```ruby
class Map

	def initialize(window, mapfile)
		@window = window
	end

end
```

Load diagonal lines as an instance variable
user
```ruby
class Map

	def initialize(window, mapfile)
		@window = window
		@tileset = Gosu::Image.load_tiles(window, 'media/32x32diagonal_lines.png',
		                                  32, 32, false)
	end

end
```
assistant