[置顶] 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 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(0.5f,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();
}