第1回 タイピングWebアプリ制作｜ホームポジション練習編

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>ホームポジション タイピング練習</title>
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <main class="app">
    <header class="app__header">
      <div>
        <p class="app__eyebrow">のんびり研究所</p>
        <h1>ホームポジション タイピング練習</h1>
      </div>

      <dl class="status" aria-label="練習状況">
        <div class="status__item">
          <dt>残り時間</dt>
          <dd><span id="time">60</span><small>秒</small></dd>
        </div>
        <div class="status__item">
          <dt>スコア</dt>
          <dd id="score">0</dd>
        </div>
        <div class="status__item">
          <dt>ミス</dt>
          <dd id="misses">0</dd>
        </div>
      </dl>
    </header>

    <section id="play-area" class="play-area" aria-label="タイピング練習エリア">
      <p class="keys">練習キー：A S D F G H J K L ;</p>

      <div id="falling-key" class="falling-key" aria-live="off" hidden>A</div>

      <div id="start-panel" class="panel">
        <p class="panel__label">ホームポジションに手を置いたら</p>
        <p class="panel__main"><kbd>Space</kbd> キーでスタート</p>
        <p class="panel__sub">60秒間、表示された文字を入力しましょう</p>
      </div>

      <div id="countdown" class="countdown" aria-live="assertive" hidden></div>

      <div id="result-panel" class="panel result" hidden>
        <p class="panel__label">練習終了！</p>
        <h2>今回の結果</h2>
        <div class="result__scores">
          <p>スコア<strong id="final-score">0</strong></p>
          <p>ミス<strong id="final-misses">0</strong></p>
        </div>
        <p class="panel__sub">もう一度練習するときは <kbd>Space</kbd> キー</p>
      </div>
    </section>

    <p id="message" class="message" aria-live="polite">Spaceキーを押すとカウントダウンが始まります</p>
  </main>

  <script src="script.js"></script>
</body>
</html>

:root {
  color-scheme: light;
  --ink: #253044;
  --muted: #68758b;
  --line: #dbe5ed;
  --accent: #1c92a9;
  --accent-dark: #126b7d;
  --paper: #ffffff;
  --back: #eef7f8;
  font-family: "Yu Gothic UI", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 10%, #dff4f6 0, transparent 34rem),
    linear-gradient(145deg, #f8fbfc, var(--back));
}

.app {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 24px;
}

.app__header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
}

.app__eyebrow {
  margin: 0 0 4px;
  color: var(--accent-dark);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .12em;
}

h1 {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 2rem);
}

.status {
  display: flex;
  gap: 8px;
  margin: 0;
}

.status__item {
  min-width: 92px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, .88);
  text-align: center;
  box-shadow: 0 5px 18px rgba(41, 83, 94, .06);
}

.status dt {
  color: var(--muted);
  font-size: .75rem;
  font-weight: 700;
}

.status dd {
  margin: 2px 0 0;
  color: var(--accent-dark);
  font-size: 1.55rem;
  font-weight: 800;
  line-height: 1;
}

.status small {
  margin-left: 2px;
  font-size: .72rem;
}

.play-area {
  position: relative;
  height: clamp(430px, 66vh, 650px);
  overflow: hidden;
  border: 3px solid #b9dbe0;
  border-radius: 22px;
  background:
    linear-gradient(rgba(255, 255, 255, .72), rgba(255, 255, 255, .92)),
    repeating-linear-gradient(90deg, transparent 0 79px, #d9eef0 80px);
  box-shadow: 0 18px 45px rgba(37, 76, 88, .12);
}

.keys {
  position: absolute;
  z-index: 2;
  top: 14px;
  left: 18px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(.75rem, 2vw, .92rem);
  font-weight: 700;
  letter-spacing: .08em;
}

.falling-key {
  position: absolute;
  z-index: 3;
  top: 0;
  left: 0;
  width: 1.25em;
  color: var(--accent-dark);
  font-family: Arial, sans-serif;
  font-size: clamp(4rem, 10vw, 6.5rem);
  font-weight: 900;
  line-height: 1;
  text-align: center;
  text-shadow: 0 5px 0 #d4edf0;
  will-change: transform;
}

.panel {
  position: absolute;
  z-index: 4;
  top: 50%;
  left: 50%;
  width: min(560px, calc(100% - 32px));
  padding: clamp(24px, 5vw, 42px);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, .94);
  text-align: center;
  box-shadow: 0 20px 50px rgba(37, 76, 88, .15);
  transform: translate(-50%, -50%);
}

.panel__label,
.panel__sub {
  margin: 0;
  color: var(--muted);
}

.panel__main {
  margin: 16px 0;
  font-size: clamp(1.15rem, 3vw, 1.6rem);
  font-weight: 800;
}

kbd {
  display: inline-block;
  padding: .28em .65em;
  border: 1px solid #9eb8bf;
  border-bottom-width: 4px;
  border-radius: 8px;
  color: var(--accent-dark);
  background: #f8ffff;
  font: inherit;
}

.countdown {
  position: absolute;
  z-index: 5;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--accent-dark);
  background: rgba(255, 255, 255, .84);
  font-family: Arial, sans-serif;
  font-size: clamp(6rem, 22vw, 13rem);
  font-weight: 900;
  text-shadow: 0 8px 0 #d4edf0;
}

.result h2 {
  margin: 8px 0 20px;
  font-size: 1.8rem;
}

.result__scores {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

.result__scores p {
  min-width: 130px;
  margin: 0;
  padding: 14px;
  border-radius: 12px;
  color: var(--muted);
  background: #edf8f9;
  font-size: .82rem;
  font-weight: 700;
}

.result__scores strong {
  display: block;
  margin-top: 4px;
  color: var(--accent-dark);
  font-size: 2.2rem;
}

.message {
  min-height: 1.5em;
  margin: 14px 0 0;
  color: var(--muted);
  text-align: center;
  font-size: .92rem;
}

[hidden] {
  display: none !important;
}

@media (max-width: 720px) {
  .app {
    width: min(100% - 20px, 1100px);
    padding-top: 18px;
  }

  .app__header {
    align-items: stretch;
    flex-direction: column;
    gap: 12px;
  }

  .status {
    width: 100%;
  }

  .status__item {
    flex: 1;
    min-width: 0;
    padding: 8px 4px;
  }

  .play-area {
    height: 62vh;
    min-height: 400px;
    border-radius: 16px;
  }

  .result__scores {
    gap: 8px;
  }

  .result__scores p {
    min-width: 0;
    flex: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .falling-key {
    will-change: auto;
  }
}

"use strict";

const PRACTICE_KEYS = ["a", "s", "d", "f", "g", "h", "j", "k", "l", ";"];
const PRACTICE_TIME = 60;
const FALL_SPEED = 16;

const playArea = document.getElementById("play-area");
const fallingKey = document.getElementById("falling-key");
const startPanel = document.getElementById("start-panel");
const countdown = document.getElementById("countdown");
const resultPanel = document.getElementById("result-panel");
const timeDisplay = document.getElementById("time");
const scoreDisplay = document.getElementById("score");
const missesDisplay = document.getElementById("misses");
const finalScore = document.getElementById("final-score");
const finalMisses = document.getElementById("final-misses");
const message = document.getElementById("message");

let state = "waiting";
let currentKey = "";
let score = 0;
let misses = 0;
let keyX = 0;
let keyY = 0;
let previousFrameTime = 0;
let finishTime = 0;
let animationId = 0;
let countdownTimerId = 0;

document.addEventListener("keydown", handleKeydown);

function handleKeydown(event) {
  if (event.code === "Space" && (state === "waiting" || state === "finished")) {
    event.preventDefault();
    startCountdown();
    return;
  }

  if (state !== "playing" || event.repeat || event.ctrlKey || event.altKey || event.metaKey) {
    return;
  }

  const typedKey = event.key.toLowerCase();

  if (typedKey === currentKey) {
    score += 1;
    scoreDisplay.textContent = score;
    showNextKey();
    return;
  }

  if (event.key.length === 1) {
    misses += 1;
    missesDisplay.textContent = misses;
  }
}

function startCountdown() {
  clearTimeout(countdownTimerId);
  cancelAnimationFrame(animationId);
  state = "countdown";
  score = 0;
  misses = 0;
  timeDisplay.textContent = PRACTICE_TIME;
  scoreDisplay.textContent = score;
  missesDisplay.textContent = misses;
  startPanel.hidden = true;
  resultPanel.hidden = true;
  fallingKey.hidden = true;
  countdown.hidden = false;
  message.textContent = "カウントダウン中です";

  const labels = ["3", "2", "1", "START"];
  let index = 0;

  const showCount = () => {
    countdown.textContent = labels[index];
    index += 1;

    if (index < labels.length) {
      countdownTimerId = window.setTimeout(showCount, 1000);
    } else {
      countdownTimerId = window.setTimeout(beginPractice, 700);
    }
  };

  showCount();
}

function beginPractice() {
  state = "playing";
  countdown.hidden = true;
  message.textContent = "表示された文字と同じキーを押してください";
  finishTime = performance.now() + PRACTICE_TIME * 1000;
  previousFrameTime = performance.now();
  showNextKey();
  animationId = requestAnimationFrame(update);
}

function showNextKey() {
  currentKey = PRACTICE_KEYS[Math.floor(Math.random() * PRACTICE_KEYS.length)];
  fallingKey.textContent = currentKey.toUpperCase();
  fallingKey.hidden = false;

  const sideMargin = 18;
  const maxX = Math.max(sideMargin, playArea.clientWidth - fallingKey.offsetWidth - sideMargin);
  keyX = sideMargin + Math.random() * (maxX - sideMargin);
  keyY = 54;
  drawKey();
}

function update(now) {
  if (state !== "playing") {
    return;
  }

  const remainingMilliseconds = finishTime - now;
  if (remainingMilliseconds <= 0) {
    finishPractice();
    return;
  }

  timeDisplay.textContent = Math.ceil(remainingMilliseconds / 1000);

  const elapsedSeconds = Math.min((now - previousFrameTime) / 1000, 0.1);
  const bottomMargin = 20;
  const maxY = playArea.clientHeight - fallingKey.offsetHeight - bottomMargin;
  keyY = Math.min(keyY + FALL_SPEED * elapsedSeconds, maxY);
  previousFrameTime = now;
  drawKey();

  animationId = requestAnimationFrame(update);
}

function drawKey() {
  fallingKey.style.transform = `translate(${keyX}px, ${keyY}px)`;
}

function finishPractice() {
  state = "finished";
  cancelAnimationFrame(animationId);
  timeDisplay.textContent = "0";
  fallingKey.hidden = true;
  finalScore.textContent = score;
  finalMisses.textContent = misses;
  resultPanel.hidden = false;
  message.textContent = "ホームポジションに手を置き、Spaceキーでもう一度練習できます";
}