Bres line for roblox

--bresenham line walk
function MathUtils:BresLine(x0, y0, x1, y1, callback)

	local sx,sy,dx,dy

	if x0 < x1 then
		sx = 1
		dx = x1 - x0
	else
		sx = -1
		dx = x0 - x1
	end

	if y0 < y1 then
		sy = 1
		dy = y1 - y0
	else
		sy = -1
		dy = y0 - y1
	end

	local err, e2 = dx-dy, nil

	if not callback(x0, y0) then return false end

	while not(x0 == x1 and y0 == y1) do
		e2 = err + err
		if e2 > -dy then
			err = err - dy
			x0  = x0 + sx
		end
		if e2 < dx then
			err = err + dx
			y0  = y0 + sy
		end
		if not callback(x0, y0) then return false end
	end

	return true
end