gen = {}

function gen:new(game,sprite,speedx,speedy,depth)
	
	local Background = game.objects.base:new(game,0,0,game.WIDTH,game.HEIGHT)
	Background.sprite = sprite
	Background.spritewidth = sprite:getWidth()
	Background.spriteheight = sprite:getHeight()
	Background.nbwidth = game.WIDTH%sprite:getWidth()+2
	Background.nbheight = game.HEIGHT%sprite:getHeight()+2
	Background.speedx = speedx or 30
	Background.speedy = speedy or 30
	Background.depth = depth or -2
	Background.offx = 0
	Background.offy = 0

	function Background:step(dt)
		self.offx = (self.offx + dt*self.speedx)%self.spritewidth
		self.offy = (self.offy + dt*self.speedy)%self.spriteheight
	end

	function Background:draw()
		local i=0
		local j=0
		for i=-1,self.nbwidth-1 do
			for j=-1,self.nbheight-1 do
				lg.draw(self.sprite,i*self.spritewidth+self.offx,j*self.spritewidth+self.offy)
			end
		end
		
	end

	return Background

end

return gen