gistfile1.txt

def map2png
    png = ChunkyPNG::Image.new(15, 15, ChunkyPNG::Color::TRANSPARENT)

    $map.each_with_index do |v, y|
        v.each_with_index do |_, x|
            character = $map[x][y]
            case character
                when -1 then png[x, y] = ChunkyPNG::Color('black')
                when 0 then png[x, y] = ChunkyPNG::Color('white')
                when 1 then png[x, y] = ChunkyPNG::Color('red')
                when 2 then png[x, y] = ChunkyPNG::Color('green')
            end
        end
    end
    png.resample_nearest_neighbor!(150, 150)
    png.save 'map.png'
end