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IDCCInteger* pIndex = (CCInteger*)s_TouchesIntergerDict.objectForKey(id);int nUnusedIndex = 0;// it is a new touchif (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。
想起那座山，那个城，那些人……
