Question

Normally to set a boundary at a certain area, I would implement something like:

if(player.X > 400){

   player.X = 400;

}

This acts as though there is a vertical line at X=400, blocking movement beyond that. I’m wondering how I would implement at boundary for an area that is at a slant or diagonal rather than vertical/horizontal.

Answer 1

Hope I answer your question instead of making assumptions about what you are trying to achieve and suggesting a physics engine.

Anyways I would suggest using a line equation and the MathHelper.Clamp function

y = mX + b; // Line equation
x = (y - b) / m

So now you can get the x boundary for the y value of your Player

MathHelper.Clamp(Player.X, min, (Player.Y - b) / m) 

Or the x boundary from the y value of you Player

MathHelper.Clamp(Player.Y, min, (m * Player.X) + b)