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。。。

[cpp]

[cpp] #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 "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;
};
[cpp]
#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 error
    glGetError();
    CCRenderTexture *rt = CCRenderTexture::create(textureSize.width, textureSize.height); 补充：移动开发 , 其他 ,