Checking if a player is behind another player

I was thinking about cool little pvp like additions and a thought of one where if you hit a player from behind it does a little bit extra damage. The only problem is that I have no idea how to check if a player is behind another player. So if anyone knows could you please explain it to me thanks.

 

This might work... didn't test it out.

Code:

Vector v = player.getEyeLocation().getDirection();
v.setX(v.getX() * -1);
v.setZ(v.getZ() * -1); // reverses direction
Location l = player.getEyeLocation();
 
for (int i = 0; i < 10; i++) { // iterate location
    l = l.add(v);
   
    for (Entity e : player.getNearbyEntities(10, 10, 10)) {
          if (e == attacker) {
              // do stuff
          }
    }
}

 

Afridge1O1 Get the blockx and blockz position of both players and if they are different by 1 or 2 blocks, do something

 

attacker.getLocation().getDirection().angle(victim.getLocation().getDirection()) / 180 * Math.PI;

This gives you the angle in degree of an entity to another. You just need to add some range checks and a damage mod and you've finished a basic backstab.