Learning Cocos2d-x for WP8（8）——动作Action

原文:Learning Cocos2d-x for WP8（8）——动作Action

游戏很大程度上是由动作画面支撑起来的。

动作分为两大类：瞬间动作和延时动作。

瞬间动作基本等同于设置节点的属性，延时动作会执行一段时间，不需要清除这两种动作，一旦动作完成，就会从节点上清除并释放所占内存。

封装CCSpriteBatchNode的使用方法

BatchAnimatitonSprite

 CCSprite* SpriteActionLayer::BatchAnimatitonSprite(CCLayer* pLayer,CCSprite *pSprite, CCPoint* spriteStartPoint, const char *strFramesFileName,const char *strFramesFileNameImg,const char *strFirstFrameName,const char *strEachFrameName,int frameCount,float frameDelay)
 {
     //CCSpriteBatchNode
     //创建批处理节点，读取plist文件
     CCSpriteFrameCache* cache=CCSpriteFrameCache::sharedSpriteFrameCache();
     cache->addSpriteFramesWithFile(strFramesFileName,strFramesFileNameImg);

     //起始精灵
     pSprite=CCSprite::spriteWithSpriteFrameName(strFirstFrameName);//纹理plist中包含strfirstFrameName
     pSprite->setPosition(ccp(spriteStartPoint->x,spriteStartPoint->y));    

     CCSpriteBatchNode* spritebatch = CCSpriteBatchNode::batchNodeWithFile(strFramesFileNameImg);//与CCSpriteFrameCache同一纹理
     spritebatch->addChild(pSprite);
     pLayer->addChild(spritebatch,);

     //创建逐帧数组
     CCMutableArray<CCSpriteFrame*>* animFrames1=new CCMutableArray<CCSpriteFrame*>(frameCount);
     char str1[]={};
     for(int i=;i<frameCount;i++)
     {
         sprintf(str1,strEachFrameName,i);
         CCSpriteFrame* pFrame=cache->spriteFrameByName( str1 );
         animFrames1->addObject(pFrame);
     }

     CCAnimation* animation1=CCAnimation::animationWithFrames(animFrames1,frameDelay);
     pSprite->runAction(CCRepeatForever::actionWithAction(CCAnimate::actionWithAnimation(animation1,false)));

     animFrames1->release();
     return pSprite;
 }

重复动作

可以使一个动作或一系列的动作不停地重复无限循环，除非“外力”使其停止。

实例

     //重复动作
     CCSprite *role0=CCSprite::spriteWithFile("Sprite/Role.png");
     role0->setPosition(ccp(,s.height-));
     addChild(role0,);
     CCRotateBy* role0RotateBy=CCRotateBy::actionWithDuration(2.0f,);
     CCRepeatForever* role0Repeat=CCRepeatForever::actionWithAction(role0RotateBy);
     role0->runAction(role0Repeat);

Sprite循环不停地旋转

流畅动画

CCEaseAction类能在一段时间内动作的流畅执行，使得更强大。而非简单地执行简单动画效果。

在实际运动过程中，匀速运动在启动和结束时往往会有一定的加速和减速的效果，这样更加的真实。

cocoos2d-x引擎提供了相关的API，免除了我们编写相关的算法实现的烦恼，实现起来相当的方便。

实现该方法的是CCActionEase中CCEaseRateAction系列，大体分成三类：

In：开始时候的加速度

Out：结束时候的加速度

InOut：开始结束时候的加速度

（以下图片来源其他博文，具体地址忘记了，以后再加上）

1.指数缓冲

EaseExponentialIn

EaseExponentialOut

EaseExponentialInOut

2.赛因缓冲

EaseSineIn

EaseSineOut

EaseSineInOut

3.弹性缓冲

EaseElasticIn

EaseElasticOut

EaseElasticInOut

4.跳跃缓冲

EaseBounceIn

EaseBounceOut

EaseBounceInOut

5.回震缓冲

EaseBackIn

EaseBackOut

EaseBackInOut

实例

     //流畅动画
     CCSprite* role1=NULL;
     role1=SpriteActionLayer::BatchAnimatitonSprite(this,role1,new CCPoint(,s.height/),"Sprite/Plist/RoleRun.plist","Sprite/Plist/RoleRun.png","RoleRun0.png","RoleRun%d.png",,0.2f);
     CCMoveTo* role1Move=CCMoveTo::actionWithDuration(,CCPointMake(s.width-,s.height/));//CCMoveTo绝对位置移动
     CCEaseInOut* role1MoveEase=CCEaseInOut::actionWithAction(role1Move,);//rate=4,决定流畅动画的明显程度，只有当它大于1时才能看到效果
     role1->runAction(role1MoveEase);

可见，Sprite开始缓慢移动——加速——缓慢停止。

动作序列

通常情况下，Action动作执行添加多个动作时，它们会在同一时间运行，如上面的动作。但有时我们需要让动作一个接着一个运行。CCSequence将实现该功能。

实例

     //动作序列
     CCSprite* role2=NULL;
     role2=SpriteActionLayer::BatchAnimatitonSprite(this,role2,new CCPoint(,s.height/),"Sprite/Plist/Role2Run.plist","Sprite/Plist/Role2Run.png","Role2Run0.png","Role2Run%d.png",,0.3f);
     CCMoveBy* role2MoveBy=CCMoveBy::actionWithDuration(,CCPointMake(,));//CCMoveBy相对位置移动
     CCJumpBy* role2JumpBy=CCJumpBy::actionWithDuration(,CCPointMake(-,),,);//CCJumpBy相当位置jump
     role2->runAction(CCSequence::actions(role2MoveBy,role2JumpBy,NULL));

Sprite跑动到指定位置后，下个动作就是弹跳回起始位置

瞬间动作

有时在一串动作中，需要改变Sprite的属性，然后在继续执行下个动作。瞬间动作将实现该功能，通常情况下依赖与CCCallFunc动作。

实例

     //瞬时动作
     CCSprite* role3=CCSprite::spriteWithFile("Sprite/Role.png");
     role3->setPosition(ccp(s.width-,s.height-));
     addChild(role3,);
     CCScaleTo * role3ScaleTo=CCScaleTo::actionWithDuration(,2.0f);
     CCCallFuncN* role3FunN=CCCallFuncN::actionWithTarget(this,callfuncN_selector(SpriteActionLayer::repeatForever));
     role3->runAction(CCSequence::actions(role3ScaleTo,role3FunN,NULL));

repeatForever方法

 void SpriteActionLayer::repeatForever(CCNode* pSender)
 {
     CCRepeatForever* repeat=CCRepeatForever::actionWithAction(CCSkewBy::actionWithDuration(, 37.2f, -37.2f));//歪斜
     pSender->runAction(repeat);
 }

执行完ScaleTo后执行SkewBy

完整源码

SpriteActionTest.h

 #ifndef _SPRITE_ACTION_TEST_
 #define _SPRITE_ACTION_TEST_

 #include "cocos2d.h"
 using namespace cocos2d;

 class SpriteActionScene:public CCScene
 {
 public:
     SpriteActionScene();
     ~SpriteActionScene();

     virtual void onEnter();

 };

 class SpriteActionLayer:public CCLayer
 {
 public:
     SpriteActionLayer();
     ~SpriteActionLayer();

 public:
     void repeatForever(CCNode* pTarget);
     CCSprite* BatchAnimatitonSprite(CCLayer* pLayer,CCSprite *pSprite,CCPoint* spriteStartPoint,const char *strFramesFileName,const char *strFramesFileNameImg,const char *strFirstFrameName,const char *strEachFrameName,int frameCount,float frameDelay);
 };

 #endif

SpriteActionTest.cpp

 #include "pch.h"
 #include "Classes\SpriteActionTest.h"

 //----------------------------------------
 //
 //SpriteActionLayer
 //
 //----------------------------------------
 SpriteActionLayer::SpriteActionLayer()
 {
     CCSize s=CCDirector::sharedDirector()->getWinSize();

     //重复动作
     CCSprite *role0=CCSprite::spriteWithFile("Sprite/Role.png");
     role0->setPosition(ccp(,s.height-));
     addChild(role0,);
     CCRotateBy* role0RotateBy=CCRotateBy::actionWithDuration(2.0f,);
     CCRepeatForever* role0Repeat=CCRepeatForever::actionWithAction(role0RotateBy);
     role0->runAction(role0Repeat);

     //流畅动画
     CCSprite* role1=NULL;
     role1=SpriteActionLayer::BatchAnimatitonSprite(this,role1,new CCPoint(,s.height/),"Sprite/Plist/RoleRun.plist","Sprite/Plist/RoleRun.png","RoleRun0.png","RoleRun%d.png",,0.2f);
     CCMoveTo* role1Move=CCMoveTo::actionWithDuration(,CCPointMake(s.width-,s.height/));//CCMoveTo绝对位置移动
     CCEaseInOut* role1MoveEase=CCEaseInOut::actionWithAction(role1Move,);//rate=4,决定流畅动画的明显程度，只有当它大于1时才能看到效果
     role1->runAction(role1MoveEase);

     //动作序列
     CCSprite* role2=NULL;
     role2=SpriteActionLayer::BatchAnimatitonSprite(this,role2,new CCPoint(,s.height/),"Sprite/Plist/Role2Run.plist","Sprite/Plist/Role2Run.png","Role2Run0.png","Role2Run%d.png",,0.3f);
     CCMoveBy* role2MoveBy=CCMoveBy::actionWithDuration(,CCPointMake(,));//CCMoveBy相对位置移动
     CCJumpBy* role2JumpBy=CCJumpBy::actionWithDuration(,CCPointMake(-,),,);//CCJumpBy相当位置jump
     role2->runAction(CCSequence::actions(role2MoveBy,role2JumpBy,NULL));

     //瞬时动作
     CCSprite* role3=CCSprite::spriteWithFile("Sprite/Role.png");
     role3->setPosition(ccp(s.width-,s.height-));
     addChild(role3,);
     CCScaleTo * role3ScaleTo=CCScaleTo::actionWithDuration(,2.0f);
     CCCallFuncN* role3FunN=CCCallFuncN::actionWithTarget(this,callfuncN_selector(SpriteActionLayer::repeatForever));
     role3->runAction(CCSequence::actions(role3ScaleTo,role3FunN,NULL));
 }

 void SpriteActionLayer::repeatForever(CCNode* pSender)
 {
     CCRepeatForever* repeat=CCRepeatForever::actionWithAction(CCSkewBy::actionWithDuration(, 37.2f, -37.2f));//歪斜
     pSender->runAction(repeat);
 }

 SpriteActionLayer::~SpriteActionLayer()
 {}

 CCSprite* SpriteActionLayer::BatchAnimatitonSprite(CCLayer* pLayer,CCSprite *pSprite, CCPoint* spriteStartPoint, const char *strFramesFileName,const char *strFramesFileNameImg,const char *strFirstFrameName,const char *strEachFrameName,int frameCount,float frameDelay)
 {
     //CCSpriteBatchNode
     //创建批处理节点，读取plist文件
     CCSpriteFrameCache* cache=CCSpriteFrameCache::sharedSpriteFrameCache();
     cache->addSpriteFramesWithFile(strFramesFileName,strFramesFileNameImg);

     //起始精灵
     pSprite=CCSprite::spriteWithSpriteFrameName(strFirstFrameName);//纹理plist中包含strfirstFrameName
     pSprite->setPosition(ccp(spriteStartPoint->x,spriteStartPoint->y));    

     CCSpriteBatchNode* spritebatch = CCSpriteBatchNode::batchNodeWithFile(strFramesFileNameImg);//与CCSpriteFrameCache同一纹理
     spritebatch->addChild(pSprite);
     pLayer->addChild(spritebatch,);

     //创建逐帧数组
     CCMutableArray<CCSpriteFrame*>* animFrames1=new CCMutableArray<CCSpriteFrame*>(frameCount);
     char str1[]={};
     for(int i=;i<frameCount;i++)
     {
         sprintf(str1,strEachFrameName,i);
         CCSpriteFrame* pFrame=cache->spriteFrameByName( str1 );
         animFrames1->addObject(pFrame);
     }

     CCAnimation* animation1=CCAnimation::animationWithFrames(animFrames1,frameDelay);
     pSprite->runAction(CCRepeatForever::actionWithAction(CCAnimate::actionWithAnimation(animation1,false)));

     animFrames1->release();
     return pSprite;
 }

 //----------------------------------------
 //
 //SpriteActionScene
 //
 //----------------------------------------

 SpriteActionScene::SpriteActionScene()
 {}

 SpriteActionScene::~SpriteActionScene()
 {}

 void SpriteActionScene::onEnter()
 {
     CCScene::onEnter();
     CCLayer* spriteActionLayer=new SpriteActionLayer();
     addChild(spriteActionLayer);
     spriteActionLayer->release();
 }

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