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No:11423

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Tetris
Developer もちきなこ｜Date and time 23/8/9 17:41:50
Build time 52.955 sec｜Game capacity 6.781KB｜

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

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <style>
        body {
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            background-color: #212121;
        }

canvas {
            border: 2px solid white;
        }
    </style>
</head>
<body>
    <canvas id="tetris" width="240" height="400"></canvas>

context.scale(20, 20);

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

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

drawMatrix(player.matrix, player.pos);
        }

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

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);
        }

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

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