5.触摸touch,单点触摸，多点触摸，触摸优先和触摸事件的吞噬



1 触摸

Coco2dx默认仅仅有CCLayer及其派生类才有触摸的功能。

2 单点触摸

打开触摸开关和触摸方式

setTouchEnabled(true);

setTouchMode(kCCTouchesOneByOne);

Cocos2dx 对触摸分三布来处理。分是是点触。移动。离开。

或是中间被打断。

其功能皆有对应的virtual 函数进行override 的。

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);

获取点击的坐标点

CCPoint pt = pTouch->getLocation();

CCLog(“x=%f y=%f”,pt.x,pt.y);

理解getDelta();

ccTouchBegan

start x = 67.309761 y = 180.989975

ccTouchMoved

delta x = 1.013191, y = 0.000000

ccTouchMoved

delta x = 5.977837, y = 0.000000

ccTouchMoved

delta x = 3.985229, y = 0.000000

ccTouchMoved

delta x = 1.013184, y = 0.000000

ccTouchMoved

delta x = 1.992615, y = 0.000000

ccTouchMoved

...................................

...................................

delta x = 1.013184, y = 0.000000

ccTouchMoved

delta x = 0.979431, y = 0.000000

ccTouchMoved

delta x = 1.992615, y = 0.000000

ccTouchMoved

delta x = 3.005798, y = 0.000000

ccTouchMoved

delta x = 3.005798, y = 0.000000

ccTouchMoved

delta x = 2.972015, y = 0.000000

ccTouchMoved

delta x = 1.013214, y = 0.000000

ccTouchMoved

delta x = 3.005798, y = 0.000000

ccTouchMoved

delta x = 0.979431, y = 0.000000

ccTouchEnded

3 多点触摸

打开触摸开关，系统默觉得单点触摸。

setTouchEnabled(true);

cocos2dx对触摸分三部来处理。各自是点触，移动。离开。或是中间被打断。

其功能皆有对应的virtual函数进行override的。

virtual bool ccTouchesBegan(CCSet *pTouches, CCEvent *pEvent);

virtual void ccTouchesMoved(CCSet *pTouches, CCEvent *pEvent);

virtual void ccTouchesEnded(CCSet *pTouches, CCEvent *pEvent);

virtual void ccTouchesCancelled(CCSet *pTouches, CCEvent *pEvent);

获取点击的坐标点。

4 案例（打飞机）

Touch.h

#ifndef __TOUCH_H__

#define __TOUCH_H__

 

#include "cocos2d.h"

USING_NS_CC;

class Touch :public CCLayerColor

{

public:

    static CCScene * scene();

    CREATE_FUNC(Touch);

    bool init();

    enum MyEnum

    {

        BN747

    };

 

    bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent);

    void ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent);

    void ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent);

    void ccTouchCancelled(CCTouch *pTouch, CCEvent *pEvent);

};

 

#endif

Touch.cpp

#include "Touch.h"

#include "AppMacros.h"

 

CCScene *Touch::scene()

{

    CCScene * scene = CCScene::create();

    Touch * layer = Touch::create();

    scene->addChild(layer);

    return scene;

}

 

bool Touch::init()

{

    CCLayerColor::initWithColor(ccc4(255, 255, 255, 255));

 

    setTouchEnabled(true);

    setTouchMode(kCCTouchesOneByOne);

 

    CCSprite * plane = CCSprite::create("hero1.png");

    plane->setPosition(ccp(100, 100));

    addChild(plane);

    plane->setTag(BN747);

 

    return true;

}

 

bool Touch::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent)

{

    CCSprite * plane = (CCSprite *)getChildByTag(BN747);

    CCPoint pt = pTouch->getLocation();

    if (plane->boundingBox().containsPoint(pt))

    {

        CCLOG("touched");

        return true;

    }

    //决定消息是否往下传递

    return false;

}

 

void Touch::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent)

{

    CCSprite * plane = (CCSprite *)getChildByTag(BN747);

    CCPoint pt = plane->getPosition() + pTouch->getDelta();

    if (pt.x > plane->getContentSize().width / 2

        && pt.x < winSize.width - plane->getContentSize().width / 2

        && pt.y > plane->getContentSize().height / 2

        && pt.y < winSize.height - plane->getContentSize().height / 2)

    {

        plane->setPosition(pt);

    }

    CCLog("ccTouchMoved x = %g y = %g", pt.x, pt.y);

}

 

void Touch::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent)

{

    CCLog("ccTouchEnded");

}

 

void Touch::ccTouchCancelled(CCTouch *pTouch, CCEvent *pEvent)

{

    CCLog("ccTouchCancelled");

}

执行结果：