Cocos2d-x开发实例介绍特效演示

下面我们通过一个实例介绍几个特效的使用，这个实例下图所示，下图是一个操作菜单场景，选择菜单可以进入到下图动作场景，在下图动作场景中点击Go按钮可以执行我们选择的特性动作，点击Back按钮可以返回到菜单场景。

下面我们再看看具体的程序代码，首先看一下看HelloWorldScene.h文件，它的代码如下：

[html] view plaincopy

 

1. #ifndef __HELLOWORLD_SCENE_H__  
2. #define __HELLOWORLD_SCENE_H__  
3.    
4. #include "cocos2d.h"  
5. #include "MyActionScene.h"                                                                                                                ①  
6.    
7. typedef enum {                                                                                                                             ②  
8.    kFlipX3D = 101,  
9.    kPageTurn3D,  
10.     kLens3D,  
11.     kShaky3D,  
12.     kWaves3D,  
13.     kJumpTiles3D,  
14.     kShakyTiles3D,  
15.     kWavesTiles3D  
16. } ActionTypes;                                                                                                                             ③  
17.    
18. class HelloWorld : public cocos2d::Layer  
19. {  
20. public:  
21.    static cocos2d::Scene* createScene();  
22.    virtual bool init();   
23.      
24.    void OnClickMenu(cocos2d::Ref* pSender);                                                                    ④  
25.    
26.    CREATE_FUNC(HelloWorld);  
27. };  
28.    
29. #endif // __HELLOWORLD_SCENE_H__  

上述代码第①行是引入头文件MyActionScene.h。第②~③是定义个枚举类型ActionTypes，枚举类型ActionTypes中定义了8个常量，这8个常量对应8个菜单项。第④行声明了一个函数，用来在选择不同菜单时候的回调。

[html] view plaincopy

 

1. 下一个场景MyActionScene的 MyActionScene.h文件的代码如下：  
2. #ifndef __MYACTION_SCENE_H__  
3. #define __MYACTION_SCENE_H__  
4.    
5. #include "cocos2d.h"  
6. #include "HelloWorldScene.h"  
7.    
8. class MyAction : public cocos2d::Layer  
9. {  
10.    cocos2d::Sprite *sprite;                                                                                                        ①  
11.    cocos2d::NodeGrid* gridNodeTarget;                                                                                         ②  
12.      
13. public:  
14.      
15.         staticcocos2d::Scene* createScene();  
16.    virtual bool init();  
17.    
18.    CREATE_FUNC(MyAction);  
19.      
20.    void goMenu(cocos2d::Ref* pSender);  
21.    void backMenu(cocos2d::Ref* pSender);  
22. };  
23.    
24. #endif // __MYACTION_SCENE_H__  

上述代码第①行是声明Sprite类型成员变量sprite。第②行是声明NodeGrid类型成员变量gridNodeTarget，NodeGrid是网格动作管理类，它的类图如下图所示。

MyActionScene.ccp中的MyAction::init()主要代码如下：

[html] view plaincopy

 

1. bool MyAction::init()  
2. {  
3.    if ( !Layer::init() )  
4.    {  
5.        return false;  
6.    }  
7.      
8.    Size visibleSize = Director::getInstance()->getVisibleSize();  
9.         gridNodeTarget= NodeGrid::create();                                                                              ①  
10.    addChild(gridNodeTarget);                                                                                                 ②  
11.      
12.    auto bg = Sprite::create("background.png");  
13.     bg->setPosition(Point(visibleSize.width/2,visibleSize.height /2));  
14.     gridNodeTarget->addChild(bg);                                                                                                     ③  
15.    
16.    sprite = Sprite::create("hero.png");  
17.    sprite->setPosition(Point(visibleSize.width / 2, visibleSize.height /2));  
18.    gridNodeTarget->addChild(sprite);                                                                                             ④  
19.      
20.     autobackMenuItem =MenuItemImage::create("back-up.png","back-down.png",  
21.                                        CC_CALLBACK_1(MyAction::backMenu,this));  
22.     backMenuItem->setPosition(Director::getInstance()->convertToGL(Point(140,65)));  
23.    
24.     autogoMenuItem = MenuItemImage::create("go-up.png","go-down.png",  
25.                                        CC_CALLBACK_1(MyAction::goMenu,this));  
26.     goMenuItem->setPosition(Director::getInstance()->convertToGL(Point(920,540)));  
27.    
28.    Menu* mn = Menu::create(backMenuItem, goMenuItem, NULL);  
29.      
30.     mn->setPosition(Point::ZERO);  
31.    this->addChild(mn);                                                                                                                       ⑤  
32.      
33.    return true;  
34. }  

上述代码第①行代码NodeGrid::create()创建NodeGrid对象，第②行代码需要将创建的NodeGrid对象gridNodeTarget添加到当前层中。第③行代码gridNodeTarget->addChild(bg)是将创建的bg背景精灵对象添加到gridNodeTarget，这样才能使得特效作用于背景精灵。第④行代码gridNodeTarget->addChild(sprite)也是将创建的精灵对象sprite添加到gridNodeTarget中，这样才能使得特效作用于精灵。

由于我们不想使特效作用于菜单，所以在第⑤行代码使用的this->addChild(mn)，而不是gridNodeTarget->addChild(mn)。

MyActionScene.ccp中的MyAction::goMenu(cocos2d::Ref*pSender)主要代码如下：

[html] view plaincopy

 

1. void MyAction::goMenu(cocos2d::Ref*pSender)  
2. {  
3.     SizevisibleSize = Director::getInstance()->getVisibleSize();  
4.    log("Tag = %i",this->getTag());  
5.      
6.    switch (this->getTag()) {  
7.          casekFlipX3D:  
8.            gridNodeTarget->runAction(FlipX3D::create(3.0f));                                                      ①  
9.              break;  
10.          casekPageTurn3D:  
11.             gridNodeTarget->runAction(PageTurn3D::create(3.0f,Size(15,10)));                          ②  
12.              break;  
13.          casekLens3D:  
14.            gridNodeTarget->runAction(Lens3D::create(3.0f, Size(15,10),  
15.                                                 Point(visibleSize.width/2,visibleSize.height/2),240));                       ③  
16.              break;  
17. margin: 0px; padding: 0px; border: none; color: black; backg