cocos动作使用示例（1）

动作应用1

做一个类似水果忍者的效果，每对精灵触摸一次就减血，没血后旋转消失，即需要做个进度条触摸事件+一个单精灵连续动作（callFunc+Sequence，或者RemoveSelf+Sequence）

 

/* 基本属性设置，血量，血条 */

int _hp;

ProgressTimer* _timer;

const int _maxHP = 88;

bool init()

{       Layer::init();

auto winSize = Director::getInstance()->getWinSize();

        /* 创建一个精灵及其基本属性 */

        Sprite* sprite =Sprite::create("Images/elephant1_Diffuse.png");

        addChild(sprite);

        sprite->setPosition(winSize.width /2, winSize.height); //把精灵放在屏幕外

        sprite->setTag(100);

        _hp = _maxHP;

 

        /* 增加血条 */

        /* 一个背景，一个前景，前景被ProgressTimer封装 */

        Sprite* bg = Sprite::create("ccs-res/cocosui/loadingbar.png");

        bg->setTag(101);

        Sprite* fore =Sprite::create("ccs-res/cocosui/slidbar.png");

        ProgressTimer* timer =ProgressTimer::create(fore);

        timer->setType(ProgressTimer::Type::BAR);

        timer->setMidpoint(Vec2(0, 0));

        timer->setBarChangeRate(Vec2(1, 0));

        timer->setPercentage(100);

        _timer = timer; //保存进度条以便操作

        /* 设定血条的父子关系 */

        bg->addChild(timer); //进度条绑在背景中

        sprite->addChild(bg); //背景绑在精灵中

 

        /* 设置位置 */

        Rect rcSprite =sprite->getBoundingBox();

        Rect rcBg =bg->getBoundingBox();

 

        timer->setPosition(bg->getAnchorPointInPoints());//进度条在背景中央

        bg->setPosition(sprite->getAnchorPointInPoints()- Vec2(0,rcSprite.size.height / 2 + rcBg.size.height / 2)); //背景在精灵下

 

        /* 让精灵掉下来 */

        MoveBy* move =MoveBy::create(10, Vec2(0,-winSize.height));

        sprite->runAction(move);

 

        /* 触摸事件，只需要在began中设置操作 */

        auto ev = EventListenerTouchOneByOne::create();

        ev->onTouchBegan = [&](Touch*touch, Event*){

            /* 如果大象已经死掉了，就不能再处理触摸 */

            if (_hp <= 0)

                return true;

 

            Node* node =getChildByTag(100); // node是大象精灵

            Vec2 touchPoint =touch->getLocation();

            Rect rc =node->getBoundingBox();

 

            if(rc.containsPoint(touchPoint))

            {   _hp-= 8; // 大象少血

                _timer->setPercentage(_hp*100.0/ _maxHP);

                if (_hp <= 0)

                {

node->getChildByTag(101)->removeFromParent();//删掉进度条

 

                    RotateBy* r =RotateBy::create(1.0f, 360);

                //  CallFunc* call =CallFunc::create(CC_CALLBACK_0(Sprite::removeFromParent, node));也可以用CallFunc，正好removeFromParent也是0参的

                    RemoveSelf* remove =RemoveSelf::create();//专门的删除动作，会调用RemoveFromParent

                    Sequence* seq =Sequence::create(r, remove, NULL);

 

                    node->stopAllActions();//先停止MoveBy动作

                    node->runAction(seq); //运行旋转消失动作

                }

            }

            return true;

        };

        this->_eventDispatcher->addEventListenerWithSceneGraphPriority(ev,this);

 

        return true;}

 

总结：

1.      RemoveSelf动作

2.      精灵之间的绑定关系

3.      0参的callfunc和Sequence组合