Lua 错误:参数 #1 无效为“new”(预期为 Vector3,得到 Vector2)

Lua error : invalid argument #1 to 'new' (Vector3 expected, got Vector2)

提问人:Adrian Nugroho 提问时间:6/6/2023 最后编辑:NifimAdrian Nugroho 更新时间:6/7/2023 访问量:239

问:

我想做一个像skriblio一样的游戏。所以我创建了 gui 并尝试连接它们。并编写逻辑代码 尝试运行脚本时出现错误 我的脚本有问题吗?错误在第 12 行 这是我的代码

local UserInputService = game:GetService("UserInputService")
local currentTool = "Line" -- Ganti dengan alat default Anda
local currentColor = Color3.new(0, 0, 0) -- Ganti dengan warna default Anda
local canvas = script.Parent -- Ganti dengan objek "canvas" yang sesuai

local function drawLine(startPoint, endPoint)
    local line = Instance.new("Part")
    line.Anchored = true
    line.Material = Enum.Material.SmoothPlastic
    line.BrickColor = BrickColor.new(currentColor)
    line.Size = Vector3.new((startPoint - endPoint).Magnitude, 0.2, 0.2)
    line.CFrame = CFrame.new((startPoint + endPoint) / 2, Vector3.new(endPoint.X, endPoint.Y, 0))
    line.Parent = canvas
end

local function drawCircle(center, radius)
    local circle = Instance.new("Part")
    circle.Anchored = true
    circle.Material = Enum.Material.SmoothPlastic
    circle.BrickColor = BrickColor.new(currentColor)
    circle.Shape = Enum.PartType.Cylinder
    circle.Size = Vector3.new(radius * 2, 0.2, radius * 2)
    circle.CFrame = CFrame.new(center) + Vector3.new(0, 0.1, 0)
    circle.Parent = canvas
end

local function drawFreehand(startPoint, endPoint)
    local line = Instance.new("Part")
    line.Anchored = true
    line.Material = Enum.Material.SmoothPlastic
    line.BrickColor = BrickColor.new(currentColor)
    line.Size = Vector3.new(0.2, 0.2, (startPoint - endPoint).Magnitude)
    line.CFrame = CFrame.new((startPoint + endPoint) / 2, Vector3.new(endPoint.X, endPoint.Y, 0))
    line.Parent = canvas
end

local function erase(startPoint, endPoint)
    -- Dapatkan semua objek anak di dalam "canvas"
    local canvasChildren = canvas:GetChildren()

    -- Iterasi melalui semua objek anak dan periksa apakah mereka berada dalam wilayah yang ditentukan
    for _, child in ipairs(canvasChildren) do
        if child:IsA("BasePart") then
            local position = child.Position
            if position.X >= startPoint.X and position.X <= endPoint.X and
                position.Y >= startPoint.Y and position.Y <= endPoint.Y then
                child:Destroy()
            end
        end
    end
end
UserInputService.InputBegan:Connect(function(input)
    if input.UserInputType == Enum.UserInputType.MouseButton1 then
        local startPoint = UserInputService:GetMouseLocation()

        if currentTool == "Line" then
            -- Menggambar garis
            UserInputService.InputEnded:Wait()
            local endPoint = UserInputService:GetMouseLocation()
            drawLine(startPoint, endPoint)
        elseif currentTool == "Circle" then
            -- Menggambar lingkaran
            UserInputService.InputEnded:Wait()
            local endPoint = UserInputService:GetMouseLocation()
            local radius = (startPoint - endPoint).Magnitude
            drawCircle(startPoint, radius)
        elseif currentTool == "Pen" then
            -- Menggambar secara bebas
            local prevPoint = startPoint
            repeat
                local currentPoint = UserInputService:GetMouseLocation()
                drawFreehand(prevPoint, currentPoint)
                prevPoint = currentPoint
                wait()
            until not UserInputService:IsMouseButtonPressed(Enum.UserInputType.MouseButton1)
        elseif currentTool == "Eraser" then
            -- Menghapus
            UserInputService.InputEnded:Wait()
            local endPoint = UserInputService:GetMouseLocation()
            erase(startPoint, endPoint)
        end
    end
end)

我的代码知识非常有限,因为我还在学习,我的问题是什么,我需要改变什么?

矢量 Lua 绘图 roblox 无效参数

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答:

0赞 Kylaaa 6/7/2023 #1

错误告诉你到底出了什么问题。当您尝试创建 CFrame(一个表示空间中的 3D 位置和方向的对象)时,您为其指定了一个 Vector2,而构造函数需要一个 Vector3。

在函数中,通过平均 startPoint 和 endPoint 变量来构造 CFrame,但这两个变量都来自返回 Vector2 的 UserInputService:GetMouseLocation()。drawLine

一个简单的答案可能是尝试将 Vector2 转换为 Vector3,使用与其他 Vector3 相同的系统。

local linePos = (startPoint + endPoint) / 2
line.CFrame = CFrame.new(Vector3.new(linePos.X, linePos.Y, 0), Vector3.new(endPoint.X, endPoint.Y, 0))

但是,您有 2D 屏幕坐标,并且您正在尝试使用它们将对象放置在 3D 空间中。一种方法是将光线投射到空间中并尝试找到它击中的物体。这里建议使用大块作为画布。因此,尝试使用 Mouse 类,而不是 UserInputService:GetMouseLocation()。它带有一个属性,该属性将为您提供工作区内碰撞点的 CFrame。您可以使用它来获取 Vector3。Hit

UserInputService.InputBegan:Connect(function(input)
    if input.UserInputType == Enum.UserInputType.MouseButton1 then
        local mouse = game.Players.LocalPlayer:GetMouse()
        local startPoint = mouse.Hit.p

        if currentTool == "Line" then
            -- Menggambar garis
            UserInputService.InputEnded:Wait()
            local endPoint = mouse.Hit.p
            drawLine(startPoint, endPoint)
        elseif currentTool == "Circle" then
            -- Menggambar lingkaran
            UserInputService.InputEnded:Wait()
            local endPoint = mouse.Hit.p
            local radius = (startPoint - endPoint).Magnitude
            drawCircle(startPoint, radius)
        elseif currentTool == "Pen" then
            -- Menggambar secara bebas
            local prevPoint = startPoint
            repeat
                local currentPoint = mouse.Hit.p
                drawFreehand(prevPoint, currentPoint)
                prevPoint = currentPoint
                wait()
            until not UserInputService:IsMouseButtonPressed(Enum.UserInputType.MouseButton1)
        elseif currentTool == "Eraser" then
            -- Menghapus
            UserInputService.InputEnded:Wait()
            local endPoint = mouse.Hit.p
            erase(startPoint, endPoint)
        end
    end
end)