Rising Flood

Lesson 10 of 18 in Coddy's Roblox Game: Disaster Survival course.

Time for the first disaster. The game will have several, so they go in one table, each a function that takes the map. A function stored in a table is called like any other:

local Disasters = {}

function Disasters.Flood(map)
	-- make the water and raise it
end

Disasters.Flood(map)

The flood is a wide blue part that starts under the island and rises, but not to the top: the rocks on the Island and the roofs on Rooftops stay dry, so a player who climbs in time survives. A disaster nobody can survive is no game. TweenService changes a property smoothly over time: describe how long with a TweenInfo, give the goal values, and Play it.

local rise = TweenInfo.new(12, Enum.EasingStyle.Linear)
TweenService:Create(water, rise, { Position = water.Position + Vector3.new(0, 8, 0) }):Play()

The water must not hold players up, so CanCollide is false and it stays Anchored. Defeating whoever touches it is the same job lava did in the first course; this game gives it a name, defeat(hit), because every disaster will use it.

Parent the water to the map, so destroying the map at the end of the round takes the water with it.

Challenge

Medium

Add the flood:

Get TweenService at the top.
Write defeat(hit): if hit.Parent has a Humanoid, set its Health to 0.
Make local Disasters = {} and function Disasters.Flood(map): a part named Water in the map, anchored, not CanCollide, blue and see-through (Transparency 0.3), 10 studs wider than map.Base each way, starting 2 studs below it. Touching it defeats. Tween its Position 8 studs up over Settings.RoundLength * 0.8 seconds, at a steady pace (Enum.EasingStyle.Linear), so it stops below the tops of the rocks.
Call Disasters.Flood(map) right after the players are teleported.

Press Play and race the tide: jump up the rocks to the left of the spawn. Then Check.

Try it yourself

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

local lobbySpawn = workspace.LobbySpawn

print("Rounds last " .. Settings.RoundLength .. " seconds")

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

	local wins = Instance.new("IntValue")
	wins.Name = "Wins"
	wins.Parent = leaderstats
end)

-- The status board in the lobby
local gui = Instance.new("SurfaceGui")
gui.Parent = workspace.StatusBoard

local status = Instance.new("TextLabel")
status.Name = "Status"
status.Size = UDim2.fromScale(1, 1)
status.BackgroundColor3 = Color3.fromRGB(25, 25, 35)
status.TextColor3 = Color3.fromRGB(255, 255, 255)
status.TextScaled = true
status.Text = "Welcome to Disaster Survival!"
status.Parent = gui

local function setStatus(text)
	status.Text = text
end

local function teleport(player, target)
	local character = player.Character
	if character then
		character:PivotTo(target.CFrame + Vector3.new(0, 4, 0))
	end
end

-- The round loop
while true do
	for seconds = Settings.Intermission, 1, -1 do
		setStatus("Intermission: " .. seconds)
		task.wait(1)
	end

	local map = ServerStorage.Maps.Island:Clone()
	map.Name = "Map"
	map.Parent = workspace

	local survivors = {}
	for _, player in Players:GetPlayers() do
		local character = player.Character
		if character and character.Humanoid.Health > 0 then
			teleport(player, map.Spawn)
			survivors[player] = true
			character.Humanoid.Died:Connect(function()
				survivors[player] = nil
			end)
		end
	end

	for seconds = Settings.RoundLength, 1, -1 do
		setStatus("Time left: " .. seconds)
		task.wait(1)
	end

	local names = {}
	for player in survivors do
		player.leaderstats.Wins.Value += 1
		teleport(player, lobbySpawn)
		table.insert(names, player.Name)
	end
	map:Destroy()
	if #names > 0 then
		setStatus("Winners: " .. table.concat(names, ", "))
	else
		setStatus("Nobody survived!")
	end
	task.wait(3)
end