<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Tetris Bulat</title>
<style>
body {
margin: 0;
background: #111;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
canvas {
background: #222;
border: 5px solid #fff;
}
</style>
</head>
<body>
<canvas id="tetris" width="300" height="600"></canvas>
<script>
const canvas = document.getElementById("tetris");
const context = canvas.getContext("2d");
context.scale(30, 30);
const colors = [null, "red", "blue", "green", "yellow", "purple", "cyan", "orange"];
const arena = createMatrix(10, 20);
function createMatrix(w, h) {
const matrix = [];
while (h--) {
matrix.push(new Array(w).fill(0));
}
return matrix;
}
function createPiece(type) {
if (type === 'T') {
return [
[0, 1, 0],
[1, 1, 1],
[0, 0, 0],
];
} else if (type === 'O') {
return [
[2, 2],
[2, 2],
];
} else if (type === 'L') {
return [
[0, 0, 3],
[3, 3, 3],
[0, 0, 0],
];
} else if (type === 'J') {
return [
[4, 0, 0],
[4, 4, 4],
[0, 0, 0],
];
} else if (type === 'I') {
return [
[0, 5, 0, 0],
[0, 5, 0, 0],
[0, 5, 0, 0],
[0, 5, 0, 0],
];
} else if (type === 'S') {
return [
[0, 6, 6],
[6, 6, 0],
[0, 0, 0],
];
} else if (type === 'Z') {
return [
[7, 7, 0],
[0, 7, 7],
[0, 0, 0],
];
}
}
function drawMatrix(matrix, offset) {
matrix.forEach((row, y) => {
row.forEach((value, x) => {
if (value !== 0) {
context.beginPath();
context.arc(x + offset.x + 0.5, y + offset.y + 0.5, 0.5, 0, 2 * Math.PI);
context.fillStyle = colors[value];
context.fill();
}
});
});
}
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 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 collide(arena, player) {
const m = player.matrix;
const o = 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 arenaSweep() {
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;
}
}
function playerDrop() {
player.pos.y++;
if (collide(arena, player)) {
player.pos.y--;
merge(arena, player);
arenaSweep();
playerReset();
}
dropCounter = 0;
}
function playerMove(dir) {
player.pos.x += dir;
if (collide(arena, player)) {
player.pos.x -= dir;
}
}
function rotate(matrix) {
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]];
}
}
matrix.forEach(row => row.reverse());
}
function playerRotate() {
const pos = player.pos.x;
let offset = 1;
rotate(player.matrix);
while (collide(arena, player)) {
player.pos.x += offset;
offset = -(offset + (offset > 0 ? 1 : -1));
if (offset > player.matrix[0].length) {
rotate(player.matrix);
rotate(player.matrix);
rotate(player.matrix);
player.pos.x = pos;
return;
}
}
}
function playerReset() {
const pieces = 'TJLOSZI';
player.matrix = createPiece(pieces[Math.floor(Math.random() * pieces.length)]);
player.pos.y = 0;
player.pos.x = (arena[0].length / 2 | 0) - (player.matrix[0].length / 2 | 0);
if (collide(arena, player)) {
arena.forEach(row => row.fill(0));
}
}
let dropCounter = 0;
let dropInterval = 1000;
let lastTime = 0;
function update(time = 0) {
const deltaTime = time - lastTime;
lastTime = time;
dropCounter += deltaTime;
if (dropCounter > dropInterval) {
playerDrop();
}
draw();
requestAnimationFrame(update);
}
document.addEventListener("keydown", event => {
if (event.keyCode === 37) {
playerMove(-1);
} else if (event.keyCode === 39) {
playerMove(1);
} else if (event.keyCode === 40) {
playerDrop();
} else if (event.keyCode === 38) {
playerRotate();
}
});
const player = {
pos: {x: 0, y: 0},
matrix: null,
};
playerReset();
update();
</script>
</body>
</html>
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