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Create a Tetris webpage game #1

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31 changes: 31 additions & 0 deletions index.html
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<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>俄罗斯方块 (Tetris)</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="game-container">
<div class="game-info">
<h1>俄罗斯方块</h1>
<div class="score-board">
<p>分数: <span id="score">0</span></p>
<p>等级: <span id="level">1</span></p>
<p>消除行: <span id="lines">0</span></p>
</div>
<div class="controls-info">
<p>← / → : 移动</p>
<p>↑ : 旋转</p>
<p>↓ : 加速下落</p>
<p>空格 : 直接掉落</p>
<p>P : 暂停</p>
</div>
<button id="start-btn">开始游戏</button>
</div>
<canvas id="tetris" width="240" height="400"></canvas>
</div>
<script src="script.js"></script>
</body>
</html>
321 changes: 321 additions & 0 deletions script.js
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const canvas = document.getElementById('tetris');
const context = canvas.getContext('2d');

context.scale(20, 20);

const colors = [
null,
'#FF0D72',
'#0DC2FF',
'#0DFF72',
'#F538FF',
'#FF8E0D',
'#FFE138',
'#3877FF',
];

const SHAPES = 'ILJOTSZ';

function arenaSweep() {
let rowCount = 1;
outer: for (let y = arena.length - 1; y > 0; --y) {
for (let x = 0; x < arena[y].length; ++x) {
if (arena[y][x] === 0) {
continue outer;
}
}

const row = arena.splice(y, 1)[0].fill(0);
arena.unshift(row);
++y;

player.score += rowCount * 10;
player.lines += 1;
rowCount *= 2;
}
updateScore();
}

function collide(arena, player) {
const [m, o] = [player.matrix, player.pos];
for (let y = 0; y < m.length; ++y) {
for (let x = 0; x < m[y].length; ++x) {
if (m[y][x] !== 0 &&
(arena[y + o.y] &&
arena[y + o.y][x + o.x]) !== 0) {
return true;
}
}
}
return false;
}

function createMatrix(w, h) {
const matrix = [];
while (h--) {
matrix.push(new Array(w).fill(0));
}
return matrix;
}

function createPiece(type) {
if (type === 'I') {
return [
[0, 1, 0, 0],
[0, 1, 0, 0],
[0, 1, 0, 0],
[0, 1, 0, 0],
];
} else if (type === 'L') {
return [
[0, 2, 0],
[0, 2, 0],
[0, 2, 2],
];
} else if (type === 'J') {
return [
[0, 3, 0],
[0, 3, 0],
[3, 3, 0],
];
} else if (type === 'O') {
return [
[4, 4],
[4, 4],
];
} else if (type === 'Z') {
return [
[5, 5, 0],
[0, 5, 5],
[0, 0, 0],
];
} else if (type === 'S') {
return [
[0, 6, 6],
[6, 6, 0],
[0, 0, 0],
];
} else if (type === 'T') {
return [
[0, 7, 0],
[7, 7, 7],
[0, 0, 0],
];
}
}

function draw() {
context.fillStyle = '#000';
context.fillRect(0, 0, canvas.width, canvas.height);

drawMatrix(arena, {x: 0, y: 0});
drawMatrix(player.matrix, player.pos);
}

function drawMatrix(matrix, offset) {
matrix.forEach((row, y) => {
row.forEach((value, x) => {
if (value !== 0) {
context.fillStyle = colors[value];
context.fillRect(x + offset.x, y + offset.y, 1, 1);

// Add a border effect
context.lineWidth = 0.05;
context.strokeStyle = 'white';
context.strokeRect(x + offset.x, y + offset.y, 1, 1);
}
});
});
}

function merge(arena, player) {
player.matrix.forEach((row, y) => {
row.forEach((value, x) => {
if (value !== 0) {
arena[y + player.pos.y][x + player.pos.x] = value;
}
});
});
}

function playerDrop() {
player.pos.y++;
if (collide(arena, player)) {
player.pos.y--;
merge(arena, player);
playerReset();
arenaSweep();
}
dropCounter = 0;
}

function playerMove(dir) {
player.pos.x += dir;
if (collide(arena, player)) {
player.pos.x -= dir;
}
}

function playerReset() {
const pieces = 'ILJOTSZ';
player.matrix = createPiece(pieces[pieces.length * Math.random() | 0]);
player.pos.y = 0;
player.pos.x = (arena[0].length / 2 | 0) -
(player.matrix[0].length / 2 | 0);

if (collide(arena, player)) {
// Game Over
arena.forEach(row => row.fill(0));
player.score = 0;
player.lines = 0;
player.level = 1;
updateScore();
isPaused = true;
alert('游戏结束！');
document.getElementById('start-btn').innerText = '开始游戏';
document.getElementById('start-btn').disabled = false;
}
}

function playerRotate(dir) {
const pos = player.pos.x;
let offset = 1;
rotate(player.matrix, dir);
while (collide(arena, player)) {
player.pos.x += offset;
offset = -(offset + (offset > 0 ? 1 : -1));
if (offset > player.matrix[0].length) {
rotate(player.matrix, -dir);
player.pos.x = pos;
return;
}
}
}

function rotate(matrix, dir) {
for (let y = 0; y < matrix.length; ++y) {
for (let x = 0; x < y; ++x) {
[
matrix[x][y],
matrix[y][x],
] = [
matrix[y][x],
matrix[x][y],
];
}
}

if (dir > 0) {
matrix.forEach(row => row.reverse());
} else {
matrix.reverse();
}
}

let dropCounter = 0;
let dropInterval = 1000;

let lastTime = 0;
let isPaused = true;

function update(time = 0) {
if (isPaused) return;

const deltaTime = time - lastTime;
lastTime = time;

dropCounter += deltaTime;
if (dropCounter > dropInterval) {
playerDrop();
}

draw();
requestAnimationFrame(update);
}

function updateScore() {
document.getElementById('score').innerText = player.score;
document.getElementById('lines').innerText = player.lines;

// Simple level up mechanic
const newLevel = Math.floor(player.lines / 10) + 1;
if (newLevel > player.level) {
player.level = newLevel;
dropInterval = Math.max(100, 1000 - (player.level - 1) * 100);
}
document.getElementById('level').innerText = player.level;
}

const arena = createMatrix(12, 20);

const player = {
pos: {x: 0, y: 0},
matrix: null,
score: 0,
lines: 0,
level: 1,
};

document.addEventListener('keydown', event => {
if (isPaused) {
if (event.keyCode === 80) { // P to unpause
togglePause();
}
return;
}

if (event.keyCode === 37) {
playerMove(-1);
} else if (event.keyCode === 39) {
playerMove(1);
} else if (event.keyCode === 40) {
playerDrop();
} else if (event.keyCode === 81) { // Q
playerRotate(-1);
} else if (event.keyCode === 87 || event.keyCode === 38) { // W or Up
playerRotate(1);
} else if (event.keyCode === 32) { // Space
while (!collide(arena, player)) {
player.pos.y++;
}
player.pos.y--;
merge(arena, player);
playerReset();
arenaSweep();
dropCounter = 0;
} else if (event.keyCode === 80) { // P
togglePause();
}
});

function togglePause() {
isPaused = !isPaused;
const startBtn = document.getElementById('start-btn');
if (isPaused) {
startBtn.innerText = '继续游戏';
startBtn.disabled = false;
} else {
startBtn.innerText = '游戏进行中...';
startBtn.disabled = true;
lastTime = performance.now();
requestAnimationFrame(update);
}
}

document.getElementById('start-btn').addEventListener('click', () => {
if (isPaused) {
if (player.matrix === null) { // First start
playerReset();
updateScore();
draw(); // Draw initial state
}
togglePause();
}
});

// Initialize visual state
playerReset();
updateScore();
draw();
isPaused = true;
document.getElementById('start-btn').innerText = '开始游戏';
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