Blob tracking and collision detection

Processing Libraries
9

WORKING!

Over the past 2 days I have been relentlessly googling and trawling old forums trying to get this collision detection working!

I finally found this version, and implemented the piece of code proposed by Quark:

 for (int i = 0; i < blobs.size() - 1; i++) {
      for (int j = i + 1; j <blobs.size(); j++) {    
        if (dist(blobs.get(i).minx, blobs.get(i).miny, blobs.get(j).minx, blobs.get(j).miny) <= 100) {
        fill (255,0,0);
      } else {
        fill (255);
    }
  }
      }

It only works when I put it inside the class Blob, but, when it detects collision, ALL the blobs turn red?? I only want the blobs that have collided to turn red… Any ideas?

I also tried to turn it into a boolean so I could allocate colour/behaviour in the main sketch to future-proof the concept when I eventually want to load different images or behaviours…

boolean checkCollision() {
      for (int i = 0; i < blobs.size() - 1; i++) {
      for (int j = i + 1; j <blobs.size(); j++) {    
        if (dist(blobs.get(i).minx, blobs.get(i).miny, blobs.get(j).minx, blobs.get(j).miny) <= 100) {
        return true;
      } else {
        return false;
    }
  }
      }
    }

but it came up with the error “This method must return a result of type boolean”

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