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/2, size.height/2) );
    sprite->setScale(0.5f);
    sprite->setTag(2345);
    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(2345);
    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/2, y-height/2, 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, 0, 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() == 1 ){
        CCTouch *touch = (CCTouch*)(*( pTouches->begin() ));

        CCPoint point = touch->getLocationInView();
        point = CCDirector::sharedDirector()->convertToGL(point);
        CCNode *node = getChildByTag(2345);
        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/2, y-height/2, 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() == 1 ){
        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() == 1 ){
        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() == 1 ){
        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：