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：

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#ifndef __HELLOWORLD_SCENE_H__  
#define __HELLOWORLD_SCENE_H__  
   
#include "cocos2d.h"  
#include "MyActionScene.h"                                                                                                                ①  
   
typedef enum {                                                                                                                             ②  
   kFlipX3D = 101,  
   kPageTurn3D,  
    kLens3D,  
    kShaky3D,  
    kWaves3D,  
    kJumpTiles3D,  
    kShakyTiles3D,  
    kWavesTiles3D  
} ActionTypes;                                                                                                                             ③  
   
class HelloWorld : public cocos2d::Layer  
{  
public:  
   static cocos2d::Scene* createScene();  
   virtual bool init();   
     
   void OnClickMenu(cocos2d::Ref* pSender);                                                                    ④  
   
   CREATE_FUNC(HelloWorld);  
};  
   
#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。

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下一个场景MyActionScene的 MyActionScene.h文件的代码如下：  
#ifndef __MYACTION_SCENE_H__  
#define __MYACTION_SCENE_H__  
   
#include "cocos2d.h"  
#include "HelloWorldScene.h"  
   
class MyAction : public cocos2d::Layer  
{  
   cocos2d::Sprite *sprite;                                                                                                        ①  
   cocos2d::NodeGrid* gridNodeTarget;                                                                                         ②  
     
public:  
     
        staticcocos2d::Scene* createScene();  
   virtual bool init();  
   
   CREATE_FUNC(MyAction);  
     
   void goMenu(cocos2d::Ref* pSender);  
   void backMenu(cocos2d::Ref* pSender);  
};  
   
#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。

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

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bool MyAction::init()  
{  
   if ( !Layer::init() )  
   {  
       return false;  
   }  
     
   Size visibleSize = Director::getInstance()->getVisibleSize();  
        gridNodeTarget= NodeGrid::create();                                                                              ①  
   addChild(gridNodeTarget);                                                                                                 ②  
     
   auto bg = Sprite::create("background.png");  
    bg->setPosition(Point(visibleSize.width/2,visibleSize.height /2));  
    gridNodeTarget->addChild(bg);                                                                                                     ③  
   
   sprite = Sprite::create("hero.png");  
   sprite->setPosition(Point(visibleSize.width / 2, visibleSize.height /2));  
   gridNodeTarget->addChild(sprite);                                                                                             ④  
     
    autobackMenuItem =MenuItemImage::create("back-up.png","back-down.png",  
                                       CC_CALLBACK_1(MyAction::backMenu,this));  
    backMenuItem->setPosition(Director::getInstance()->convertToGL(Point(140,65)));  
   
    autogoMenuItem = MenuItemImage::create("go-up.png","go-down.png",  
                                       CC_CALLBACK_1(MyAction::goMenu,this));  
    goMenuItem->setPosition(Director::getInstance()->convertToGL(Point(920,540)));  
   
   Menu* mn = Menu::create(backMenuItem, goMenuItem, NULL);  
     
    mn->setPosition(Point::ZERO);  
   this->addChild(mn);                                                                                                                       ⑤  
     
   return true;  
}  

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：

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void MyAction::goMenu(cocos2d::Ref*pSender)  
{  
    SizevisibleSize = Director::getInstance()->getVisibleSize();  
   log("Tag = %i",this->getTag());  
     
   switch (this->getTag()) {  
         casekFlipX3D:  
           gridNodeTarget->runAction(FlipX3D::create(3.0f));                                                      ①  
             break;  
         casekPageTurn3D:  
            gridNodeTarget->runAction(PageTurn3D::create(3.0f,Size(15,10)));                          ②  
             break;  
         casekLens3D:  
           gridNodeTarget->runAction(Lens3D::create(3.0f, Size(15,10),  
                                                Point(visibleSize.width/2,visibleSize.height/2),240));                       ③  
             break;  
         casekShaky3D:  
           gridNodeTarget->runAction(Shaky3D::create(3.0f, Size(15,10), 5,false));                  ④  
             break;  
         casekWaves3D:  
           gridNodeTarget->runAction(Waves3D::create(3.0f, Size(15,10), 5, 40));            ⑤  
             break;  
         casekJumpTiles3D:  
           gridNodeTarget->runAction(JumpTiles3D::create(3.0f, Size(15,10), 2,30));              ⑥  
             break;  
         casekShakyTiles3D:  
           gridNodeTarget->runAction(ShakyTiles3D::create(3.0f, Size(16,12), 5,false));         ⑦  
             break;  
         casekWavesTiles3D:  
           gridNodeTarget->runAction(CCWavesTiles3D::create(3.0f,Size(15,10), 4, 120));     ⑧  
             break;  
    }  
}  