Initial

5 files changed, 1117 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3c3629e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules
diff --git a/capturego_server.js b/capturego_server.js
new file mode 100755
index 0000000..b5d938e
--- /dev/null
+++ b/capturego_server.js
@@ -0,0 +1,176 @@
+#!/usr/bin/env node
+
+const naampje=require("naampje");
+
+const PORT=8080;
+
+// Game: {id: Int, size: Int, board: Board, onturn: Int, players: [Player]}
+//   'onturn' is index into 'players', or -1 if game is finished
+// Player: {id: Int, name: String, socket: SocketIO_Socket, games: [Game]}
+// Board: [(0,1,-1) * (size*size)]
+const games=new Map();  // game_id => Game
+const players=new Map();  // player_id => Player
+
+{let id=0; function uniqid(){return id++;}}
+
+function mkPlayer(socket){
+	const id=uniqid();
+	let name;
+	while(true){try {name=naampje.name();} catch(e){continue;} break;}
+	return {id, name, socket, games: []};
+}
+
+function mkGame(size,players){
+	const id=uniqid();
+	const board=new Array(size*size).fill(0);
+	return {id, size, board, onturn: 0, players};
+}
+
+function safePlayer(p){
+	return {id: p.id, name: p.name, games: p.games.map(g=>g.id)};
+}
+
+function safeGame(g){
+	return {id: g.id, size: g.size, board: g.board, onturn: g.onturn, players: g.players.map(safePlayer)};
+}
+
+function playerLeavesGame(player,game){
+	game.onturn=-1;
+	const newp=[];
+	for(const p of game.players){
+		if(p!=player){
+			p.socket.emit("game_leave",safeGame(game),safePlayer(player));
+			newp.push(p);
+		}
+	}
+	if(newp.length==0)games.delete(game.id);
+	else game.players=newp;
+}
+
+// Returns winning player (0 or 1) or -1 if none yet
+function gameBoardFinished(game){
+	const B=game.board,S=game.size;
+	for(let i=0;i<S*S;i++){
+		if(B[i]==0)continue;
+		const flags=new Array(S*S).fill(false);
+		const queue=[i];
+		let nb0=false;
+		while(queue.length){
+			const at=queue.shift(),x=at%S,y=~~(at/S);
+			flags[at]=true;
+			if(x>0&&!flags[at-1]){if(B[at-1]==B[i])queue.push(at-1); else if(B[at-1]==0){nb0=true; break;}}
+			if(y>0&&!flags[at-S]){if(B[at-S]==B[i])queue.push(at-S); else if(B[at-S]==0){nb0=true; break;}}
+			if(x<S-1&&!flags[at+1]){if(B[at+1]==B[i])queue.push(at+1); else if(B[at+1]==0){nb0=true; break;}}
+			if(y<S-1&&!flags[at+S]){if(B[at+S]==B[i])queue.push(at+S); else if(B[at+S]==0){nb0=true; break;}}
+		}
+		if(!nb0)return 1-B[i]==1?1:0;
+	}
+	return -1;
+}
+
+
+const app=require("express")();
+const httpServer=require("http").Server(app);
+const io=require("socket.io")(httpServer);
+httpServer.listen(PORT,()=>console.log(`Listening on port ${PORT}`));
+
+
+app.get("/",(req,res)=>{
+	res.sendFile(__dirname+"/index.html");
+});
+
+io.on("connection",(socket)=>{
+	const player=mkPlayer(socket);
+	console.log(`connect ${player.id}`);
+	players.set(player.id,player);
+	for(const p of players.values()){
+		if(p!=player)p.socket.emit("player_list_change");
+	}
+
+	socket.on("my_info",(cb)=>{
+		if(typeof cb!="function")return;
+		cb(safePlayer(player));
+	});
+
+	socket.on("player_info",(pi,cb)=>{
+		if(typeof cb!="function")return;
+		const p=players.get(pi);
+		if(!p)cb(null);
+		else cb(safePlayer(p));
+	});
+
+	socket.on("list_players",(cb)=>{
+		if(typeof cb!="function")return;
+		const l=[];
+		for(const p of players.values()){
+			l.push(safePlayer(p));
+		}
+		cb(l);
+	});
+
+	socket.on("disconnect",()=>{
+		console.log(`disconnect ${player.id}`);
+		for(const g of player.games)playerLeavesGame(player,g);
+		players.delete(player.id);
+		for(const p of players.values()){
+			p.socket.emit("player_list_change");
+		}
+	});
+
+	socket.on("create_game",(otherid,size)=>{
+		const otherp=players.get(+otherid);
+		if(!otherp){
+			socket.emit("err",`Player with id ${otherid} not found`);
+			return;
+		}
+		if(typeof size!="number"||isNaN(size)||size<5||size>99||size%1!=0)return;
+
+		const arr=Math.random()<0.5?[player,otherp]:[otherp,player];
+		const game=mkGame(size,arr);
+		player.games.push(game);
+		otherp.games.push(game);
+		games.set(game.id,game);
+
+		for(const p of game.players){
+			p.socket.emit("game_create",safeGame(game));
+		}
+		game.players[0].socket.emit("game_turn",safeGame(game));
+		game.players[1].socket.emit("game_other_turn",safeGame(game));
+	});
+
+	socket.on("leave_game",(gi)=>{
+		const g=games.get(gi);
+		if(!g)return;
+		if(player.games.indexOf(g)==-1)return;
+		playerLeavesGame(player,g);
+	});
+
+	socket.on("game_move",(gi,idx)=>{
+		const g=games.get(gi);
+		if(!g)return;
+		if(player.games.indexOf(g)==-1)return;
+		if(typeof idx!="number"||isNaN(idx)||idx<0||idx>=g.size*g.size||idx%1!=0){
+			socket.emit("err","Invalid position sent");
+			return;
+		}
+		if(g.players[g.onturn]!=player){
+			socket.emit("err","Not on turn");
+			return;
+		}
+		if(g.board[idx]!=0){
+			socket.emit("err","Position already taken");
+			return;
+		}
+		g.board[idx]=[1,-1][g.onturn];
+		const win=gameBoardFinished(g)
+		if(win!=-1){
+			for(const p of g.players){
+				p.socket.emit("game_win",safeGame(g),safePlayer(g.players[win]));
+			}
+		} else {
+			g.onturn=1-g.onturn;
+			g.players[g.onturn].socket.emit("game_turn",safeGame(g));
+			g.players[1-g.onturn].socket.emit("game_other_turn",safeGame(g));
+		}
+	});
+});
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..8624e20
--- /dev/null
+++ b/index.html
@@ -0,0 +1,302 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CaptureGo</title>
+<script src="/socket.io/socket.io.js"></script>
+<script>
+var CELL_WID=25,STONE_SIZE=0.4*CELL_WID;
+
+var cvs=null,ctx=null;
+var myId=null,myName=null;
+var currentGame=null,currentOther=null,winningPlayer=null;
+var GS_WAIT=0,GS_TURN=1,GS_FINISH=2;
+var gameState=GS_WAIT;
+const socket=io();
+
+function setStatus(str){
+	document.getElementById("status").innerHTML=str;
+}
+
+function setGameStatus(str){
+	document.getElementById("game_status").innerHTML=str;
+}
+
+function interfaceSwitch(cont){
+	document.getElementById("cont_connect").classList.add("invisible");
+	document.getElementById("cont_game").classList.add("invisible");
+	document.getElementById("cont_"+cont).classList.remove("invisible");
+}
+
+function getPlayersList(){
+	socket.emit("list_players",function(list){
+		var sel=document.getElementById("other_player_select");
+		sel.innerHTML="";
+		for(var i=0;i<list.length;i++){
+			if(list[i].id==myId)continue;
+			var option=document.createElement("option");
+			option.value=list[i].id;
+			option.appendChild(document.createTextNode(list[i].name));
+			sel.appendChild(option);
+		}
+	});
+}
+
+function initConnect(){
+	setStatus("Connecting...");
+
+	socket.on("connect",function(){
+		socket.emit("my_info",function(p){
+			myId=p.id; myName=p.name;
+			document.getElementById("info").innerHTML="ID: "+myId+"<br>Name: "+myName;
+			setStatus("Connected.");
+			interfaceSwitch("connect");
+			getPlayersList();
+		});
+	});
+
+	socket.on("disconnect",function(){
+		location.href=location.href;
+	});
+
+	socket.on("err",function(err){
+		alert(err);
+	});
+
+	socket.on("player_list_change",getPlayersList);
+
+	socket.on("game_create",function(game){
+		if(currentGame){
+			socket.emit("leave_game",game.id);
+			return;
+		}
+		currentGame=game;
+		if(game.players[0].id==myId)currentOther=game.players[1];
+		else currentOther=game.players[0];
+		interfaceSwitch("game");
+		document.getElementById("game_header").innerHTML="Game with "+currentOther.name;
+		setGameStatus("Preparing");
+		var colourString=game.players[0].id==myId?"black":"white";
+		document.getElementById("colour_note").innerHTML="You are playing "+colourString+".";
+		winningPlayer=null;
+		redrawBoard();
+	});
+
+	socket.on("game_leave",function(g,p){
+		if(g.id!=currentGame.id)return;
+		currentGame=g;
+		socket.emit("leave_game",g.id);
+		interfaceGameState(GS_FINISH);
+	});
+
+	socket.on("game_turn",function(g){
+		if(g.id!=currentGame.id)return;
+		currentGame=g;
+		redrawBoard();
+		interfaceGameState(GS_TURN);
+	});
+
+	socket.on("game_other_turn",function(g){
+		if(g.id!=currentGame.id)return;
+		currentGame=g;
+		redrawBoard();
+		interfaceGameState(GS_WAIT);
+	});
+
+	socket.on("game_win",function(g,p){
+		if(g.id!=currentGame.id)return;
+		currentGame=g;
+		winningPlayer=p;
+		redrawBoard();
+		interfaceGameState(GS_FINISH);
+	});
+}
+
+function boardX(idx){
+	return (~~(idx%currentGame.size)+0.5)*CELL_WID;
+}
+
+function boardY(idx){
+	return (~~(idx/currentGame.size)+0.5)*CELL_WID;
+}
+
+function redrawBoard(){
+	if(currentGame==null){
+		interfaceSwitch("connect");
+		return;
+	}
+
+	var G=currentGame;
+	var bsz=G.size*CELL_WID;
+
+	if(cvs.width!=bsz||cvs.height!=bsz){cvs.width=bsz; cvs.height=bsz;}
+
+	ctx.fillStyle="rgb(224,177,92)";
+	ctx.fillRect(0,0,cvs.width,cvs.height);
+	ctx.strokeStyle="rgb(0,0,0)";
+	ctx.beginPath();
+	for(var i=0;i<G.size;i++){
+		ctx.moveTo(boardX(i),boardY(0));
+		ctx.lineTo(boardX(i),boardY(G.size*G.size-1));
+		ctx.moveTo(boardX(0),boardY(G.size*i));
+		ctx.lineTo(boardX(G.size*G.size-1),boardY(G.size*i));
+	}
+	ctx.stroke();
+
+	var dots=[];
+	if(G.size==9)dots=[2*9+2,6*9+2,2*9+6,6*9+6];
+	if(G.size==13)dots=[3*13+3,3*13+9,9*13+3,9*13+9,6*13+6];
+	if(G.size==19)dots=[3*19+3,3*19+9,3*19+15,9*19+3,9*19+9,9*19+15,15*19+3,15*19+9,15*19+15];
+	ctx.fillStyle="rgb(0,0,0)";
+	ctx.beginPath();
+	for(var i=0;i<dots.length;i++){
+		ctx.moveTo(boardX(dots[i])+2.2,boardY(dots[i]));
+		ctx.arc(boardX(dots[i]),boardY(dots[i]),2.2,0,2*Math.PI,true);
+	}
+	ctx.fill();
+
+	for(var i=0;i<G.size*G.size;i++){
+		if(G.board[i]==1)ctx.fillStyle="rgb(0,0,0)";
+		else if(G.board[i]==-1)ctx.fillStyle="rgb(255,255,255)";
+		else continue;
+		ctx.beginPath();
+		ctx.moveTo(boardX(i)+STONE_SIZE,boardY(i));
+		ctx.arc(boardX(i),boardY(i),STONE_SIZE,0,2*Math.PI,true);
+		ctx.fill();
+	}
+}
+
+function interfaceGameState(state){
+	gameState=state;
+	cvs.classList[gameState==GS_TURN?"add":"remove"]("mouse-pointer");
+
+	if(gameState==GS_TURN){
+		setGameStatus("Your turn.");
+	} else if(gameState==GS_WAIT){
+		setGameStatus("Waiting for move from opponent.");
+	} else if(gameState==GS_FINISH){
+		var linktext="<a href=\"javascript:doCloseGame()\">Click here</a> to close the game.";
+		if(winningPlayer!=null){
+			var s="Player <b>"+winningPlayer.name+"</b> has won the game! ";
+			s+=["Congratulations!","Too bad, maybe better next time."][+(winningPlayer.id==myId)];
+			s+="<br>"+linktext;
+			setGameStatus(s);
+		} else {
+			var s="The other player closed the game.<br>"+linktext;
+			setGameStatus(s);
+		}
+	}
+}
+
+function doCreateGame(){
+	var otherid=document.getElementById("other_player_select").value;
+	if(!otherid){
+		alert("No other player selected!");
+		return;
+	}
+	var size=+document.getElementById("board_size").value;
+	if(isNaN(size)||size<5||size>99||size%1!=0){
+		alert("Invalid board size!");
+		return;
+	}
+
+	socket.emit("create_game",+otherid,size);
+}
+
+function doCloseGame(){
+	socket.emit("leave_game",currentGame.id);
+	interfaceSwitch("connect");
+}
+
+function mouseEventToIndex(ev){
+	var bbox=cvs.getBoundingClientRect();
+	var x=~~((ev.clientX-bbox.left)/CELL_WID),y=~~((ev.clientY-bbox.top)/CELL_WID);
+	if(x<0||x>=currentGame.size||y<0||y>=currentGame.size)return null;
+	return y*currentGame.size+x;
+}
+
+function initCanvasListeners(){
+	cvs.addEventListener("click",function(ev){
+		if(!currentGame||gameState!=GS_TURN)return;
+		var i=mouseEventToIndex(ev);
+		if(i==null)return;
+
+		if(currentGame.board[i]!=0)return;
+
+		socket.emit("game_move",currentGame.id,i);
+	});
+	cvs.addEventListener("mousemove",function(ev){
+		if(!currentGame||gameState!=GS_TURN)return;
+		var i=mouseEventToIndex(ev);
+		if(i==null)return;
+
+		if(currentGame.board[i]!=0)return;
+
+		redrawBoard();
+		ctx.fillStyle=["rgba(0,0,0,0.5)","rgba(255,255,255,0.5)"][currentGame.onturn];
+		ctx.beginPath();
+		ctx.moveTo(boardX(i)+STONE_SIZE,boardY(i));
+		ctx.arc(boardX(i),boardY(i),STONE_SIZE,0,2*Math.PI,true);
+		ctx.fill();
+	});
+	cvs.addEventListener("mouseleave",function(ev){
+		redrawBoard();
+	});
+}
+
+window.addEventListener("load",function(){
+	cvs=document.getElementById("cvs");
+	ctx=cvs.getContext("2d");
+	initConnect();
+	initCanvasListeners();
+});
+</script>
+<style>
+body {
+	font-family: sans-serif;
+}
+canvas {
+	border: 1px black solid;
+}
+#info {
+	padding: 5px;
+	border-radius: 8px;
+	border: 1px black solid;
+	display: inline-block;
+	margin-bottom: 5px;
+}
+#status {
+	font-style: italic;
+}
+#colour_note {
+	font-style: italic;
+}
+.invisible {
+	display: none;
+}
+.mouse-pointer {
+	cursor: pointer;
+}
+</style>
+</head>
+<body>
+<h2>CaptureGo</h2>
+
+<div id="info"></div><br>
+<div id="status"></div>
+
+<div id="cont_connect" class="invisible">
+	<h3>Create a game with a friend</h3>
+	Select the other player to invite: <select id="other_player_select"></select><br>
+	Board size: <input type="number" id="board_size" value="9" style="width:60px"><br>
+	<input type="button" value="Create Game" onclick="doCreateGame()">
+</div>
+
+<div id="cont_game" class="invisible">
+	<h3 id="game_header"></h3>
+	<div id="game_status"></div>
+	<canvas id="cvs"></canvas><br>
+	<div id="colour_note"></div>
+</div>
+</body>
+</html>
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..488af0f
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,622 @@
+{
+  "name": "capturego",
+  "version": "0.1.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "accepts": {
+      "version": "1.3.4",
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+      "requires": {
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+        "negotiator": "0.6.1"
+      }
+    },
+    "after": {
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..564981d
--- /dev/null
+++ b/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "capturego",
+  "version": "0.1.0",
+  "description": "",
+  "main": "capturego_server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Tom Smeding <tom.smeding@gmail.com> (https://tomsmeding.com)",
+  "license": "MIT",
+  "dependencies": {
+    "express": "^4.16.2",
+    "naampje": "^1.0.1",
+    "socket.io": "^2.0.4"
+  }
+}