如何使用Corona SDK检测第一个发生碰撞的对象

2015-10-1 9:29:30
收藏：0
阅读：125
评论：1

function scene:create( event ) -- 载入 Corona 的 "physics" 库 local physics = require "physics" physics.start() -- 设置随机数的种子为当前时间 math.randomseed(os.time())

-- 当场景的视图不存在时调用此函数。
--
-- 在此处插入代码以初始化场景
-- 例如：将显示对象添加到“sceneGroup”中，添加触摸侦听器，等等。
local sound = audio.loadStream("pudi.mp3")
audio.play(sound, { channel=1, loops=-1, fadein=3000})

local sceneGroup = self.view
-- 创建灰色矩形作为背景
local background = display.newImageRect("background.jpg", screenW, screenH )
background.anchorX = 0
background.anchorY = 0

local finishline = display.newRect( 0, 450, 750, 5 )
physics.addBody(finishline,"static",{friction=2.0,bounce=0.3})
finishline.myName = "finishline"

local blueTurtle = display.newImageRect("blueturtle.png",33,42)
physics.addBody(blueTurtle,"dynamic",{friction=2.0,bounce=0})
blueTurtle.myName = "Blue Turtle"

local redTurtle = display.newImageRect("redturtle.png",33,42)
physics.addBody(redTurtle,"dynamic",{friction=2.0,bounce=0})
redTurtle.myName = "Red Turtle"

local greenTurtle = display.newImageRect("turtlegreen.png",33,42)
physics.addBody(greenTurtle,"dynamic",{friction=2.0,bounce=0})
greenTurtle.myName = "Green Turtle"

blueTurtle.x = 50
blueTurtle.y = 25

redTurtle.x = 150
redTurtle.y = 25

greenTurtle.x = 250
greenTurtle.y = 25

local function numberGenerator1()
    local myRandomNumber = math.random(80000, 180000)
    timer.performWithDelay( 1000, numberGenerator)
   return myRandomNumber
end

local function numberGenerator2()
    local myRandomNumber = math.random(80000, 180000)
    timer.performWithDelay( 1000, numberGenerator)
   return myRandomNumber
end

local function numberGenerator3()
    local myRandomNumber = math.random(80000, 180000)
    timer.performWithDelay( 1000, numberGenerator)
   return myRandomNumber
end

time1 = numberGenerator1()
time2 = numberGenerator2()
time3 = numberGenerator3()

transition.to(blueTurtle,{x=50,y=350,time=time1})
transition.to(redTurtle,{x=150,y=350,time=time2})
transition.to(greenTurtle,{x=250,y=350,time=time3})

local function onCollision(event)
    if (event.phase == "began") then
        if(event.object2.myName == 'Blue Turtle') then
             print("Blue Turtle Wins")
             event.object2 = nil
             composer.gotoScene( "instruction", "fade", 500 )

        elseif(event.object2.myName == 'Red Turtle') then
             print("Red Turtle Wins")
             event.object2 = nil
             composer.gotoScene( "instruction", "fade", 500 )

        elseif(event.object2.myName == 'Green Turtle') then
             print("Green Turtle Wins")
             event.object2 = nil
             composer.gotoScene( "instruction", "fade", 500 )

        end
    end

end

Runtime:addEventListener("collision",onCollision)

end

我希望获取第一只到达终点线的龟的名字，然后显示一个 GUI 显示哪只龟胜利了。

点赞
用户3893454
用户3893454

首先，在 if 语句中 gotoScene() 是可以正常工作的...

要解决您的问题，这里是需要做的事情：

1- 将所有的显示对象都插入到 sceneGroup 中，这样当您进入其他场景时，所有对象都会从屏幕上移除。

sceneGroup:insert(background)
sceneGroup:insert(finishline)
sceneGroup:insert(redTurtle)
sceneGroup:insert(blueTurtle)
sceneGroup:insert(greenTurtle)

2- 在离开场景之前，您需要停止音频，移除事件监听器，取消计时器和使用的过渡效果。我注意到您的计时器函数中有一些错误，因此我会修改您的代码为：

  • 不要使用 numberGenerator，您需要调用同一函数以满足定时器的需要。
 local function numberGenerator1()
        local myRandomNumber = math.random(80000, 180000)
        timer1 = timer.performWithDelay( 1000, numberGenerator1)
       return myRandomNumber
    end

 local function numberGenerator2()
        local myRandomNumber = math.random(80000, 180000)
        timer2 = timer.performWithDelay( 1000, numberGenerator2)
       return myRandomNumber
    end

 local function numberGenerator3()
        local myRandomNumber = math.random(80000, 180000)
        timer3 = timer.performWithDelay( 1000, numberGenerator3)
       return myRandomNumber
    end

time1 = numberGenerator1()
time2 = numberGenerator2()
time3 = numberGenerator3()

blueTrans = transition.to(blueTurtle,{x=50,y=350,time=time1})
redTrans = transition.to(redTurtle,{x=150,y=350,time=time2})
greenTrans = transition.to(greenTurtle,{x=250,y=350,time=time3})

然后清理您的场景... 所以在 scene:hide() 中：

Runtime:removeEventListener("collision",onCollision)
transition.cancel ( blueTrans )
transition.cancel ( redTrans )
transition.cancel ( greenTrans )
timer.cancel(timer1)
timer.cancel(timer2)
timer.cancel(timer3)

3 - 对于 gotoScene()，您可以传递一个参数来确定哪只乌龟赢了，因此我在 if 语句中进行了修改：

composer.gotoScene( "instruction", {effect = "fade",time = 500, params = { winningTurtle = "Blue" }})

composer.gotoScene( "instruction", {effect = "fade",time = 500, params = { winningTurtle = "Red" }})

composer.gotoScene( "instruction", {effect = "fade",time = 500, params = { winningTurtle = "Green" }} )

4- 最后..在 instruction.lua 中.. 在 scene:show() 中：

local prevScene = composer.getSceneName( "previous" )
composer.removeScene(prevScene)

并访问前一个文件发送的参数：

local params = event.params
print("The Winning Turtle is :" .. params.winningTurtle)
2015-10-01 15:17:45

作者:

用户5391333

用户5391333
推荐文章