cocos2d-x 画笔实现

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#include "drawPaint.h"int drawPaint::_penBold = 3;bool drawPaint::_isTouchDraw = false;CCScene * drawPaint::scene(){CCScene * s = CCScene::create();CCLayer * layer = drawPaint::create();s->addChild(layer);return s;}bool drawPaint::init(){bool bRet = false;do {CC_BREAK_IF(!CCLayer::init());//这里不加冒号很容易出错；要注意;//画笔创建；pen = CCSprite::create("pen.png");pen->setVisible(false);pen->setAnchorPoint(ccp(0,0));addChild(pen);//注册触屏事件；CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, 0, false);bRet = true;} while (0);return bRet;}bool drawPaint::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent){if (_isTouchDraw){_point.push_back(pTouch->getLocation());//存入第一个点：pen->setVisible(true);//让画笔显示;pen->setPosition(pTouch->getLocation());//设置画笔位置；}return _isTouchDraw;}void drawPaint::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent){//移动的过程中记录点的坐标，并存放到数组中；_point.push_back(pTouch->getLocation());pen->setPosition(pTouch->getLocation());}void drawPaint::ccTouchEnded(CCTouch * pTouch, CCEvent * pEvent){pen->setVisible(false);//让画笔消失；touchEndPos = ccp(-1, -1);//随便存一个在屏幕外的点作为结束点;_point.push_back(touchEndPos);//把结束点存放到数组里；}//根据存放的点来绘制图片；void drawPaint::draw(){CCLayer::draw();ccDrawColor4B(255, 255, 255, 255);//颜色;glLineWidth(_penBold);//粗细;if (_point.size()!=0){int count = _point.size();//记录点的个数；static bool isFirstPoint = false;//是否是第一个点；for (int i = 0; i < count;++i){//获取点的位置；CCPoint pos = _point[i];if (pos.equals(touchEndPos))//检测结束点是否和数组尾点相等;{isFirstPoint = true;}else{if (isFirstPoint || i == 0){ccDrawPoint(ccp(pos.x,pos.y));//i= 0时，画第一个点;isFirstPoint = false;}else{CCPoint p = _point[i - 1];// i-1个，不能让数组越界;ccDrawLine(ccp(pos.x,pos.y),ccp(p.x,p.y));//根据数组里的点来画线;}}}}}
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