# The Fern Fractal
# by Luis Correia
#
# port by omygawshkenas
 
require 'ruby-processing'
 
class Fern < Processing::App
  
  def setup
    no_loop
    puts "Be patient. This takes about 10 seconds to render."
  end
 
  def draw
    background 0
    load_pixels
    x0, y0 = 0.0, 0.0
    x, y, r = 0.0, 0.0, 0.0
    i, j = 0, 0
    max_iterations = 200000
    
    max_iterations.times do
      r = rand * 100
      if r <= 1
        x = 0.0
        y = 0.16 * y0
      elsif r <= 7
        x = 0.2 * x0 - 0.26 * y0
        y = 0.23 * x0 + 0.22 * y0
      elsif r <= 14
        x = -0.15 * x0 + 0.28 * y0
        y = 0.26 * x0 + 0.24 * y0
      else 
        x = 0.85 * x0 + 0.04 * y0
        y = -0.004 * x0 + 0.85 * y0 + 1.6
      end
      
      i = height - (y * 45).to_i
      j = width / 2 + (x * 45).to_i
      pixels[i * height + j] += 2560 if (i >=0 && i < height && j >= 0 && j < width)
      x0, y0 = x, y
    end
    
    update_pixels
  end
end
 
Fern.new :title => "Fern", :width => 500, :height => 500