cocos2d-x 3.2 移动游戏背景和精灵,cocos2d-x游戏背景
1,先新增监听事件
auto listener = EventListenerTouchOneByOne::create();
listener->setSwallowTouches(true);
listener->onTouchBegan = CC_CALLBACK_2(StartGame::onTouchBegan, this);
listener->onTouchMoved = CC_CALLBACK_2(StartGame::onTouchMoved, this);
listener->onTouchEnded = CC_CALLBACK_2(StartGame::onTouchEnded, this);
_eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
2,监听的方法回调函数实现
bool StartGame::onTouchBegan(Touch* touch, Event* event)
{
Point touchLocation = this->convertTouchToNodeSpace(touch);
this->selectSpriteForTouch(touchLocation);
return true;
}
void StartGame::onTouchMoved(Touch* touch, Event* event)
{
Point touchLocation = this->convertTouchToNodeSpace(touch);
Point oldTouchLocation = touch->getPreviousLocation();
oldTouchLocation = this->convertToNodeSpace(oldTouchLocation);
Point translation = touchLocation - oldTouchLocation;//获取移动的距离
CCLog("touchLocation--------------------%d-------%d",touchLocation.x,touchLocation.y);
CCLog("oldTouchLocation--------------------%d-------%d",oldTouchLocation.x,oldTouchLocation.y);
CCLog("translation--------------------%d-------%d",translation.x,translation.y);
this->boundLayerPos(translation);//背景移动函数
//this->panForTranslation(translation);//精灵移动函数
}
void StartGame::onTouchEnded(Touch* touch, Event* event)
{
}
3,方法实现
这个事背景事件,在init里面加载一张背景图片
void StartGame::boundLayerPos(Point newtouch)
{
Size winSize = Director::getInstance()->getWinSize();
Point newPos = this->getPosition() + newtouch;
auto map = getChildByTag(102); //这里获取背景图片
newPos.x = MIN(newPos.x, 0);
newPos.x = MAX(newPos.x, -map->getContentSize().width+winSize.width);
newPos.y = MIN(newPos.y,0);
newPos.y = MAX(newPos.y, -map->getContentSize().height + winSize.height);
this->setPosition(newPos);
}
精灵移动方法实现
在init里面加载一个精灵
void StartGame::panForTranslation(Point translation)
{
auto sprite = getChildByTag(101);//获取精灵
Point newPos = sprite->getPosition() + translation;
sprite->setPosition(newPos);
}
这就ok了
精灵或者是背景图片移动都是在触屏监听事件的onTouchMoved(Touch* touch,Event * event)里面获取原触屏点和移动以后的触屏点,得到他们的差值,给精灵或者背景图片重新定位setPosition(Point * point),就完成了背景和精灵的移动(背景图片要判断边界值得)
注意,Node可通过函数getBoundingBox返回精灵的边界矩形。这比你自己手动计算精灵的边界矩形要好多了。因为,第一,它更简单;第二,它考虑了精灵的位置坐标变换。(比如锚点变了,要执行相应的矩阵变换,具体可以参考源代码,这些就不再细说了。)
点击选中的时候可以先让精灵做一些动作,这里是闪烁
void StartGame::selectSpriteForTouch(Point touchLocation)
{
auto sprite = getChildByTag(101);
if ( sprite->getBoundingBox().containsPoint(touchLocation) )
{
auto blink = CCBlink::create(2.0f,5);
sprite->runAction(blink);
}
}
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