Initial Tictactics proof of concept

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2026-05-05 10:52:28 -04:00
commit 2833d9610a
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# Dependencies
node_modules/
# Build output
dist/
build/
out/
# Local env and editor state
.env
.env.*
!.env.example
.vscode/
.idea/
# Logs
*.log
npm-debug.log*
yarn-debug.log*
yarn-error.log*
pnpm-debug.log*
# OS files
.DS_Store
Thumbs.db

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# Tictactics
A notepad-playable browser game that combines Tic Tac Toe's line-making goal with a small capture mechanic.
## Rules
- Two players alternate placing `X` and `O` on empty cells.
- The board is `5 x 5`.
- After placing a mark, enemy marks trapped in a straight line between the new mark and another friendly mark are captured and removed.
- Captures can happen in any of the eight directions.
- First player to make `4 in a row` wins.
- If the board fills with no winner, the game is a draw.
## Run
Open `index.html` in a browser.
No build step is required.

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const size = 5;
const target = 4;
const empty = "";
const directions = [
[-1, -1],
[-1, 0],
[-1, 1],
[0, -1],
[0, 1],
[1, -1],
[1, 0],
[1, 1],
];
const boardElement = document.querySelector("#board");
const messageElement = document.querySelector("#message");
const turnBadge = document.querySelector("#turnBadge");
const resetButton = document.querySelector("#resetButton");
const xCapturesElement = document.querySelector("#xCaptures");
const oCapturesElement = document.querySelector("#oCaptures");
const moveList = document.querySelector("#moveList");
let board;
let currentPlayer;
let captures;
let gameOver;
let moveNumber;
let winningCells;
function createBoard() {
return Array.from({ length: size }, () => Array(size).fill(empty));
}
function setupGame() {
board = createBoard();
currentPlayer = "X";
captures = { X: 0, O: 0 };
gameOver = false;
moveNumber = 0;
winningCells = [];
moveList.innerHTML = "";
render();
setMessage("Trap enemy marks between your marks. First to four wins.");
}
function render() {
boardElement.innerHTML = "";
boardElement.style.setProperty("--size", size);
for (let row = 0; row < size; row += 1) {
for (let col = 0; col < size; col += 1) {
const cell = document.createElement("button");
cell.className = "cell";
cell.type = "button";
cell.role = "gridcell";
cell.dataset.row = row;
cell.dataset.col = col;
cell.setAttribute("aria-label", cellLabel(row, col));
cell.disabled = gameOver || board[row][col] !== empty;
if (winningCells.some(([winRow, winCol]) => winRow === row && winCol === col)) {
cell.classList.add("winning");
}
if (board[row][col]) {
const mark = document.createElement("span");
mark.className = `mark mark-${board[row][col].toLowerCase()}`;
mark.textContent = board[row][col];
cell.append(mark);
}
cell.addEventListener("click", () => playMove(row, col));
boardElement.append(cell);
}
}
turnBadge.textContent = gameOver ? "Game over" : `${currentPlayer} to play`;
turnBadge.className = `turn-badge player-${currentPlayer.toLowerCase()}`;
xCapturesElement.textContent = captures.X;
oCapturesElement.textContent = captures.O;
}
function cellLabel(row, col) {
const mark = board[row][col];
const position = `row ${row + 1}, column ${col + 1}`;
return mark ? `${mark} at ${position}` : `Empty cell at ${position}`;
}
function playMove(row, col) {
if (gameOver || board[row][col] !== empty) {
return;
}
moveNumber += 1;
board[row][col] = currentPlayer;
const captured = captureFrom(row, col, currentPlayer);
captures[currentPlayer] += captured.length;
const win = findWin(currentPlayer);
addMove(row, col, captured.length);
if (win.length > 0) {
winningCells = win;
gameOver = true;
setMessage(`${currentPlayer} wins with four in a row.`);
render();
return;
}
if (isDraw()) {
gameOver = true;
setMessage("Draw. The board is full.");
render();
return;
}
currentPlayer = opponentOf(currentPlayer);
setMessage(captured.length > 0
? `${opponentOf(currentPlayer)} captured ${captured.length}. ${currentPlayer} to play.`
: `${currentPlayer} to play.`
);
render();
flashCapturedCells(captured);
}
function captureFrom(row, col, player) {
const opponent = opponentOf(player);
const captured = [];
for (const [rowStep, colStep] of directions) {
const candidates = [];
let nextRow = row + rowStep;
let nextCol = col + colStep;
while (isInside(nextRow, nextCol) && board[nextRow][nextCol] === opponent) {
candidates.push([nextRow, nextCol]);
nextRow += rowStep;
nextCol += colStep;
}
if (candidates.length > 0 && isInside(nextRow, nextCol) && board[nextRow][nextCol] === player) {
captured.push(...candidates);
}
}
for (const [captureRow, captureCol] of captured) {
board[captureRow][captureCol] = empty;
}
return captured;
}
function findWin(player) {
const axes = [
[0, 1],
[1, 0],
[1, 1],
[1, -1],
];
for (let row = 0; row < size; row += 1) {
for (let col = 0; col < size; col += 1) {
if (board[row][col] !== player) {
continue;
}
for (const [rowStep, colStep] of axes) {
const cells = [[row, col]];
for (let index = 1; index < target; index += 1) {
const nextRow = row + rowStep * index;
const nextCol = col + colStep * index;
if (!isInside(nextRow, nextCol) || board[nextRow][nextCol] !== player) {
break;
}
cells.push([nextRow, nextCol]);
}
if (cells.length === target) {
return cells;
}
}
}
}
return [];
}
function isDraw() {
return board.every((row) => row.every((cell) => cell !== empty));
}
function opponentOf(player) {
return player === "X" ? "O" : "X";
}
function isInside(row, col) {
return row >= 0 && row < size && col >= 0 && col < size;
}
function addMove(row, col, captureCount) {
const item = document.createElement("li");
const captureText = captureCount === 0 ? "" : `, captured ${captureCount}`;
item.textContent = `${moveNumber}. ${currentPlayer} to ${row + 1},${col + 1}${captureText}`;
moveList.prepend(item);
}
function setMessage(text) {
messageElement.textContent = text;
}
function flashCapturedCells(captured) {
for (const [row, col] of captured) {
const cell = boardElement.querySelector(`[data-row="${row}"][data-col="${col}"]`);
if (!cell) {
continue;
}
cell.classList.add("captured");
window.setTimeout(() => cell.classList.remove("captured"), 380);
}
}
resetButton.addEventListener("click", setupGame);
setupGame();

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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Tictactics</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<main class="app" aria-labelledby="game-title">
<section class="play-area">
<header class="topbar">
<div>
<p class="eyebrow">capture tic tac toe</p>
<h1 id="game-title">Tictactics</h1>
</div>
<button id="resetButton" class="icon-button" type="button" aria-label="Restart game" title="Restart">
<span aria-hidden="true"></span>
</button>
</header>
<div class="status-row" aria-live="polite">
<div id="turnBadge" class="turn-badge player-x">X to play</div>
<div id="message" class="message">Trap enemy marks between your marks. First to four wins.</div>
</div>
<div id="board" class="board" role="grid" aria-label="Tictactics board"></div>
</section>
<aside class="side-panel" aria-label="Game details">
<div class="score-row">
<div class="score-box">
<span class="score-label">X captures</span>
<strong id="xCaptures">0</strong>
</div>
<div class="score-box">
<span class="score-label">O captures</span>
<strong id="oCaptures">0</strong>
</div>
</div>
<div class="rule-card">
<h2>Rule</h2>
<p>Place a mark on an empty cell. Any enemy marks trapped in a straight line between your marks are removed.</p>
</div>
<ol id="moveList" class="move-list" aria-label="Move history"></ol>
</aside>
</main>
<script src="game.js"></script>
</body>
</html>

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:root {
color-scheme: light;
--ink: #161616;
--muted: #62635f;
--paper: #f9f6ee;
--panel: #fffdfa;
--line: #252525;
--grid: #d9d1bf;
--x: #cb3d3d;
--o: #216e8d;
--x-soft: #ffe1df;
--o-soft: #d9f1f8;
--focus: #6750a4;
--shadow: 0 20px 50px rgba(30, 25, 15, 0.12);
}
* {
box-sizing: border-box;
}
body {
margin: 0;
min-height: 100vh;
color: var(--ink);
background:
linear-gradient(rgba(22, 22, 22, 0.035) 1px, transparent 1px),
linear-gradient(90deg, rgba(22, 22, 22, 0.035) 1px, transparent 1px),
var(--paper);
background-size: 32px 32px;
font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button {
font: inherit;
}
.app {
width: min(1120px, calc(100vw - 32px));
min-height: 100vh;
margin: 0 auto;
display: grid;
grid-template-columns: minmax(0, 1fr) 320px;
gap: 28px;
align-items: center;
padding: 32px 0;
}
.play-area,
.side-panel {
background: rgba(255, 253, 250, 0.86);
border: 1px solid rgba(37, 37, 37, 0.12);
box-shadow: var(--shadow);
}
.play-area {
padding: 24px;
}
.side-panel {
padding: 18px;
}
.topbar,
.status-row,
.score-row {
display: flex;
align-items: center;
justify-content: space-between;
gap: 16px;
}
.eyebrow {
margin: 0 0 4px;
color: var(--muted);
font-size: 0.78rem;
font-weight: 800;
text-transform: uppercase;
}
h1 {
margin: 0;
font-size: clamp(2.2rem, 4.8rem, 5rem);
line-height: 0.92;
}
.icon-button {
width: 44px;
height: 44px;
display: inline-grid;
place-items: center;
border: 2px solid var(--line);
border-radius: 8px;
color: var(--ink);
background: var(--panel);
cursor: pointer;
transition: transform 150ms ease, background 150ms ease;
}
.icon-button:hover {
background: #eee6d6;
transform: translateY(-1px);
}
.icon-button:focus-visible,
.cell:focus-visible {
outline: 3px solid var(--focus);
outline-offset: 3px;
}
.status-row {
margin: 24px 0 18px;
}
.turn-badge {
min-width: 104px;
padding: 9px 12px;
border: 2px solid currentColor;
border-radius: 8px;
font-weight: 900;
text-align: center;
}
.player-x {
color: var(--x);
background: var(--x-soft);
}
.player-o {
color: var(--o);
background: var(--o-soft);
}
.message {
color: var(--muted);
font-size: 0.95rem;
text-align: right;
}
.board {
aspect-ratio: 1;
width: min(100%, 620px);
margin: 0 auto;
display: grid;
grid-template-columns: repeat(5, 1fr);
grid-template-rows: repeat(5, 1fr);
border: 3px solid var(--line);
background: var(--line);
gap: 3px;
}
.cell {
min-width: 0;
border: 0;
display: grid;
place-items: center;
background: var(--panel);
color: var(--ink);
cursor: pointer;
position: relative;
isolation: isolate;
}
.cell::before {
content: "";
position: absolute;
inset: 13%;
border: 2px dashed rgba(37, 37, 37, 0.14);
border-radius: 50%;
opacity: 0;
transition: opacity 120ms ease;
}
.cell:hover::before {
opacity: 1;
}
.cell[disabled] {
cursor: default;
}
.mark {
display: grid;
place-items: center;
width: 72%;
height: 72%;
border-radius: 50%;
font-size: clamp(2rem, 8vw, 4.4rem);
font-weight: 950;
line-height: 1;
transform: scale(0.96);
animation: pop 180ms ease-out;
}
.mark-x {
color: var(--x);
}
.mark-o {
color: var(--o);
}
.cell.captured {
animation: capture 360ms ease-out;
}
.cell.winning {
background: #fff0aa;
}
.score-row {
margin-bottom: 16px;
}
.score-box {
flex: 1;
padding: 14px;
border: 1px solid rgba(37, 37, 37, 0.14);
border-radius: 8px;
background: var(--panel);
}
.score-label {
display: block;
color: var(--muted);
font-size: 0.76rem;
font-weight: 800;
text-transform: uppercase;
}
.score-box strong {
display: block;
margin-top: 4px;
font-size: 2rem;
}
.rule-card {
padding: 14px;
border: 1px solid rgba(37, 37, 37, 0.14);
border-radius: 8px;
background: #f5efe2;
}
.rule-card h2 {
margin: 0 0 8px;
font-size: 1rem;
}
.rule-card p {
margin: 0;
color: var(--muted);
line-height: 1.45;
}
.move-list {
max-height: 320px;
margin: 16px 0 0;
padding: 0 0 0 24px;
overflow: auto;
color: var(--muted);
}
.move-list li {
margin-bottom: 8px;
padding-left: 4px;
}
@keyframes pop {
from {
opacity: 0;
transform: scale(0.66);
}
}
@keyframes capture {
35% {
background: #202020;
}
}
@media (max-width: 860px) {
.app {
min-height: auto;
grid-template-columns: 1fr;
align-items: start;
padding: 18px 0;
}
.play-area,
.side-panel {
padding: 16px;
}
.status-row {
align-items: flex-start;
flex-direction: column;
}
.message {
text-align: left;
}
h1 {
font-size: 3rem;
}
.move-list {
max-height: 180px;
}
}