Merge pull request #460 from bbassie/feature/scenario-spectate

Move spectate into exp_scenario

exp_scenario/module/commands/spectate.lua

@@ -3,7 +3,7 @@ Adds commands relating to spectate and follow
 ]]
 
 local Commands = require("modules/exp_commands")
-local Spectate = require("modules.exp_legacy.modules.control.spectate") --- @dep modules.control.spectate
+local Spectate = require("modules/exp_scenario/control/spectate")
 
 --- Toggles spectator mode for the caller
 Commands.new("spectate", { "exp-commands_spectate.description-spectate" })

exp_scenario/module/control.lua

@@ -66,6 +66,7 @@ add(require("modules/exp_scenario/control/report_jail"))
 add(require("modules/exp_scenario/control/research"))
 add(require("modules/exp_scenario/control/roles"))
 add(require("modules/exp_scenario/control/spawn_area"))
+add(require("modules/exp_scenario/control/spectate"))
 add(require("modules/exp_scenario/control/station_auto_name"))
 
 --- Guis

exp_scenario/module/control/spectate.lua

@@ -0,0 +1,181 @@
+--[[-- Control - Spectate
+Lets players spectate without losing their character, and follow other players or entities
+]]
+
+local Storage = require("modules/exp_util/storage")
+local Gui = require("modules/exp_gui")
+
+--- @class ExpScenario_Spectate
+local Spectate = {
+    --- @package
+    events = {},
+}
+
+--- @class ExpScenario_Spectate.Following
+--- @field player LuaPlayer
+--- @field target LuaPlayer | LuaEntity
+--- @field position MapPosition Where the player was after the last update, moving away stops following
+--- @field started_spectate boolean True when start_follow put the player into spectator mode
+--- @field stop boolean? Set when following must end on the next tick
+
+local following = {} --- @type table<uint, ExpScenario_Spectate.Following> Keyed by player index
+local spectating = {} --- @type table<uint, LuaEntity> The character a player returns to, keyed by player index
+
+Storage.register({
+    following = following,
+    spectating = spectating,
+}, function(tbl)
+    following = tbl.following
+    spectating = tbl.spectating
+end)
+
+--- Label shown while following, clicking it or pressing escape stops following
+--- @class ExpScenario_Spectate.follow_label: ExpElement
+--- @overload fun(parent: LuaGuiElement, target: LuaPlayer | LuaEntity): LuaGuiElement
+local follow_label = Gui.define("spectate/follow_label")
+    :draw(function(_, parent, target)
+        Gui.destroy_if_valid(parent.follow_label)
+
+        local label = parent.add{
+            type = "label",
+            name = "follow_label",
+            style = "frame_title",
+            caption = { "exp_spectate.follow-label", target.name },
+        }
+
+        local player = Gui.get_player(parent)
+        local res = player.display_resolution
+        label.location = { 0, res.height - 150 }
+        label.style.width = res.width
+        label.style.horizontal_align = "center"
+        player.opened = label
+
+        return label
+    end)
+    :on_click(function(_, player)
+        Spectate.stop_follow(player)
+    end)
+    :on_closed(function(_, player)
+        -- set_controller can not be called during on_gui_closed, so the next update stops following
+        local data = following[player.index]
+        if data then data.stop = true end
+    end) --[[@as any]]
+
+--- Check if a player is in spectator mode
+--- @param player LuaPlayer
+--- @return boolean
+function Spectate.is_spectating(player)
+    return player.controller_type == defines.controllers.spectator
+end
+
+--- Put a player into spectator mode while keeping their character
+--- @param player LuaPlayer
+--- @return boolean # False when the player was already spectating or has no character
+function Spectate.start_spectate(player)
+    if spectating[player.index] or not player.character then return false end
+    local character = player.character
+    local opened = player.opened
+
+    player.set_controller{ type = defines.controllers.spectator }
+    player.associate_character(character)
+    spectating[player.index] = character
+
+    if opened then player.opened = opened end -- Changing controller closes the opened gui
+
+    return true
+end
+
+--- Return a player to their character, or respawn them if it was killed
+--- @param player LuaPlayer
+function Spectate.stop_spectate(player)
+    local character = spectating[player.index]
+    spectating[player.index] = nil
+
+    if character and character.valid then
+        local opened = player.opened
+        player.teleport(character.position, character.surface)
+        player.set_controller{ type = defines.controllers.character, character = character }
+        if opened then player.opened = opened end -- Changing controller closes the opened gui
+    else
+        player.ticks_to_respawn = 300
+    end
+end
+
+--- Check if a player is following something
+--- @param player LuaPlayer
+--- @return boolean
+function Spectate.is_following(player)
+    return following[player.index] ~= nil
+end
+
+--- Put a player into spectator mode and keep their camera on a target as it moves
+--- @param player LuaPlayer
+--- @param target LuaPlayer | LuaEntity
+function Spectate.start_follow(player, target)
+    local started_spectate = Spectate.start_spectate(player)
+
+    follow_label(player.gui.screen, target)
+    player.teleport(target.position, target.surface)
+    following[player.index] = {
+        player = player,
+        target = target,
+        position = player.position,
+        started_spectate = started_spectate,
+    }
+end
+
+--- Give a player their camera back, returning them to their character if start_follow took it
+--- @param player LuaPlayer
+function Spectate.stop_follow(player)
+    local data = following[player.index]
+    if data and data.started_spectate and Spectate.is_spectating(player) then
+        Spectate.stop_spectate(player)
+    end
+
+    Gui.destroy_if_valid(player.gui.screen.follow_label)
+    following[player.index] = nil
+end
+
+--- Move a following player onto their target, or stop following when they have moved away or regained a character
+--- @param data ExpScenario_Spectate.Following
+local function update_following(data)
+    local player, target = data.player, data.target
+    local position = player.position
+    if
+        data.stop
+        or player.character
+        or not target.valid
+        or position.x ~= data.position.x
+        or position.y ~= data.position.y
+    then
+        Spectate.stop_follow(player)
+    else
+        player.teleport(target.position, target.surface)
+        data.position = player.position
+    end
+end
+
+local function on_tick()
+    for _, data in pairs(following) do
+        update_following(data)
+    end
+end
+
+--- Stop following when a player leaves, and stop anyone who was following them
+--- @param event EventData.on_pre_player_left_game
+local function on_pre_player_left_game(event)
+    local player = game.players[event.player_index]
+    Spectate.stop_follow(player)
+    for _, data in pairs(following) do
+        if data.target == player then
+            Spectate.stop_follow(data.player)
+        end
+    end
+end
+
+local e = defines.events
+
+Spectate.events[e.on_tick] = on_tick
+Spectate.events[e.on_pre_player_left_game] = on_pre_player_left_game
+
+return Spectate

exp_scenario/module/locale/en.cfg

@@ -577,3 +577,6 @@ chat-jailed=__1__ was jailed because they removed too many protected entities. P
 
 [exp_report-jail]
 chat-jailed=__1__ was jailed because they were reported too many times. Please wait for a moderator.
+
+[exp_spectate]
+follow-label=Following __1__.\nClick here or press escape to stop following.