Proxy “什么是？”；错误参数#-1到'；新线'；（预期代理，为零）平均值

我一直在做一个游戏。游戏包括（一部分）获取触摸事件的x和y位置，在触摸事件移动时跟踪它，并将x/y值添加到表中。我已经把它记下来了。但是，当我尝试从表中创建一行时，会出现以下错误：

/Users/jordanmcbride/Desktop/Programing/Lua Projects/When Balls Drop/main.lua:21: bad argument #-1 to 'newLine' (Proxy expected, got nil)
stack traceback:
    [C]: in function 'newLine'
    /Users/jordanmcbride/Desktop/Programing/Lua Projects/When Balls Drop/main.lua:21: in function </Users/jordanmcbride/Desktop/Programing/Lua Projects/When Balls Drop/main.lua:8>
    ?: in function <?:221>

以下是我的全部代码：

    -- Hides the status bar at the top of the screen
display.setStatusBar(display.HiddenStatusBar)

print("App Starting!")

linePositions = {}

function drawLineTouchListener( event )

    if event.phase == "began" then
        currx = event.x
        curry = event.y
        table.insert( linePositions, currx)
        table.insert( linePositions, curry)
    elseif event.phase == "moved" then
        currx = event.x
        curry = event.y
        table.insert( linePositions, currx)
        table.insert( linePositions, curry)
    elseif event.phase == "ended" then
        line = display.newLine( linePositions )
        test = {
        0, 0,
        20, 20,
        40, 40, 
        60, 60, 
        80, 80}

        line2 = display.newLine( test)
        line2:setStrokeColor( black )
    end


    print( "x: "..currx.."  y:"..curry)

end

function playButtonTouch ( event )

    if ( event.phase == "ended" ) then

    end
end

function highScoreButtonTouch ( event )

    if ( event.phase == "ended" ) then

    end
end

function quitButtonTouch ( event )

    if ( event.phase == "ended" ) then
        os.exit(0)
    end
end


function displayMenu ()
    mainMenuGroup = display.newGroup()

    title = display.newImage(mainMenuGroup, "Title.png", display.contentCenterX, 20) 
    title:scale( .3, .3 )

    playButton = display.newImage(mainMenuGroup, "Play Button.png", display.contentCenterX, display.contentHeight - 300)
    playButton:scale( .3, .3 )

    quitButton = display.newImage(mainMenuGroup, "Quit Button.png", display.contentCenterX, display.contentHeight - 200)
    quitButton:scale( .3, .3 )

    highScoreButton = display.newImage(mainMenuGroup, "Highscore Button.png", display.contentCenterX, display.contentHeight - 100)
    highScoreButton:scale( .3, .3 )

    playButton:addEventListener( "touch", playButtonTouch )

    quitButton:addEventListener( "touch", quitButtonTouch )

    highScoreButton:addEventListener( "touch", highScoreButtonTouch )
end


--Creates a solid white background that doubles for a touch listner
background = display.newRect( display.contentCenterX, display.contentCenterY, display.contentWidth, display.contentHeight+100)
background:setFillColor(1, 1, 1 )

background:addEventListener( "touch", drawLineTouchListener )

displayMenu()

---

您的问题源于这样一个事实：当函数需要单个参数时，您正在传递一个表

相反，使用

unpack（linePositions）

将“解包”表中的所有内容（通过将其作为元组返回）

---

请注意在Lua5.2及更高版本中，它是table.unpack。

您看过文档了吗？@greatwolf是的，我从中得到的只是如何创建一条带有预定义点的线。例如：本地myLine=display.newLine（0,010010）。而且你不能点击它们…试着

解包（行位置）

并将其传递给

显示。newLine

@greatwolf工作起来很有魅力。非常感谢。（您应该将其添加到解决方案中，并进行一些解释）：）

    -- Hides the status bar at the top of the screen
display.setStatusBar(display.HiddenStatusBar)

print("App Starting!")

linePositions = {}

function drawLineTouchListener( event )

    if event.phase == "began" then
        currx = event.x
        curry = event.y
        table.insert( linePositions, currx)
        table.insert( linePositions, curry)
    elseif event.phase == "moved" then
        currx = event.x
        curry = event.y
        table.insert( linePositions, currx)
        table.insert( linePositions, curry)
    elseif event.phase == "ended" then
        line = display.newLine( linePositions )
        test = {
        0, 0,
        20, 20,
        40, 40, 
        60, 60, 
        80, 80}

        line2 = display.newLine( test)
        line2:setStrokeColor( black )
    end


    print( "x: "..currx.."  y:"..curry)

end

function playButtonTouch ( event )

    if ( event.phase == "ended" ) then

    end
end

function highScoreButtonTouch ( event )

    if ( event.phase == "ended" ) then

    end
end

function quitButtonTouch ( event )

    if ( event.phase == "ended" ) then
        os.exit(0)
    end
end


function displayMenu ()
    mainMenuGroup = display.newGroup()

    title = display.newImage(mainMenuGroup, "Title.png", display.contentCenterX, 20) 
    title:scale( .3, .3 )

    playButton = display.newImage(mainMenuGroup, "Play Button.png", display.contentCenterX, display.contentHeight - 300)
    playButton:scale( .3, .3 )

    quitButton = display.newImage(mainMenuGroup, "Quit Button.png", display.contentCenterX, display.contentHeight - 200)
    quitButton:scale( .3, .3 )

    highScoreButton = display.newImage(mainMenuGroup, "Highscore Button.png", display.contentCenterX, display.contentHeight - 100)
    highScoreButton:scale( .3, .3 )

    playButton:addEventListener( "touch", playButtonTouch )

    quitButton:addEventListener( "touch", quitButtonTouch )

    highScoreButton:addEventListener( "touch", highScoreButtonTouch )
end


--Creates a solid white background that doubles for a touch listner
background = display.newRect( display.contentCenterX, display.contentCenterY, display.contentWidth, display.contentHeight+100)
background:setFillColor(1, 1, 1 )

background:addEventListener( "touch", drawLineTouchListener )

displayMenu()