cocos2dx+lua 第一次使用物理引擎

MainScene.lua

local MainScene = class("MainScene", cc.load("mvc").ViewBase)
local FootBallGame = import(".FootBallGame")
function MainScene:onCreate()
-- add playbutton
    local playButton = cc.MenuItemImage:create("button_play.png", "button_playclicked.png")
        :onClicked(function() 
           --local scene = self:getApp():getSceneByName("PlayScene")
           local scene = FootBallGame:create()
           local transition = cc.TransitionSlideInR:create(0.5, scene)
           cc.Director:getInstance():replaceScene(transition)

        end)
    cc.Menu:create(playButton)
        :move(cc.p(display.cx, display.cy - 100))
        :addTo(self)
end 
return MainScene

FootBallGame.lua

--創建普通Scene
--local FootBallGame = class("FootBallGame", function()
--    return cc.Scene:create()
--end)
--local FootBallGame = class("FootBallGame", cc.Scene)


--創建帶物理世界的Scene
local FootBallGame = class("FootBallGame", function()
        return cc.Scene:createWithPhysics()
end)

function FootBallGame:ctor()
    -- add background image
    display.newSprite("bg_dayLong.png")
        :move(display.center)
        :addTo(self)

    --設置重力
    self:getPhysicsWorld():setGravity(cc.vertex2F(0,-980))

    --創建物理世界邊界
    local edge = cc.Node:create()
    --創建一個不受重力影響的矩形邊界並綁定到Node結點上
    edge:setPhysicsBody(cc.PhysicsBody:createEdgeBox(cc.Director:getInstance():getVisibleSize()))
    edge:setPosition(display.center)
    self:addChild(edge)

    --註冊鼠標監聽事件，點擊觸發onTouch函數
    local listener = cc.EventListenerTouchOneByOne:create()
    listener:registerScriptHandler(function(touch, event)
        self:onTouch(touch, event)
    end,cc.Handler.EVENT_TOUCH_BEGAN)
    self:getEventDispatcher():addEventListenerWithSceneGraphPriority(listener, self)
    self._touchListener = listener
end

--定義callback函數
function FootBallGame:onTouch(touch,event)
    local location = touch:getLocation()
    local x,y = location.x,location.y
    local football = cc.Sprite:create("football.png")
    local size = football:getContentSize()
    football:setPosition(x,y)
    --創建一個圓形剛體綁定到Sprite上
    football:setPhysicsBody(cc.PhysicsBody:createCircle(size.width/2))
    --給剛體設置初速度
    football:getPhysicsBody():setVelocity(cc.vertex2F(0,300))
    self:addChild(football)
    return true
end

return FootBallGame

效果：點擊屏幕則在點擊處生成一個具有向上初速度的足球，足球在重力下自由下落，最終停在邊界上。不同的小球之間、小球與邊界之間都會產生碰撞。