工具函数文字描边，CCSprite 描边。
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CCRenderTexture * UITool::createStroke(CCObject * label, int size, ccColor3B color, int opacity ,int step ){CCTextureProtocol * label_texture = dynamic_cast<CCTextureProtocol*>(label);CCNode * label_node = dynamic_cast<CCNode*>(label);CCRGBAProtocol * label_rgb = dynamic_cast<CCRGBAProtocol*>(label);//CCSize labelSize = label_node->getContentSize();CCSize labelSize = label_texture->getTexture()->getContentSize();CCRenderTexture* rt = CCRenderTexture::create(labelSize.width + size * 2,labelSize.height + size * 2);CCPoint originalPos = label_node->getPosition();ccColor3B originalColor = label_rgb->getColor();GLubyte originalOpacity = label_rgb->getOpacity();bool originalVisibility = label_node->isVisible();label_rgb->setColor(color);label_rgb->setOpacity(opacity);label_node->setVisible(true);ccBlendFunc originalBlend = label_texture->getBlendFunc();ccBlendFunc bf = {GL_SRC_ALPHA, GL_ONE};label_texture->setBlendFunc(bf);CCPoint bottomLeft = ccp(labelSize.width * label_node->getAnchorPoint().x + size, labelSize.height * label_node->getAnchorPoint().y + size);CCPoint positionOffset= ccp(-labelSize.width / 2,-labelSize.height / 2);CCPoint position = ccpSub(originalPos, positionOffset);rt->begin();for (int i=0; i<360; i+= step) // you should optimize that for your needs{label_node->setPosition(ccp(bottomLeft.x + sin(CC_DEGREES_TO_RADIANS(i))*size, bottomLeft.y + cos(CC_DEGREES_TO_RADIANS(i))*size));label_node->visit();}rt->end();label_node->setPosition(originalPos);label_rgb->setColor(originalColor);label_texture->setBlendFunc(originalBlend);label_node->setVisible(originalVisibility);label_rgb->setOpacity(originalOpacity);rt->setPosition(position);return rt;}
