【cocos2d-x笔记】CCLabelTTF 字体描边

#ifndef __CCSTROKELABEL_H__
#define __CCSTROKELABEL_H__
#include "cocos2d.h"

USING_NS_CC;

class CCStrokeLabel : public cocos2d::CCNode {
public:
CCStrokeLabel();
~CCStrokeLabel();
public:
static CCStrokeLabel * create(const char *string, const char *fontName, float fontSize);
float getStrokeSize();
bool repaint();
static CCStrokeLabel* 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;
};

#endif

#include "CCStrokeLabel.h"

using namespace cocos2d;

CCStrokeLabel::CCStrokeLabel()
{

}

CCStrokeLabel::~CCStrokeLabel()
{

}

CCStrokeLabel* CCStrokeLabel::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*/ )
{
CCStrokeLabel *pRet = new CCStrokeLabel();
if(pRet && pRet->initWithString(string, fontName, fontSize, strokeSize, colStroke, hAlignment, vAlignment))
{
pRet->autorelease();
return pRet;
}
CC_SAFE_DELETE(pRet);

return NULL;
}

CCStrokeLabel * CCStrokeLabel::create( const char *string, const char *fontName, float fontSize )
{
return create(string,fontName,fontSize,3);
}

bool CCStrokeLabel::initWithString( const char *label, const char *fontName, float fontSize, float fStrokeSize, const cocos2d::ccColor3B& colStroke, cocos2d::CCTextAlignment hAlignment, cocos2d::CCVerticalTextAlignment vAlignment )
{
m_fStrokeSize = fStrokeSize;
m_colStroke = colStroke;
m_label = CCLabelTTF::create(label, fontName, fontSize, CCSizeZero,hAlignment,vAlignment);
m_label->retain();
updateStroke();
return true;
}

void CCStrokeLabel::setColor( const cocos2d::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 CCStrokeLabel::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 CCStrokeLabel::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");
}
}