CCTouch的单点触摸与精灵拖动（1）

目的：用CCTouch实现单点触摸和精灵拖拽

过程：1、在.h头文件中定义

CCSprite *selSprite;   CCArray *movableSprite;   bool ccTouchBegan(CCTouch *touch,CCEvent *event);   void selectSpriteForTouch(CCPoint touchLocation);

2、.m文件中重写 init( ) 方法如下：

bool HelloWorld::init(){//////////////////////////////// 1. super init firstif ( !CCLayer::init() ){return false;}CCSprite *background = CCSprite::create("background.png");background->setAnchorPoint(CCPointZero);background->setPosition(CCPointZero);background->setScale(3);//背景图片放大3倍this->addChild(background);movableSprite = CCArray::create();CCSprite *Player = CCSprite::create("Player.png");CCSprite *Projectile = CCSprite::create("Projectile.png");CCSprite *Target = CCSprite::create("Target.png");movableSprite->addObject(Player);movableSprite->addObject(Projectile);movableSprite->addObject(Target);for (int i = 0; i < movableSprite->count(); i++) {CCSprite *sprite = (CCSprite *)movableSprite->objectAtIndex(i);sprite->setPosition(ccp(300 + 200*i, 300));sprite->setScale(2.0);this->addChild(sprite);}movableSprite->retain();CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, true);//Dont forget this!!!return true;}

3、实现头文件定义的两个方法

bool HelloWorld::ccTouchBegan(cocos2d::CCTouch *touch, cocos2d::CCEvent *event){CCPoint touchLocation = this->convertTouchToNodeSpace(touch);this ->selectSpriteForTouch(touchLocation); return true;}void HelloWorld::selectSpriteForTouch(cocos2d::CCPoint touchLocation){CCSprite *newSprite = NULL;for (int  i = 0; movableSprite->count(); i++) {CCSprite *sprite = (CCSprite *)movableSprite->objectAtIndex(i);if (sprite->boundingBox().containsPoint(touchLocation)) {newSprite = sprite;break;}}if (newSprite != selSprite) {if (selSprite != NULL) {selSprite->stopAllActions();}CCRotateBy *rotLeft = CCRotateBy::create(0.1, -50);CCRotateBy *center = CCRotateBy::create(0.1, 0);CCRotateBy *rotRight = CCRotateBy::create(0.1, 50);CCFiniteTimeAction *rotSeq = CCSequence::create(rotLeft,center,rotRight,center,NULL);newSprite->runAction(CCRepeatForever::create((CCActionInterval *)rotSeq));selSprite = newSprite;}}

运行结果如下：(单你点击精灵的时候精灵会在0.1秒内左右来回50角晃动)

note:该程序有一个bug，单你多次来回点击精灵的时候，，精灵晃动停止后会旋转一定的角度，，我也不知道为什么，刚学习有很多不懂，先留着，以后再回来看！

精灵拖动：

代码如下：

#include "HelloWorldScene.h"#include "SimpleAudioEngine.h"using namespace cocos2d;using namespace CocosDenshion;CCScene* HelloWorld::scene(){    // 'scene' is an autorelease object    CCScene *scene = CCScene::create();        // 'layer' is an autorelease object    HelloWorld *layer = HelloWorld::create();    // add layer as a child to scene    scene->addChild(layer);    // return the scene    return scene;}// on "init" you need to initialize your instancebool HelloWorld::init(){    //////////////////////////////    // 1. super init first    if ( !CCLayer::init() )    {        return false;    }        CCSprite *background = CCSprite::create("background.png");    background->setAnchorPoint(CCPointZero);    background->setPosition(CCPointZero);    background->setScale(3);//背景图片放大3倍    this->addChild(background);        movableSprite = CCArray::create();    CCSprite *Player = CCSprite::create("Player.png");    CCSprite *Projectile = CCSprite::create("Projectile.png");    CCSprite *Target = CCSprite::create("Target.png");        movableSprite->addObject(Player);    movableSprite->addObject(Projectile);    movableSprite->addObject(Target);        for (int i = 0; i < movableSprite->count(); i++) {        CCSprite *sprite = (CCSprite *)movableSprite->objectAtIndex(i);        sprite->setPosition(ccp(300 + 200*i, 300));        sprite->setScale(2.0);        this->addChild(sprite);    }        movableSprite->retain();        CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, true);        return true;}bool HelloWorld::ccTouchBegan(cocos2d::CCTouch *touch, cocos2d::CCEvent *event){    CCPoint touchLocation = this->convertTouchToNodeSpace(touch);    this ->selectSpriteForTouch(touchLocation);    return true;}void HelloWorld::ccTouchMoved(cocos2d::CCTouch *touch, cocos2d::CCEvent *event){    CCPoint touchLocation = this->convertTouchToNodeSpace(touch);    CCPoint oldTouchLocation = touch->getPreviousLocationInView();    oldTouchLocation = CCDirector::sharedDirector()->convertToGL(oldTouchLocation);//转换成openGL的坐标    oldTouchLocation = this->convertToNodeSpace(oldTouchLocation);//转换成屏幕坐标    CCPoint tranlation = ccpSub(touchLocation, oldTouchLocation);//相对坐标（相对位移 ），计算两者之差    this->panForTranslation(tranlation);}void HelloWorld::panForTranslation(cocos2d::CCPoint translation){    CCPoint newPos = ccpAdd(selSprite->getPosition(), translation);//原有位置+相对位移    selSprite->setPosition(newPos);}void HelloWorld::selectSpriteForTouch(cocos2d::CCPoint touchLocation){    CCSprite *newSprite = NULL;    for (int  i = 0; movableSprite->count(); i++) {        CCSprite *sprite = (CCSprite *)movableSprite->objectAtIndex(i);        if (sprite->boundingBox().containsPoint(touchLocation)) {            newSprite = sprite;            break;        }    }        if (newSprite != selSprite) {        if (selSprite != NULL) {            selSprite->stopAllActions();        }        CCRotateBy *rotLeft = CCRotateBy::create(0.1, -50);        CCRotateBy *center = CCRotateBy::create(0.1, 0);        CCRotateBy *rotRight = CCRotateBy::create(0.1, 50);        CCFiniteTimeAction *rotSeq = CCSequence::create(rotLeft,center,rotRight,center,NULL);        newSprite->runAction(CCRepeatForever::create((CCActionInterval *)rotSeq));        selSprite = newSprite;    }}void HelloWorld::menuCloseCallback(CCObject* pSender){    CCDirector::sharedDirector()->end();#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)    exit(0);#endif}

运行结果如下：