【Cocos2D-X 学习笔记】为精灵添加单点触控

#include "cocos2d.h"

USING_NS_CC;     //using namespace cocos2d

class Ball: public CCSprite,public CCTargetedTouchDelegate{


public:
    virtual void onEnter(); 
    //新创建一个Ball对象并显示时就会调用onEnter方法，在onEnter中把该对象添加进CCTouchDispatcher（触摸事件管理器）中

    virtual void onExit();
    //该对象终结时会调用onExit方法，在该方法中，把该对象从CCTouchDispatcher中删除

    static Ball* create(char *imageName);
    //重写了父类的create()方法，使得可以喝CCSprite一样通过create方法创建一个Ball精灵

public:
    virtual bool isPointInside(CCPoint point);
    //判断当前触摸到的点是否刚好在精灵上

    //触摸事件必须要实现的三个接口
public:
    virtual bool ccTouchBegan(CCTouch *touch,CCEvent *pevent);
    virtual void ccTouchMoved(CCTouch *touch,CCEvent *pevent);
    virtual void ccTouchEnded(CCTouch *touch,CCEvent *pevent);

};

#include "cocos2d.h"
#include "ball.h"

USING_NS_CC;


//在类声明里面出现的静态成员必须在定义的时候进行外部引用声明！！

void Ball::onEnter(){
    CCDirector *director=CCDirector::sharedDirector();
    director->getTouchDispatcher()->addTargetedDelegate(this,0,true);         //将该对象添加进事件处理序列
    CCSprite::onEnter();     //调用其父类的构造方法保证精灵能够正常初始化
    CCLog("On Enter!");
    
}

void Ball::onExit(){
    CCDirector *director=CCDirector::sharedDirector(); 
    director->getTouchDispatcher()->removeDelegate(this);                      //将该对象从事件处理序列中移除
    CCSprite::onExit();
    CCLog("On Exit!");
}

Ball* Ball::create(char *imageName){
    Ball *ball=new Ball();              //采用new方法创建一个对象，并设置自动释放
    ball->autorelease();
    ball->initWithTexture(CCTextureCache::sharedTextureCache()->addImage(imageName));  
                                          //CCTextureCache是一个单例模式，同CCDirector类似，addImage()方法回返回一个Texture2D对象供精灵初始化使用
                                          //addIamge方法回返回一个设定图像的Texture2D对象
    return ball;
}

bool Ball::ccTouchBegan(CCTouch *touch,CCEvent *pEvent){
    CCPoint point=touch->getLocation();
    if(!isPointInside(point))
        return false;            //ccTouchBegan返回false时表示不再执行ccTouchMoved 和ccTouchEnded函数，否则返回true时会执行上述两个方法
    return true;
     
    
}

void Ball::ccTouchMoved(CCTouch *touch,CCEvent *pEvent){
    CCPoint point=touch->getLocation();
    this->setPosition(point);
}



void Ball::ccTouchEnded(CCTouch *touch,CCEvent *pEvent){
    

}

//因为使用了new 方法，所以必须把所有的虚函数都实现，这是C++自身的语法
bool Ball::isPointInside(CCPoint point){
    CCPoint nodePoint=this->convertToNodeSpace(point);
    CCSize size=this->getContentSize();
    if(nodePoint.x>size.width ||nodePoint.x<0 ||nodePoint.y>size.height ||nodePoint.y<0 )
        return false;
    else
        return true;
}

#include "HelloWorldScene.h"
#include "ball.h"

using namespace cocos2d;

CCScene* HelloWorld::scene()
{
    CCScene * scene = NULL;
    do 
    {
        // ‘scene‘ is an autorelease object
        scene = CCScene::create();
        CC_BREAK_IF(! scene);

        // ‘layer‘ is an autorelease object
        HelloWorld *layer = HelloWorld::create();
        CC_BREAK_IF(! layer);

        // add layer as a child to scene
        scene->addChild(layer);
    } while (0);

    // return the scene
    return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    bool bRet = false;
    do 
    {
        //////////////////////////////////////////////////////////////////////////
        // super init first
        //////////////////////////////////////////////////////////////////////////

        CC_BREAK_IF(! CCLayer::init());

        //////////////////////////////////////////////////////////////////////////
        // add your codes below...
        //////////////////////////////////////////////////////////////////////////

        // 1. Add a menu item with "X" image, which is clicked to quit the program.

        // Create a "close" menu item with close icon, it‘s an auto release object.
        CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
            "CloseNormal.png",
            "CloseSelected.png",
            this,
            menu_selector(HelloWorld::menuCloseCallback));
        CC_BREAK_IF(! pCloseItem);

        // Place the menu item bottom-right conner.
        pCloseItem->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 20));

        // Create a menu with the "close" menu item, it‘s an auto release object.
        CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
        pMenu->setPosition(CCPointZero);
        CC_BREAK_IF(! pMenu);

        // Add the menu to HelloWorld layer as a child layer.
        this->addChild(pMenu, 1);

        Ball *ball=Ball::create("ball.png");
        ball->setPosition(ccp(100,100));
        this->addChild(ball);


        bRet = true;
    } while (0);

    return bRet;
}

void HelloWorld::menuCloseCallback(CCObject* pSender)
{
    // "close" menu item clicked
    CCDirector::sharedDirector()->end();
}