Recieve XP Based on Damage

I got an enemy with a set mount of XP that it will yield upon death. But since in the game I'm working on the player will have NPCs targeting the same enemies, I want to divide the XP between everyone involved in the battle based on how much damage they dealt. So if the player damages the enemy for 40% of its HP and a few NPCs damages the enemy for the other 60%, he player only receives 40% of the XP.

However, I have no idea how to even start with this. Percentage is pretty much nonexistent in Unity as far as I know, at least in this form, and also comparing two different values... Yeah, I was just wondering if anyone knows a good solution for this or if I'm demanding too much.

 

add a dictionary to the thing being killed, have it log the "attacker" (key) and the "damage dealt" (value) to the dictionary so you can keep a track of who did what.

When the thing is killed you should know the total (i.e. the starting health) and can do a quick iterate to calc the ratio (value / total), percentage just being a "100 base" ratio, and send an event/message/whatever to each attacker with the appropriate xp value.

 

Thanks! I was a little confused by parts of your explanation, but it put my on the right track. I made sure every attacker up to 5 different ones at once are stored within the enemy, and upon death it uses the equation "(attacker #'s damage * XP) / max health". Now it works wonders!