cocos2d-x2.2--公告栏的实现文字左右移动

公告栏用的是CClayer(层)或者node节点，锚点位置是（0,0）， 文字信息使用CCLabelTTF保存，锚点位置是（0,0），使用的时候将它加入到node里面就好了

文字移动的思路是：

每次都update公告的CCLabelTTF的坐标，为了让它 从右往左进行移动，右边栏出来，左边栏消失，需要设置一下CCLabelTTF的可 显示区域，CCLabelTTF::setTextureRect函数正是设置Label的可显示区域，因此左右边界需要特殊处理，解决方法：

HelloWorldScene.h

[cpp] view plain copy

1. #ifndef__HELLOWORLD_SCENE_H__
2. #define__HELLOWORLD_SCENE_H__
4. #include"cocos2d.h"
5. #include<renren-ext.h>
6. USING_NS_CC;
7. classHelloWorld:publiccocos2d::CCLayer
8. {
9. public:
10. //Here'sadifference.Method'init'incocos2d-xreturnsbool,insteadofreturning'id'incocos2d-iphone
11. virtualboolinit();
12. //there'sno'id'incpp,sowerecommendreturningtheclassinstancepointer
13. staticcocos2d::CCScene*scene();
15. //aselectorcallback
16. voidmenuCloseCallback(CCObject*pSender);
17. CREATE_FUNC(HelloWorld);
18. //implementthe"staticnode()"methodmanually
19. virtualvoidupdate(floatdelta);
20. CCLabelTTF*adLabel;
21. CCLayerColor*adCClayer;
22. CCRectm_informRect;
23. floatm_informScrollX;
24. };
25. #endif//__HELLOWORLD_SCENE_H__

HelloWorldScene.cpp

boolHelloWorld::init()
1. {
2. //////////////////////////////
3. //1.superinitfirst
4. if(!CCLayer::init())
5. returnfalse;
6. }
7. CCSizevisibleSize=CCDirector::sharedDirector()->getVisibleSize();
8. CCPointorigin=CCDirector::sharedDirector()->getVisibleOrigin();
9. adCClayer=CCLayerColor::create(ccc4(255,100),300,30);
10. adCClayer->setPosition(ccp(visibleSize.width/10,visibleSize.height/2+origin.y));
11. adCClayer->setAnchorPoint(ccp(0,0));
12. this->addChild(adCClayer);
13. CCSizesize=adCClayer->getContentSize();
14. adLabel=CCLabelTTF::create("helloworld","Arial",24);
15. adLabel->setAnchorPoint(ccp(0,108); list-style:decimal-leading-zero outside; color:inherit; line-height:18px; margin:0px!important; padding:0px 3px 0px 10px!important"> adLabel->setPosition(CCSize(size.width,0));
16. m_informScrollX=size.width;
17. m_informRect=adLabel->getTextureRect();
18. this->scheduleUpdate();
19. adCClayer->addChild(adLabel);
20. true;
21. }