From e5bb7ee1afa13a05139394da123036732791cbe6 Mon Sep 17 00:00:00 2001
From: MewMew <mail@mewmew.net>
Date: Tue, 18 Aug 2020 09:28:12 +0200
Subject: [PATCH] module

---
 modules/crawl_into_pipes.lua | 94 ++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 modules/crawl_into_pipes.lua

diff --git a/modules/crawl_into_pipes.lua b/modules/crawl_into_pipes.lua
new file mode 100644
index 00000000..ee4ac41f
--- /dev/null
+++ b/modules/crawl_into_pipes.lua
@@ -0,0 +1,94 @@
+--Your character may enter pipes.
+
+local Global = require 'utils.global'
+local Event = require 'utils.event'
+
+local math_floor = math.floor
+
+local pipe_crawl = {}
+Global.register(
+    pipe_crawl,
+    function(tbl)
+        pipe_crawl = tbl
+    end
+)
+
+local function get_current_pipe(player)
+	local position = {math_floor(player.position.x) + 0.5, math_floor(player.position.y) + 0.5}
+	local pipe = player.surface.find_entities_filtered({type = {"pipe", "pipe-to-ground"}, position = position, limit = 1})[1]
+	return pipe
+end
+
+local function is_pipe_end_piece(pipe)
+	local neighbours = pipe.neighbours[1]
+	if #neighbours == 1 then return true end
+end
+
+local function enter_pipe(player, pipe)
+	if not is_pipe_end_piece(pipe) then return end
+	
+	player.walking_state = {walking = false}
+	pipe_crawl[player.name].character = player.character.clone({position = {0,0}, surface = "crawl_into_pipes", force = player.force})
+	player.character.destroy()
+	player.set_controller({type = defines.controllers.god})
+end
+
+local function exit_pipe(player)
+	if player.character then return end	
+	local saved_character = pipe_crawl[player.name].character
+	player.character = saved_character.clone({position = player.position, surface = player.surface, force = player.force})	
+	saved_character.destroy()
+end
+--[[
+local function align_position_to_pipe(player, pipe)
+	local position = player.position
+	local tile_position = {x = math_floor(position.x), y = math_floor(position.y)}
+	local inside_position = {x = position.x - tile_position.x, y = position.y - tile_position.y}
+
+end
+]]
+local function on_player_changed_position(event)
+	local player = game.players[event.player_index]
+	local pipe = get_current_pipe(player)
+	if not pipe then 
+		exit_pipe(player) 
+		return 
+	end
+	--[[
+	if not player.character then 
+		align_position_to_pipe(player, pipe)
+		return 
+	end
+	]]
+	if not player.character.valid then return end
+	if player.character.driving then return end
+	
+	enter_pipe(player, pipe)
+end
+
+local function on_player_joined_game(event)
+	local player = game.players[event.player_index]
+	if not pipe_crawl[player.name] then pipe_crawl[player.name] = {} end
+end
+
+local function on_init()
+	pipe_crawl.players = {}
+
+	game.create_surface(
+		"crawl_into_pipes",
+		{
+			height = 3,
+			width = 3,
+			["default_enable_all_autoplace_controls"] = false,
+			["autoplace_settings"] = {
+				["entity"] = {treat_missing_as_default = false},
+				["tile"] = {treat_missing_as_default = false},
+				["decorative"] = {treat_missing_as_default = false},
+			},
+		}
+	)
+end
+
+Event.on_init(on_init)
+Event.add(defines.events.on_player_changed_position, on_player_changed_position)
+Event.add(defines.events.on_player_joined_game, on_player_joined_game)
\ No newline at end of file