Question

为什么在cocos2dx中拖动精灵这么难！在我的touchesbegan方法中这样做

void HelloWorld::ccTouchesBegan(cocos2d::CCSet* touches, cocos2d::CCEvent* event){
    CCSprite *splash = CCSprite::spriteWithFile("splash3.png");
    CCTouch* pTouch = (CCTouch*)(touches->anyObject());
    CCPoint location = pTouch->locationInView();
    location = CCDirector::sharedDirector()->convertToGL(location);
    splash->setPosition(ccp(location.x,location.y));
    this->addChild(splash,5);
}


void HelloWorld::ccTouchesMoved(cocos2d::CCSet* touches, cocos2d::CCEvent* event){
    CCSprite *splash = CCSprite::spriteWithFile("splash3.png");
    CCTouch* pTouch = (CCTouch*)(touches->anyObject());
    CCPoint location = pTouch->locationInView();
    location = CCDirector::sharedDirector()->convertToGL(location);
    splash->setPosition(ccp(location.x,location.y));
    this->addChild(splash,5);
}

我做错了什么，还有什么要做的？并且有更简单的方法吗???

Answer 1

您只需要添加一次精灵。您可以保留全局引用或使用其标记检索sprite。此外，您可能错误地计算触摸位置。试试这个

void HelloWorld::ccTouchesBegan(cocos2d::CCSet* touches, cocos2d::CCEvent* event){
    CCSprite *splash = CCSprite::spriteWithFile("splash3.png");
    CCPoint location = getPositionFromTouches(touches, event);
    splash->setPosition(ccp(location.x,location.y));
    this->addChild(splash,5, 100);
}


void HelloWorld::ccTouchesMoved(cocos2d::CCSet* touches, cocos2d::CCEvent* event){
    CCSprite *splash = (CCSprite*) getChildByTag(100);
    CCPoint location = getPositionFromTouches(touches, event);
    splash->setPosition(ccp(location.x,location.y));
}

CCPoint HelloWorld::getPositionFromTouches(CCSet* _touches, CCEvent* event) {

    CCArray *allTouches = CCArray::create();

    CCSetIterator it;

    for( it = _touches->begin(); it != _touches->end(); it++)
    {
        allTouches->addObject((CCTouch *)*it);
    }
    //CCArray *allTouches = getAllTouchesFromSet(_touches);

    CCTouch* fingerOne = (CCTouch *)allTouches->objectAtIndex(0);
    CCPoint  pointOne = CCDirector::sharedDirector()->convertToUI(fingerOne->getLocationInView());

    CCPoint location = _armadilloSingleton->convertToNodeSpace(pointOne);
    return location;
}

Answer 2

spriteWithFile中没有{p> cocos2d2.0.4 那么请您根据COCOCS2D

的最新版本更新代码

使精灵出现在触摸的位置并拖动它

2 个答案: