cocos2d-x项目101次相遇:action ,移动sprite

• cocos2d-x 101次相遇 / 目录 
  1   安装和环境搭建 －xcode 
  2   Scenes ， Director， Layers， Sprites
  3   建立图片菜单 
  4   在HelloWorld上－－建立新场景 
  5   增加一个精灵sprite 
  5.1   缩小sprite并使之完整显示
  6   action ,移动sprite 
  7   3.0 的点击事件，CCTouchDelegate已经停用了
  8   使用触摸事件移动 精灵

cocos2d-x 3.0 不再使用 TouchDelegate方式来将touch事件捆绑到sprite上。

新的方法是

    auto listener = EventListenerTouchOneByOne::create();
    listener->setSwallowTouches(true);
    listener->onTouchBegan = CC_CALLBACK_2(CMyFirstScene::onTouchBegan, this);
    listener->onTouchMoved = CC_CALLBACK_2(CMyFirstScene::onTouchMoved, this);
    listener->onTouchEnded = CC_CALLBACK_2(CMyFirstScene::onTouchEnded, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);

这段代码可以放在.cpp里面的 init里。

头文件增加：

    Sprite *s;
    // 初始化
 
    bool onTouchBegan(Touch* touch, Event* event);
    void onTouchMoved(Touch* touch, Event* event);
    void onTouchEnded(Touch* touch, Event* event);
    void selectSpriteForTouch(Point touchLocation);

s 为全局的精灵。

bool CMyFirstScene::onTouchBegan(Touch* touch, Event* event)
{
    CCLOG("TouchBegan");
    Point touchLocation = this->convertTouchToNodeSpace(touch);
    this->selectSpriteForTouch(touchLocation);
    return true;
}
void CMyFirstScene::onTouchMoved(Touch* touch, Event* event)
{
    CCLOG("TouchMoved");
}
void CMyFirstScene::onTouchEnded(Touch* touch, Event* event)
{
    CCLOG("TouchEnded");
}
void CMyFirstScene::selectSpriteForTouch(Point touchLocation)
{
        if (s->getBoundingBox().containsPoint(touchLocation) )
        {
            Action* actionMove =
            MoveTo::create( 2.0,
                           ccp(300, 200) );
            s->runAction(actionMove);
        }
}

这段代码，点击到精灵，精灵就会移动。

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