Cocos2d-x学习笔记（十一）动作

动作类Action是一切动作的祖先类。它有三个直接继承子类：

1. FiniteTimeAction受时间限制的动作；
2. Follow精灵跟随精灵的动作；
3. Speed运动速度控制；

而FiniteTimeAction又有两个直接子类：分别是ActionInstant和ActionInterval，顾类名而思意。

瞬时动作即立即执行动作，下边是其使用示例：

void MyAction::goMenu(cocos2d::Ref *pSender)

{

    log("Tag = %i", this->getTag());

    Size size = Director::getInstance()->getVisibleSize();

    Vec2 p = Vec2(CCRANDOM_0_1()*size.width, CCRANDOM_0_1()*size.height);



    switch (this->getTag())

    {

        case PLACE_TAG:

            sprite->runAction(Place::create(p));// Places the node in a certain position

            break;

        case FLIPX_TAG:

            sprite->runAction(FlipX::create(true));// Flips the sprite horizontally

            break;

        case FLIPY_TAG:

            sprite->runAction(FlipY::create(true));// Flips the sprite vertically

            break;

        case HIDE_SHOW_TAG:

            if (hiddenFlag)

            {

                sprite->runAction(Hide::create());// Hide the node

                hiddenFlag = false;

            }

            else

            {

                sprite->runAction(Show::create());// Show the node

                hiddenFlag = true;

            }

            break;

        case TOGGLE_TAG:

            sprite->runAction(ToggleVisibility::create());// Toggles the visibility of a node

            break;

        default:

            break;

    }

}

    

void MyAction::backMenu(cocos2d::Ref *pSender)

{

    auto sc = HelloWorld::createScene();

    // Slide in the incoming scene from the left border.

    auto reScene = TransitionSlideInL::create(1.0f, sc);

    Director::getInstance()->replaceScene(reScene);

}

View Code

在goMenu()函数中的动作类都是ActionInstant的子类；

void HelloWorld::OnClickMenu(cocos2d::Ref *pSender)

{

    MenuItem *nmitem = (MenuItem*)pSender;



    auto sc = Scene::create();

    auto layer = MyAction::create();

    layer->setTag(nmitem->getTag());// set layer's tag, and this should be the most important part in this func.



    sc->addChild(layer);



    auto reScene = TransitionSlideInR::create(1.0f, sc);

    Director::getInstance()->replaceScene(reScene);

}

View Code

运行结果：

图1 HelloWorld层

 

图2 MyAction层

注意：这里的聚焦貌似没那么准确。

 

以下为间隔动作的使用示例：

void MyAction::goMenu(cocos2d::Ref *pSender)

{

    log("Tag = %i", this->getTag());

    Size size = Director::getInstance()->getVisibleSize();



    ccBezierConfig bezier;



    switch (this->getTag())

    {

        case kMoveTo:

            // 第一个参数为移动持续时间，第二个参数为目标位置

            sprite->runAction(MoveTo::create(2,Vec2(size.width-50, size.height-50)));

            break;

        case kMoveBy:

            sprite->runAction(MoveBy::create(2,Vec2(-50, -50)));

            break;

        case kJumpTo:

            // 第一个参数为持续时间，第二个参数为目标位置，第三个参数为高度，第四个参数为跳跃次数

            sprite->runAction(JumpTo::create(2,Vec2(150, 50), 30, 5));

            break;

        case kJumpBy:

            sprite->runAction(JumpBy::create(2,Vec2(100, 100),30,5));

            break;

        case kBezierBy:

            bezier.controlPoint_1 = Vec2(0, size.height/2);

            bezier.controlPoint_2 = Vec2(300, -size.height/2);

            bezier.endPosition = Vec2(100, 100);

            sprite->runAction(BezierBy::create(3, bezier));

            break;

        case kScaleTo:

            // 第一个参数为持续时间，第二个参数为缩放比例

            sprite->runAction(ScaleTo::create(2, 4));

            break;

        case kScaleBy:

            sprite->runAction(ScaleBy::create(2, 0.5));

            break;

        case kRotateTo:

            // 第一个参数为持续时间，第二参数为旋转角度

            sprite->runAction(RotateTo::create(2, 180));

            break;

        case kRotateBy:

            sprite->runAction(RotateBy::create(2, -180));

            break;

        case kBlink:

            // 第一个参数为持续时间，第二个参数为闪烁次数

            sprite->runAction(Blink::create(3, 5));

            break;

        case kTintTo:

            // 第一个参数为持续时间，剩余参数对应RGB

            sprite->runAction(TintTo::create(2, 255, 0, 0));

            break;

        case kTintBy:

            sprite->runAction(TintBy::create(0.5, 0, 255, 255));

            break;

        case kFadeTo:

            // 第一个参数为持续时间，第二个参数为不透明度（百分数）

            sprite->runAction(FadeTo::create(1, 80));

            break;

        case kFadeIn:

            sprite->setOpacity(10);// 0~255，0位完全透明

            // 参数为持续时间

            sprite->runAction(FadeIn::create(1));

            break;

        case kFadeOut:

            sprite->runAction(FadeOut::create(1));

            break;

        default:

            break;

    }

}

View Code

 

动作的速度控制示例：

void MyAction::goMenu(Ref* pSender)

{   

    log("Tag = %i",this->getTag());

    FiniteTimeAction * ac1 = (FiniteTimeAction *)MoveBy::create(2, Vec2(200, 0));

    FiniteTimeAction * ac2 = ((FiniteTimeAction *)ac1)->reverse();

    

    ActionInterval * ac = Sequence::create(ac1, ac2, NULL);

    

    switch (this->getTag()) {

        case kEaseIn:

            // 3倍速度由慢至快

            sprite->runAction(EaseIn::create(ac, 3));

            break;

        case kEaseOut:

            sprite->runAction(EaseOut::create(ac, 3));

            break;

        case kEaseInOut:

            sprite->runAction(EaseInOut::create(ac, 3));

            break;

        case kEaseSineIn:

            // 采用正弦变换由慢至快

            sprite->runAction(EaseSineIn::create(ac));

            break;

        case kEaseSineOut:

            sprite->runAction(EaseSineOut::create(ac));

            break;

        case kEaseSineInOut:            

            sprite->runAction(EaseSineInOut::create(ac));

            break;

        case kEaseExponentialIn:

            // 采用指数变换速度由慢至快

            sprite->runAction(EaseExponentialIn::create(ac));

            break;

        case kEaseExponentialOut:

            sprite->runAction(EaseExponentialOut::create(ac));

            break;

        case kEaseExponentialInOut:

            sprite->runAction(EaseExponentialInOut::create(ac));

            break;

        case kSpeed:

            // 随机变换速度

            sprite->runAction(Speed::create(ac, (CCRANDOM_0_1() * 5)));

            break;

    }

}

View Code