#!/usr/bin/ruby

files = ['zombiesmap.png', '../html/demtoc/img/plans/calques/plan_persos_1.png']

require 'libpng'

def init_zombies(file, zombies)
	i = Png.new(File.read(file))
	600.times { |y|
		l = i.lines[y]
		800.times { |x|
			zombies[[x, y]] = i.palette[l[x]] if l[x] > 0
		}
	}
	puts "#{file}: #{zombies.keys.length} cases"
	i
end

def update_zombies(file, zombies)
	i = Png.new(File.read(file))
	c = zombies.keys.dup
	c.each { |x, y|
		zombies.delete([x, y]) if zombies[[x, y]] != i.palette[i.lines[y][x]]
	}
	puts "#{file}: #{zombies.keys.length} zombies"
	i
end

zombies = Hash.new

png = init_zombies(files.shift, zombies)
cases = zombies.dup

while not files.empty?
	png2 = update_zombies(files.shift, zombies)
end

k, v = nil
cases.each { |k, v|
	png.lines[k[1]][k[0]] = 0 unless zombies[k]
}
png.write 'zombiesmap.png', true

zombies.each { |k, v|
	png2.lines[k[1]][k[0]] = 0
}
png2.write 'zombiesnzmap.png', true

File.open('zombieslist', 'w') { |fd|
	zombies.each_key { |k|
		fd.puts "#{k[0]}, #{600-k[1]}"
	}
}