cocos2dx 精灵的移动（2）

目标：想要精灵进行随机的移动。

过程：需要一个白色的背景，所以先来修改 HelloWorld 的继承，改成继承 CCLayerColor，然后修改一下 init 方法。如下：

CCLayerColor::initWithColor(ccc4(255, 255, 255, 255)) 

添加完图片资源之后就可以开始敲代码了，需要注释的地方都写在代码里了，，就直接贴代码：

HelloWorld.h 声明的方法：

void addTarget();
void spriteMoveFinished(CCNode *sender);
void gameLogic(cocos2d::CCTime dt);

HelloWorld.m文件重写 init( ) 方法：

#include "HelloWorldScene.h"
#include "SimpleAudioEngine.h"

using namespace cocos2d;
using namespace CocosDenshion;

CCScene* HelloWorld::scene()
{
    // 'scene' is an autorelease object
    CCScene *scene = CCScene::create();
    
    // 'layer' is an autorelease object
    HelloWorld *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 instance
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( CCLayerColor::initWithColor(ccc4(255, 255, 255, 255)) )
    {
        
        CCSize winSize = CCDirector::sharedDirector()->getWinSize();//获取屏幕大小
        
        float sprite_scale = 2.0;
        CCSprite *Player =  CCSprite::create("Player.png");
        Player->setScale(sprite_scale);
        Player->setPosition(ccp(Player->getContentSize().width*sprite_scale/2.0, winSize.height/2.0));
        this->addChild(Player);
        
        this->schedule(schedule_selector(HelloWorld::gameLogic), 1.0);
        
        return true;
    }
    else{
        return false;
    }

    
}

void HelloWorld::gameLogic(cocos2d::CCTime dt){
    this->addTarget();
}



void HelloWorld::addTarget(){
    
    CCSize winSize = CCDirector::sharedDirector()->getWinSize();
    
    CCSprite *target = CCSprite::create("Target.png");
    
    //随机位置
    int minY = target->getContentSize().height/2.0;
    int maxY = winSize.height - target->getContentSize().height/2.0;
    int rangeY = maxY - minY;
    int actualY = rand()%rangeY + minY;
    
    target->setPosition(ccp(winSize.width - target->getContentSize().width/2.0, actualY));
    this->addChild(target);
    
    //随机速度
    float minDuration = 2.0;
    float maxDuration = 4.0;
    int rangeDuration = maxDuration - minDuration;
    float actualDuration = rand()%rangeDuration + minDuration;
    
    
    
    
    CCFiniteTimeAction *actionMove = CCMoveTo::create(actualDuration, ccp(0 - target->getContentSize().width/2.0, actualY));//0代表屏幕外，这句表示在3秒内从初始位置移动到屏幕外
    
    
    //增加一个回调函数，回收移动到屏幕外的精灵
    CCFiniteTimeAction *actionMoveDone = CCCallFuncN::create(this, callfuncN_selector(HelloWorld::spriteMoveFinished));
    target->runAction(CCSequence::create(actionMove,actionMoveDone,NULL));
    
}

void HelloWorld::spriteMoveFinished(cocos2d::CCNode *sender){
    CCSprite *sprite = (CCSprite *)sender;
    this->removeChild(sprite, true);
}




void HelloWorld::menuCloseCallback(CCObject* pSender)
{
    CCDirector::sharedDirector()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
}

运行结果如下：