Cocos2d-x-Lua演示样例项目HelloLua
Cocos2d-x-Lua演示样例项目HelloLua
本篇博客介绍Cocos2d-x中Lua的实例项目,就是使用Cocos2d-x创建的初始项目执行所呈现的农场,这里笔者取名为HelloLua。本篇博客会具体在代码中解析Cocos2d-x 3.1.1创建的Lua项目中实例,一些API的使用。
注:本演示样例项目在Mac系统下创建
首先我们来创建一个Cocos2d-x Lua项目,在命令敲入相似以下命令
cocos new HelloLua -p com.wwj.hellolua -l lua -d ~/Cocos2dxProj
这样我们就在Cocos2dxProj文件夹下创建了一个名叫HelloLua的Lua项目
进入我们runtime-src文件夹下打开proj.ios_mac文件夹。双击使用Xcode打开我们的项目:
使用Xcode对我们的Lua项目进行编译并执行,就会呈现一个以下效果的演示样例游戏:
看完效果图之后,来看看我们XCode里面的项目文件结构,例如以下图:
以上画圈的有main.cpp、AppDelegate.h、AppDelegate.cpp、main.lua、hello2.lua
我们以下一个一个来看:
首先来看main.cpp文件,这个文件就是我们程序的入口文件,程序的执行时从这里開始的
》》main.cpp
#include "AppDelegate.h" #include "cocos2d.h" USING_NS_CC; int main(int argc, char *argv[]) { AppDelegate app; return Application::getInstance()->run(); }
以上代码我们能够看到,在main.cpp里,通过#include引入了两个头文件,一个是AppDelegate.h、一个是cocos2d.h。
定义了我们程序的入口方法main,通过执行Application::getInstance()->run()方法来执行我们的程序。
>>>AppDelegate.h
#ifndef __APP_DELEGATE_H__ #define __APP_DELEGATE_H__ #include "cocos2d.h" /** @brief The cocos2d Application. The reason for implement as private inheritance is to hide some interface call by Director. */ class AppDelegate : private cocos2d::Application { public: AppDelegate(); virtual ~AppDelegate(); /** @brief Implement Director and Scene init code here. @return true Initialize success, app continue. @return false Initialize failed, app terminate. */ virtual bool applicationDidFinishLaunching(); /** @brief The function be called when the application enter background @param the pointer of the application */ virtual void applicationDidEnterBackground(); /** @brief The function be called when the application enter foreground @param the pointer of the application */ virtual void applicationWillEnterForeground(); }; #endif // __APP_DELEGATE_H__
>>>AppDelegate.cpp
#include "AppDelegate.h" #include "CCLuaEngine.h" #include "SimpleAudioEngine.h" #include "cocos2d.h" using namespace CocosDenshion; USING_NS_CC; using namespace std; AppDelegate::AppDelegate() { } AppDelegate::~AppDelegate() { SimpleAudioEngine::end(); } bool AppDelegate::applicationDidFinishLaunching() { // initialize director 获得导演类实例 auto director = Director::getInstance(); // 获得OpenGL实例 auto glview = director->getOpenGLView(); if(!glview) { // 指定窗体大小 glview = GLView::createWithRect("HelloLua", Rect(0,0,900,640)); // 设置OpenGL视图 director->setOpenGLView(glview); } // 设置分辨率大小为480*320 glview->setDesignResolutionSize(480, 320, ResolutionPolicy::NO_BORDER); // turn on display FPS 打开帧频,屏幕左下角哪一串数据 // 启用FPS 显示,当前 FPS 会在游戏的左下角显示。FPS也就是屏幕每秒重绘的次数。即每秒帧速率。在游戏开发阶段。能够方便地确定游戏执行是否流畅。 director->setDisplayStats(true); // set FPS. the default value is 1.0/60 if you don't call this // 设置绘制间隔 director->setAnimationInterval(1.0 / 60); // 获得Lua引擎实例 auto engine = LuaEngine::getInstance(); // 设置脚本引擎 ScriptEngineManager::getInstance()->setScriptEngine(engine); // 执行main.lua脚本 if (engine->executeScriptFile("src/main.lua")) { return false; } return true; } // This function will be called when the app is inactive. When comes a phone call,it's be invoked too // 当应用程序将要进入后台时,会调用这种方法 void AppDelegate::applicationDidEnterBackground() { Director::getInstance()->stopAnimation(); SimpleAudioEngine::getInstance()->pauseBackgroundMusic(); } // this function will be called when the app is active again // 该方法与applicationDidEnterBackground() 成对出现。在应用程序回到前台时被调用 void AppDelegate::applicationWillEnterForeground() { Director::getInstance()->startAnimation(); SimpleAudioEngine::getInstance()->resumeBackgroundMusic(); }
我们在AppDelegate类其中能够找到执行我们Lua脚本的方法,以下来看一下main.lua这个文件,我们屏幕显示的逻辑实现全部在这个文件里能够看到:
>>>main.lua
require "Cocos2d" require "Cocos2dConstants" -- cclog cclog = function(...) print(string.format(...)) end -- for CCLuaEngine traceback 输出绑定执行函数发生错误的信息 function __G__TRACKBACK__(msg) cclog("----------------------------------------") cclog("LUA ERROR: " .. tostring(msg) .. "\n") cclog(debug.traceback()) cclog("----------------------------------------") return msg end local function main() collectgarbage("collect") -- avoid memory leak 这是脚本回收參数,避免内存泄漏 collectgarbage("setpause", 100) collectgarbage("setstepmul", 5000) -- 追加资源的搜索顺序 cc.FileUtils:getInstance():addSearchResolutionsOrder("src"); cc.FileUtils:getInstance():addSearchResolutionsOrder("res"); local schedulerID = 0 --support debug 获取目标平台 local targetPlatform = cc.Application:getInstance():getTargetPlatform() if (cc.PLATFORM_OS_IPHONE == targetPlatform) or (cc.PLATFORM_OS_IPAD == targetPlatform) or (cc.PLATFORM_OS_ANDROID == targetPlatform) or (cc.PLATFORM_OS_WINDOWS == targetPlatform) or (cc.PLATFORM_OS_MAC == targetPlatform) then cclog("result is ") --require('debugger')() end -- 相似c++的include,引入文件,会检查是否反复引入 require "hello2" -- 调用外部函数,在hello2.lua中 cclog("result is " .. myadd(1, 1)) --------------- -- 获取可视区域 local visibleSize = cc.Director:getInstance():getVisibleSize() -- 可视原点坐标 OpenGL坐标系,左下角为原点 local origin = cc.Director:getInstance():getVisibleOrigin() -- add the moving dog 加入移动的小松鼠 local function creatDog() -- 每一帧尺寸设置,local表示局部变量 local frameWidth = 105 local frameHeight = 95 -- create dog animate 载入动画资源并创建精灵帧 -- 载入精灵动画所在纹理 local textureDog = cc.Director:getInstance():getTextureCache():addImage("dog.png") -- 设置第一帧帧区域 local rect = cc.rect(0, 0, frameWidth, frameHeight) -- 创建第一帧精灵Frame local frame0 = cc.SpriteFrame:createWithTexture(textureDog, rect) -- 设置第二帧帧区域 rect = cc.rect(frameWidth, 0, frameWidth, frameHeight) -- c创建第二帧精灵Frame local frame1 = cc.SpriteFrame:createWithTexture(textureDog, rect) -- 基于使用第一帧Frame创建Sprite对象 local spriteDog = cc.Sprite:createWithSpriteFrame(frame0) spriteDog.isPaused = false spriteDog:setPosition(origin.x, origin.y + visibleSize.height / 4 * 3) --[[ local animFrames = CCArray:create() animFrames:addObject(frame0) animFrames:addObject(frame1) ]]-- -- 依据帧序列数组创建一个动画animation。帧间隔时间delay等于0.5秒 local animation = cc.Animation:createWithSpriteFrames({frame0,frame1}, 0.5) -- 依据动画animation创建动作实例 local animate = cc.Animate:create(animation); -- 松鼠精灵执行该动作 spriteDog:runAction(cc.RepeatForever:create(animate)) -- moving dog at every frame 用来更新松鼠的位置,后面会调用该函数 local function tick() if spriteDog.isPaused then return end local x, y = spriteDog:getPosition() if x > origin.x + visibleSize.width then x = origin.x else x = x + 1 end spriteDog:setPositionX(x) end -- 生成一个scheule,每帧执行tick函数 schedulerID = cc.Director:getInstance():getScheduler():scheduleScriptFunc(tick, 0, false) return spriteDog end -- create farm 创建地面的农场 local function createLayerFarm() -- 创建一个新的Lyaer用作农场管理 local layerFarm = cc.Layer:create() -- add in farm background 加入农场管理 local bg = cc.Sprite:create("farm.jpg") bg:setPosition(origin.x + visibleSize.width / 2 + 80, origin.y + visibleSize.height / 2) layerFarm:addChild(bg) -- add land sprite 加入地面砖块 for i = 0, 3 do for j = 0, 1 do local spriteLand = cc.Sprite:create("land.png")、 -- 设定每一块砖块位置 spriteLand:setPosition(200 + j * 180 - i % 2 * 90, 10 + i * 95 / 2) layerFarm:addChild(spriteLand) end end -- add crop 加入庄稼,注意crop.png是多张图的合成贴图。所以仅仅取了里面的部分贴图 local frameCrop = cc.SpriteFrame:create("crop.png", cc.rect(0, 0, 105, 95)) for i = 0, 3 do for j = 0, 1 do local spriteCrop = cc.Sprite:createWithSpriteFrame(frameCrop); spriteCrop:setPosition(10 + 200 + j * 180 - i % 2 * 90, 30 + 10 + i * 95 / 2) layerFarm:addChild(spriteCrop) end end -- add moving dog 调用上面的createDog()方面。创建一个移动的松鼠 local spriteDog = creatDog() layerFarm:addChild(spriteDog) -- handing touch events 手指触摸事件处理 local touchBeginPoint = nil -- 手指点击開始 local function onTouchBegan(touch, event) local location = touch:getLocation() cclog("onTouchBegan: %0.2f, %0.2f", location.x, location.y) touchBeginPoint = {x = location.x, y = location.y} -- 保存点击位置 spriteDog.isPaused = true -- 将松鼠暂停移动 -- CCTOUCHBEGAN event must return true return true end -- 手指按住移动 local function onTouchMoved(touch, event) local location = touch:getLocation() cclog("onTouchMoved: %0.2f, %0.2f", location.x, location.y) if touchBeginPoint then -- 将整个农村层拖动。由于之前已经将农场里面全部对象加入layerFarm local cx, cy = layerFarm:getPosition() layerFarm:setPosition(cx + location.x - touchBeginPoint.x, cy + location.y - touchBeginPoint.y) touchBeginPoint = {x = location.x, y = location.y} end end -- 手指离开 local function onTouchEnded(touch, event) local location = touch:getLocation() cclog("onTouchEnded: %0.2f, %0.2f", location.x, location.y) touchBeginPoint = nil -- 点击位置数据清空 spriteDog.isPaused = false -- 恢复松鼠移动 end -- 创建触摸事件监听器 local listener = cc.EventListenerTouchOneByOne:create() -- 注冊touch事件 listener:registerScriptHandler(onTouchBegan,cc.Handler.EVENT_TOUCH_BEGAN ) listener:registerScriptHandler(onTouchMoved,cc.Handler.EVENT_TOUCH_MOVED ) listener:registerScriptHandler(onTouchEnded,cc.Handler.EVENT_TOUCH_ENDED ) local eventDispatcher = layerFarm:getEventDispatcher() -- 加入场景图优先级事件监听 eventDispatcher:addEventListenerWithSceneGraphPriority(listener, layerFarm) local function onNodeEvent(event) if "exit" == event then cc.Director:getInstance():getScheduler():unscheduleScriptEntry(schedulerID) end end layerFarm:registerScriptHandler(onNodeEvent) return layerFarm end -- create menu 创建界面菜单 local function createLayerMenu() -- 创建一个新的Layer管理全部菜单 local layerMenu = cc.Layer:create() local menuPopup, menuTools, effectID -- 点击菜单回调函数 local function menuCallbackClosePopup() -- stop test sound effect 关闭音效 cc.SimpleAudioEngine:getInstance():stopEffect(effectID) menuPopup:setVisible(false) -- 隐藏菜单 end -- 点击菜单回调函数 local function menuCallbackOpenPopup() -- loop test sound effect 打开营销 local effectPath = cc.FileUtils:getInstance():fullPathForFilename("effect1.wav") effectID = cc.SimpleAudioEngine:getInstance():playEffect(effectPath) menuPopup:setVisible(true) end -- add a popup menu 创建弹出的菜单面板 local menuPopupItem = cc.MenuItemImage:create("menu2.png", "menu2.png") menuPopupItem:setPosition(0, 0) menuPopupItem:registerScriptTapHandler(menuCallbackClosePopup) menuPopup = cc.Menu:create(menuPopupItem) menuPopup:setPosition(origin.x + visibleSize.width / 2, origin.y + visibleSize.height / 2) menuPopup:setVisible(false) layerMenu:addChild(menuPopup) -- add the left-bottom "tools" menu to invoke menuPopup -- 加入左下角的工具button。用来弹出菜单面板 local menuToolsItem = cc.MenuItemImage:create("menu1.png", "menu1.png") menuToolsItem:setPosition(0, 0) -- 注冊点击回调地址 menuToolsItem:registerScriptTapHandler(menuCallbackOpenPopup) menuTools = cc.Menu:create(menuToolsItem) local itemWidth = menuToolsItem:getContentSize().width local itemHeight = menuToolsItem:getContentSize().height menuTools:setPosition(origin.x + itemWidth/2, origin.y + itemHeight/2) layerMenu:addChild(menuTools) return layerMenu end -- play background music, preload effect -- uncomment below for the BlackBerry version local bgMusicPath = nil if (cc.PLATFORM_OS_IPHONE == targetPlatform) or (cc.PLATFORM_OS_IPAD == targetPlatform) then bgMusicPath = cc.FileUtils:getInstance():fullPathForFilename("res/background.caf") else bgMusicPath = cc.FileUtils:getInstance():fullPathForFilename("res/background.mp3") end cc.SimpleAudioEngine:getInstance():playMusic(bgMusicPath, true) local effectPath = cc.FileUtils:getInstance():fullPathForFilename("effect1.wav") -- 预载入音效 cc.SimpleAudioEngine:getInstance():preloadEffect(effectPath) -- run local sceneGame = cc.Scene:create() -- 创建场景 sceneGame:addChild(createLayerFarm()) -- 将农场层加入场景 sceneGame:addChild(createLayerMenu()) -- 将菜单界面层加入场景 -- 推断是否有执行的场景 if cc.Director:getInstance():getRunningScene() then cc.Director:getInstance():replaceScene(sceneGame) -- 替换场景 else cc.Director:getInstance():runWithScene(sceneGame) end end --[[ xpcall( 调用函数, 错误捕获函数 ); lua提供了xpcall来捕获异常 xpcall接受两个參数:调用函数、错误处理函数。 当发生错误时,Lua会在栈释放曾经调用错误处理函数,因此能够使用debug库收集错误相关信息。两个经常使用的debug处理函数:debug.debug和debug.traceback 前者给出Lua的提示符,你能够自己动手察看发生错误时的情况; 后者通过traceback创建很多其它的错误信息,也是控制台解释器用来构建错误信息的函数。 --]] local status, msg = xpcall(main, __G__TRACKBACK__) if not status then error(msg) end
这是Cocos2d-x 3.1.1所使用的代码,代码中的凝视已经非常具体了,笔者在这里就不多说,希望大家能认真阅读,跟笔者一起尽快入门Lua在Cocos2dx中的使用。