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Add Snake web app optimized for iOS

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Touch-friendly Snake game with swipe controls, d-pad button alternative,
pause/resume, high score tracking, and iOS home screen support.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AV1WVGPNjtacTHkKWnobPY
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Claude
2026-07-17 19:37:29 +00:00
parent b7077400cf
commit 000ef4b058
1 changed files with 517 additions and 0 deletions
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snake/index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no, viewport-fit=cover">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="apple-mobile-web-app-title" content="Snake">
<title>Snake</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
--bg: #0f172a;
--surface: #1e293b;
--border: #334155;
--text: #f1f5f9;
--muted: #94a3b8;
--snake: #22c55e;
--snake-head: #4ade80;
--food: #ef4444;
--accent: #3b82f6;
}
html, body {
height: 100%;
overflow: hidden;
background: var(--bg);
color: var(--text);
font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', system-ui, sans-serif;
touch-action: none;
-webkit-touch-callout: none;
-webkit-user-select: none;
user-select: none;
}
.container {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
height: 100%;
padding: env(safe-area-inset-top) 16px env(safe-area-inset-bottom);
gap: 12px;
}
.header {
display: flex;
justify-content: space-between;
align-items: center;
width: 100%;
max-width: 400px;
padding: 0 4px;
}
.score {
font-size: 20px;
font-weight: 700;
font-variant-numeric: tabular-nums;
}
.high-score {
font-size: 14px;
color: var(--muted);
font-variant-numeric: tabular-nums;
}
.canvas-wrap {
position: relative;
background: var(--surface);
border: 2px solid var(--border);
border-radius: 12px;
overflow: hidden;
}
canvas {
display: block;
}
.overlay {
position: absolute;
inset: 0;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
background: rgba(15, 23, 42, 0.85);
backdrop-filter: blur(6px);
-webkit-backdrop-filter: blur(6px);
gap: 16px;
border-radius: 10px;
}
.overlay.hidden { display: none; }
.overlay h1 {
font-size: 28px;
font-weight: 800;
letter-spacing: -0.5px;
}
.overlay .subtitle {
font-size: 15px;
color: var(--muted);
}
.overlay .final-score {
font-size: 48px;
font-weight: 800;
color: var(--snake);
}
.btn {
background: var(--accent);
color: #fff;
border: none;
padding: 14px 40px;
border-radius: 12px;
font-size: 17px;
font-weight: 600;
cursor: pointer;
-webkit-tap-highlight-color: transparent;
transition: transform 0.1s;
}
.btn:active { transform: scale(0.95); }
.controls {
display: grid;
grid-template-areas:
". up ."
"left down right";
grid-template-columns: repeat(3, 64px);
grid-template-rows: repeat(2, 64px);
gap: 6px;
}
.d-btn {
width: 64px;
height: 64px;
border-radius: 14px;
border: 2px solid var(--border);
background: var(--surface);
color: var(--text);
font-size: 24px;
display: flex;
align-items: center;
justify-content: center;
cursor: pointer;
-webkit-tap-highlight-color: transparent;
transition: background 0.1s, transform 0.08s;
}
.d-btn:active {
background: var(--border);
transform: scale(0.92);
}
.d-up { grid-area: up; }
.d-left { grid-area: left; }
.d-down { grid-area: down; }
.d-right { grid-area: right; }
.mode-toggle {
display: flex;
gap: 8px;
align-items: center;
}
.mode-toggle label {
font-size: 13px;
color: var(--muted);
}
.toggle-btn {
padding: 6px 14px;
border-radius: 8px;
border: 1px solid var(--border);
background: transparent;
color: var(--muted);
font-size: 13px;
cursor: pointer;
-webkit-tap-highlight-color: transparent;
transition: all 0.15s;
}
.toggle-btn.active {
background: var(--accent);
color: #fff;
border-color: var(--accent);
}
.pause-hint {
font-size: 12px;
color: var(--muted);
}
</style>
</head>
<body>
<div class="container">
<div class="header">
<span class="score" id="score">0</span>
<span class="high-score" id="highScore">Best: 0</span>
</div>
<div class="canvas-wrap" id="canvasWrap">
<canvas id="game"></canvas>
<div class="overlay" id="startScreen">
<h1>Snake</h1>
<p class="subtitle">Swipe or use buttons to play</p>
<button class="btn" id="startBtn">Play</button>
</div>
<div class="overlay hidden" id="gameOverScreen">
<h1>Game Over</h1>
<div class="final-score" id="finalScore">0</div>
<p class="subtitle" id="newRecord" style="display:none;color:var(--snake)">New Record!</p>
<button class="btn" id="restartBtn">Play Again</button>
</div>
<div class="overlay hidden" id="pauseScreen">
<h1>Paused</h1>
<button class="btn" id="resumeBtn">Resume</button>
</div>
</div>
<div class="mode-toggle">
<label>Control:</label>
<button class="toggle-btn active" id="swipeMode">Swipe</button>
<button class="toggle-btn" id="btnMode">Buttons</button>
</div>
<div class="controls" id="dpad" style="display:none">
<button class="d-btn d-up" data-dir="up">&#9650;</button>
<button class="d-btn d-left" data-dir="left">&#9664;</button>
<button class="d-btn d-down" data-dir="down">&#9660;</button>
<button class="d-btn d-right" data-dir="right">&#9654;</button>
</div>
<p class="pause-hint" id="pauseHint" style="display:none">Tap canvas to pause</p>
</div>
<script>
const canvas = document.getElementById('game');
const ctx = canvas.getContext('2d');
const scoreEl = document.getElementById('score');
const highScoreEl = document.getElementById('highScore');
const startScreen = document.getElementById('startScreen');
const gameOverScreen = document.getElementById('gameOverScreen');
const pauseScreen = document.getElementById('pauseScreen');
const finalScoreEl = document.getElementById('finalScore');
const newRecordEl = document.getElementById('newRecord');
const dpad = document.getElementById('dpad');
const pauseHint = document.getElementById('pauseHint');
const GRID = 20;
let cols, rows, cellSize;
let snake, dir, nextDir, food, score, highScore, gameState, speed, lastTick;
let useSwipe = true;
function resize() {
const maxW = Math.min(window.innerWidth - 32, 400);
const maxH = window.innerHeight * (useSwipe ? 0.65 : 0.48);
cellSize = Math.floor(Math.min(maxW, maxH) / GRID);
cols = GRID;
rows = GRID;
canvas.width = cols * cellSize;
canvas.height = rows * cellSize;
document.getElementById('canvasWrap').style.width = canvas.width + 'px';
document.getElementById('canvasWrap').style.height = canvas.height + 'px';
}
function init() {
highScore = parseInt(localStorage.getItem('snakeHigh') || '0');
highScoreEl.textContent = 'Best: ' + highScore;
resize();
gameState = 'start';
draw();
}
function startGame() {
const mid = Math.floor(GRID / 2);
snake = [{x: mid, y: mid}, {x: mid - 1, y: mid}, {x: mid - 2, y: mid}];
dir = {x: 1, y: 0};
nextDir = {x: 1, y: 0};
score = 0;
speed = 150;
scoreEl.textContent = '0';
placeFood();
gameState = 'playing';
startScreen.classList.add('hidden');
gameOverScreen.classList.add('hidden');
pauseScreen.classList.add('hidden');
pauseHint.style.display = 'block';
lastTick = performance.now();
requestAnimationFrame(loop);
}
function placeFood() {
const occupied = new Set(snake.map(s => s.x + ',' + s.y));
let pos;
do {
pos = {x: Math.floor(Math.random() * cols), y: Math.floor(Math.random() * rows)};
} while (occupied.has(pos.x + ',' + pos.y));
food = pos;
}
function loop(now) {
if (gameState !== 'playing') return;
if (now - lastTick >= speed) {
lastTick = now;
update();
}
draw();
requestAnimationFrame(loop);
}
function update() {
dir = nextDir;
const head = {x: snake[0].x + dir.x, y: snake[0].y + dir.y};
if (head.x < 0 || head.x >= cols || head.y < 0 || head.y >= rows) return gameOver();
for (const s of snake) if (s.x === head.x && s.y === head.y) return gameOver();
snake.unshift(head);
if (head.x === food.x && head.y === food.y) {
score++;
scoreEl.textContent = score;
if (speed > 70) speed -= 2;
placeFood();
} else {
snake.pop();
}
}
function draw() {
ctx.fillStyle = '#1e293b';
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.strokeStyle = '#263248';
ctx.lineWidth = 0.5;
for (let i = 1; i < cols; i++) {
ctx.beginPath(); ctx.moveTo(i * cellSize, 0); ctx.lineTo(i * cellSize, canvas.height); ctx.stroke();
}
for (let i = 1; i < rows; i++) {
ctx.beginPath(); ctx.moveTo(0, i * cellSize); ctx.lineTo(canvas.width, i * cellSize); ctx.stroke();
}
const r = cellSize * 0.42;
ctx.fillStyle = '#ef4444';
ctx.shadowColor = '#ef4444';
ctx.shadowBlur = 10;
ctx.beginPath();
ctx.arc(food.x * cellSize + cellSize / 2, food.y * cellSize + cellSize / 2, r, 0, Math.PI * 2);
ctx.fill();
ctx.shadowBlur = 0;
for (let i = snake.length - 1; i >= 0; i--) {
const s = snake[i];
const pad = 1;
const sz = cellSize - pad * 2;
const radius = i === 0 ? sz * 0.35 : sz * 0.25;
const x = s.x * cellSize + pad;
const y = s.y * cellSize + pad;
ctx.fillStyle = i === 0 ? '#4ade80' : '#22c55e';
ctx.beginPath();
ctx.moveTo(x + radius, y);
ctx.arcTo(x + sz, y, x + sz, y + sz, radius);
ctx.arcTo(x + sz, y + sz, x, y + sz, radius);
ctx.arcTo(x, y + sz, x, y, radius);
ctx.arcTo(x, y, x + sz, y, radius);
ctx.closePath();
ctx.fill();
if (i === 0) {
ctx.fillStyle = '#0f172a';
const eyeR = cellSize * 0.1;
const eyeOff = cellSize * 0.22;
let e1x = s.x * cellSize + cellSize / 2;
let e1y = s.y * cellSize + cellSize / 2;
let e2x = e1x, e2y = e1y;
if (dir.x === 1) { e1x += eyeOff; e2x += eyeOff; e1y -= eyeOff; e2y += eyeOff; }
else if (dir.x === -1) { e1x -= eyeOff; e2x -= eyeOff; e1y -= eyeOff; e2y += eyeOff; }
else if (dir.y === -1) { e1x -= eyeOff; e2x += eyeOff; e1y -= eyeOff; e2y -= eyeOff; }
else { e1x -= eyeOff; e2x += eyeOff; e1y += eyeOff; e2y += eyeOff; }
ctx.beginPath(); ctx.arc(e1x, e1y, eyeR, 0, Math.PI * 2); ctx.fill();
ctx.beginPath(); ctx.arc(e2x, e2y, eyeR, 0, Math.PI * 2); ctx.fill();
}
}
}
function gameOver() {
gameState = 'over';
pauseHint.style.display = 'none';
finalScoreEl.textContent = score;
if (score > highScore) {
highScore = score;
localStorage.setItem('snakeHigh', highScore);
highScoreEl.textContent = 'Best: ' + highScore;
newRecordEl.style.display = 'block';
} else {
newRecordEl.style.display = 'none';
}
gameOverScreen.classList.remove('hidden');
}
function setDirection(d) {
if (gameState !== 'playing') return;
const map = {
up: {x: 0, y: -1},
down: {x: 0, y: 1},
left: {x: -1, y: 0},
right: {x: 1, y: 0}
};
const nd = map[d];
if (!nd) return;
if (nd.x + dir.x === 0 && nd.y + dir.y === 0) return;
nextDir = nd;
}
function togglePause() {
if (gameState === 'playing') {
gameState = 'paused';
pauseScreen.classList.remove('hidden');
} else if (gameState === 'paused') {
gameState = 'playing';
pauseScreen.classList.add('hidden');
lastTick = performance.now();
requestAnimationFrame(loop);
}
}
// Swipe detection
let touchStart = null;
canvas.addEventListener('touchstart', e => {
e.preventDefault();
if (!useSwipe && (gameState === 'playing' || gameState === 'paused')) {
togglePause();
return;
}
touchStart = {x: e.touches[0].clientX, y: e.touches[0].clientY};
}, {passive: false});
canvas.addEventListener('touchmove', e => e.preventDefault(), {passive: false});
canvas.addEventListener('touchend', e => {
if (!useSwipe || !touchStart) return;
const dx = e.changedTouches[0].clientX - touchStart.x;
const dy = e.changedTouches[0].clientY - touchStart.y;
const dist = Math.sqrt(dx * dx + dy * dy);
if (dist < 20) {
togglePause();
touchStart = null;
return;
}
if (Math.abs(dx) > Math.abs(dy)) {
setDirection(dx > 0 ? 'right' : 'left');
} else {
setDirection(dy > 0 ? 'down' : 'up');
}
touchStart = null;
}, {passive: false});
// Keyboard
document.addEventListener('keydown', e => {
const keyMap = {ArrowUp: 'up', ArrowDown: 'down', ArrowLeft: 'left', ArrowRight: 'right',
w: 'up', s: 'down', a: 'left', d: 'right'};
if (keyMap[e.key]) { e.preventDefault(); setDirection(keyMap[e.key]); }
if (e.key === ' ' || e.key === 'Escape') { e.preventDefault(); togglePause(); }
});
// D-pad buttons
document.querySelectorAll('.d-btn').forEach(btn => {
btn.addEventListener('touchstart', e => {
e.preventDefault();
e.stopPropagation();
setDirection(btn.dataset.dir);
}, {passive: false});
btn.addEventListener('click', e => {
e.stopPropagation();
setDirection(btn.dataset.dir);
});
});
// Control mode toggle
document.getElementById('swipeMode').addEventListener('click', () => {
useSwipe = true;
document.getElementById('swipeMode').classList.add('active');
document.getElementById('btnMode').classList.remove('active');
dpad.style.display = 'none';
resize(); draw();
});
document.getElementById('btnMode').addEventListener('click', () => {
useSwipe = false;
document.getElementById('btnMode').classList.add('active');
document.getElementById('swipeMode').classList.remove('active');
dpad.style.display = 'grid';
resize(); draw();
});
document.getElementById('startBtn').addEventListener('click', startGame);
document.getElementById('restartBtn').addEventListener('click', startGame);
document.getElementById('resumeBtn').addEventListener('click', togglePause);
window.addEventListener('resize', () => { resize(); if (gameState !== 'start') draw(); });
food = {x: 5, y: 5};
snake = [{x: 10, y: 10}];
dir = {x: 1, y: 0};
init();
</script>
</body>
</html>