Method initWithTargetAndOffset

core/2d/Action.cpp:213–263

}

bool Follow::initWithTargetAndOffset(Node* followedNode, float xOffset, float yOffset, const Rect& rect)
{
    AXASSERT(followedNode != nullptr, "FollowedNode can't be NULL");
    if (followedNode == nullptr)
    {
        AXLOGE("Follow::initWithTarget error: followedNode is nullptr!");
        return false;
    }

    followedNode->retain();
    _followedNode         = followedNode;
    _worldRect            = rect;
    _boundarySet          = !rect.equals(Rect::ZERO);
    _boundaryFullyCovered = false;

    Vec2 winSize = Director::getInstance()->getWinSize();
    _fullScreenSize.set(winSize.width, winSize.height);
    _halfScreenSize = _fullScreenSize * 0.5f;
    _offsetX        = xOffset;
    _offsetY        = yOffset;
    _halfScreenSize.x += _offsetX;
    _halfScreenSize.y += _offsetY;

    if (_boundarySet)
    {
        _leftBoundary   = -((rect.origin.x + rect.size.width) - _fullScreenSize.x);
        _rightBoundary  = -rect.origin.x;
        _topBoundary    = -rect.origin.y;
        _bottomBoundary = -((rect.origin.y + rect.size.height) - _fullScreenSize.y);

        if (_rightBoundary < _leftBoundary)
        {
            // screen width is larger than world's boundary width
            // set both in the middle of the world
            _rightBoundary = _leftBoundary = (_leftBoundary + _rightBoundary) / 2;
        }
        if (_topBoundary < _bottomBoundary)
        {
            // screen width is larger than world's boundary width
            // set both in the middle of the world
            _topBoundary = _bottomBoundary = (_topBoundary + _bottomBoundary) / 2;
        }

        if ((_topBoundary == _bottomBoundary) && (_leftBoundary == _rightBoundary))
        {
            _boundaryFullyCovered = true;
        }
    }

    return true;
}

bool Follow::initWithTarget(Node* followedNode, const Rect& rect /*= Rect::ZERO*/)
{