Question

I’m making a platformer, with tile based map (like a lot of people). I begin in video games’s developing so it’s a little hard. I wan’t to learn by myself but on this problem I’m stuck .

My maps are made with a list like this :

mapList[x][y] = tile

With this list, I can loop on all the Tiles and draw them.

What I want to do is to “Loop” (repeat) the map. I mean, when the character reach the right limit (or left), the map repeats. I don’t understand how to do this, I search all the forums and all the question, but I found nothing 🙁

For instance

I don’t know if I’m making myself clear but English is not my best language and i’m sorry for this :p.

Thanks in advance for trying to help me or just for reading my issue.

Answer 1

When you have a grid that is WxH cells, the valid ranges for X are 0..W-1

So as a first approach :

 int nextX = (X+1) % W;   // wraps around to 0

but you’ll also need something for prevX (X-1) and maybe for X+d where d can be positive or negative.
You don’t want to mess with the modulo of negative numbers, so

 int MoveX(int d) { return (X+W+d) % W; }