Method addChild

src/common/overlay/levelRenderer/Group.js:130–153

(child)

     */
    // TODO Type Check
    addChild(child) {
        if (child == this) {
            return;
        }

        if (child.parent == this) {
            return;
        }
        if (child.parent) {
            child.parent.removeChild(child);
        }

        this._children.push(child);
        child.parent = this;

        if (this._storage && this._storage !== child._storage) {

            this._storage.addToMap(child);

            if (child instanceof Group) {
                child.addChildrenToStorage(this._storage);
            }
        }
    }


    /**