cocos3.X拖动精灵移动

àì夳堔傛蜴生んèń 2022-08-05 08:00 232阅读 0赞

**1、 创建一个精灵sprite；**

**2、一个触摸事件 listener ，设置listener的onTouchBegan,onTouchMoved,onTouchEnded;**

**3、将sprite 和 listener关联起来。**

Sprite* sprite1 = Sprite::create("pk.png");
    	this->addChild(sprite1, 0);
    	sprite1->setPosition(ccp(300, 400));
    	sprite1->setTag(1);
    
    	Sprite*  sprite2 = Sprite::create("pk.png");
    	this->addChild(sprite2, 0);
    	sprite2->setPosition(ccp(200, 400));
    	sprite2->setTag(0);
    
    	Sprite*  sprite3 = Sprite::create("pk.png");
    	this->addChild(sprite3, 0);
    	sprite3->setPosition(ccp(400, 400));
    	sprite3->setTag(0);
    
    
    	auto listener1 = EventListenerTouchOneByOne::create();//创建一个触摸监听
     	listener1->setSwallowTouches(true); //设置是否想下传递触摸
    
    	//通过 lambda 表达式 直接实现触摸事件的回掉方法
    	listener1->onTouchBegan = [](Touch* touch, Event* event){
    		auto target = static_cast<Sprite*>(event->getCurrentTarget());
    
    		Point locationInNode = target->convertToNodeSpace(touch->getLocation());
    		Size s = target->getContentSize();
    		Rect rect = Rect(0, 0, s.width, s.height);
    
    		if (rect.containsPoint(locationInNode))
    		{
    			log("sprite began... x = %f, y = %f", locationInNode.x, locationInNode.y);
    			target->setOpacity(180);
    			return true;
    		}
    		return false;
    	};
    
    	listener1->onTouchMoved = [](Touch* touch, Event* event){
    		auto target = static_cast<Sprite*>(event->getCurrentTarget());
    		target->setPosition(target->getPosition() + touch->getDelta());
    	};
    
    	listener1->onTouchEnded = [=](Touch* touch, Event* event){
    		auto target = static_cast<Sprite*>(event->getCurrentTarget());
    		log("sprite onTouchesEnded.. ");
    		target->setOpacity(255);
    	};
    
    	_eventDispatcher->addEventListenerWithSceneGraphPriority(listener1, sprite1);
    	_eventDispatcher->addEventListenerWithSceneGraphPriority(listener1->clone(), sprite2);
    	_eventDispatcher->addEventListenerWithSceneGraphPriority(listener1->clone(), sprite3);

如果想实现多个精灵拖动，使用clone方法