cocos2dx简单实现描边

来源：互联网发布：混血知乎编辑：程序博客网时间：2024/05/16 12:49

版本2.x

首先写一个类继承CCLabelTTF

#pragma once#include "cocos2d.h"namespace Game{using namespace cocos2d;class LabelTTFStroke:public cocos2d::CCLabelTTF{public:LabelTTFStroke(void);~LabelTTFStroke(void);static LabelTTFStroke * create(const char *string, const char *fontName, float fontSize, float strokeSize=0, const cocos2d::ccColor3B & strokeColor=ccc3(0,0,0), cocos2d::CCTextAlignment hAlignment=kCCTextAlignmentCenter, cocos2d::CCVerticalTextAlignment vAlignment=kCCVerticalTextAlignmentTop);void visit(); private:cocos2d::ccColor3B m_strokeColor;float m_strokeSize;};}

#include "LabelTTFStroke.h"namespace Game{using namespace cocos2d;LabelTTFStroke::LabelTTFStroke(void):m_strokeColor(ccc3(0,0,0)),m_strokeSize(0.0f){}LabelTTFStroke::~LabelTTFStroke(void){}void LabelTTFStroke::visit(){if(!isVisible())return;if(m_strokeSize>0){ccColor3B col = getColor(); CCPoint pos = getPosition(); setColor(m_strokeColor);        setPosition(ccp(pos.x + 1 * m_strokeSize, pos.y + 1 * m_strokeSize));        CCLabelTTF::visit();        setPosition(ccp(pos.x - 1 * m_strokeSize, pos.y -1 *m_strokeSize));        CCLabelTTF::visit();setPosition(ccp(pos.x + 1 * m_strokeSize, pos.y - 1 * m_strokeSize));        CCLabelTTF::visit();        setPosition(ccp(pos.x - 1 * m_strokeSize, pos.y + 1 * m_strokeSize));        CCLabelTTF::visit();setColor(col);        setPosition(ccp(pos.x, pos.y));}CCLabelTTF::visit();}LabelTTFStroke * LabelTTFStroke::create(const char *string, const char *fontName, float fontSize, float strokeSize, const cocos2d::ccColor3B & strokeColor, CCTextAlignment hAlignment, CCVerticalTextAlignment vAlignment){LabelTTFStroke *pRet = new LabelTTFStroke();if(pRet && pRet->initWithString(string, fontName, fontSize, CCSizeZero, hAlignment, vAlignment))    {pRet->m_strokeColor = strokeColor;pRet->m_strokeSize = strokeSize;        pRet->autorelease();        return pRet;    }    CC_SAFE_DELETE(pRet);    return NULL;}}

重写visit()函数，不同的方向，根据描边的宽度，重新画4遍，这样一个描边就相当于画了5遍，描边4遍，自己一遍

visit 也可以这样写

void LabelTTFStroke::visit(){if(!isVisible())return;if(m_strokeSize>0){ccColor3B col = getColor(); CCPoint pos = getPosition(); setColor(m_strokeColor);        setPosition(ccp(pos.x + 1 * m_strokeSize, pos.y));        CCLabelTTF::visit();        setPosition(ccp(pos.x - 1 * m_strokeSize, pos.y));        CCLabelTTF::visit();setPosition(ccp(pos.x, pos.y - 1 * m_strokeSize));        CCLabelTTF::visit();        setPosition(ccp(pos.x, pos.y + 1 * m_strokeSize));        CCLabelTTF::visit();setColor(col);        setPosition(ccp(pos.x, pos.y));}CCLabelTTF::visit();}

使用方法：

Game::LabelTTFStroke* pLabel1 = Game::LabelTTFStroke::create("Hello World", "Arial", 30, 2.0, ccc3(255,0,0));        // position the label on the center of the screen    pLabel1->setPosition(ccp(origin.x + visibleSize.width/2,                            origin.y + visibleSize.height - pLabel->getContentSize().height-50));    // add the label as a child to this layer    this->addChild(pLabel1, 1);

缺点：描边尺寸不能设置太大，否则会有问题。

0 0