Cocos2d-x 3.1.1 lua-tests开篇
  本篇博客打算从研究Cocos2d-x引擎提供的測试样例来写起，笔者针对Cocos2d-x 3.1.1这个版本号来介绍怎样来学习它给我们提供的样例，通过这些样例来深入学习Cocos2d-x核心API的使用。在学习过程中，笔者相同跟非常多刚開始学习的人一样有非常多疑惑，为了能帮助到很多其它刚開始学习的人，笔者会提出自己的疑惑然后进行解决，笔者会把每个样例都进行具体说明，对相关代码进行凝视，那么以后刚開始学习的人就能够对比笔者的博客来学习Cocos2d-x的使用，我想会事半功倍的。对笔者来说，什么版本号并不重要，重要的是学习的思路，接下来的系列博客就是笔者学习Cocos2d-x的思路。
  怎样開始呢？
  自然先到Cocos2d-x官网下载对应版本号的引擎，笔者这里是Cocos2d-x 3.1.1
  下载完毕后，希望童鞋们自己试着去搭建好开发环境，网络和笔者前面的博客均有介绍，笔者在这里就不多说了。
  最好要在win32平台、Android平台都执行成功过HelloWorld，有了这个基础之后，就能够找样例学习了。
 Cocos2d-x 3.1.1样例的代码在cocos2d-x-3.1.1\tests下：
 
这里就有我们的C++代码和Lua代码，我们要学习的是Lua项目，怎么执行这些项目呢，看下图：
双击使用Visual Studio打开，笔者这里是2012的。
  
右键设置lua-tests为启动项目，然后进行编译执行，成功之后的效果例如以下：
从这些样例，我们能够了解到Cocos2d-x全部相关API所能实现的基础效果，笔者觉得没有不论什么学习资料能比得上这些样例了。
怎么查看实现以上效果的Lua代码呢，以下笔者会给大家介绍。
笔者用到的一个开发工具是LDT,童鞋们能够到这里下载：http://www.eclipse.org/koneki/ldt/
打开LDT，切换工作空间到我们的lua-tests项目中，例如以下：
然后新建Lua项目，取名为src，这样我们就能够把当前文件夹下src全部的Lua代码都包括进来了：
这样我们就能够非常方便查看每个样例的Lua代码，查看它的具体实现。
我们的Lua项目的入口在哪里呢？
打开win32项目，找到AppDelegate.cpp，打开查看：
#include "cocos2d.h"

#include "AppDelegate.h"

#include "CCLuaEngine.h"

#include "audio/include/SimpleAudioEngine.h"

#include "lua_assetsmanager_test_sample.h"

using namespace CocosDenshion;

USING_NS_CC;

AppDelegate::AppDelegate()

{

}

AppDelegate::~AppDelegate()

{

    SimpleAudioEngine::end();

}

bool AppDelegate::applicationDidFinishLaunching()

{

	// 获得导演类实例

    auto director = Director::getInstance();

	// 获取渲染全部东西的 EGLView NA NA

    auto glview = director->getOpenGLView();

    if(!glview) {

        glview = GLView::createWithRect("Lua Tests", Rect(0,0,900,640));

        director->setOpenGLView(glview);

    }

    // turn on display FPS

	// 打开显示帧屏

    director->setDisplayStats(true);

    // set FPS. the default value is 1.0/60 if you don't call this

	// 设置游戏画面每秒显示的帧数，默认是60帧。

    director->setAnimationInterval(1.0 / 60);

	// 获得屏幕大小

    auto screenSize = glview->getFrameSize();

	// 获得设计大小

    auto designSize = Size(480, 320);

    if (screenSize.height > 320)

    {

        auto resourceSize = Size(960, 640);

        director->setContentScaleFactor(resourceSize.height/designSize.height);

    }

	// 设置屏幕设计分辨率

    glview->setDesignResolutionSize(designSize.width, designSize.height, ResolutionPolicy::FIXED_HEIGHT);

    // register lua engine

    LuaEngine* pEngine = LuaEngine::getInstance();

    ScriptEngineManager::getInstance()->setScriptEngine(pEngine);

#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32 || CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID ||CC_TARGET_PLATFORM == CC_PLATFORM_IOS || CC_TARGET_PLATFORM == CC_PLATFORM_MAC)

    LuaStack* stack = pEngine->getLuaStack();

    register_assetsmanager_test_sample(stack->getLuaState());

#endif

	// 执行脚本语言

    pEngine->executeScriptFile("src/controller.lua");

    return true;

}

// This function will be called when the app is inactive. When comes a phone call,it's be invoked too

void AppDelegate::applicationDidEnterBackground()

{

    Director::getInstance()->stopAnimation();

    SimpleAudioEngine::getInstance()->pauseBackgroundMusic();

}

// this function will be called when the app is active again

void AppDelegate::applicationWillEnterForeground()

{

    Director::getInstance()->startAnimation();

    SimpleAudioEngine::getInstance()->resumeBackgroundMusic();

}

我们会发现代码中这么一段：

pEngine->executeScriptFile("src/controller.lua");
这个就是我们的入口文件，我们执行Lua的代码是从controller.lua这个文件開始的。
我们用LDT查看一下它的代码：
-- avoid memory leak

-- 避免内存泄漏

collectgarbage("setpause", 100)

collectgarbage("setstepmul", 5000)

require "src/mainMenu"

----------------

-- run

local glView = cc.Director:getInstance():getOpenGLView()

local screenSize = glView:getFrameSize()

local designSize = {width = 480, height = 320}

local fileUtils = cc.FileUtils:getInstance()

if screenSize.height > 320 then

    local searchPaths = {}

    table.insert(searchPaths, "hd")

    fileUtils:setSearchPaths(searchPaths)

end

local targetPlatform = cc.Application:getInstance():getTargetPlatform()

local resPrefix = ""

if cc.PLATFORM_OS_IPAD  == targetPlatform or cc.PLATFORM_OS_IPHONE == targetPlatform or cc.PLATFORM_OS_MAC == targetPlatform then

    resPrefix = ""

else

    resPrefix = "res/"

end

local searchPaths = fileUtils:getSearchPaths()

table.insert(searchPaths, 1, resPrefix)

table.insert(searchPaths, 1, resPrefix .. "cocosbuilderRes")

if screenSize.height > 320 then

    table.insert(searchPaths, 1, resPrefix .. "hd")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/Images")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/scenetest/ArmatureComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/scenetest/AttributeComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/scenetest/BackgroundComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/scenetest/EffectComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/scenetest/LoadSceneEdtiorFileTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/scenetest/ParticleComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/scenetest/SpriteComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/scenetest/TmxMapComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/scenetest/UIComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/hd/scenetest/TriggerTest")

else

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/Images")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/scenetest/ArmatureComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/scenetest/AttributeComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/scenetest/BackgroundComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/scenetest/EffectComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/scenetest/LoadSceneEdtiorFileTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/scenetest/ParticleComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/scenetest/SpriteComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/scenetest/TmxMapComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/scenetest/UIComponentTest")

    table.insert(searchPaths, 1, resPrefix .. "ccs-res/scenetest/TriggerTest")

end

fileUtils:setSearchPaths(searchPaths)

-- 创建场景

local scene = cc.Scene:create()

-- 加入菜单

scene:addChild(CreateTestMenu())

if cc.Director:getInstance():getRunningScene() then

    cc.Director:getInstance():replaceScene(scene)

else

    -- 依据给定的场景进入 Director的主循环 仅仅能调用他执行你的第一个场景.

    cc.Director:getInstance():runWithScene(scene)

end

然后我们就能够依据这个，来理清整个測试项目的脉路，我们或许想知道，样例中的那些菜单是怎么显示出来的，样例中又是怎样进行切换场景的。仅仅要我们知道怎样開始了，以后我们就能够慢慢分析每个样例所给我提供的代码。

在controller.lua文件里引入了maniMenu.lua
通过这个语句：require "src/mainMenu"
我们来看看mainMenu的代码：
-- 引入资源文件

require "Cocos2d"

require "Cocos2dConstants"

require "Opengl"

require "OpenglConstants"

require "StudioConstants"

require "GuiConstants"

require "src/helper"

require "src/testResource"

require "src/VisibleRect"

require "src/AccelerometerTest/AccelerometerTest"

require "src/ActionManagerTest/ActionManagerTest"

require "src/ActionsEaseTest/ActionsEaseTest"

require "src/ActionsProgressTest/ActionsProgressTest"

require "src/ActionsTest/ActionsTest"

require "src/AssetsManagerTest/AssetsManagerTest"

require "src/BugsTest/BugsTest"

require "src/ClickAndMoveTest/ClickAndMoveTest"

require "src/CocosDenshionTest/CocosDenshionTest"

require "src/CocoStudioTest/CocoStudioTest"

require "src/CurrentLanguageTest/CurrentLanguageTest"

require "src/DrawPrimitivesTest/DrawPrimitivesTest"

require "src/EffectsTest/EffectsTest"

require "src/EffectsAdvancedTest/EffectsAdvancedTest"

require "src/ExtensionTest/ExtensionTest"

require "src/FontTest/FontTest"

require "src/IntervalTest/IntervalTest"

require "src/KeypadTest/KeypadTest"

require "src/LabelTest/LabelTest"

require "src/LabelTestNew/LabelTestNew"

require "src/LayerTest/LayerTest"

require "src/MenuTest/MenuTest"

require "src/MotionStreakTest/MotionStreakTest"

require "src/NewEventDispatcherTest/NewEventDispatcherTest"

require "src/NodeTest/NodeTest"

require "src/OpenGLTest/OpenGLTest"

require "src/ParallaxTest/ParallaxTest"

require "src/ParticleTest/ParticleTest"

require "src/PerformanceTest/PerformanceTest"

require "src/RenderTextureTest/RenderTextureTest"

require "src/RotateWorldTest/RotateWorldTest"

require "src/Sprite3DTest/Sprite3DTest"

require "src/SpriteTest/SpriteTest"

require "src/SceneTest/SceneTest"

require "src/SpineTest/SpineTest"

require "src/Texture2dTest/Texture2dTest"

require "src/TileMapTest/TileMapTest"

require "src/TouchesTest/TouchesTest"

require "src/TransitionsTest/TransitionsTest"

require "src/UserDefaultTest/UserDefaultTest"

require "src/ZwoptexTest/ZwoptexTest"

require "src/LuaBridgeTest/LuaBridgeTest"

require "src/XMLHttpRequestTest/XMLHttpRequestTest"

require "src/PhysicsTest/PhysicsTest"

-- 行间距

local LINE_SPACE = 40

-- 当前位置

local CurPos = {x = 0, y = 0}

-- 開始位置

local BeginPos = {x = 0, y = 0}

-- 定义一张表

local _allTests = {

  { isSupported = true,  name = "Accelerometer"          , create_func=             AccelerometerMain  },

  { isSupported = true,  name = "ActionManagerTest"      , create_func   =         ActionManagerTestMain  },

  { isSupported = true,  name = "ActionsEaseTest"        , create_func   =           EaseActionsTest      },

  { isSupported = true,  name = "ActionsProgressTest"    , create_func   =       ProgressActionsTest      },

  { isSupported = true,  name = "ActionsTest"            , create_func   =               ActionsTest      },

  { isSupported = true,  name = "AssetsManagerTest"      , create_func   =         AssetsManagerTestMain      },

  { isSupported = false,  name = "Box2dTest"              , create_func=                 Box2dTestMain  },

  { isSupported = false,  name = "Box2dTestBed"           , create_func=              Box2dTestBedMain  },

  { isSupported = true,  name = "BugsTest"               , create_func=              BugsTestMain      },

  { isSupported = false,  name = "ChipmunkAccelTouchTest" , create_func=    ChipmunkAccelTouchTestMain  },

  { isSupported = true,  name = "ClickAndMoveTest"       , create_func   =          ClickAndMoveTest      },

  { isSupported = true,  name = "CocosDenshionTest"      , create_func   =         CocosDenshionTestMain  },

  { isSupported = true,  name = "CocoStudioTest"         , create_func   =         CocoStudioTestMain  },

  { isSupported = false,  name = "CurlTest"               , create_func=                  CurlTestMain  },

  { isSupported = true,  name = "CurrentLanguageTest"    , create_func=   CurrentLanguageTestMain      },

  { isSupported = true,  name = "DrawPrimitivesTest"     , create_func=        DrawPrimitivesTest      },

  { isSupported = true,  name = "EffectsTest"            , create_func   =               EffectsTest      },

  { isSupported = true,  name = "EffectAdvancedTest"     , create_func   =        EffectAdvancedTestMain  },

  { isSupported = true,  name = "ExtensionsTest"         , create_func=        ExtensionsTestMain      },

  { isSupported = true,  name = "FontTest"               , create_func   =              FontTestMain      },

  { isSupported = true,  name = "IntervalTest"           , create_func   =              IntervalTestMain  },

  { isSupported = true,  name = "KeypadTest"             , create_func=                KeypadTestMain  },

  { isSupported = true,  name = "LabelTest"              , create_func   =                 LabelTest      },

  { isSupported = true,  name = "LabelTestNew"           , create_func   =                 LabelTestNew      },

  { isSupported = true,  name = "LayerTest"              , create_func   =                 LayerTestMain  },

  { isSupported = true,  name = "LuaBridgeTest"          , create_func   =        LuaBridgeMainTest },

  { isSupported = true,  name = "MenuTest"               , create_func   =                  MenuTestMain  },

  { isSupported = true,  name = "MotionStreakTest"       , create_func   =          MotionStreakTest      },

  { isSupported = false,  name = "MutiTouchTest"          , create_func=          MutiTouchTestMain     },

  { isSupported = true,  name = "NewEventDispatcherTest"  , create_func   =       NewEventDispatcherTest },

  { isSupported = true,  name = "NodeTest"               , create_func   =                  CocosNodeTest },

  { isSupported = true,   name = "OpenGLTest"             , create_func=          OpenGLTestMain     },

  { isSupported = true,  name = "ParallaxTest"           , create_func   =              ParallaxTestMain  },

  { isSupported = true,  name = "ParticleTest"           , create_func   =              ParticleTest      },

  { isSupported = true,  name = "PerformanceTest"        , create_func=           PerformanceTestMain  },

  { isSupported = true,  name = "PhysicsTest"            , create_func =          PhysicsTest  },

  { isSupported = true,  name = "RenderTextureTest"      , create_func   =         RenderTextureTestMain  },

  { isSupported = true,  name = "RotateWorldTest"        , create_func   =           RotateWorldTest      },

  { isSupported = true,  name = "SceneTest"              , create_func   =                 SceneTestMain  },

  { isSupported = true,  name = "SpineTest"              , create_func   =                 SpineTestMain  },

  { isSupported = false,  name = "SchdulerTest"           , create_func=              SchdulerTestMain  },

  { isSupported = false,  name = "ShaderTest"             , create_func=            ShaderTestMain      },

  { isSupported = true,  name = "Sprite3DTest"           , create_func   =                Sprite3DTest    },

  { isSupported = true,  name = "SpriteTest"             , create_func   =                SpriteTest      },

  { isSupported = false,  name = "TextInputTest"          , create_func=             TextInputTestMain  },

  { isSupported = true,  name = "Texture2DTest"          , create_func   =             Texture2dTestMain  },

  { isSupported = false,  name = "TextureCacheTest"       , create_func=      TextureCacheTestMain      },

  { isSupported = true,  name = "TileMapTest"            , create_func   =               TileMapTestMain  },

  { isSupported = true,  name = "TouchesTest"            , create_func   =               TouchesTest      },

  { isSupported = true,  name = "TransitionsTest"        , create_func   =           TransitionsTest      },

  { isSupported = true,  name = "UserDefaultTest"        , create_func=           UserDefaultTestMain  },

  { isSupported = true,  name = "XMLHttpRequestTest"     , create_func   =        XMLHttpRequestTestMain  },

  { isSupported = true,  name = "ZwoptexTest"            , create_func   =               ZwoptexTestMain  }

}

local TESTS_COUNT = table.getn(_allTests)

-- create scene 创建场景

local function CreateTestScene(nIdx)

  cc.Director:getInstance():purgeCachedData()

  local scene = _allTests[nIdx].create_func()

  return scene

end

-- create menu 创建菜单

function CreateTestMenu()

  -- 菜单层

  local menuLayer = cc.Layer:create()

  local function closeCallback()

    -- 结束执行，释放正在执行的场景。

    cc.Director:getInstance():endToLua()

  end

  -- 菜单回调

  local function menuCallback(tag)

    print(tag)

    local Idx = tag - 10000

    local testScene = CreateTestScene(Idx)

    if testScene then

      -- 切换场景

      cc.Director:getInstance():replaceScene(testScene)

    end

  end

  -- add close menu 加入关闭菜单

  local s = cc.Director:getInstance():getWinSize()

  local CloseItem = cc.MenuItemImage:create(s_pPathClose, s_pPathClose)

  CloseItem:registerScriptTapHandler(closeCallback)

  CloseItem:setPosition(cc.p(s.width - 30, s.height - 30))

  local CloseMenu = cc.Menu:create()

  CloseMenu:setPosition(0, 0)

  CloseMenu:addChild(CloseItem)

  menuLayer:addChild(CloseMenu)

  -- 获取目标平台

  local targetPlatform = cc.Application:getInstance():getTargetPlatform()

  if (cc.PLATFORM_OS_IPHONE == targetPlatform) or (cc.PLATFORM_OS_IPAD == targetPlatform) then

    CloseMenu:setVisible(false)

  end

  -- add menu items for tests

  -- 加入菜单项

  local MainMenu = cc.Menu:create()

  local index = 0

  local obj = nil

  for index, obj in pairs(_allTests) do

    -- 创建文本（obj.name 为文本名称， s_arialPath为字体，24为字体大小）

    local testLabel = cc.Label:createWithTTF(obj.name, s_arialPath, 24)

    -- 设置锚点

    testLabel:setAnchorPoint(cc.p(0.5, 0.5))

    -- 创建菜单项标签

    local testMenuItem = cc.MenuItemLabel:create(testLabel)

    -- 假设此项不支持，则设置菜单项不可用

    if not obj.isSupported then

      testMenuItem:setEnabled(false)

    end

    --　注冊脚本处理句柄

    testMenuItem:registerScriptTapHandler(menuCallback)

    -- 设置菜单标签显示的位置，设置到居中的位置

    testMenuItem:setPosition(cc.p(s.width / 2, (s.height - (index) * LINE_SPACE)))

    -- 加入菜单项到菜单中去

    MainMenu:addChild(testMenuItem, index + 10000, index + 10000)

  end

  -- 设置菜单内容大小

  MainMenu:setContentSize(cc.size(s.width, (TESTS_COUNT + 1) * (LINE_SPACE)))

  MainMenu:setPosition(CurPos.x, CurPos.y)

  -- 将菜单加入到层中去

  menuLayer:addChild(MainMenu)

  -- handling touch events

  -- 处理触摸事件

  local function onTouchBegan(touch, event)

    -- 获取触摸点的位置

    BeginPos = touch:getLocation()

    -- CCTOUCHBEGAN event must return true

    return true

  end

  -- 手指移动时触发

  local function onTouchMoved(touch, event)

    local location = touch:getLocation()

    local nMoveY = location.y - BeginPos.y

    local curPosx, curPosy = MainMenu:getPosition()

    local nextPosy = curPosy + nMoveY

    local winSize = cc.Director:getInstance():getWinSize()

    if nextPosy < 0 then

      MainMenu:setPosition(0, 0)

      return

    end

    if nextPosy > ((TESTS_COUNT + 1) * LINE_SPACE - winSize.height) then

      MainMenu:setPosition(0, ((TESTS_COUNT + 1) * LINE_SPACE - winSize.height))

      return

    end

    --

    MainMenu:setPosition(curPosx, nextPosy)

    BeginPos = {x = location.x, y = location.y}

    CurPos = {x = curPosx, y = nextPosy}

  end

  -- 创建事件监听器

  local listener = cc.EventListenerTouchOneByOne:create()

  -- 注冊事件监听

  listener:registerScriptHandler(onTouchBegan,cc.Handler.EVENT_TOUCH_BEGAN )

  listener:registerScriptHandler(onTouchMoved,cc.Handler.EVENT_TOUCH_MOVED )

  -- 获取事件派发器

  local eventDispatcher = menuLayer:getEventDispatcher()

  eventDispatcher:addEventListenerWithSceneGraphPriority(listener, menuLayer)

  return menuLayer

end

我们就能够发现，这里就是界面中菜单的实现，mainMenu中还引入了其它文件，比方testResource.lua

s_pPathGrossini       = "Images/grossini.png"

s_pPathSister1        = "Images/grossinis_sister1.png"

s_pPathSister2        = "Images/grossinis_sister2.png"

s_pPathB1             = "Images/b1.png"

s_pPathB2             = "Images/b2.png"

s_pPathR1             = "Images/r1.png"

s_pPathR2             = "Images/r2.png"

s_pPathF1             = "Images/f1.png"

s_pPathF2             = "Images/f2.png"

s_pPathBlock          = "Images/blocks.png"

s_back                = "Images/background.png"

s_back1               = "Images/background1.png"

s_back2               = "Images/background2.png"

s_back3               = "Images/background3.png"

s_stars1              = "Images/stars.png"

s_stars2              = "Images/stars2.png"

s_fire                = "Images/fire.png"

s_snow                = "Images/snow.png"

s_streak              = "Images/streak.png"

s_PlayNormal          = "Images/btn-play-normal.png"

s_PlaySelect          = "Images/btn-play-selected.png"

s_AboutNormal         = "Images/btn-about-normal.png"

s_AboutSelect         = "Images/btn-about-selected.png"

s_HighNormal          = "Images/btn-highscores-normal.png"

s_HighSelect          = "Images/btn-highscores-selected.png"

s_Ball                = "Images/ball.png"

s_Paddle              = "Images/paddle.png"

s_pPathClose          = "Images/close.png"

s_MenuItem            = "Images/menuitemsprite.png"

s_SendScore           = "Images/SendScoreButton.png"

s_PressSendScore      = "Images/SendScoreButtonPressed.png"

s_Power               = "Images/powered.png"

s_AtlasTest           = "Images/atlastest.png"

-- tilemaps resource

s_TilesPng            = "TileMaps/tiles.png"

s_LevelMapTga         = "TileMaps/levelmap.tga"

-- spine test resource

s_pPathSpineBoyJson       = "spine/spineboy.json"

s_pPathSpineBoyAtlas       = "spine/spineboy.atlas"

-- fonts resource

s_markerFeltFontPath   = "fonts/Marker Felt.ttf"

s_arialPath            = "fonts/arial.ttf"

s_thonburiPath         = "fonts/Thonburi.ttf"

s_tahomaPath           = "fonts/tahoma.ttf"

这个文件定义了全部的资源路径，一些图片、json资源、字体资源等。

其它相关的文件，笔者在这里就不贴代码，这个大家私下去查看，我在这里仅仅是提供相关的思路，让大家理清怎样使用Cocos2d-x给我们提供的样例进行学习。
下一篇博客，笔者将会介绍第一个样例-重力加速器，非常感谢你的关注。

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