Player height and User aiming location detection(Pro-Bot)(Java)

I'm writing a script for etewt3's 'Pro-Bot'.
The my question is, is there a way within 'Pro-Bot' or Java to detect the players hitbox and where the user is aiming at (ie the foot, chest, head).
I didn't know if there was a built in function but I didn't see one when I looked over the source.

Here is the data in which I want to get

Code:

public enum aimingAt {
	FEET,
	KNEES,
	NUTS,
	STOMACH,
	CHEST,
	HEAD;
}

(You don't need to spoon feed me answers, I can likely code it my self)

Thanks in advance.

Player height and User aiming location detection(Pro-Bot)(Java)