简单的碰撞检测实践篇（下）源码

#include "HelloWorldScene.h" #include "cloud.h" #include "Missile.h" #include "Box.h" using namespace cocos2d; //天空的颜色 static const ccColor4B SKY_COLOR = {30, 66, 78, 255}; static HelloWorld* layer; //导弹精灵 static Missile* MissileSprite; //天空背景图层 static cocos2d::CCLayerColor* skyLayer; enum { //设定一个父节点的tag kTagParentNode = 1, }; enum { Z_PHYSICS_DEBUG = 100, }; HelloWorld::HelloWorld(){ } HelloWorld::~HelloWorld() { // manually Free rogue shapes for( int i=0;i<4;i++) { cpShapeFree( m_pWalls[i] ); } cpSpaceFree( m_pSpace ); } //调试模式下可以看到为刚体定义的形状，否则形状会不可见 void HelloWorld::toggleDebugCallback(CCObject* pSender) { #if CC_ENABLE_CHIPMUNK_INTEGRATION m_pDebugLayer->setVisible(! m_pDebugLayer->isVisible()); #endif } CCScene* HelloWorld::scene() { CCScene * scene = NULL; do { // 'scene' is an autorelease object scene = CCScene::create(); CC_BREAK_IF(! scene); // 'layer' is an autorelease object layer = HelloWorld::create(); CC_BREAK_IF(! layer); // add layer as a child to scene scene->addChild(layer,0,1); } while (0); // return the scene return scene; } // on "init" you need to initialize your instance bool HelloWorld::init() { bool bRet = false; do { ////////////////////////////////////////////////////////////////////////// // super init first ////////////////////////////////////////////////////////////////////////// CC_BREAK_IF(! CCLayer::init()); ////////////////////////////////////////////////////////////////////////// // add your codes below... ////////////////////////////////////////////////////////////////////////// // 1. Add a menu item with "X" image, which is clicked to quit the program. // Create a "close" menu item with close icon, it's an auto release object. CCMenuItemImage *pCloseItem = CCMenuItemImage::create( "CloseNormal.png", "CloseSelected.png", this, menu_selector(HelloWorld::menuCloseCallback)); CC_BREAK_IF(! pCloseItem); // Place the menu item bottom-right conner. pCloseItem->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 20)); // Create a menu with the "close" menu item, it's an auto release object. CCMenu* pMenu = CCMenu::create(pCloseItem, NULL); pMenu->setPosition(CCPointZero); CC_BREAK_IF(! pMenu); // Add the menu to HelloWorld layer as a child layer. this->addChild(pMenu, 1); this->setTouchEnabled(true); // Get window size and place the label upper. CCSize size = CCDirector::sharedDirector()->getWinSize(); //建立天空颜色图层 CCLayerColor *skyLayer = CCLayerColor::create(SKY_COLOR); addChild(skyLayer); // 创建地面精灵. CCSprite* pSprite = CCSprite::create("Terrain.png"); pSprite->setScale(0.5f); CC_BREAK_IF(! pSprite); // Place the sprite on the center of the screen pSprite->setPosition(ccp(size.width/2, size.height/2)); // Add the sprite to HelloWorld layer as a child layer. this->addChild(pSprite, 0); //加入箱子的表情纹理 CCTextureCache::sharedTextureCache()->addImage("BoxUpset.png"); CCTextureCache::sharedTextureCache()->addImage("BoxHappy.png"); initPhysics(); //创建并设置自定义的精灵-愤怒的乌云 cloudSprite=cloud::create("Cloud.png"); cloudSprite->setScale(0.5f); addChild(cloudSprite); cloudSprite->setPosition(ccp(240,280)); // menu for debug layer 设定物理引擎运行的模式用的菜单按钮 CCMenuItemFont::setFontSize(24); CCMenuItemFont *item = CCMenuItemFont::create("Toggle debug", this, menu_selector(HelloWorld::toggleDebugCallback)); CCMenu *menu = CCMenu::create(item, NULL); this->addChild(menu); menu->setPosition(ccp(VisibleRect::right().x-100, VisibleRect::top().y-60)); Box* box=Box::create("BoxHappy.png",ccp(110,100),m_pSpace); box->setScale(0.6f); addChild(box); //调用计时器，此类计时器只认update方法，也就是层里定义的那个 scheduleUpdate(); bRet = true; } while (0); return bRet; } void HelloWorld::ccTouchesBegan(CCSet* touches, CCEvent* event) { //Add a new body/atlas sprite at the touched location //根据触屏位置添加刚体精灵 CCSetIterator it; CCTouch* touch; for( it = touches->begin(); it != touches->end(); it++) { touch = (CCTouch*)(*it); if(!touch) break; //根据触屏点创建一个导弹 MissileSprite=Missile::create("Missile.png",cloudSprite->getPosition(),cpv(this->getParent()->convertTouchToNodeSpace(touch).x,this->convertTouchToNodeSpace(touch).y),m_pSpace); MissileSprite->setScale(0.5f); addChild(MissileSprite); //更新乌云眼神的角度 cloudSprite->lookAt=touch->getLocation(); } } //触摸移动时的回调函数，用于引导导弹 void HelloWorld::ccTouchesMoved(CCSet* touches, CCEvent* event){ CCSetIterator it; CCTouch* touch; for( it = touches->begin(); it != touches->end(); it++) { touch = (CCTouch*)(*it); if(!touch) break; } if(MissileSprite){ //开启导弹追踪属性并设置重力矢量点到当前触屏移动到的位置 MissileSprite->isTracking=true; MissileSprite->target=cpv(this->getParent()->convertTouchToNodeSpace(touch).x,this->convertTouchToNodeSpace(touch).y); } //更新乌云眼神的角度 cloudSprite->lookAt=touch->getLocation(); } //触摸结束时的回调 void HelloWorld::ccTouchesEnded(CCSet* touches, CCEvent* event){ //去除导弹的跟踪属性 if(MissileSprite){ MissileSprite->isTracking=false; } } //物理系统初始化 void HelloWorld::initPhysics() { #if CC_ENABLE_CHIPMUNK_INTEGRATION // init chipmunk //cpInitChipmunk(); //创建一个物理空间 m_pSpace = cpSpaceNew(); //设定空间的重力点 m_pSpace->gravity = cpv(0, -100); // // rogue shapes // We have to free them manually //这里创建了四个形状用于创建一个矩形的墙体，其对应的刚体是静态刚体，也就是保持静止不动的刚体 //cpSegmentShapeNew用来建立一个段状形状，其它定义请看源码 // bottom m_pWalls[0] = cpSegmentShapeNew( m_pSpace->staticBody, cpv(VisibleRect::leftBottom().x,VisibleRect::leftBottom().y), cpv(VisibleRect::rightBottom().x, VisibleRect::rightBottom().y), 9.0f); // top m_pWalls[1] = cpSegmentShapeNew( m_pSpace->staticBody, cpv(VisibleRect::leftTop().x, VisibleRect::leftTop().y), cpv(VisibleRect::rightTop().x, VisibleRect::rightTop().y), 0.0f); // left m_pWalls[2] = cpSegmentShapeNew( m_pSpace->staticBody, cpv(VisibleRect::leftBottom().x,VisibleRect::leftBottom().y), cpv(VisibleRect::leftTop().x,VisibleRect::leftTop().y), 0.0f); // right m_pWalls[3] = cpSegmentShapeNew( m_pSpace->staticBody, cpv(VisibleRect::rightBottom().x, VisibleRect::rightBottom().y), cpv(VisibleRect::rightTop().x, VisibleRect::rightTop().y), 0.0f); //为形状设定弹性及摩擦系数并加入到物理空间 for( int i=0;i<4;i++) { m_pWalls[i]->e = 1.0f; m_pWalls[i]->u = 1.0f; //设定碰撞类型标识 m_pWalls[i]->collision_type=i; //添加墙体到物理空间 cpSpaceAddStaticShape(m_pSpace, m_pWalls[i] ); //设定碰撞的回调函数，5是导弹的碰撞类型标识 cpSpaceAddCollisionHandler(m_pSpace,5,i,beginCollision,NULL,NULL,NULL,NULL); } // Physics debug layer m_pDebugLayer = CCPhysicsDebugNode::create(m_pSpace); this->addChild(m_pDebugLayer, Z_PHYSICS_DEBUG); #endif } void HelloWorld::update(float delta) { // Should use a fixed size step based on the animation interval. int steps = 2; flo