《一个都不能死》 游戏开发 （物理引擎）

《一个都不能死》 游戏开发 （物理引擎）

//创建物理场景auto scene = Scene::createWithPhysics();//设置重力scene->getPhysicsWorld()->setGravity(Vec2(0,-1000));Scene* HelloWorld::createScene(){    // 'scene' is an autorelease object    //auto scene = Scene::create();    auto scene = Scene::createWithPhysics();    //scene->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_ALL);    scene->getPhysicsWorld()->setGravity(Vec2(0,-1000));    // 'layer' is an autorelease object    auto layer = HelloWorld::create();    // add layer as a child to scene    scene->addChild(layer);    // return the scene    return scene;}// on "init" you need to initialize your instancebool HelloWorld::init(){    //////////////////////////////    // 1. super init first    if (!LayerColor::initWithColor(Color4B(255, 255, 255, 255)))    {        return false;    }    Size visibleSize = Director::getInstance()->getVisibleSize();    //gcs.pushBack(GameController::create(this, 30));    gcs.insert(0, GameController::create(this, 30));    //gcs.insert(0, GameController::create(this, 250));    scheduleUpdate();    //创建碰撞检测监听    auto listener = EventListenerPhysicsContact::create();    listener->onContactBegin = [this](PhysicsContact &contact){        this->unscheduleUpdate();        Director::getInstance()->replaceScene(GameOver::createScene());        return true;    };    Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener, this);    //添加点击监听    auto touchListener = EventListenerTouchOneByOne::create();    touchListener->onTouchBegan = [this](Touch * t, Event *e){        for (auto it = gcs.begin(); it != gcs.end(); it++){            if ((*it)->hitTestPoint(t->getLocation())){                (*it)->onUserTouch();                break;            }        }        return false;    };    Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(touchListener, this);    return true;}void HelloWorld::update(float dt){    for (auto it = gcs.begin(); it != gcs.end(); it++)    {        (*it)->onUpdate(dt);    }}

创建一个物理世界边缘(一般是窗口大小)，

class Edge:public Node{public:    virtual bool init();    CREATE_FUNC(Edge);};bool Edge::init(){    Node::init();    Size visibleSize = Director::getInstance()->getVisibleSize();    //创建一个物理世界边缘    setPhysicsBody(PhysicsBody::createEdgeBox(visibleSize));    setContentSize(visibleSize);    return true;}

创建人物（刚体）

class Hero :public Sprite{public:    virtual bool init();    CREATE_FUNC(Hero);};bool Hero::init(){    Sprite::init();    Size s = Size(44, 52);    runAction(RepeatForever::create(FlashTool::readJsonSpriteSheet("Hero.json", 0.2f)));    setPhysicsBody(PhysicsBody::createBox(s));    setContentSize(s);    //被撞击后不旋转    getPhysicsBody()->setRotationEnable(false);    //开启碰撞检测    getPhysicsBody()->setContactTestBitmask(1);    //getPhysicsBody()->setCategoryBitmask(1);    //getPhysicsBody()->setCollisionBitmask(1);    return true;}

创建阻挡物

class Block :public Sprite{public:    virtual bool init();    //实现向左移动  超出后删除    virtual void update(float dt);    CREATE_FUNC(Block);};bool Block::init(){    Sprite::init();    Size s = Size((rand() % 20) + 5, (rand()%30) + 10);    Size visibleSize = Director::getInstance()->getVisibleSize();    setPhysicsBody(PhysicsBody::createBox(s));    setTextureRect(Rect(0, 0, s.width, s.height));    setColor(Color3B(0,0,0));    setContentSize(s);    setPositionX(visibleSize.width);    scheduleUpdate();    //设置静态，不会因为人物卡住 持续运动    getPhysicsBody()->setDynamic(false);    //设置碰撞检测    getPhysicsBody()->setContactTestBitmask(1);    return true;}void Block::update(float dt){    this->setPositionX(getPositionX() - 3);    if (getPositionX() < 0){            unscheduleUpdate();        removeFromParent();    }}

//创建控制器

class GameController :public Ref{private:    Layer *_layer;    float _positionY;    Size visibleSize;    int currentFrameIndex;    int nextFrameCount;    Edge *edge;    Hero *hero;private:    void resetFrames();    void addBlock();public:    virtual bool init(Layer *layer,float positionY);    //每过一段时间添加一个障碍物    void onUpdate(float dt);    //是否包含点  用于判断用户点击的位置是否在edgebody中     bool hitTestPoint(Vec2 point);    //用户点击后给英雄一个向上的冲力。    void onUserTouch();    static GameController * create(Layer *layer, float position);};GameController * GameController::create(Layer *layer, float position){    auto _ins = new GameController();    _ins->init(layer, position);    _ins->autorelease();    return _ins;}bool GameController::init(Layer *layer, float positionY){    _layer = layer;    _positionY = positionY;    visibleSize = Director::getInstance()->getVisibleSize();    //add edge    edge = Edge::create();    edge->setPosition(visibleSize.width / 2, visibleSize.height / 2 + positionY);    edge->setContentSize(visibleSize);    layer->addChild(edge);    //add ground    auto ground = Sprite::create();    ground->setColor(Color3B(0, 0, 0));    ground->setTextureRect(Rect(0, 0, visibleSize.width, 3));    ground->setPosition(visibleSize.width/2, 1.5 + positionY);    layer->addChild(ground);    //add hero    hero = Hero::create();    hero->setPosition(50, hero->getContentSize().height/2 + positionY);    layer->addChild(hero);    resetFrames();    return true;}void GameController::resetFrames(){    currentFrameIndex = 0;    nextFrameCount = (rand() % 120) + 100;}void GameController::addBlock(){    auto b = Block::create();    _layer->addChild(b);    b->setPositionY(b->getContentSize().height / 2 + _positionY);}void GameController::onUpdate(float dt){    currentFrameIndex++;    if (currentFrameIndex >= nextFrameCount){        resetFrames();        addBlock();    }}bool GameController::hitTestPoint(Vec2 point){    return edge->getBoundingBox().containsPoint(point);}void GameController::onUserTouch(){    hero->getPhysicsBody()->setVelocity(Vec2(0, 400));}