public void lookAtPoint(final Location point) {
if (this.getEntity().getBukkitEntity().getWorld() != point.getWorld()) return;
final Location npcLoc = ((LivingEntity) this.getEntity().getBukkitEntity()).getEyeLocation();
final double xDiff = point.getX() - npcLoc.getX();
final double yDiff = point.getY() - npcLoc.getY();
final double zDiff = point.getZ() - npcLoc.getZ();
final double DistanceXZ = Math.sqrt(xDiff * xDiff + zDiff * zDiff);
final double DistanceY = Math.sqrt(DistanceXZ * DistanceXZ + yDiff * yDiff);
double newYaw = Math.acos(xDiff / DistanceXZ) * 180 / Math.PI;
final double newPitch = Math.acos(yDiff / DistanceY) * 180 / Math.PI - 90;
if (zDiff < 0.0) newYaw = newYaw + Math.abs(180 - newYaw) * 2;
this.setYaw((float) (newYaw - 90));
this.setPitch((float) newPitch);
}
public double getDistance2(Player player1, Player player2) {
Location loc1 = player1.getLocation();
Location loc2 = player1.getLocation();
return Math.sqrt(
Math.pow(loc1.getX() - loc2.getX(), 2.0D)
+ Math.pow(loc1.getY() - loc2.getY(), 2.0D)
+ Math.pow(loc1.getZ() - loc2.getZ(), 2.0D));
}