Widening a PNG sprite on three places

gistfile1.txt

require 'chunky_png'

original = ChunkyPNG::Image.from_file "original.png"

target = ChunkyPNG::Image.new(original.width + (355 * 3), original.height)

break_columns = [100, 310 + 100, 620 + 100]

target_x = 0
(0...original.width).each do |x|
  col = original.column(x)
  if break_columns.include? x
    356.times do
      target.replace_column!(target_x, col)
      target_x += 1
    end
  else
    target.replace_column!(target_x, col)
    target_x += 1
  end
end

target.save "/tmp/success.png"