How to stop a game object leaving the screen

Questions
#1

Hi,

I was wondering how i could stop my player from leaving the screen? it is controlled using the arrow keys and I don’t want it to move off the screen when my game is inplay.

Thanks

#2

One option is to check the position and if it is outside screen bounds you reset the position. Like this:

function update(self, dt)
	local pos = go.get_position()
	local width, height = window.get_size()
	if pos.x < 0 then
		pos.x = 0
	elseif pos.x > width then
		pos.x = width
	end
	if pos.y < 0 then
		pos.y = 0
	elseif pos.y > height then
		pos.y = height
	end
	go.set_position(pos)
end
#3

Brilliant, thank you!