I'm working on a game as part of a school assignment, the basics is that it's a fighting game in real life. What I need to do is track two colors (or possibly more but two will do for now) and I need to have an image appear on screen when two colors collide or clash (when their x and y coordinates are the same basically). I have been away from programming for a couple of years and could use some help with this. 

I'm using the following code from the "Learning Processing" book to track colors, which works fine but I have no clue how to add this last part that I described above.

CODE: http://www.learningprocessing.com/examples/chapter-16/example-16-11/

Any help is appriciated!