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：