What would be the best way to select all the parts behind a Gui Frame?

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1

Here’s a download if anyone is interested:
SelectionBoxLassoTool.rbxl (58.4 KB)

Code:

local ContextActionService = game:GetService('ContextActionService')
local RunService = game:GetService('RunService')

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()

local SelBox = script.Parent

local hold = false
local x1,y1,x2,y2 = 0,0,0,0

local function comeUpWithAnameForThisFunction(actionName, inputState, inputObj)
	if inputState == Enum.UserInputState.Begin then
		hold = true
		x1 = Mouse.X
		y1 = Mouse.Y
	elseif inputState == Enum.UserInputState.End then
		hold = false
	end
end

local function heartbeatConnection()
	if hold == true then
		SelBox.Visible = true

		x2 = Mouse.X
		y2 = Mouse.Y

		SelBox.Size = UDim2.new(0,(x2 - x1), 0, (y2 - y1))
		SelBox.Position = UDim2.new(0,x1,0,y1)
	else
		SelBox.Visible = false
	end
end

local connection = RunService.Heartbeat:Connect(heartbeatConnection)
ContextActionService:BindAction("someNameImNotCreative", comeUpWithAnameForThisFunction, false, Enum.UserInputType.MouseButton1)

wait(10) -- simulating as if I got a bindable event or something

ContextActionService:UnbindAction("someNameImNotCreative")
connection:Disconnect()
SelBox.Visible = false

My Questions:

  1. Can anything be simplified or be done more optimally?

  2. I need a function that sees what parts are currently behind the Gui Frame. Where would the function go? It has to go inside of the heartbeatConnection(), since I want it to constantly update and for the user to see what parts are currently being highlighted, and whether to adjust the Gui Frame’s size or not. I already have a selectPart(part) function and deselectPart(part) function, so I just need to loop through them. How would I even get the parts? I don’t think I can send out thousands of raycasts, one per pixel…

Thanks!

2

Project all 8 corners into the viewport (WorldToViewportPoint) and if any corners are inside select the part.

3

What do you mean? For every part in the workspace, create 8 corners, and for each of those corners check? That doesn’t sound like it’s gonna do well each heartbeat…

4

Won’t know unless you try. There’s ways to make it more efficient but don’t bother unless its actually too slow.

5

You probably don’t need to do it every heartbeat; just whenever the player resizes the lasso.

Thats all the advice I can give cause I don’t know some of this advanced stuff lol

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