使用C++进行Cocos2d-x游戏开发入门过程中的要点解析

CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
//第一个参数是颜色ccc4(r,g,b,a) a取值(0~255),越大越不透明 下面两个参数为宽高,不传默认为屏幕大小
CCLayerColor* pLayer=CCLayerColor::create(ccc4(0,0,0,200),visibleSize.width,visibleSize.height);
//CCLayerColor* pLayer=CCLayerColor::create(ccc4(0,0,0,200));
addChild(pLayer,100);

//创建cliper对象
CCClippingNode* pClip=CCClippingNode::create();
addChild(pClip);
//加入灰色的底板
CCLayerColor* pColor=CCLayerColor::create(ccc4(0,0,0,200));
pClip->addChild(pColor);

//创建drawnode对象
CCDrawNode *m_pAA=CCDrawNode::create();
static ccColor4F green = {0, 1, 0, 1};
static CCPoint rect[4]={ccp(-50,50),ccp(50,50),ccp(50,-50),ccp(-50,-50)};
//用上面的数据保存一个100x100的矩形
m_pAA->drawPolygon(rect, 4, green, 0, green);
//设置到屏幕的中心
m_pAA->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
//设置为pclip的模板
pClip->setStencil(m_pAA);

//是否反向?
pClip->setInverted(true);

//创建cliper
CCClippingNode* pClip=CCClippingNode::create();
pClip->setInverted(true);
addChild(pClip);
//添加底板
CCLayerColor* pColor=CCLayerColor::create(ccc4(0,0,0,200));
pClip->addChild(pColor);

//绘制圆形区域
static ccColor4F green = {0, 1, 0, 1};//顶点颜色,这里我们没有实质上没有绘制,所以看不出颜色
float fRadius=55.0f;//圆的半径
const int nCount=100;//圆形其实可以看做正多边形,我们这里用正100边型来模拟园
const float coef = 2.0f * (float)M_PI/nCount;//计算每两个相邻顶点与中心的夹角
static CCPoint circle[nCount];//顶点数组
for(unsigned int i = 0;i <nCount; i++) {
 float rads = i*coef;//弧度
 circle[i].x = fRadius * cosf(rads);//对应顶点的x
 circle[i].y = fRadius * sinf(rads);//对应顶点的y
}
CCDrawNode *pStencil=CCDrawNode::create();
pStencil->drawPolygon(circle, nCount, green, 0, green);//绘制这个多边形!

//动起来
pStencil->runAction(CCRepeatForever::create(CCSequence::createWithTwoActions(CCScaleBy::create(0.05f, 0.95f),
 CCScaleTo::create(0.125f, 1))));
pStencil->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));

//设这模板
pClip->setStencil(pStencil);

//添加圆和手的图片
CCSprite*pCircle=CCSprite::create("circle.png");
pCircle->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
pCircle->runAction(CCRepeatForever::create(CCSequence::createWithTwoActions(CCScaleBy::create(0.05f, 0.95f),
 CCScaleTo::create(0.125f, 1))));
addChild(pCircle);

CCSprite* pHand=CCSprite::create("hand.png");
pHand->setAnchorPoint(ccp(0.0f,1.0f));
pHand->setPosition(ccp(pCircle->getContentSize().width/2,pCircle->getContentSize().height/2));
pCircle->addChild(pHand);

bool CTeachLayer::init()
{
 if (!CCLayer::init())
 {
 return false;
 }
 setTouchEnabled(true);
 return true;
}

void CTeachLayer::registerWithTouchDispatcher()
{
//使用-128和CCMenu优先级相同,并且吞掉事件true//
CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this, -128, true);
CCLayer::registerWithTouchDispatcher();
}

bool CTeachLayer::ccTouchBegan( CCTouch* pTouch, CCEvent* pEvent )
{
    //得到触摸位置
 CCPoint touchPoint = pTouch->getLocation();
    //声明一个右下角100x50的矩形
 CCRect m_obRect=CCRectMake(
 CCDirector::sharedDirector()->getVisibleSize().width-100,
 CCDirector::sharedDirector()->getVisibleSize().height-50,
 100,
 50);
    //判断点是否在矩形中
 if (m_obRect.containsPoint(touchPoint))
 {
 return false;
 }
 return true;
}

bool CTeachLayer::ccTouchBegan( CCTouch* pTouch, CCEvent* pEvent )
{
 CCPoint touchPoint = pTouch->getLocation();

 if (!CGlobal::s_bTeach)
 {
 return false;
 }
    //假设按钮在(300,200)的位置,那么蓝色矩形如下:
 CCRect m_obRect=CCRectMake(
 250,
 150,
 100,
 100);

 if (m_obRect.containsPoint(touchPoint))
 {
        //得到蓝色矩形的中心点(300,200)
 CCPoint pos=ccp(m_obRect.getMidX(),m_obRect.getMidY());
        //这里要转化为UI坐标系(左上角为0,0点)
 pos=CCDirector::sharedDirector()->convertToUI(pos);
        //设置触摸信息
 pTouch->setTouchInfo(pTouch->getID(),pos.x,pos.y);
 return false;
 }

 return true;
}