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1、在cocos2dx 点击事件分析（2）中，我们已经从java端分析了，单手触摸和多手触摸屏幕。num    --- 1,不论单点触摸还是多点触摸，这个值都是1ids[]  --- 触摸事件的IDvoid CCEGLViewProtocol::handleTouchesBegin(int num, int ids[], float xs[], float ys[]){    CCSet set;    for (int i = 0; i < num; ++i)    {        int id = ids[i];        float x = xs[i];        float y = ys[i];	//static CCDictionary s_TouchesIntergerDict 存放手指触摸ID，每多一只手，就会产生一个新的ID        CCInteger* pIndex = (CCInteger*)s_TouchesIntergerDict.objectForKey(id);        int nUnusedIndex = 0;        // it is a new touch        if (pIndex == NULL)        {            nUnusedIndex = getUnUsedIndex();            // The touches is more than MAX_TOUCHES ?            if (nUnusedIndex == -1) {                CCLOG("The touches is more than MAX_TOUCHES, nUnusedIndex = %d", nUnusedIndex);                continue;            }	    //s_pTouches 存放触摸信息，CCTouch类中，有一个m_nId的成员变量，和这里就对应nUnusedIndex	    //就对应起来了            CCTouch* pTouch = s_pTouches[nUnusedIndex] = new CCTouch();			pTouch->setTouchInfo(nUnusedIndex, (x - m_obViewPortRect.origin.x) / m_fScaleX,                                      (y - m_obViewPortRect.origin.y) / m_fScaleY);                        //CCLOG("x = %f y = %f", pTouch->getLocationInView().x, pTouch->getLocationInView().y);                        CCInteger* pInterObj = new CCInteger(nUnusedIndex);            s_TouchesIntergerDict.setObject(pInterObj, id);            set.adsdObject(pTouch);            pInterObj->release();        }    }    if (set.count() == 0)    {        CCLOG("touchesBegan: count = 0");        return;    }    //根据我的分析，在这里，set的set.count()值只能是1。    m_pDelegate->touchesBegan(&set, NULL);}-->>void CCTouchDispatcher::touchesBegan(CCSet *touches, CCEvent *pEvent){    if (m_bDispatchEvents)    {        this->touches(touches, pEvent, CCTOUCHBEGAN);    }}-->>//// dispatch events//void CCTouchDispatcher::touches(CCSet *pTouches, CCEvent *pEvent, unsigned int uIndex){   //这个里面的内容，后面分析}验证：cocos2dx的TestCpp例子中有个MutiTouchTest.cpp的例子，大家可以在那个例子里面打印一些信息。下面是我添加了一些打印信息后的源码：#include "MutiTouchTest.h"#include "cocos2d.h"static ccColor3B s_TouchColors[CC_MAX_TOUCHES] = {    ccYELLOW,    ccBLUE,    ccGREEN,    ccRED,    ccMAGENTA};class TouchPoint : public CCNode{public:    TouchPoint()    {        setShaderProgram(CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureColor));    }    virtual void draw()    {        ccDrawColor4B(m_TouchColor.r, m_TouchColor.g, m_TouchColor.b, 255);        glLineWidth(10);        ccDrawLine( ccp(0, m_pTouchPoint.y), ccp(getContentSize().width, m_pTouchPoint.y) );        ccDrawLine( ccp(m_pTouchPoint.x, 0), ccp(m_pTouchPoint.x, getContentSize().height) );        glLineWidth(1);        ccPointSize(30);        ccDrawPoint(m_pTouchPoint);    }    void setTouchPos(const CCPoint& pt)    {        m_pTouchPoint = pt;    }    void setTouchColor(ccColor3B color)    {        m_TouchColor = color;    }    static TouchPoint* touchPointWithParent(CCNode* pParent)    {        TouchPoint* pRet = new TouchPoint();        pRet->setContentSize(pParent->getContentSize());        pRet->setAnchorPoint(ccp(0.0f, 0.0f));        pRet->autorelease();        return pRet;    }private:    CCPoint m_pTouchPoint;    ccColor3B m_TouchColor;};bool MutiTouchTestLayer::init(){    if (CCLayer::init())    {        setTouchEnabled(true);        return true;    }    return false;}static CCDictionary s_dic;void MutiTouchTestLayer::registerWithTouchDispatcher(void){    CCDirector::sharedDirector()->getTouchDispatcher()->addStandardDelegate(this, 0);}void MutiTouchTestLayer::ccTouchesBegan(CCSet *pTouches, CCEvent *pEvent){    CCLog("ccTouchesBegan++++++ %d", pTouches->count());    CCSetIterator iter = pTouches->begin();    for (; iter != pTouches->end(); iter++)    {        CCTouch* pTouch = (CCTouch*)(*iter);        TouchPoint* pTouchPoint = TouchPoint::touchPointWithParent(this);        CCPoint location = pTouch->getLocation();        pTouchPoint->setTouchPos(location);        pTouchPoint->setTouchColor(s_TouchColors[pTouch->getID()]);        addChild(pTouchPoint);        s_dic.setObject(pTouchPoint, pTouch->getID());        CCLog("ccTouchesBegan++ID++++ %d", pTouch->getID());    }    }void MutiTouchTestLayer::ccTouchesMoved(CCSet *pTouches, CCEvent *pEvent){    CCLog("ccTouchesMoved++++++ %d", pTouches->count());    CCSetIterator iter = pTouches->begin();    for (; iter != pTouches->end(); iter++)    {        CCTouch* pTouch = (CCTouch*)(*iter);        TouchPoint* pTP = (TouchPoint*)s_dic.objectForKey(pTouch->getID());        CCPoint location = pTouch->getLocation();        pTP->setTouchPos(location);        CCLog("ccTouchesMoved++ID++++ %d", pTouch->getID());    }}void MutiTouchTestLayer::ccTouchesEnded(CCSet *pTouches, CCEvent *pEvent){    CCSetIterator iter = pTouches->begin();    for (; iter != pTouches->end(); iter++)    {        CCTouch* pTouch = (CCTouch*)(*iter);        TouchPoint* pTP = (TouchPoint*)s_dic.objectForKey(pTouch->getID());        removeChild(pTP, true);        s_dic.removeObjectForKey(pTouch->getID());    }}void MutiTouchTestLayer::ccTouchesCancelled(CCSet *pTouches, CCEvent *pEvent){    ccTouchesEnded(pTouches, pEvent);}void MutiTouchTestScene::runThisTest(){    MutiTouchTestLayer* pLayer = MutiTouchTestLayer::create();    addChild(pLayer, 0);    CCDirector::sharedDirector()->replaceScene(this);}1、03-30 13:13:14.192: D/cocos2d-x debug info(22995): ccTouchesBegan++++++ 103-30 13:13:14.192: D/cocos2d-x debug info(22995): ccTouchesBegan++ID++++ 003-30 13:13:14.312: D/cocos2d-x debug info(22995): ccTouchesBegan++++++ 103-30 13:13:14.312: D/cocos2d-x debug info(22995): ccTouchesBegan++ID++++ 12、03-30 13:13:14.773: D/cocos2d-x debug info(22995): ccTouchesMoved++++++ 203-30 13:13:14.773: D/cocos2d-x debug info(22995): ccTouchesMoved++ID++++ 103-30 13:13:14.773: D/cocos2d-x debug info(22995): ccTouchesMoved++ID++++ 0

总结：在ccTouchesBegan函数中，即使是多点触控，每次也只会有一个触摸事件，但是前后两个手指的触摸事件会分配不同的ID，而在ccTouchesMoved里面，会同时传递多点触控的所有点的触摸信息。

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