Player Targeting UI

This project will demonstrate how to use a LifeSensor along with a screen to display a targetting UI with player selection and a big red fire button.

local screen = assert(Network:GetPart("Screen"), "expected screen to be connected")
local canvas = screen:GetCanvas("2D")

local lifeSensor = assert(Network:GetPart("LifeSensor"), "expected life sensor to be connected")
local gyro = assert(Network:GetPart("Gyro"), "expected gyro to be connected")
local guns = Network:GetParts("Gun")

local scrollingFrame
local targetDisplay
local playerElements = {}

local function fireWeapons()
	for _, gun in guns do
		gun:Trigger()
	end
end

local function updateInterface()
	local players = lifeSensor:GetReading()

	-- update player list
	local index = 0
	for player, _ in pairs(players) do
		if not playerElements[player] then
			local element = Instance.new("TextButton")
			element.Size = UDim2.fromScale(1, 0.05)
			element.Position = UDim2.fromScale(0.0, index * 0.05)
			element.Text = player

			element.MouseButton1Click:Connect(function()
				-- on click, set gyro target
				gyro.Seek = player
				targetDisplay.Text = player
			end)

			playerElements[player] = element

			element.Parent = scrollingFrame
		end

		index += 1
	end

	index = 0
	for player, element in pairs(playerElements) do
		-- this player left, destroy their corresponding UI element
		if not players[player] then
			playerElements[player]:Destroy()
			playerElements[player] = nil
			continue
		end

		element.Position = UDim2.fromScale(0.0, index * 0.05)
		index += 1
	end

	return players
end

do -- construct the ui
	local frame = Instance.new("Frame")
	frame.Size = UDim2.fromScale(1, 1)
	frame.BackgroundColor3 = Color3.fromRGB(50, 50, 50)
	frame.Parent = canvas

	scrollingFrame = Instance.new("ScrollingFrame")
	scrollingFrame.Size = UDim2.fromScale(0.5, 1)
	scrollingFrame.Parent = frame

	targetDisplay = Instance.new("TextLabel")
	targetDisplay.Size = UDim2.fromScale(0.5, 0.1)
	targetDisplay.Position = UDim2.fromScale(0.5, 0.0)
	targetDisplay.Text = "nil"
	targetDisplay.Parent = frame

	local fireButton = Instance.new("TextButton")
	fireButton.Size = UDim2.fromScale(0.5, 0.2)
	fireButton.Position = UDim2.fromScale(0.5, 0.8)
	fireButton.BackgroundColor3 = Color3.fromRGB(255, 0, 0)
	fireButton.Text = "Fire"
	fireButton.Parent = frame

	fireButton.MouseButton1Click:Connect(fireWeapons)
end

while true do
	updateInterface()
	task.wait(1)
end

Model code:

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