如何获得一个Node的BoundingBox？

Cocos2d-x
#1

Node* node1 = Node::create();

Node* node2 = Node::create();
node2->addChild(Sprite::create(“1.png”));

node1->addChild(node2);
node1->getBoundingBox();

这时node1的BoudingBox宽高为0， 如何能获取到包含它所有子元素的BoudingBox？

#2

貌似没人关注这问题。。。
自己写了2个函数，递归获取Node的BoundingBox和ContentSize，用着貌似没什么Bug。。。 onlyTexture参数的意思是只统计贴图占用的空间

Rect getBoundingBoxRecursive(Node *node, bool onlyTexture = true) {
    CCAssert(node != nullptr, "node can't be null");

    Rect nodeRect = node->getBoundingBox();
    nodeRect.origin = node->convertToWorldSpace(Vec2::ZERO);

    for_each(node->getChildren().begin(), node->getChildren().end(), &](Node* subNode) {
        Rect subNodeRect;
        subNodeRect = getBoundingBoxRecursive(subNode);
        if (onlyTexture && nodeRect.size.equals(Size::ZERO)) {
            nodeRect.origin = subNodeRect.origin;
        }
        nodeRect.merge(subNodeRect);
    });
    return nodeRect;
}

Vec2 getContentSizeRecursive(Node *node, bool onlyTexture = true) {
    return getBoundingBoxRecursive(node, onlyTexture).size;
}

```
#3

顺便说一下，获取的BoundingBox是世界坐标系下的，需要自己转到需要的Node坐标系下面

#4 
CCRect CCArmature::boundingBox()
{
    float minx, miny, maxx, maxy = 0;

    bool first = true;

    CCRect boundingBox = CCRectMake(0, 0, 0, 0);

    CCObject *object = NULL;
    CCARRAY_FOREACH(m_pChildren, object)
    {
        if (CCBone *bone = dynamic_cast(object))
        {
            CCRect r = bone->getDisplayManager()->getBoundingBox();
            if (r.size.width == 0 || r.size.height == 0) 
                continue;

            if(first)
            {
                minx = r.getMinX();
                miny = r.getMinY();
                maxx = r.getMaxX();
                maxy = r.getMaxY();

                first = false;
            }
            else
            {
                minx = r.getMinX() < boundingBox.getMinX() ? r.getMinX() : boundingBox.getMinX();
                miny = r.getMinY() < boundingBox.getMinY() ? r.getMinY() : boundingBox.getMinY();
                maxx = r.getMaxX() > boundingBox.getMaxX() ? r.getMaxX() : boundingBox.getMaxX();
                maxy = r.getMaxY() > boundingBox.getMaxY() ? r.getMaxY() : boundingBox.getMaxY();
            }

            boundingBox.setRect(minx, miny, maxx - minx, maxy - miny);
        }
    }

    return CCRectApplyAffineTransform(boundingBox, nodeToParentTransform());
}


```


从CCArmature直接偷来的代码。 
递归什么的，我脑子可能没长那根弦真的好难懂。。
#5

boundingbox 需要被加到场景上之后才能获取！，因为坐标是世界坐标，不放到场景上哪来的世界坐标