From b5484fc37c1f93654f95f21483d52229a34e6330 Mon Sep 17 00:00:00 2001
From: ubq323 <ubq323@ubq323.website>
Date: Tue, 24 Jan 2023 03:20:44 +0000
Subject: things

---
 client/common     |   1 +
 client/conf.lua   |   3 ++
 client/main.lua   | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 common/words.lua  |  17 ++++++++
 server/common     |   1 +
 server/server.lua | 111 +++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 255 insertions(+)
 create mode 120000 client/common
 create mode 100644 client/conf.lua
 create mode 100644 client/main.lua
 create mode 100644 common/words.lua
 create mode 120000 server/common
 create mode 100644 server/server.lua

diff --git a/client/common b/client/common
new file mode 120000
index 0000000..60d3b0a
--- /dev/null
+++ b/client/common
@@ -0,0 +1 @@
+../common
\ No newline at end of file
diff --git a/client/conf.lua b/client/conf.lua
new file mode 100644
index 0000000..5c58cb3
--- /dev/null
+++ b/client/conf.lua
@@ -0,0 +1,3 @@
+function love.conf(t)
+	t.window.title = "rectangle emulator"
+end
diff --git a/client/main.lua b/client/main.lua
new file mode 100644
index 0000000..4375ed3
--- /dev/null
+++ b/client/main.lua
@@ -0,0 +1,122 @@
+local enet = require"enet"
+local words = require"common.words"
+
+
+local PLAYER_SIZE = 30
+
+local local_player = false
+
+-- {
+-- 	pos={100,100},
+-- 	color={love.math.colorFromBytes(0xdf,0x73,0xff)},
+-- }
+
+local host,peer
+
+local function draw_player(pl,me)
+	local hplsz = PLAYER_SIZE/2
+	love.graphics.setColor(pl.color)
+	love.graphics.rectangle("fill",pl.pos[1]-hplsz,pl.pos[2]-hplsz,PLAYER_SIZE,PLAYER_SIZE)
+	love.graphics.setColor(0,0,0)
+	love.graphics.print(tostring(pl.id),pl.pos[1],pl.pos[2])
+	if me then
+		love.graphics.setColor(1,1,1)
+		love.graphics.rectangle("line",pl.pos[1]-hplsz,pl.pos[2]-hplsz,PLAYER_SIZE,PLAYER_SIZE)
+	end
+end
+
+local remote_players = {}
+
+local function update_local_player(pl,dt)
+	local SPEED = 300 -- pixels/sec
+	local function kd(code)
+		if love.keyboard.isScancodeDown(code) then return 1 else return 0 end
+	end
+	local dx = kd"d"-kd"a"
+	local dy = kd"s"-kd"w"
+
+	if dx == 0 and dy == 0 then
+		pl.pos_dirty = false
+		return
+	end
+
+	if dx ~= 0 and dy ~= 0 then
+		dx = dx / math.sqrt(2)
+		dy = dy / math.sqrt(2)
+	end
+
+	pl.pos[1] = pl.pos[1] + SPEED * dt * dx
+	pl.pos[2] = pl.pos[2] + SPEED * dt * dy
+	pl.pos_dirty = true
+end
+
+local function sync_local_player(pl,peer)
+	-- send updated info about local player to server
+	if pl.pos_dirty then
+		peer:send(words.join("ppos",pl.pos[1],pl.pos[2]))
+	end
+end
+
+function love.update(dt)
+	if local_player then
+		update_local_player(local_player,dt)
+		sync_local_player(local_player,peer)
+	end
+	repeat
+		local ev = host:service()
+		if ev and ev.type == "receive" then
+			local w = words.split(ev.data)
+			local op = w[1]
+			if op == "join" then
+				local id,x,y,r,g,b = unpack(w,2)
+				-- blegh
+				id=tonumber(id)
+				x=tonumber(x)
+				y=tonumber(y)
+				r=tonumber(r)
+				g=tonumber(g)
+				b=tonumber(b)
+				remote_players[id] = {pos={x,y},color={r,g,b},id=id}
+			elseif op == "leave" then
+				local id = tonumber(w[2])
+				remote_players[id]=nil
+			elseif op == "move" then
+				local id,x,y = unpack(w,2)
+				id=tonumber(id)
+				x=tonumber(x)
+				y=tonumber(y)
+				assert(remote_players[id],"wheeze")
+				remote_players[id].pos[1] = x
+				remote_players[id].pos[2] = y
+			elseif op == "you" then
+				local id,x,y,r,g,b = unpack(w,2)
+				id=tonumber(id)
+				x=tonumber(x)
+				y=tonumber(y)
+				r=tonumber(r)
+				g=tonumber(g)
+				b=tonumber(b)
+				local_player = {pos={x,y},color={r,g,b},id=id}
+			end
+		end
+	until not ev
+end
+
+function love.draw()
+	if local_player then
+		draw_player(local_player,true)
+	end
+	for _,pl in pairs(remote_players) do
+		draw_player(pl)
+	end
+end
+
+function love.load()
+	host = enet.host_create()
+	peer = host:connect("localhost:8473")
+end
+
+function love.quit()
+	peer:disconnect()
+	host:flush()
+end
diff --git a/common/words.lua b/common/words.lua
new file mode 100644
index 0000000..4d6904e
--- /dev/null
+++ b/common/words.lua
@@ -0,0 +1,17 @@
+local function join(...)
+	return table.concat({...}," ")
+end
+
+local function split(s)
+	local o = {}
+	for w in string.gmatch(s,"(%S+)") do
+		table.insert(o,w)
+	end
+	return o
+end
+
+return {
+	join=join,
+	split=split,
+}
+	
diff --git a/server/common b/server/common
new file mode 120000
index 0000000..60d3b0a
--- /dev/null
+++ b/server/common
@@ -0,0 +1 @@
+../common
\ No newline at end of file
diff --git a/server/server.lua b/server/server.lua
new file mode 100644
index 0000000..4db0207
--- /dev/null
+++ b/server/server.lua
@@ -0,0 +1,111 @@
+local enet = require"enet"
+local words = require"common.words"
+local unpack = unpack or table.unpack
+
+math.randomseed(os.time())
+
+local host = enet.host_create("*:8473")
+print(host)
+
+-- sequential list of all players
+local playerlist = {}
+
+-- this is maybe suboptimal
+-- but it is simplest for now
+local function player_by_id(id)
+	for i,pl in ipairs(playerlist) do
+		if pl.id == id then return pl, i end
+	end
+	return nil
+end
+local function player_by_peer(peer)
+	for i,pl in ipairs(playerlist) do
+		if pl.peer == peer then return pl, i end
+	end
+	return nil
+end
+
+
+local function gen_id()
+	local x = math.random(100000)
+	-- if players[x] then error("cough") end
+	return x
+end
+local function random_color()
+	return {math.random(),math.random(),math.random()}
+end
+local function make_player(peer)
+	return {pos={100,100},color=random_color(),peer=peer}
+end
+
+-- maybe json could be used for this
+-- or something
+local function player_info_part(player)
+	return words.join(
+		player.id,
+		player.pos[1],
+		player.pos[2],
+		player.color[1],
+		player.color[2],
+		player.color[3])
+end
+local function player_join_packet(player)
+	return "join "..player_info_part(player)
+end
+local function player_you_packet(player)
+	return "you "..player_info_part(player)
+end
+local function player_leave_packet(player)
+	return words.join("leave",player.id)
+end
+local function player_move_packet(player,x,y)
+	return words.join("move",player.id,x,y)
+end
+
+while true do
+	local ev = host:service(100)
+	if ev then
+		if ev.type == "connect" then
+			local player = make_player(ev.peer)
+			table.insert(playerlist,player)
+			player.id = #playerlist
+			print("connect",player.peer,player.id)
+			player.peer:send(player_you_packet(player))
+
+			for i,otherplayer in ipairs(playerlist) do
+				if otherplayer ~= player then
+					-- tell new player about each other player
+					player.peer:send(player_join_packet(otherplayer))
+					-- tell each other player about new player
+					otherplayer.peer:send(player_join_packet(player))
+				end
+			end
+		elseif ev.type == "disconnect" then
+			local player, idx = player_by_peer(ev.peer)
+			if not player then error("sneeze "..ev.peer) end
+			table.remove(playerlist,idx)
+			for i,otherplayer in ipairs(playerlist) do
+				otherplayer.peer:send(player_leave_packet(player))
+			end
+		elseif ev.type == "receive" then
+			local player = player_by_peer(ev.peer)
+			if not player then error("sneezey "..ev.peer) end
+			local w = words.split(ev.data)
+			local op = w[1]
+			if op == "ppos" then
+				local _,x,y,a = unpack(w)
+				player.pos[1] = tonumber(x)
+				player.pos[2] = tonumber(y)
+				print(player.id,"-->",player.pos[1],player.pos[2])
+				for i,otherplayer in ipairs(playerlist) do
+					if otherplayer ~= player then
+						otherplayer.peer:send(player_move_packet(player,x,y))
+					end
+				end
+			end
+
+		end
+		-- for k,v in pairs(ev) do io.write(tostring(k),":",tostring(v)," ") end
+		-- print()
+	end
+end
-- 
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