Practical Collision Detection in cocos2d-x v3.0beta0

gistfile1.cpp

/**
 * The problem is the damage effect that changes boundingBox while detecting collision. 
 * To detect collision correctly, We need to make lists of collided sprites.
 * 
 * Character Class inherited Node and implemted onCollision method.
 * 
 * class Character: public Node {
 * public:
 *   onCollision(Vector<Character *> *characters);
 * }
 * 
 * Wrapping Vector in cocos Object to keep that in Map
 * 
 * class VectorObj: public Object {
 *  VectorObj() {
 *      vect = new Vector<T>();
 *  };
 *  Vector<T> *vect;
 * }
 * 
 */

// collided character lists for each characters
auto map = new Map<Character *, VectorObj<Character *> *>();

for (auto charaA: *characters) {
    Rect rectA = charaA->getBoundingBox();
    
    for (auto charaB: *characters) {
        
        if (charaB != charaA) {
            Rect rectB = charaB->getBoundingBox();
            
            if (rectA.intersectsRect(rectB)) {
                auto list = map->at(charaA);
                // create new vector if the collision list doesn't exist yet
                if (list == NULL) {
                    list = new VectorObj<Character *>();
                    map->insert(charaA, list);
                }
                list->vect->pushBack(charaB);
            }
        }
    }
}

for (auto chara: map->keys()) {
    chara->onCollision(map->at(chara)->vect);
}