8.【cocos2d翻译系列】Actions, Transformations and Effects--Ease actions

Ease actions

 

Actions:Ease(缓和)

Ease 动作是一个特殊的动作，它会修改action的时间。在flash里他经常被叫做Tweening或者Easing action。

这种action修改actions的速度，但是不会修改总的运行时间。如果原来action持续5秒，那么修改后总的时间仍然持续5秒。

 

Ease action修改线性的时间。

 

 

例如它可以加速或减速动作的速度。

 

这些actions可以分为3类：

•  In actions:在动作的开始加速
•  Out actions:在动作的末尾加速。
•  
InOut actions:在动作的开头和末尾都加速。

想要了解更多Easing 或者Tweening 动作，访问下面任何一个页面：

•    http://hosted.zeh.com.br/tweener/docs/en-us/misc/transitions.html
•    http://www.robertpenner.com/easing/easing_demo.html

Ease actions

 

他们加速内部的action如下：

-(void)update:(ccTime)t{

    [inner update:powf(t,rate)]; 

}

变种：

• CCEaseIn:在开始处加速
• CCEaseOut:在结尾处加速
•  CCEaseInOut:在开头和结尾处加速

参数rate表明了加速度比例。

例如：

// acceleration at the beginning

id action= [CCMoveTo actionWithDuration:2 position:ccp(100,100)]; 

id ease= [CCEaseIn actionWithAction:action rate:2];

[sprite runAction:ease];

// acceleration at the end

id action= [CCMoveTo actionWithDuration:2 position:ccp(100,100)]; 

id ease= [CCEaseOut actionWithAction:action rate:2];


[sprite runAction:ease];

// acceleration at the beginning / end

id action= [CCMoveTo actionWithDuration:2 position:ccp(100,100)]; 

id ease= [CCEaseInOut actionWithAction:action rate:2];

[sprite runAction:ease];

EaseExponential actions

可用的指数的动作：

• CCEaseExponentialIn
• CCEaseExponentialOut
• CCEaseExponentialInOut

例如：

id scaleAction = [CCScaleTo actionWithDuration:2.5 scale:.8];


id easeAction =[CCEaseExponentialIn actionWithAction:scaleAction];

 [label runAction:easeAction];

EaseSine actions

可用的正弦动作：

• CCEaseSineIn
• CCEaseSineOut
• CCEaseSineInOut

例如：

// Sine at the beginning

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseSineIn actionWithAction:move];


[spriterunAction:action];

// Sine at the end

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseSineOut actionWithAction:move];


[sprite runAction:action];

// Sine at the beginning and at theend

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseSineInOut actionWithAction:move];

[sprite runAction:action];

EaseElastic actions

这种动作模拟弹性的变化修改时间，将会使用的大于1和小于0的时间值，所以内部的动作要做好准备处理特殊的值。

 

一些值将会被触发好几次，所以，内部动作要准备好处理这些值。简单地action像：CCMoveBy,CCScaleBy,CCRotateBy和EaseElastic动作搭配的很好，但是像CCSequence或者CCSpawn动作他们的结果是不可预料的。

可用的动作：

• CCEaseElasticIn
• CCEaseElasticOut
• CCEaseElasticInOut

例子；

// 'period' is how elastic is the action.

// recommended values: between 0.3 and 0.45

// Elastic at the beginning

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseElasticIn actionWithAction:move period:0.3f];

[sprite runAction:action];

// Elastic at the end

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseElasticOut actionWithAction:move period:0.3f];

[sprite runAction:action];

// Elastic at the beginning and atthe end

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];


id action= [CCEaseElasticInOut actionWithAction:move period:0.3f];

[sprite runAction:action];

EaseBounce actions

EaseBounce动作模拟弹跳的动作特效。

 

一些值将会被触发好几次，所以，内部动作要准备好处理这些值。简单地action像：CCMoveBy,CCScaleBy,CCRotateBy和EaseElastic动作搭配的很好，但是像CCSequence或者CCSpawn动作他们的结果是不可预料的。

可用动作：

• CCEaseBounceIn
• CCEaseBounceOut
• CCEaseBounceInOut

例如:

// Bounce at the beginning

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseBounceIn actionWithAction:move];


[spriterunAction:action];

// Bounce at the end

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseBounceOut actionWithAction:move];


[spriterunAction:action];

// Bounce at the beginning and atthe end

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseBounceInOut actionWithAction:move]

;
[spriterunAction:action];

EaseBack actions

一些值将会被触发好几次，所以，内部动作要准备好处理这些值。简单地action像：CCMoveBy,CCScaleBy,CCRotateBy和EaseElastic动作搭配的很好，但是像CCSequence或者CCSpawn动作他们的结果是不可预料的。

可用的动作：

• CCEaseBackIn
• CCEaseBackOut
• CCEaseBackInOut

例子：

// Back at the beginning

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseBackIn actionWithAction:move];


[sprite runAction:action];

// Back at the end

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseBackOut actionWithAction:move];


[spriterunAction:action];

// Back at the beginning and at theend

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];

id action= [CCEaseBackInOut actionWithAction:move];


[spriterunAction:action];

 

Actions: Speed

Speed action（速度动作）

The CCSpeedaction modifies the duration of the inner action.

CCSpeed动作修改内部动作的持续时间。

id move= [CCMoveBy actionWithDuration:3 position:ccp(350,0)];


id action= [CCSpeed actionWithAction:move speed:1.0f];// no speed modification

// but you can modify the speedlater
[action setSpeed:2.5f];// speed is 2.5 faster

[action setSpeed:0.5f];// speed is 0.5 faster (it means 2times slower)