractal |
Author
Demonstrandum
commented
Aug 7, 2017
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