How Interact with ContourFinder(Contour detected -OfxOpencv),blobs VS Some kind of objects,like a simple circle or a system particle for instance?

Something like that:

for (int i = 0, int numBlobs = contourFinder.blobs.size(); i < numBlobs; ++i){
    ofxCvBlob & blob = contourFinder.blobs[i];
    ofVec2f c( blob.centroid.x, blob.centroid.y );
    ofVec2f v = p - c;
    float d = v.length();
    float f = 10000 / d / d;
    v = v.getNormalized() * f;
    p += v;
}