CCClippingNode详解

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cocos2d-x 基于CCClippingNode实现CCLayer遮罩功能，在滑动时超出剪切区域的实现显示部分的效果，不需要再借助其他sprite来遮挡了

2012年06月16日 ⁄ 综合 ⁄ 共 1849字 ⁄ 字号小中大 ⁄ 评论关闭

ClippingLayer::ClippingLayer(){}ClippingLayer::~ClippingLayer(){}ClippingLayer* ClippingLayer::create(){ClippingLayer* LAYER = new ClippingLayer();if(LAYER&&LAYER->init()){LAYER->autorelease();return LAYER;}delete LAYER;return NULL;}bool ClippingLayer::init(){setTouchEnabled(true);m_Node = CCNode::create();CCClippingNode *clipper = CCClippingNode::create();clipper->setContentSize(CCSize(80,100));addChild(clipper,1);clipper->setPosition(CCPointZero);clipper->addChild(m_Node,1);CCDrawNode *stencil = CCDrawNode::create();CCPoint rectangle[4];rectangle[0] = ccp(0, 0);rectangle[1] = ccp(clipper->getContentSize().width, 0);rectangle[2] = ccp(clipper->getContentSize().width, clipper->getContentSize().height);rectangle[3] = ccp(0, clipper->getContentSize().height);ccColor4F white = {1, 1, 1, 1};stencil->drawPolygon(rectangle, 4, white, 1, white);clipper->setStencil(stencil);m_Node->setPosition(CCPointZero);int countHeight=0;for(int i=0;i!=10;++i){CCLabelTTF * label = CCLabelTTF::create("112122","Arial",14);m_Node->addChild(label,1);label->setPosition(ccp(40,countHeight * 20 + 10));countHeight +=1;m_vLabeld.push_back(label);}setContentSize(CCSize(80,countHeight*10));CCLayerColor *colorLayer = CCLayerColor::create(ccc4(200,0,200,100),80,100);addChild(colorLayer,1);return true;}void ClippingLayer::registerWithTouchDispatcher(){CCDirector::sharedDirector()->getTouchDispatcher()->addTargetedDelegate(this,1,false);} bool ClippingLayer::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent) { m_TouchBegin = pTouch->getLocation(); return true; }void ClippingLayer::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent){CCPoint pos = pTouch->getLocation();float yMub = pos.y - m_TouchBegin.y;float endY = m_Node->getPositionY() + yMub;if(endY < -100){m_Node->setPositionY(-100);return;}if(endY > 100){m_Node->setPositionY(100);return;}m_Node->setPositionY(endY);m_TouchBegin  = pos;}void ClippingLayer::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent){}

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