cocos2d-x文本动态显示实现代码

头文件:
#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:
    
};


源文件:

#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(); 
    }
}

使用示例:

DynamicText * dt = DynamicText::create(ccp(-512+30,-384+130), CCSizeMake(1024-60, 130), "Unicode在范围D800-DFFF中不存在任何字符,基本多文种平面中约定了这个范围用于UTF-16扩展标识辅助平面(两个UTF-16表示一个辅助平面字符)。","楷体",30, 0.02);
node->addChild(dt);


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