rectgen = {}

function rectgen:new(x,y,w,h)

	Rect = {x,y,w,h}

	function Rect:move(x,y)
		self[1] = self[1] + x
		self[2] = self[2] + y
		self:reAdapt()
	end

	function Rect:move_ip(x,y)
		self[1] = x
		self[2] = y
		self:reAdapt()
	end

	function Rect:setSize(w,h)
		self[3] = w
		self[4] = h
		self:reAdapt()
	end

	function Rect:move_center(x,y)
		self[1] = x-self.w/2
		self[2] = y-self.h/2
		self:reAdapt()
	end

	function Rect:reAdapt()
		self.x = self[1]
		self.y = self[2]
		self.w = self[3]
		self.h = self[4]
		self.center = {self.x+self.w/2,self.y+self.h/2}
		self.center.x = self.x+self.w/2
		self.center.y = self.y+self.h/2
		self.up = self.y
		self.left = self.x
		self.right = self.x+self.w
		self.down = self.y+self.h
	end

	function Rect:colliderect(orect,xoffset,yoffset,semisolid) -- AABB collision check
		local result = true
		local offx = xoffset or 0
		local offy = yoffset or 0
		if self.right+offx <= orect.left or self.left+offx>=orect.right then result = false end
		if self.down+offy <= orect.up or self.up+offy>=orect.down then result = false end
		if semi and result then
			if not self.bottom<orect.top then result = false end
		end
		return result
	end

	function Rect:collidepoint(x,y)
		return self.x<x and x<self.x+self.w and self.y<y and y<self.y+self.h
	end

	function Rect:colliderects(recttable,xoffset,yoffset,semisolid)
		local result = {}
		for i,v in pairs(recttable) do
			if self:colliderect(v,xoffset,yoffset,semisolid) then table.insert(result,v) end
		end
		return result
	end

	Rect:reAdapt()

	return Rect

end

return rectgen