Implementation Code of cocos2d-x text Dynamic Display

Header file:

#include <string>using namespace std;#include "cocos2d.h"using namespace cocos2d;class DynamicText:public CCNode{private:    CC_SYNTHESIZE(CCLabelTTF *, ttf, Ttf);    CC_SYNTHESIZE(string, text, Text);    CC_SYNTHESIZE(int, length, Length);public:    static DynamicText * create(CCPoint leftTop, CCSize dim, const char* text,const char* fontName, float fontSize, float speed);    void update(float dt);public:    };

Source file:

#include "DynamicText.h" DynamicText * DynamicText::create(CCPoint leftTop, CCSize dim, const char* text,const char* fontName, float fontSize, float speed){    DynamicText * pRet = new DynamicText();    pRet->ttf = CCLabelTTF::create("", dim, kCCTextAlignmentLeft,kCCVerticalTextAlignmentTop, fontName, fontSize);    if(pRet)    {        pRet->setPosition(leftTop);        pRet->setText(text);        pRet->setLength(0);        pRet->addChild(pRet->ttf);        pRet->ttf->setAnchorPoint(ccp(0, 1));        pRet->schedule(schedule_selector(DynamicText::update), speed);        pRet->autorelease();        return pRet;    }    CC_SAFE_DELETE(pRet);    return 0;}void DynamicText::update(float dt){    length += 1;    if(length <= text.size()){        //utf-8?        if(text[length-1] < 0){            length += 2;        }        ttf->setString(text.substr(0, length).c_str());    }else{        unscheduleAllSelectors();     }}

Example:

Dynamictext * dt = dynamictext: Create (CCP (-512 + 30,-384 + 130), ccsizemake (1024-60,130), "Unicode does not have any character in the range D800-DFFF, this range is agreed in the basic multilingual plane for the UTF-16 extension identifier secondary plane (two UTF-16 representing one secondary flat character ). "," ", 30, 0.02); node-> addchild (DT );