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answer_stage5.js
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answer_stage5.js
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// 90度時計回りに回転
// https://codereview.stackexchange.com/a/186834
function rotate(matrix) {
const N = matrix.length - 1;
const result = matrix.map((row, i) => row.map((col, j) => matrix[N - j][i]));
return result;
}
// キーボード入力イベントのリッスン
document.addEventListener("keydown", function (e) {
if (isGameOver) return;
switch (e.code) {
// 左、右キー (移動)
case "ArrowLeft":
case "ArrowRight": {
const col =
e.code === "ArrowLeft" ? tetromino.col - 1 : tetromino.col + 1;
if (canMove(tetromino.matrix, tetromino.row, col)) {
tetromino.col = col;
}
break;
}
case "Space": {
// スペースキー(回転)
const matrix = rotate(tetromino.matrix);
if (canMove(matrix, tetromino.row, tetromino.col)) {
tetromino.matrix = matrix;
}
break;
}
case "ArrowDown": {
// 下キー(落下)
const row = tetromino.row + 1;
if (!canMove(tetromino.matrix, row, tetromino.col)) {
tetromino.row = row - 1;
placeTetromino();
return;
}
tetromino.row = row;
break;
}
case "ArrowUp": {
// 上キー(ハードドロップ)
while (canMove(tetromino.matrix, tetromino.row + 1, tetromino.col)) {
tetromino.row++;
}
break;
}
// 問題: 回転イベントを発生させるkeyEvent条件分岐を追加すること
// 参考サイト: https://developer.mozilla.org/ja/docs/Web/API/KeyboardEvent/keyCode
// 参考サイト: https://www.javadrive.jp/javascript/function/index6.html
}
});