cocos2d-x学习笔记(8)--progress(进度条)

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cocos2d-x学习笔记(7)--progress(进度条)
在一些游戏中，我们会见到游戏载入进度，或者在游戏统计成绩时，见到一些饼状图。下面我们就来学习进度条。
这次要学习两个类：
1.CCProgressTo
2.CCProgressTimer
在cocos2d-x 的online api document中我们可以看到CCProgressTo的继承关系：

就是说CCProgressTo其实就是设置动作的一个类，只不过多了进度条特有的属性。
step1:创建cocos2d-win32 application，并命名为progress
step2:在HelloWorldScene.h中添加如下几个类：
[cpp]
class SpriteDemo:public CCLayer
{

public:
    virtual std::string title();
    virtual void onEnter();

    void backCallback(CCObject* pSender);
    void restartCallback(CCObject* pSender);
    void nextCallback(CCObject*pSender);

};

class SpriteProgressToRadial : public SpriteDemo
{
public:
    virtual void onEnter();
    virtual std::string title();
};

class SpriteProgressToHorizontal : public SpriteDemo
{
public:
    virtual void onEnter();
    virtual std::string title();
};

class SpriteProgressToVertical : public SpriteDemo
{
public:
    virtual void onEnter();
    virtual std::string title();
};

在HelloWorldScene.cpp中修改scene函数：
[cpp] view plaincopy
CCScene* HelloWorld::scene()
{
    CCScene * scene = NULL;
    do
    {
        // 'scene' is an autorelease object
        scene = CCScene::node();
        CC_BREAK_IF(! scene);

        // 'layer' is an autorelease object
        SpriteProgressToRadial* layer = new SpriteProgressToRadial();

        CC_BREAK_IF(! layer);

        // add layer as a child to scene
        scene->addChild(layer);
    } while (0);

    // return the scene
    return scene;
}

同时添加如下函数：
[cpp]
/************************************************************************/
/* SpriteDemo                                                                     */
/************************************************************************/

std::string SpriteDemo::title()
{
    return "ProgressActionsTest";
}

void SpriteDemo::onEnter()
{
    CCLayer::onEnter();

    CCSize size = CCDirector::sharedDirector()->getWinSize();

    //添加标题
    std::string strTitle = title();
    const char* ptitle = strTitle.c_str();
    CCLabelTTF* label = CCLabelTTF::labelWithString(ptitle,"Arial", 28);
    label->setPosition(ccp(size.width/2, size.height-30));
    addChild(label);

    //添加基本按钮
    CCLabelTTF* pNextLabel = CCLabelTTF::labelWithString("Next ", "Arial", 28);
    CCLabelTTF*pBackLabel = CCLabelTTF::labelWithString("Back ", "Arial", 28);
    CCLabelTTF*pRestartLabel = CCLabelTTF::labelWithString("Restart ", "Arial", 28);

    CCMenuItemLabel* pNextItem = CCMenuItemLabel::itemWithLabel(
        pNextLabel, this, menu_selector(SpriteDemo::nextCallback));
    CCMenuItemLabel* pBackItem = CCMenuItemLabel::itemWithLabel(
        pBackLabel, this, menu_selector(SpriteDemo::backCallback));
    CCMenuItemLabel* pRestartItem = CCMenuItemLabel::itemWithLabel(
        pRestartLabel, this, menu_selector(SpriteDemo::restartCallback));

    CCMenu* pNextMenu = CCMenu::menuWithItem(pNextItem);
    CCMenu* pBackMenu = CCMenu::menuWithItem(pBackItem);
    CCMenu* pRestartMenu = CCMenu::menuWithItem(pRestartItem);

    pNextItem->setPosition(ccp(size.width/2 +150, 50));
    pBackItem->setPosition(ccp(size.width/2 - 150, 50));
    pRestartItem->setPosition(ccp(size.width/2 , 50));

    pNextMenu->setPosition(CCPointZero);
    pBackMenu->setPosition(CCPointZero);
    pRestartMenu->setPosition(CCPointZero);

    addChild(pNextMenu,1);
    addChild(pBackMenu, 1);
    addChild(pRestartMenu,1);

}

void SpriteDemo::backCallback(CCObject* pSender)
{
    if(index == 1)
        return;
    index--;
    CCScene* scene = new CCScene();
    CCLayer* layer = runThisTest(index);
    scene->addChild(layer);
    CCDirector::sharedDirector()->replaceScene(scene);
    scene->release();
    layer->release();

}

void SpriteDemo::restartCallback(CCObject* pSender)
{
    CCScene* scene = new CCScene();
    CCLayer* layer = runThisTest(index);
    scene->addChild(layer);
    CCDirector::sharedDirector()->replaceScene(scene);
    scene->release();
    layer->release();
}

void SpriteDemo::nextCallback(CCObject* pSender)
{
    if(index == MAX_INDEX)
        return;
    index++;
    CCScene* scene = new CCScene();
    CCLayer* layer = runThisTest(index);
    scene->addChild(layer);
    CCDirector::sharedDirector()->replaceScene(scene);
    scene->release();
    layer->release();
}

/************************************************************************/
/* SpriteProgressToRadial                                                                     */
/************************************************************************/

std::string SpriteProgressToRadial::title()
{
    return "SpriteProgressToRadial";
}

void SpriteProgressToRadial::onEnter()
{
    SpriteDemo::onEnter();

    CCSize size = CCDirector::sharedDirector()->getWinSize();

    CCProgressTo* p1 = CCProgressTo::actionWithDuration(2,80);
    //第一个参数是时间，第二个参数是表示只旋转80%

    CCProgressTimer* pt = CCProgressTimer::progressWithFile("radial.png");
    pt->setType(kCCProgressTimerTypeRadialCW);
    addChild(pt);
    pt->setPosition(ccp(size.width / 2, size.height / 2));
    pt->runAction(CCRepeatForever::actionWithAction(p1));
}

/************************************************************************/
/* SpriteProgressToHorizontal                                                                     */
/************************************************************************/

std::string SpriteProgressToHorizontal::title()
{
    return "SpriteProgressToHorizontal";
}

void SpriteProgressToHorizontal::onEnter()
{
    SpriteDemo::onEnter();

    CCSize size = CCDirector::sharedDirector()->getWinSize();

    CCProgressTo* to = CCProgressTo::actionWithDuration(2,100);
    CCProgressTimer*pt = CCProgressTimer::progressWithFile("horizonal.png");
    pt->setType(kCCProgressTimerTypeHorizontalBarLR);
    addChild(pt);
    pt->setPosition(ccp(size.width / 2, size.height / 2));
    pt->runAction(CCRepeatForever::actionWithAction(to));
}

/************************************************************************/
/* SpriteProgressToVertical                                                                     */
/************************************************************************/

std::string SpriteProgressToVertical::title()
{
    return "SpriteProgressToVertical";
}

void SpriteProgressToVertical::onEnter()
{
    SpriteDemo::onEnter();

    CCSize size = CCDirector::sharedDirector()->getWinSize();
    CCProgressTo* to = CCProgressTo::actionWithDuration(2,100);
    CCProgressTimer*pt = CCProgressTimer::progressWithFile("vertical.png");
    pt->setType(kCCProgressTimerTypeVerticalBarBT);
    pt->setPosition(ccp(size.width / 2, size.height / 2));
    addChild(pt);
    pt->runAction(CCRepeatForever::actionWithAction(to));

}