cocos2dX 学习笔记——音乐、音效和进度条

每个游戏都需要音乐和音效，当然进度条也是必不可少一种，可以用于于技能CD，所以就用代码介绍和实现一下以上三种。

.cpp中

#include "FifthScene.h"
#include "HelloWorldScene.h"
#include "cocos2d.h"
#include "fourthScene.h"

//音乐需要SimpleAudioEngine头文件还需要CocosDenshion命名空间;
#include "SimpleAudioEngine.h"
using namespace CocosDenshion;

USING_NS_CC;

cocos2d::CCScene * FifthScene::createScene()
{
   CCScene * scene = CCScene::create();
   FifthScene * layer = FifthScene::create();
   scene->addChild(layer);
   return scene;
}

bool FifthScene::init()
{
   if (!Layer::init())
   {
       return false;
   }

//MenuItemSprite;
   Sprite * spriteNormal = Sprite::create("shi.png");
   Sprite * spriteSelect = Sprite::create("ming.png");
   MenuItemSprite * pMenuItem = MenuItemSprite::create(
       spriteNormal,
       spriteSelect,
       CC_CALLBACK_1(FifthScene::EnterFifthScene, this));

//MenuItemLabel;
   Label * label1 = Label::create("This is My FifthScene", "calibri.ttf", 30);
   label1->setColor(Color3B(255, 0, 0));
   MenuItemLabel * pMenuItemLabel = MenuItemLabel::create(label1, CC_CALLBACK_1(FifthScene::EnterFifthScene, this));

//MenuItemToggle;
   //未选中的精灵;
   auto spriteNToggle = Sprite::create("quan.png");
   //选中状态的精灵;
   auto spriteToggle = Sprite::create("yuan.png");
   //将精灵包装成Menuitem 用于创建toggle;
   auto musicOn = MenuItemSprite::create(spriteToggle, spriteToggle);
   auto musicOff = MenuItemSprite::create(spriteNToggle, spriteNToggle);
   //创建toggle;
   MenuItemToggle * menuItemToggle = MenuItemToggle::createWithCallback(
       CC_CALLBACK_1(FifthScene::menuCallBack, this),
       musicOn,
       musicOff,
       NULL);

//auto menu = Menu::create(menuItemToggle, NULL);
   //this->addChild(menu);

//创建音乐音效点击按钮;
   MenuItemSprite * btnMenuSprite = MenuItemSprite::create(
       Sprite::create("ren.png"),
       Sprite::create("li.png"),
       CC_CALLBACK_1(FifthScene::btnSpriteCallBack, this));
   //预加载;
   SimpleAudioEngine::sharedEngine()->preloadBackgroundMusic("yue.wav");
   SimpleAudioEngine::sharedEngine()->preloadEffect("yin.wav");
   //播放音乐;
   SimpleAudioEngine::sharedEngine()->playBackgroundMusic("yue.wav");
   isPause = false;

//创建Menu;
   Menu * pMenu = Menu::create(pMenuItem, pMenuItemLabel, menuItemToggle, btnMenuSprite, NULL);
   pMenu->setPosition(Director::getInstance()->convertToUI(Point(500, 300)));
   //间隔;
   pMenu->alignItemsVerticallyWithPadding(55);
   this->addChild(pMenu);
   pMenuItem->setScale(3);

创建进度条;
   //表示进度条到多少百分比执行3秒停在80%;
   //auto progressTo=ProgressTo::create(3,80);
   //表示进度条从百分几到百分几执行三秒从20% 到80% ;
   //auto progressFromTo = ProgressFromTo::create(3,20,80);
   //   ProgressTimer 用来渲染精灵对象的百分比有三种形态Radial, Horizontal or vertical ;
   //首先生成一个ProgressTimer对象;
   //auto pgTimer = ProgressTimer::create(Sprite::create("xuan.png"));
   设置进度条类型;
   //pgTimer->setType(ProgressTimer::Type::BAR);
   添加到this中;
   //this->addChild(pgTimer);
   让进度条动起来;
   //pgTimer->runAction(RepeatForever::create(progressTo));

/*setMidpoint;
   MidPoint点是用来定义一个进度条的起点位置，如果用的是radials 那就是中心点位置;
   如果是bar ;
   从左到右，设置midpoint为Point(0,y) ;
   从右到左，设置midpoint为Point(1,y)   ;
   从上到下，设置midpoint为Point(x,1) ;
   从下到上，设置midpoint为Point(x,0)   ;

setBarChangeRate: 分别表示x轴的改变与y轴的改变;
   midpoint需要和BarChangeRate配合才能展示出不同效果进度条
   Point(x,y);表示动画完成后x轴与y轴分别的改变量
   point(0,1);表示最后水平方向不变只是竖直方向改变了1也就是100%

*/

//圆形进度条;
   //首先创建一张图片;
   auto sp1 = Sprite::create("yuan.png");
   //设置进度条的速度和到达目标量;
   auto pt1 = ProgressTo::create(3.0f, 85);
   //生成一个ProgressTimer对象;
   auto ptm1 = ProgressTimer::create(sp1);
   //设置进度条类型;
   ptm1->setType(ProgressTimerType::RADIAL);
   //使进度条运动;
   ptm1->runAction(RepeatForever::create(pt1));
   ptm1->setPosition(Point(100, 500));
   this->addChild(ptm1);

//条形进度条;
   //从左到右;
   auto sp2 = Sprite::create("xuan.png");
   auto pt2 = ProgressTo::create(5.0f, 100);
   auto ptm2 = ProgressTimer::create(sp2);
   ptm2->setType(ProgressTimerType::BAR);
   ptm2->runAction(pt2);
   ptm2->setMidpoint(Point(0, 1));
   ptm2->setBarChangeRate(Point(1, 0));
   ptm2->setPosition(300, 500);
   this->addChild(ptm2);

//从下到上;
   auto sp3 = Sprite::create("xuan.png");
   auto pt3 = ProgressTo::create(3.5f, 75);
   auto ptm3 = ProgressTimer::create(sp3);
   ptm3->setType(ProgressTimerType::BAR);
   ptm3->runAction(RepeatForever::create(pt3));
   ptm3->setMidpoint(Point(1, 0));
   ptm3->setBarChangeRate(Point(0, 1));
   ptm3->setPosition(Point(550, 500));
   this->addChild(ptm3);

//变幻形态;
   auto sp4 = Sprite::create("yuan.png");
   auto pt4 = ProgressTo::create(4.5f, 100);
   auto ptm4 = ProgressTimer::create(sp4);
   ptm4->setType(ProgressTimerType::RADIAL);
   ptm4->setPosition(Point(600, 500));
   //从当前的tint转换为自定义的tint;
   auto tint = Sequence::create(
       TintTo::create(3, 255, 0, 0),
       TintTo::create(2, 0, 255, 0),
       TintTo::create(5, 0, 0, 255),
       NULL);
   //淡入实现;
   auto fade = Sequence::create(
       FadeTo::create(3, 0),
       FadeTo::create(3, 255),
       NULL);

ptm4->runAction(RepeatForever::create(pt4));
   ptm4->runAction(RepeatForever::create(tint));
   //ptm4->runAction(RepeatForever::create(fade));
   this->addChild(ptm4);

return true;
}

void FifthScene::EnterFifthScene(Ref * ref)
{
   Director::getInstance()->replaceScene(TransitionFadeTR::create(1.0f, HelloWorld::createScene()));
}

//参数Ref标识点击的MenuItem;
void FifthScene::menuCallBack(Ref * ref)
{
   auto item = (MenuItemToggle *)ref;
   //获取当前选择的下标根据下标TODO ;
   item->getSelectedIndex();
   CCLOG("%d", item->getSelectedIndex());
   if (item->getSelectedIndex() == 0)
   {
   }
   else if (item->getSelectedIndex() == 1)
   {
       关于音乐;
       预加载背景音乐;
       //SimpleAudioEngine::sharedEngine()->preloadBackgroundMusic("music.mp3");
       开始播放背景音乐， true 标识循环;
       //SimpleAudioEngine::sharedEngine()->playBackgroundMusic("music.mp3", true);
       停止背景音乐传参代表是否释放音乐文件;
       //SimpleAudioEngine::sharedEngine()->stopBackgroundMusic();
       暂停背景音乐;
       //SimpleAudioEngine::sharedEngine()->pauseBackgroundMusic();
       重新调用背景音乐;
       //SimpleAudioEngine::sharedEngine()->resumeBackgroundMusic();
       返回不二类型参数，表示是否再放背景音乐;
       //SimpleAudioEngine::sharedEngine()->isBackgroundMusicPlaying();
       设置音量0.0-1.0;
       //SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(0.5f);
       //音乐释放;
       //SimpleAudioEngine::sharedEngine()->end();

关于音效;
       预加载背景音效;
       //SimpleAudioEngine::sharedEngine()->preloadEffect("music.mp3");
       开始播放音效 false代表不循环;
       //SimpleAudioEngine::sharedEngine()->playEffect("music.mp3",false);
       停止音效可以选择单独停掉一个音效这个值是由playEffect返回的;
       //SimpleAudioEngine::sharedEngine()->stopEffect(2);
       停止所有音效;
       //SimpleAudioEngine::sharedEngine()->stopAllEffects();
       暂停音效;
       //SimpleAudioEngine::sharedEngine()->pauseEffect(2);
       重新开始音效;
       //SimpleAudioEngine::sharedEngine()->resumeEffect(2);
       暂停所有音效;
       //SimpleAudioEngine::sharedEngine()->pauseAllEffects();
       重新开始所有音效;
       //SimpleAudioEngine::sharedEngine()->resumeAllEffects();
       设置音效音量;
       //SimpleAudioEngine::sharedEngine()->setEffectsVolume(0.5);
       卸载音效;
       //SimpleAudioEngine::sharedEngine()->unloadEffect("music.mp3");
       //获取音量;
       //SimpleAudioEngine::sharedEngine()->getBackgroundMusicVolume();

}
}

void FifthScene::btnSpriteCallBack(Ref * ref)
{
   if (isPause == false)
   {
       SimpleAudioEngine::sharedEngine()->pauseBackgroundMusic();
       isPause = true;
       CCLOG("false");
   }
   else
   {
       SimpleAudioEngine::sharedEngine()->resumeBackgroundMusic();
       SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(0.5);
       isPause = false;
       CCLOG("true");
   }

}

.h中

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