cocos2d实现CCLabelTTF真正字体描边效果

在开发游戏中，我们需要在需要在游戏中显示一个字体轮廓比较清晰的效果，我们就需要给字体的周围进行描边，让字体显示比较更加突出，我重写了cclabelttf类，使它具有描边的特效，和描边的大小以及颜色。。。

开发人员:Jason's.Alex   QQ:531401335

csdn博客:http://blog.csdn.net/RuShrooM

#include "cocos2d.h"using namespace cocos2d;class StrokeLabelTTF : public cocos2d::CCNode{public:StrokeLabelTTF();~StrokeLabelTTF();public:static StrokeLabelTTF* create(const char *string, const char *fontName, float fontSize, float strokeSize,const cocos2d::ccColor3B&      colStroke = cocos2d::ccc3(0, 0, 0), cocos2d::CCTextAlignment hAlignment=cocos2d::kCCTextAlignmentCenter, cocos2d::CCVerticalTextAlignment vAlignment=cocos2d::kCCVerticalTextAlignmentTop);bool initWithString(const char *label, const char *fontName, float fontSize, float fStrokeSize, const cocos2d::ccColor3B&      colStroke, cocos2d::CCTextAlignment hAlignment, cocos2d::CCVerticalTextAlignment vAlignment);        static StrokeLabelTTF * create(const char *string, const char *fontName, float fontSize);public:void setColor(const cocos2d::ccColor3B& color3);void setString(const char *label);void setStrokeColor(cocos2d::ccColor3B col){ m_colStroke = col; updateStroke(); }void setStrokeSize(float StrokeSize){ m_fStrokeSize = StrokeSize; updateStroke();}    void setAnchorPoint(const cocos2d::CCPoint &anchorPoint);protected:void updateStroke();private:float                   m_fStrokeSize;cocos2d::ccColor3B      m_colStroke;cocos2d::CCSprite*      m_sprite;cocos2d::CCLabelTTF*    m_label;    CCPoint anchorPoint;};

#include "StrokeLabelTTF.h"USING_NS_CC;StrokeLabelTTF::StrokeLabelTTF():m_colStroke(ccc3(0,0,0)),m_fStrokeSize(1.0f),m_sprite(NULL),m_label(NULL)    ,anchorPoint(0.5,0.5){}StrokeLabelTTF::~StrokeLabelTTF(){CC_SAFE_RELEASE_NULL(m_label);}bool StrokeLabelTTF::initWithString(const char *string, const char *fontName, float fontSize, float strokeSize,const cocos2d::ccColor3B& colStroke, CCTextAlignment hAlignment,CCVerticalTextAlignment vAlignment){m_fStrokeSize = strokeSize;m_colStroke = colStroke;m_label = CCLabelTTF::create(string, fontName, fontSize, CCSizeZero,hAlignment,vAlignment);m_label->retain();updateStroke();return true;}StrokeLabelTTF* StrokeLabelTTF::create(const char *string, const char *fontName, float fontSize, float fStrokeSize,const cocos2d::ccColor3B& colStroke ,CCTextAlignment hAlignment,CCVerticalTextAlignment vAlignment){StrokeLabelTTF *pRet = new StrokeLabelTTF();if(pRet && pRet->initWithString(string, fontName, fontSize, fStrokeSize, colStroke, hAlignment, vAlignment)){pRet->autorelease();return pRet;}CC_SAFE_DELETE(pRet);return NULL;}StrokeLabelTTF * StrokeLabelTTF::create(const char *string, const char *fontName, float fontSize){    StrokeLabelTTF *pRet = new StrokeLabelTTF();        if(pRet && pRet->initWithString(string,fontName,fontSize,1.5,ccc3(0,0,0),kCCTextAlignmentCenter,kCCVerticalTextAlignmentTop))    {        pRet->autorelease();        return pRet;    }        CC_SAFE_DELETE(pRet);    return NULL;    }void StrokeLabelTTF::updateStroke(){if (m_sprite){removeChild(m_sprite, true);}CCSize textureSize = m_label->getContentSize();textureSize.width += 2 * m_fStrokeSize;textureSize.height += 2 * m_fStrokeSize;//call to clear errorglGetError();CCRenderTexture *rt = CCRenderTexture::create(textureSize.width, textureSize.height);if(!rt){CCLOG("create render texture failed !!!!");addChild(m_label);return;}ccColor3B col = m_label->getColor();m_label->setColor(m_colStroke);ccBlendFunc originalBlend = m_label->getBlendFunc();ccBlendFunc func = { GL_SRC_ALPHA, GL_ONE};m_label->setBlendFunc(func);m_label->setAnchorPoint(ccp(0.5f,0.5f));rt->begin();for(int i = 0; i < 360; i += 15){float r = CC_DEGREES_TO_RADIANS(i);m_label->setPosition(ccp(textureSize.width * 0.5f + sin(r) * m_fStrokeSize,textureSize.height * 0.5f + cos(r) * m_fStrokeSize));m_label->visit();}m_label->setColor(col);m_label->setBlendFunc(originalBlend);m_label->setPosition(ccp(textureSize.width * 0.5f, textureSize.height * 0.5f));m_label->visit();rt->end();CCTexture2D *texture = rt->getSprite()->getTexture();texture->setAliasTexParameters();m_sprite = CCSprite::createWithTexture(rt->getSprite()->getTexture());setContentSize(m_sprite->getContentSize());m_sprite->setAnchorPoint(this->anchorPoint);//------------m_sprite->setPosition(ccp(0, 0));((CCSprite *)m_sprite)->setFlipY(true);addChild(m_sprite);}void StrokeLabelTTF::setString(const char *label){if (m_label){if(0!=strcmp(label, m_label->getString())){m_label->setString(label);updateStroke();}}else{CCLOG("ERROR:CCLabelTTFStroke::setString m_label=NULL");}}void StrokeLabelTTF::setColor(const ccColor3B& color3){if (m_label){ccColor3B col = m_label->getColor();if(color3.r!=col.r || color3.g!=col.g || color3.b!=col.b){m_label->setColor(color3);updateStroke();}}else{CCLOG("ERROR:CCLabelTTFStroke::setColor m_label=NULL");}}void StrokeLabelTTF::setAnchorPoint(const cocos2d::CCPoint &anchorPoint1){    this->anchorPoint=anchorPoint1;    updateStroke();}