cocos2d-x学习记录3——CCTouch触摸响应

游戏不同于影音，强交互性是其一大特色，在游戏中主要体现为接受用户的输入并响应。智能手机触摸是其重要的输入方式。

在cocos2d-x中，触摸分为单点触摸和多点触摸。

单点触摸：主要继承CCTargetedTouchDelegate 实现。

多点触摸：主要继承CCStandardTouchDelegate实现。

MyScene.h

 #ifndef MyScene_H_H
 #define MyScene_H_H

 #include "cocos2d.h"
 using namespace cocos2d;

 class MyScene : public CCLayer
 {
 public:
     static CCScene* createScene();
     virtual bool init();
     CREATE_FUNC( MyScene );

     virtual bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent);
     virtual void ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent);
     virtual void ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent);
     virtual void ccTouchCancelled(CCTouch *pTouch, CCEvent *pEvent);

     virtual void registerWithTouchDispatcher();

 private:
 };

 #endif

MyScene.cpp

 #include "MyScene.h"

 CCScene* MyScene::createScene()
 {
     CCScene *scene = CCScene::create();
     MyScene *layer = MyScene::create();
     scene->addChild(layer);
     return scene;
 };

 bool MyScene::init()
 {
     if( !CCLayer::init() ){
         return false;
     }

     CCSize size = CCDirector::sharedDirector()->getWinSize();
     CCSprite *sprite = CCSprite::create("pal4.png");
     sprite->setAnchorPoint( ccp(0.5, 0.5) );
     //sprite->setPosition( ccp(size.width/2, size.height/2) );
     sprite->setPosition( ccp(size.width/, size.height/) );
     sprite->setScale(0.5f);
     sprite->setTag();
     addChild(sprite);

     setTouchEnabled(true);

     return true;
 }

 bool MyScene::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent)
 {
     CCPoint point = pTouch->getLocationInView();
     point = CCDirector::sharedDirector()->convertToGL(point);
     CCNode *node = getChildByTag();
     float x = node->getPositionX();
     float y = node->getPositionY();
     float width = node->getContentSize().width*node->getScale();
     float height = node->getContentSize().height*node->getScale();
     //CCRect rect = CCRectMake(node->getPositionX()-node->getContentSize().width/2, node->getPositionY()-node->getContentSize().height/2,
     //                        node->getContentSize().width, node->getContentSize().height);
     CCRect rect = CCRectMake(x-width/, y-height/, width, height);

     //CCLog("Touch start! %.1f,%.1f", point.x, point.y);
     //CCMessageBox("start","info");
     //return true;

     if( rect.containsPoint(point) ){
         CCLog("Touch start! %.1f,%.1f", point.x, point.y);
         return true;
     }

     return false;
 }

 void MyScene::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent)
 {
     CCPoint point = pTouch->getLocation();
     CCLog("Touch moved! %.1f,%.1f", point.x, point.y);
 }

 void MyScene::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent)
 {
     CCPoint point = pTouch->getLocation();
     CCLog("Touch ended! %.1f, %.1f", point.x, point.y);
 }

 void MyScene::ccTouchCancelled(CCTouch *pTouch, CCEvent *pEvent)
 {
     CCPoint point = pTouch->getLocation();
     CCLog("Touch canceled! %.1f, %.1f", point.x, point.y);
 }

 void MyScene::registerWithTouchDispatcher()
 {
     CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, , true);
 }

运行结果：

在TouchStart中，判断按下的点是否在图片显示区域内。如果在，则打出log，并返回true，然后CCTouchMove、CCTouchEnded等事件才会被响应；否则，不会响应。

Touches标准型。多点触摸时，会将所有的触摸点放进一个CCSet中。

 void MyScene::registerWithTouchDispatcher()
 {
     //CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, true);
     CCLayer::registerWithTouchDispatcher();
 }

 void MyScene::ccTouchesBegan(CCSet *pTouches, CCEvent *pEvent)
 {
     if( pTouches->count() ==  ){
         CCTouch *touch = (CCTouch*)(*( pTouches->begin() ));

         CCPoint point = touch->getLocationInView();
         point = CCDirector::sharedDirector()->convertToGL(point);
         CCNode *node = getChildByTag();
         float x = node->getPositionX();
         float y = node->getPositionY();
         float width = node->getContentSize().width*node->getScale();
         float height = node->getContentSize().height*node->getScale();
         CCRect rect = CCRectMake(x-width/, y-height/, width, height);

         //CCLog("Touches start! %.1f,%.1f", point.x, point.y);

         if( rect.containsPoint(point) ){
             CCLog("Touches start! %.1f,%.1f", point.x, point.y);
         }
     }

     //return false;
 }

 void MyScene::ccTouchesMoved(CCSet *pTouches, CCEvent *pEvent)
 {
     if( pTouches->count() ==  ){
         CCTouch *touch = (CCTouch*)(*( pTouches->begin() ));
         CCPoint point = touch->getLocationInView();
         CCLog("Touches moved! %.1f,%.1f", point.x, point.y);
     }
 }

 void MyScene::ccTouchesEnded(CCSet *pTouches, CCEvent *pEvent)
 {
     if( pTouches->count() ==  ){
         CCTouch *touch = (CCTouch*)(*( pTouches->begin() ));
         CCPoint point = touch->getLocationInView();
         CCLog("Touches ended! %.1f,%.1f", point.x, point.y);
     }
 }

 void MyScene::ccTouchesCancelled(CCSet *pTouches, CCEvent *pEvent)
 {
     if( pTouches->count() ==  ){
         CCTouch *touch = (CCTouch*)(*( pTouches->begin() ));
         CCPoint point = touch->getLocationInView();
         CCLog("Touches canceled! %.1f,%.1f", point.x, point.y);
     }
 }

和标准CCTouch基本相同，只是在注册时，调用一次CCLayer的触摸注册函数即可。

运行结果：