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

 1 #ifndef MyScene_H_H
 2 #define MyScene_H_H
 3
 4 #include "cocos2d.h"
 5 using namespace cocos2d;
 6
 7 class MyScene : public CCLayer
 8 {
 9 public:
10     static CCScene* createScene();
11     virtual bool init();
12     CREATE_FUNC( MyScene );
13
14     virtual bool ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent);
15     virtual void ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent);
16     virtual void ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent);
17     virtual void ccTouchCancelled(CCTouch *pTouch, CCEvent *pEvent);
18
19     virtual void registerWithTouchDispatcher();
20
21
22 private:
23 };
24
25 #endif

MyScene.cpp

 1 #include "MyScene.h"
 2
 3 CCScene* MyScene::createScene()
 4 {
 5     CCScene *scene = CCScene::create();
 6     MyScene *layer = MyScene::create();
 7     scene->addChild(layer);
 8     return scene;
 9 };
10
11
12 bool MyScene::init()
13 {
14     if( !CCLayer::init() ){
15         return false;
16     }
17
18     CCSize size = CCDirector::sharedDirector()->getWinSize();
19     CCSprite *sprite = CCSprite::create("pal4.png");
20     sprite->setAnchorPoint( ccp(0.5, 0.5) );
21     //sprite->setPosition( ccp(size.width/2, size.height/2) );
22     sprite->setPosition( ccp(size.width/2, size.height/2) );
23     sprite->setScale(0.5f);
24     sprite->setTag(2345);
25     addChild(sprite);
26
27     setTouchEnabled(true);
28
29     return true;
30 }
31
32 bool MyScene::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent)
33 {
34     CCPoint point = pTouch->getLocationInView();
35     point = CCDirector::sharedDirector()->convertToGL(point);
36     CCNode *node = getChildByTag(2345);
37     float x = node->getPositionX();
38     float y = node->getPositionY();
39     float width = node->getContentSize().width*node->getScale();
40     float height = node->getContentSize().height*node->getScale();
41     //CCRect rect = CCRectMake(node->getPositionX()-node->getContentSize().width/2, node->getPositionY()-node->getContentSize().height/2,
42     //                        node->getContentSize().width, node->getContentSize().height);
43     CCRect rect = CCRectMake(x-width/2, y-height/2, width, height);
44
45     //CCLog("Touch start! %.1f,%.1f", point.x, point.y);
46     //CCMessageBox("start","info");
47     //return true;
48
49     if( rect.containsPoint(point) ){
50         CCLog("Touch start! %.1f,%.1f", point.x, point.y);
51         return true;
52     }
53
54     return false;
55 }
56
57 void MyScene::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent)
58 {
59     CCPoint point = pTouch->getLocation();
60     CCLog("Touch moved! %.1f,%.1f", point.x, point.y);
61 }
62
63 void MyScene::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent)
64 {
65     CCPoint point = pTouch->getLocation();
66     CCLog("Touch ended! %.1f, %.1f", point.x, point.y);
67 }
68
69 void MyScene::ccTouchCancelled(CCTouch *pTouch, CCEvent *pEvent)
70 {
71     CCPoint point = pTouch->getLocation();
72     CCLog("Touch canceled! %.1f, %.1f", point.x, point.y);
73 }
74
75 void MyScene::registerWithTouchDispatcher()
76 {
77     CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, true);
78 }

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。

 1 void MyScene::registerWithTouchDispatcher()
 2 {
 3     //CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, true);
 4     CCLayer::registerWithTouchDispatcher();
 5 }
 6
 7
 8 void MyScene::ccTouchesBegan(CCSet *pTouches, CCEvent *pEvent)
 9 {
10     if( pTouches->count() == 1 ){
11         CCTouch *touch = (CCTouch*)(*( pTouches->begin() ));
12
13         CCPoint point = touch->getLocationInView();
14         point = CCDirector::sharedDirector()->convertToGL(point);
15         CCNode *node = getChildByTag(2345);
16         float x = node->getPositionX();
17         float y = node->getPositionY();
18         float width = node->getContentSize().width*node->getScale();
19         float height = node->getContentSize().height*node->getScale();
20         CCRect rect = CCRectMake(x-width/2, y-height/2, width, height);
21
22         //CCLog("Touches start! %.1f,%.1f", point.x, point.y);
23
24         if( rect.containsPoint(point) ){
25             CCLog("Touches start! %.1f,%.1f", point.x, point.y);
26         }
27     }
28
29     //return false;
30 }
31
32 void MyScene::ccTouchesMoved(CCSet *pTouches, CCEvent *pEvent)
33 {
34     if( pTouches->count() == 1 ){
35         CCTouch *touch = (CCTouch*)(*( pTouches->begin() ));
36         CCPoint point = touch->getLocationInView();
37         CCLog("Touches moved! %.1f,%.1f", point.x, point.y);
38     }
39 }
40
41 void MyScene::ccTouchesEnded(CCSet *pTouches, CCEvent *pEvent)
42 {
43     if( pTouches->count() == 1 ){
44         CCTouch *touch = (CCTouch*)(*( pTouches->begin() ));
45         CCPoint point = touch->getLocationInView();
46         CCLog("Touches ended! %.1f,%.1f", point.x, point.y);
47     }
48 }
49
50 void MyScene::ccTouchesCancelled(CCSet *pTouches, CCEvent *pEvent)
51 {
52     if( pTouches->count() == 1 ){
53         CCTouch *touch = (CCTouch*)(*( pTouches->begin() ));
54         CCPoint point = touch->getLocationInView();
55         CCLog("Touches canceled! %.1f,%.1f", point.x, point.y);
56     }
57 }

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：