Cocos2d-x学习笔记（三）“万物之父”——CCNode

原创文章，转载请注明出处：http://blog.csdn.net/sfh366958228/article/details/38701767

通过前两份学习笔记，我们不难发现CCScene、CCLayer、CCSprite、CCAction等一系列元素都是CCNode的子类，但其实“万物之父”这个标题还是有点夸大，毕竟还有像CCDirector、CCCamera之类并不继承自CCNode的组件。

但是CCNode绝对是Cocos2d-x中举足轻重的一个核心，我们可以把它理解为节点。它是一个不能够可视化显示的抽象类，只是用来定义所有节点的公共属性和方法的。

特征

1）每个节点都可以通过addChild方法包含其他节点作为子节点，也可以通过removeChild来移除子节点。CCNode就像是一棵自由的树。

2）每个子节点都可以通过setTag来设置标记，通过getChildByTag来获取该子节点。

3）每个节点都可以执行计划任务，在Cocos2d-x的系统循环中处理这些任务。

4）每个节点都可以通过runAction执行瞬间动作或延时动作。

5）每个节点添加到场景中，当所在场景为激活场景时，这个节点的绘图方法就会被自动调用完成自我绘制。

属性

class CC_DLL CCNode : public CCObject
{
public:
    CCNode(void);
    virtual ~CCNode(void);

    // 初始化节点
    virtual bool init();

    // 创建一个节点对象
    static CCNode * create(void);

    // 获取一个描述字符串，便于调试
    const char* description(void);

    // 设置/获取Z轴坐标
    virtual void setZOrder(int zOrder);
    virtual int getZOrder();

    /**
     * Sets the z order which stands for the drawing order
     *
     * This is an internal method. Don't call it outside the framework.
     * The difference between setZOrder(int) and _setOrder(int) is:
     * - _setZOrder(int) is a pure setter for m_nZOrder memeber variable
     * - setZOrder(int) firstly changes m_nZOrder, then recorder this node in its parent's chilren array.
     */
    virtual void _setZOrder(int z);

    // 设置/获取OpenGL真实Z轴坐标
    virtual void setVertexZ(float vertexZ);
    virtual float getVertexZ();

    // 设置/获取X轴缩放系数
    virtual void setScaleX(float fScaleX);
    virtual float getScaleX();

    // 设置/获取Y轴缩放系数
    virtual void setScaleY(float fScaleY);
    virtual float getScaleY();

    // 设置/获取缩放系数
    virtual void setScale(float scale);
    virtual float getScale();

    // 设置缩放系数哦
    virtual void setScale(float fScaleX,float fScaleY);

    // 设置/获取节点坐标
    virtual void setPosition(const CCPoint &position);
    virtual const CCPoint& getPosition();

    // 设置节点坐标
    virtual void setPosition(float x, float y);

    // 获取节点坐标至传参
    virtual void getPosition(float* x, float* y);

    // 设置/获取X轴Y轴坐标，这些方法用在与Lua、Javascript绑定
    virtual void  setPositionX(float x);
    virtual float getPositionX(void);
    virtual void  setPositionY(float y);
    virtual float getPositionY(void);

    // 设置/获取X轴扭曲角度
    virtual void setSkewX(float fSkewX);
    virtual float getSkewX();

    // 设置/获取Y轴扭曲角度
    virtual void setSkewY(float fSkewY);
    virtual float getSkewY();

    // 设置/获取锚点
    virtual void setAnchorPoint(const CCPoint& anchorPoint);
    virtual const CCPoint& getAnchorPoint();

    // 获取绝对坐标上的锚点
    virtual const CCPoint& getAnchorPointInPoints();

    // 设置/获取节点大小
    virtual void setContentSize(const CCSize& contentSize);
    virtual const CCSize& getContentSize() const;

    // 设置/获取节点可见性
    virtual void setVisible(bool visible);
    virtual bool isVisible();

    // 设置/获取节点旋转角度
    virtual void setRotation(float fRotation);
    virtual float getRotation();

    // 设置/获取节点X轴旋转角度
    virtual void setRotationX(float fRotaionX);
    virtual float getRotationX();

    // 设置/获取节点Y轴旋转角度
    virtual void setRotationY(float fRotationY);
    virtual float getRotationY();

    /**
     * Sets the arrival order when this node has a same ZOrder with other children.
     *
     * A node which called addChild subsequently will take a larger arrival order,
     * If two children have the same Z order, the child with larger arrival order will be drawn later.
     *
     * @warning This method is used internally for zOrder sorting, don't change this manually
     *
     * @param uOrderOfArrival   The arrival order.
     */
    virtual void setOrderOfArrival(unsigned int uOrderOfArrival);
    virtual unsigned int getOrderOfArrival();

    /**
     * Sets the state of OpenGL server side.
     *
     * @param glServerState     The state of OpenGL server side.
     * @js NA
     */
    virtual void setGLServerState(ccGLServerState glServerState);
    virtual ccGLServerState getGLServerState();

    /**
     * Sets whether the anchor point will be (0,0) when you position this node.
     *
     * This is an internal method, only used by CCLayer and CCScene. Don't call it outside framework.
     * The default value is false, while in CCLayer and CCScene are true
     *
     * @param ignore    true if anchor point will be (0,0) when you position this node
     * @todo This method shoud be renamed as setIgnoreAnchorPointForPosition(bool) or something with "set"
     */
    virtual void ignoreAnchorPointForPosition(bool ignore);
    virtual bool isIgnoreAnchorPointForPosition();

    // 添加子节点
    virtual void addChild(CCNode * child);

    // 添加子节点，同时设置子节点Z轴坐标
    virtual void addChild(CCNode * child, int zOrder);

    // 添加子节点，同时设置子节点Z轴坐标及子节点Tag标签
    virtual void addChild(CCNode* child, int zOrder, int tag);

    // 通过Tag获取子节点
    virtual CCNode * getChildByTag(int tag);

    // 获取当前节点所有子节点
    virtual CCArray* getChildren();

    // 获取当前子节点数量
    virtual unsigned int getChildrenCount(void) const;

    // 设置/获取当前节点父节点
    virtual void setParent(CCNode* parent);
    virtual CCNode* getParent();

    // 将当前节点从父节点中移除
    virtual void removeFromParent();

    /**
     * Removes this node itself from its parent node.
     * If the node orphan, then nothing happens.
     * @param cleanup   true if all actions and callbacks on this node should be removed, false otherwise.
     * @js removeFromParent
     */
    virtual void removeFromParentAndCleanup(bool cleanup);

    // 移除子节点
    virtual void removeChild(CCNode* child);

    // 移除子节点，并设置是否清楚本节点
    virtual void removeChild(CCNode* child, bool cleanup);

    // 通过Tag移除子节点
    virtual void removeChildByTag(int tag);

    // 通过Tag移除子节点，并设置是否清楚本节点
    virtual void removeChildByTag(int tag, bool cleanup);

    // 移除所有子节点
    virtual void removeAllChildren();

    // 移除所有子节点，并设置是否清楚本节点
    virtual void removeAllChildrenWithCleanup(bool cleanup);

    // 重新设置某个子节点的Z轴坐标
    virtual void reorderChild(CCNode * child, int zOrder);

    // 给所有子节点排序
    virtual void sortAllChildren();

    // 获取/设置网格对象
    virtual CCGridBase* getGrid();
    virtual void setGrid(CCGridBase *pGrid);

    // 获取/设置Tag标识
    virtual int getTag() const;
    virtual void setTag(int nTag);

    // 获取/设置用户数据
    virtual void* getUserData();
    virtual void setUserData(void *pUserData);

    // 获取/设置用户数据对象
    virtual CCObject* getUserObject();
    virtual void setUserObject(CCObject *pUserObject);

    /**
     * Return the shader program currently used for this node
     *
     * @return The shader program currelty used for this node
     */
    virtual CCGLProgram* getShaderProgram();
    virtual void setShaderProgram(CCGLProgram *pShaderProgram);

    // 获取摄像机对象
    virtual CCCamera* getCamera();

    // 获取当前节点是否在运行
    virtual bool isRunning();

    // 注册/取消注册脚本Handle
    virtual void registerScriptHandler(int handler);
    virtual void unregisterScriptHandler(void);

    //获取脚本Handle
    inline int getScriptHandler() { return m_nScriptHandler; };

    /**
     * Schedules for lua script.
     * @js NA
     */
    void scheduleUpdateWithPriorityLua(int nHandler, int priority);

    // 当节点进入时调用
    virtual void onEnter();

    // 当节点进入动画结束时调用
    virtual void onEnterTransitionDidFinish();

    // 当节点退出入时调用
    virtual void onExit();

    // 当节点退出动画结束时调用
    virtual void onExitTransitionDidStart();

    // 停止所有运行的动画及调度
    virtual void cleanup(void);

    // 重构这个方法能够绘制自己的节点
    virtual void draw(void);

    // 递归遍历当前节点树
    virtual void visit(void);

    /**
     * Returns a "local" axis aligned bounding box of the node.
     * The returned box is relative only to its parent.
     *
     * @note This method returns a temporaty variable, so it can't returns const CCRect&
     * @todo Rename to getBoundingBox() in the future versions.
     *
     * @return A "local" axis aligned boudning box of the node.
     * @js getBoundingBox
     */
    virtual CCRect boundingBox(void);

    // 设置/获取当前节点的一个ActionManager
    virtual void setActionManager(CCActionManager* actionManager);
    virtual CCActionManager* getActionManager();

    // 执行Action
    CCAction* runAction(CCAction* action);

    // 停止所有Action
    void stopAllActions(void);

    // 停止指定Action
    void stopAction(CCAction* action);

    // 通过Tag停止/获取Action
    void stopActionByTag(int tag);
    CCAction* getActionByTag(int tag);

    /**
     * Returns the numbers of actions that are running plus the ones that are schedule to run (actions in actionsToAdd and actions arrays).
     *
     * Composable actions are counted as 1 action. Example:
     *    If you are running 1 Sequence of 7 actions, it will return 1.
     *    If you are running 7 Sequences of 2 actions, it will return 7.
     * @todo Rename to getNumberOfRunningActions()
     *
     * @return The number of actions that are running plus the ones that are schedule to run
     */
    unsigned int numberOfRunningActions(void);

    // 设置/获取
    virtual void setScheduler(CCScheduler* scheduler);
    virtual CCScheduler* getScheduler();

    /**
     * Checks whether a selector is scheduled.
     *
     * @param selector      A function selector
     * @return Whether the funcion selector is scheduled.
     * @js NA
     * @lua NA
     */
    bool isScheduled(SEL_SCHEDULE selector);

    /**
     * Schedules the "update" method.
     *
     * It will use the order number 0. This method will be called every frame.
     * Scheduled methods with a lower order value will be called before the ones that have a higher order value.
     * Only one "update" method could be scheduled per node.
     * @lua NA
     */
    void scheduleUpdate(void);

    /**
     * Schedules the "update" method with a custom priority.
     *
     * This selector will be called every frame.
     * Scheduled methods with a lower priority will be called before the ones that have a higher value.
     * Only one "update" selector could be scheduled per node (You can't have 2 'update' selectors).
     * @lua NA
     */
    void scheduleUpdateWithPriority(int priority);

    /*
     * Unschedules the "update" method.
     * @see scheduleUpdate();
     */
    void unscheduleUpdate(void);

    /**
     * 执行某个任务
     *
     * @param interval  Tick interval in seconds. 0 means tick every frame. If interval = 0, it's recommended to use scheduleUpdate() instead.
     * @param repeat    The selector will be excuted (repeat + 1) times, you can use kCCRepeatForever for tick infinitely.
     * @param delay     The amount of time that the first tick will wait before execution.
     * @lua NA
     */
    void schedule(SEL_SCHEDULE selector, float interval, unsigned int repeat, float delay);
    void schedule(SEL_SCHEDULE selector, float interval);
    void scheduleOnce(SEL_SCHEDULE selector, float delay);
    void schedule(SEL_SCHEDULE selector);

    // 取消任务
    void unschedule(SEL_SCHEDULE selector);

    // 取消所有任务
    void unscheduleAllSelectors(void);

    // 恢复/暂停节点的动作和任务
    void resumeSchedulerAndActions(void);
    void pauseSchedulerAndActions(void);

    /*
     * Update method will be called automatically every frame if "scheduleUpdate" is called, and the node is "live"
     */
    virtual void update(float delta);

    /**
     * Performs OpenGL view-matrix transformation based on position, scale, rotation and other attributes.
     */
    void transform(void);

    /**
     * Performs OpenGL view-matrix transformation of it's ancestors.
     * Generally the ancestors are already transformed, but in certain cases (eg: attaching a FBO)
     * It's necessary to transform the ancestors again.
     */
    void transformAncestors(void);

    /**
     * Calls children's updateTransform() method recursively.
     *
     * This method is moved from CCSprite, so it's no longer specific to CCSprite.
     * As the result, you apply CCSpriteBatchNode's optimization on your customed CCNode.
     * e.g., batchNode->addChild(myCustomNode), while you can only addChild(sprite) before.
     */
    virtual void updateTransform(void);

    /**
     * Returns the matrix that transform the node's (local) space coordinates into the parent's space coordinates.
     * The matrix is in Pixels.
     */
    virtual CCAffineTransform nodeToParentTransform(void);

    /**
     * Returns the matrix that transform parent's space coordinates to the node's (local) space coordinates.
     * The matrix is in Pixels.
     */
    virtual CCAffineTransform parentToNodeTransform(void);

    /**
     * Returns the world affine transform matrix. The matrix is in Pixels.
     */
    virtual CCAffineTransform nodeToWorldTransform(void);

    /**
     * Returns the inverse world affine transform matrix. The matrix is in Pixels.
     */
    virtual CCAffineTransform worldToNodeTransform(void);

    /**
     * Converts a Point to node (local) space coordinates. The result is in Points.
     */
    CCPoint convertToNodeSpace(const CCPoint& worldPoint);

    /**
     * Converts a Point to world space coordinates. The result is in Points.
     */
    CCPoint convertToWorldSpace(const CCPoint& nodePoint);

    /**
     * Converts a Point to node (local) space coordinates. The result is in Points.
     * treating the returned/received node point as anchor relative.
     */
    CCPoint convertToNodeSpaceAR(const CCPoint& worldPoint);

    /**
     * Converts a local Point to world space coordinates.The result is in Points.
     * treating the returned/received node point as anchor relative.
     */
    CCPoint convertToWorldSpaceAR(const CCPoint& nodePoint);

    /**
     * convenience methods which take a CCTouch instead of CCPoint
     */
    CCPoint convertTouchToNodeSpace(CCTouch * touch);

    /**
     * converts a CCTouch (world coordinates) into a local coordinate. This method is AR (Anchor Relative).
     */
    CCPoint convertTouchToNodeSpaceAR(CCTouch * touch);

    /**
     *  Sets the additional transform.
     */
    void setAdditionalTransform(const CCAffineTransform& additionalTransform);

    // 获取组件
    CCComponent* getComponent(const char *pName) const;

    // 添加组件
    virtual bool addComponent(CCComponent *pComponent);

    // 通过名字移除组件
    virtual bool removeComponent(const char *pName);

    // 通过指针移除组件
    virtual bool removeComponent(CCComponent *pComponent);

    // 移除所有组件
    virtual void removeAllComponents();
}

以上方法为CCNode中的提供，在public块中的方法主要由以下几个部分：

1）针对节点显示的属性信息读写

2）针对节点变化的属性信息读写

3）针对子节点管理的相关方法

4）针对节点数据绑定的相关方法

5）针对节点生命周期的相关方法

6）针对节点处理动作CCAction的相关方法

7）针对节点定时任务的相关方法

8）针对节点坐标变换的相关方法

在CCNode中的节点都有自己的坐标系，成为节点坐标系，当节点坐标系变换后该节点的所有子节点都会随之变换。

节点添加到场景时会参考节点的锚点，锚点默认定义为该节点的中心，在贴图时会以锚点为中心，改变锚点并没有改变节点的位置，只是改变了贴图的位置、

Cocos2d-x的世界坐标系和openGL的坐标系一致，都是一左下角为0,0点，X轴向右，y轴向上。

好了，本节就到这了，下一节将学习CCLayer~

Cocos2d-x学习笔记（三）“万物之父”——CCNode