Entry to CodeBrawl - ChunkyPNG edition

chunkybrawl.rb

#! /usr/bin/env ruby

require 'rubygems'
require 'chunky_png'

image = ChunkyPNG::Image.from_file('input.png')
h = image.dimension.height
print "height #{h} \n"
w = image.dimension.width
print "width #{w} \n"


def pixel_bomb(x, y, image)
  currentGreen = ChunkyPNG::Color.g(image[x,y])

  color = ChunkyPNG::Color(image[x,y])
  sz = case currentGreen
       when 0..63
       rand(2)
       when 63..127
       1
       when 127..191
       2
       when 191..255
       4
       end

  (-sz..sz).to_a.each do |xn|
    (-sz..sz).to_a.each do |yn|
      p = x + xn
      q = y + yn
      image.set_pixel_if_within_bounds(p,q, color)
    end
  end
end

def back_to_xy(int, width, height)
  x = int % width
  y = (int / width)
  [x, y]
end

hash = Hash.new{|h, k| h[k] = []}

(0..h-1).each do |y|
  (0..w-1).each do |x|
    this_one = (y * w) + x
    currentGreen = ChunkyPNG::Color.g(image[x,y])
    hash[currentGreen] << this_one
  end
end

shash = hash.sort

shash.each do |k, v|
  v.each do |pixel|
    x, y = back_to_xy(pixel, w, h)
    pixel_bomb(x, y, image)
  end
end

image.save('output_' + Time.now.to_i.to_s + '.png')