From 91a22ac34a3e6dc8536298537796e101424a430c Mon Sep 17 00:00:00 2001
From: ubq323 <ubq323@ubq323.website>
Date: Tue, 31 Jan 2023 00:30:47 +0000
Subject: terrain data is sent from server to client

---
 common/chunk.lua | 33 +++++++++++++++++++++++++--------
 1 file changed, 25 insertions(+), 8 deletions(-)

(limited to 'common/chunk.lua')

diff --git a/common/chunk.lua b/common/chunk.lua
index 432e37b..e210387 100644
--- a/common/chunk.lua
+++ b/common/chunk.lua
@@ -1,17 +1,26 @@
+local json = require"common.dkjson"
+
 local CHUNK_SIZE = 128
 
 -- for now tiles shall be booleans
 
+local function index_ok(offq,offr)
+	return 0<=offq and 0<=offr and offq<CHUNK_SIZE and offr<CHUNK_SIZE
+end
+
 local function index(offq,offr)
 	-- indexes start at 0
 	-- and go up to (CHUNK_SIZE^2)-1
-	assert(0<=offq and 0<=offr and offq<CHUNK_SIZE and offr<CHUNK_SIZE, "chunk hex offset out of bounds")
-	return CHUNK_SIZE*offq + offr
+	assert(index_ok(offq,offr), "chunk hex offset out of bounds")
+	return CHUNK_SIZE*offq + offr + 1
 end
 
 local Chunk = {}
 Chunk.__index = Chunk
-function Chunk.make()
+function Chunk.make(tiles)
+	return setmetatable({tiles=tiles},Chunk)
+end
+function Chunk.gen()
 	-- todo actual worldgen
 	local tiles = {}
 	for i=0,CHUNK_SIZE-1 do
@@ -20,12 +29,20 @@ function Chunk.make()
 		end
 	end
 
-	return setmetatable({tiles=tiles},Chunk)
+	return Chunk.make(tiles)
+end
+function Chunk.at(self,hoffs)
+	if not index_ok(hoffs.q,hoffs.r) then return nil end
+	return self.tiles[index(hoffs.q,hoffs.r)]
+end
+
+function Chunk.data_packet(self)
+	return json.encode{t="chunk",tiles=self.tiles}
 end
-function Chunk.tile_at_offset(self,hoffs)
-	if not(0<=hoffs.q and 0<=hoffs.r and hoffs.q<CHUNK_SIZE and hoffs.r<CHUNK_SIZE) then return nil end
-	local idx = CHUNK_SIZE*hoffs.q + hoffs.r
-	return self.tiles[idx]
+function Chunk.from_packet_data(packet)
+	-- assuming packet has already been json.decoded
+	-- since otherwise how would we know it's a chunk packet
+	return Chunk.make(packet.tiles)
 end
 
 return {
-- 
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