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For what I'm working on, I need to figure out what direction the player is facing and, from that, be able to derive points on the X-Z plane that go linearly in that direction from the player's X-Z coordinates.

How could I go about doing that?

I'm not entirely sure what you are trying to accomplish here. Please give me some more information?

Okay, I'll try to rephrase it.

There are essentially 8 compass directions the player can face and move in: +X (x coord up), -X (x coord down), +Z, -Z, +X-Z, +X+Z, -X-Z, and -X+Z.

I want to figure out which of these directions the player is facing so that I can derive {X,Z} coordinates that follow linearly in that direction.

For instance, if the player is at {0,0} and facing in the +X+Z direction, I want to find that out in-code and be able to derive the points ({1,1}, {2,2}, {3,3} etc)

If you look at the debug screen in minecraft by pressing F3, there is an int labeled with "f" and it has a value between 0 and 3 depending on what way the player is facing. Use that.

Quote from Decman1717

If you look at the debug screen in minecraft by pressing F3, there is an int labeled with "f" and it has a value between 0 and 3 depending on what way the player is facing. Use that.

That only gets as specific as the main cardinal directions (N, S, E, W). And I need to figure this out in-code.