cocos2d-x字体描边Label

参考了http://blog.sina.com.cn/s/blog_a502f1a30101hvh7.html

头文件

#include "cocos2d.h"

class CCLabelTTFStroke : public cocos2d::CCNode

{

public:

    CCLabelTTFStroke();

    ~CCLabelTTFStroke();

             

public:

    static CCLabelTTFStroke* 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);

             

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();}

             

protected:

    void updateStroke();

             

private:

    float                   m_fStrokeSize;

    cocos2d::ccColor3B      m_colStroke;

    cocos2d::CCSprite*      m_sprite;

    cocos2d::CCLabelTTF*    m_label;

};

　　实现文件

USING_NS_CC;

CCLabelTTFStroke::CCLabelTTFStroke()

:m_colStroke(ccc3(0,0,0))

,m_fStrokeSize(1.0f)

,m_sprite(NULL)

,m_label(NULL)

{}

CCLabelTTFStroke::~CCLabelTTFStroke()

{

    CC_SAFE_RELEASE_NULL(m_label);

}

bool CCLabelTTFStroke::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;

}

CCLabelTTFStroke* CCLabelTTFStroke::create(const char *string, const char *fontName, float fontSize, float fStrokeSize,const cocos2d::ccColor3B& colStroke ,CCTextAlignment hAlignment,CCVerticalTextAlignment vAlignment)

{

    CCLabelTTFStroke *pRet = new CCLabelTTFStroke();

    if(pRet && pRet->initWithString(string, fontName, fontSize, fStrokeSize, colStroke, hAlignment, vAlignment))

    {

        pRet->autorelease();

        return pRet;

    }

    CC_SAFE_DELETE(pRet);

    return NULL;

}

void CCLabelTTFStroke::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);

    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(0.5, 0.5));

       

    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(ccp(0, 0));

    m_sprite->setPosition(ccp(0, 0));

    ((CCSprite *)m_sprite)->setFlipY(true);

    addChild(m_sprite);

}

void CCLabelTTFStroke::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 CCLabelTTFStroke::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");

    }

}