Scoring

You are tracking the time that it is touching a bloodstream object and not counting the instances of making contact with a bloodstream object. To count the initial contacts, you will need to introduce an instance field to track the state of contact. This can be a boolean field, an int field, or an object reference field. It could even be an array of object references (which would be a lot harder to implement). A boolean will only indicate that one was touched and not track how many may be in contact. An int can track how many are in contact at a time, which may catch most of the contact (if one move off while another moves on, that change will not be tracked). A single object reference would do a little better than a boolean in that secondary contacts will be found as soon as the one referenced moves off. Using an array of object references can be used to catch all contacts; but, it would be much more difficult to code and CPU intensive, to boot.

I am still lost. So currently, the virus collides with the blood cell and it subtracts 1 point for every pixel that it is colliding with. Now, if I made the blood cell remove the Virus it would subtract 1 but I want it to go through the blood cell. Can you post a example of what you mean?

That is not quite what is happening. It is subtracting one for every act cycle that the two are touching. A boolean field might be used as follows: However, if a second white cell touching before the first one un-touches, it will not be caught. The code given will only determine when a change in touching ANY white cell occurs ("touching any" as opposed to "not touching any").

Using an int field, it might be something like this: Again, this is not exact as if one touches when one leaves, it will not be detected. It will, however, detect more than using a boolean field if you have your white cells populated to the point where they often get close to each other.