cocos2dx 3.x 动作的认识

1. MoveTo 和 MoveBy

MoveTo 就是移动到指定坐标的一个动作。

MoveTo::create(float duration, const Vec2& deltaPosition)

float duration ：动作执行持续时间，单位为秒。

const Vec2& deltaPosition：指定移动的目的坐标。

MoveBy就是移动距离

MoveBy::create(float duration, const Vec2& deltaPosition)

float duration ：动作执行持续时间，单位为秒。

const Vec2& deltaPosition：指定移动的距离。

auto sprite = Sprite::create("sprite.png");

// position the sprite on the center of the screen
sprite->setPosition(Vec2(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));

// add the sprite as a child to this layer
this->addChild(sprite, 0);

//创建MoveTo动作对象
auto moveto = MoveTo::create(0.9f,Point(100,100));

//创建Moveby动作对象
auto moveby = MoveBy::create(0.9f,Point(100,100));

//精灵执行动作
//sprite->runAction(moveto);

sprite->runAction(moveby);

2. ScaleTo 和ScaleBy

scaleTo：不管精灵当前的拉伸倍数是多少，它都会把精灵缩放到指定的倍数。

ScaleTo::create(float duration, float sx, float sy)

float duration：动作的持续时间，单位为秒

float sx ：X方向的拉伸值

float sy：Y方向的拉伸值

scaleBy：是在精灵当前的拉伸倍数的基础上，再次进行拉伸。例如精灵当前的拉伸倍数2.0，指定精灵x拉伸2.0f，y拉伸1.0f，则精灵的当前x拉伸倍数变为4.0f，就是在原来的2.0的基础上x再放大两倍。

ScaleBy::create(float duration, float sx, float sy)

float duration：动作的持续时间，单位为秒

float sx ：X方向的拉伸值

float sy：Y方向的拉伸值

auto sprite = Sprite::create("sprite.png");
// position the sprite on the center of the screen
sprite->setPosition(Vec2(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));

auto sprite2 = Sprite::create("sprite.png");
// position the sprite on the center of the screen
sprite2->setPosition(Vec2(visibleSize.width/2 + 200, visibleSize.height/2 + origin.y));
sprite2->setScale(2.0f);

auto sprite3 = Sprite::create("sprite.png");
// position the sprite on the center of the screen
sprite3->setPosition(Vec2(visibleSize.width/2 - 200, visibleSize.height/2 + origin.y));
sprite3->setScale(2.0f);

// add the sprite as a child to this layer
this->addChild(sprite, 0);
this->addChild(sprite2, 1);
this->addChild(sprite3);

//创建ScaleTo对象
auto scaleTo = ScaleTo::create(2.8f,1.0f,1.0f);

//创建ScaleBy对象
auto scaleBy = ScaleBy::create(2.8f,2.0f,1.0f);

//精灵执行动作

sprite3->runAction(scaleTo);
sprite2->runAction(scaleBy);

3. Blink 精灵闪烁

Blink::create(float duration, int blinks)

float duration：动作持续时间，单位为秒

int blinks：闪烁次数

auto sprite4 = Sprite::create("sprite.png");
sprite4->setPosition(Vec2(visibleSize.width/2 - 300, visibleSize.height/2 + origin.y));
sprite4->setScale(2.0f);
this->addChild(sprite4);

//创建Blink动作对象
auto blink = Blink::create(3.0f,3);

sprite4->runAction(blink);

4.BezierTo和BezierBy

创建贝塞尔曲线动作需要一个ccBezierConfig 对象，找个对象有3个属性：

bezier.controlPoint_1 ：波谷偏向值
bezier.controlPoint_2 ：波峰偏小值
bezier.endPosition ：动作终点位置

BezierTo 直接移动到各个坐标点

BezierBy 是在精灵当前位置为基准进行移动的。

//创建贝塞尔曲线的配置
ccBezierConfig bezier;
bezier.controlPoint_1 = Point(100,0);
bezier.controlPoint_2 = Point(200,250);
bezier.endPosition = Point(300,0);
//创建BezierTo动作对象
auto bezierTo = BezierTo::create(3.0f,bezier);

//创建BezierBy动作对象
//auto bezierBy = BezierBy::create(3.0f,bezier);

sprite5->runAction(bezierTo);
//sprite5->runAction(bezierBy);

5. repeatForever 和 repeat

repeatForever ：创建一个永久性重复动作。

repeat：创建一个指定次数的动作。

auto sprite6 = Sprite::create("sprite.png");
sprite6->setPosition(Vec2(visibleSize.width/2 - 300, visibleSize.height/2 +100));
this->addChild(sprite6);

auto jumpBy = JumpBy::create(3.0f,Point(50,1),100,1);
//以jumpBy为参数，创建个永久性的重复动作
auto repeatForever = RepeatForever::create(jumpBy);

//以jumpBy为参数，创建个指定次数的重复动作
auto repeat = Repeat::create(jumpBy,3);

//sprite6->runAction(repeatForever);
sprite6->runAction(repeat);

6. Sequence和Spawn

Spawn：让所有的动作一起播放

Sequence：让动作一个一个播放

auto sprite = Sprite::create("sprite.png");
sprite->setPosition(Vec2(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
this->addChild(sprite, 0);

//创建一个移动动作对象
auto moveBy = MoveBy::create(2.2f,Point(40,20));

//创建一个弹跳动作
auto  jumpBy = JumpBy::create(3.0f,Point(50,1),100,5);

//创建一个旋转动作
auto rotateBy = RotateBy::create(2.5f,220,10);

auto actions = Sequence::create(moveBy,jumpBy,rotateBy,NULL);

//auto actions = Spawn::create(moveBy,jumpBy,rotateBy,NULL);

//循环播放
//auto repeat = RepeatForever::create(actions);
sprite->runAction(actions);

7. 动作监听

CallFunc 它的动作就是回调一个函数。使用CC_CALLBACK_0创建要回调的函数。

bool ActionTest::init()
{
    // 1. super init first
    if ( !Layer::init() )
    {
        return false;
    }

    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();

    auto sprite = Sprite::create("sprite.png");
    sprite->setPosition(Vec2(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
    this->addChild(sprite, 0);

    //创建一个移动动作对象
    auto moveBy = MoveBy::create(2.2f,Point(40,20));

    //创建一个弹跳动作
    auto  jumpBy = JumpBy::create(3.0f,Point(50,1),100,5);

    //创建一个旋转动作
    auto rotateBy = RotateBy::create(2.5f,220,10);

    //auto actions = Sequence::create(moveBy,jumpBy,rotateBy,NULL);

    //auto actions = Spawn::create(moveBy,jumpBy,rotateBy,NULL);

    //循环播放
    //auto repeat = RepeatForever::create(actions);


    auto moveto = MoveTo::create(10.0f,Vec2(visibleSize.width, visibleSize.height/2 + origin.y));

    auto callfunc = CallFunc::create(CC_CALLBACK_0(ActionTest::backhome,this));

    auto actions = Sequence::create(moveto,callfunc,NULL);
    sprite->runAction(actions);
    return true;
}

void ActionTest::backhome()
{
    auto lable = LabelTTF::create("I am Home!","Arial",35);
    lable->setPosition(Point(300,300));
    this->addChild(lable);
}