Coins on Screen

Lesson 5 of 18 in Coddy's Roblox Game: Pet Simulator course.

Now the client. PetClient is a LocalScript inside the HUD, a ScreenGui that Roblox copies from StarterGui into each player's screen when they spawn. A LocalScript runs on that player's own device, and it can name the player it runs for:

local me = game:GetService("Players").LocalPlayer

The server puts leaderstats into the player a moment after they join, so the client waits for it with WaitForChild. Then it shows the coins in the HUD's Coins label and again every time they change: an IntValue's Changed fires with the new value.

The label only shows what the server decided. Changing Coins.Value in a LocalScript would change this player's view of it and nothing on the server.

Challenge

Medium

In PetClient:

Get Players, local me = Players.LocalPlayer and local hud = script.Parent.
Wait for leaderstats and its Coins.
Write showCoins(), which sets hud.Coins.Text to Coins: 5 (the value), call it once, and connect it to Coins.Changed.

Press Play and break a pile. Then Check.

Try it yourself

local Players = game:GetService("Players")
local ServerStorage = game:GetService("ServerStorage")
local Settings = require(game.ReplicatedStorage.Settings)

local piles = workspace.Piles
local pileSpot = {} -- each pile -> the spot it stands on

print("A Meadow pile gives " .. Settings.PileValue .. " coins")

-- Every player gets Coins on the leaderboard
Players.PlayerAdded:Connect(function(player)
	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	leaderstats.Parent = player

	local coins = Instance.new("IntValue")
	coins.Name = "Coins"
	coins.Parent = leaderstats
end)

-- A pile's click needs hitPile, which is written below spawnPile: name it
-- here, before either
local hitPile

-- A coin pile on a spot: a copy of ServerStorage.CoinPile with its health
-- and value as attributes
local function spawnPile(spot)
	local pile = ServerStorage.CoinPile:Clone()
	pile.Position = spot.Position
	pile:SetAttribute("MaxHealth", Settings.PileHealth)
	pile:SetAttribute("Health", Settings.PileHealth)
	pile:SetAttribute("Value", Settings.PileValue)
	-- click it to hit it
	local detector = Instance.new("ClickDetector")
	detector.Parent = pile
	pileSpot[pile] = spot
	pile.Parent = piles
	detector.MouseClick:Connect(function(player)
		hitPile(player, pile)
	end)
	return pile
end

-- A hit takes 1 off a pile's health;
-- at 0 the pile breaks and pays its value
function hitPile(player, pile)
	local health = pile:GetAttribute("Health") - 1
	if health > 0 then
		pile:SetAttribute("Health", health)
		return
	end
	player.leaderstats.Coins.Value += pile:GetAttribute("Value")
	local spot = pileSpot[pile]
	pileSpot[pile] = nil
	pile:Destroy()
	-- a new pile on the same spot, a few seconds later
	task.delay(Settings.RespawnTime, spawnPile, spot)
end

-- A pile on every spot in the Meadow
for _, spot in workspace.Zones.Meadow.Spawns:GetChildren() do
	spawnPile(spot)
end