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テトリス
Developer User5671｜Date and time 23/8/25 19:52:56
Build time 70.998 sec｜Game capacity 7.896KB｜

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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 {
            margin: 0;
            padding: 0;
            overflow: hidden;
        }
        canvas {
            display: block;
            background: #000;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <canvas id="tetris" width="240" height="400"></canvas>
    <script>
        // キャンバスの初期化
        const canvas = document.getElementById('tetris');
        const context = canvas.getContext('2d');
        context.scale(20, 20);

// スコアの計算
        function calculateScore() {
            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;
                rowCount *= 2;
            }
        }

// 衝突検知
        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;
        }

// マトリックスの作成
        function createMatrix(w, h) {
            const matrix = [];
            while (h--) {
                matrix.push(new Array(w).fill(0));
            }
            return matrix;
        }

// ピースの作成
        function createPiece(type) {
            if (type === 'T') {
                return [
                    [0, 0, 0],
                    [1, 1, 1],
                    [0, 1, 0],
                ];
            } else if (type === 'O') {
                return [
                    [2, 2],
                    [2, 2],
                ];
            } else if (type === 'L') {
                return [
                    [0, 3, 0],
                    [0, 3, 0],
                    [0, 3, 3],
                ];
            } else if (type === 'J') {
                return [
                    [0, 4, 0],
                    [0, 4, 0],
                    [4, 4, 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],
                ];
            }
        }

// ピースの描画
        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);
                    }
                });
            });
        }

// 画面の描画
        function draw() {
            context.fillStyle = '#000';
            context.fillRect(0, 0, canvas.width, canvas.height);

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

// ピースのマージ
        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;
                    }
                });
            });
        }

// ピースの回転
        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();
            }
        }

// ピースの移動
        function playerDrop() {
            player.pos.y++;
            if (collide(arena, player)) {
                player.pos.y--;
                merge(arena, player);
                playerReset();
                calculateScore();
                if (collide(arena, player)) {
                    // ゲームオーバー処理
                    arena.forEach(row => row.fill(0));
                    player.score = 0;
                }
            }
            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)) {
                arena.forEach(row => row.fill(0));
                player.score = 0;
            }
        }

let dropCounter = 0;
        let dropInterval = 1000;

let lastTime = 0;
        function update(time = 0) {
            const deltaTime = time - lastTime;

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

lastTime = time;

draw();
            requestAnimationFrame(update);
        }

const colors = [
            null,
            '#ff0d72',
            '#0dc2ff',
            '#0dff72',
            '#f538ff',
            '#ff8e0d',
            '#ffe138',
            '#3877ff',
        ];

const arena = createMatrix(12, 20);

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

playerReset();
        update();
    </script>
</body>
</html>