cocos2dx跟随地图移动

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void HelloWorld::setViewpointCenter(CCPoint position)
{
    CCSize winSize = CCDirector::sharedDirector()->;getWinSize();
    float x = MAX(position.x, winSize.width / 2);
    float y = MAX(position.y, winSize.height / 2);
    x = MIN(x, (map->;getMapSize().width*map->;getTileSize().width) - winSize.width / 2);
    y = MIN(y, (map->;getMapSize().height*map->;getTileSize().height) - winSize.height / 2);
    CCPoint acturalPosition = ccp(x, y);
    CCPoint centerView = ccp(winSize.width / 2, winSize.height / 2);
    CCPoint viewPoint = ccpSub(centerView, acturalPosition);
    this->;setPosition(viewPoint);
}

map是地图文件，需要这样获取：

map = dynamic_cast<CCTMXTiledMap*>;(rootNode->;getChildByName("Map"));