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テトリス
Developer User20650｜Date and time 24/3/1 9:14:40
Build time 25.364 sec｜Game capacity 6.89KB｜

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Click here for free DL of the app version that can save data.

<!DOCTYPE html>
<html>
<head>
    <title>Tetris</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        #tetris {
            border: 2px solid #333;
        }
    </style>
</head>
<body>
    <canvas id="tetris" width="300" height="600"></canvas>

const canvas = document.getElementById('tetris');
        const context = canvas.getContext('2d');

const ROW = 20;
        const COLUMN = 10;
        const SIZE = 30;

const arena = createMatrix(COLUMN, ROW);

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

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 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();
            }
        }

function playerReset() {
            const pieces = 'ILJOTSZ';
            player.matrix = createPiece(pieces[pieces.length * Math.random() | 0]);
            player.pos.y = 0;
            player.pos.x = (COLUMN / 2 | 0) - (player.matrix[0].length / 2 | 0);
            if (collide(arena, player)) {
                arena.forEach(row => row.fill(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);
        }

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);
        }

const player = {
            pos: {x: 0, y: 0},
            matrix: null
        };

playerReset();
        update();

</script>
</body>
</html>