Question

I am programming a side-scrolling game.
I want to be able to control the speed of the endless side-scrolling background relative to the speed and position the player is moving at.

I want to know how to do a few things:

• Like, if the player is running, the background scrolls faster. If the
• Player is walking, the background scrolls slower. If the player isn’t
• Moving, the background shouldn’t be moving. If the it is at the start
• Or end of the level, the background should stop moving too.

Anyone can give me insight on how to do this?

Answer 1

There’s a simple formula that can do this for you:

Adjust the position of the background elements to be a percentage of the foreground elements. The lower the percentage, the slower they will move with the rest of the game.

Sample:

background.x = player.x * 0.2;
background.y = player.y * 0.2;

The background will always move at 20% of the speed of the player. When the player moves 200 pixels, the background will only scroll 40 pixels.