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【先生の神ツール】算数・国語の板書準備が秒で終わる「究極支援ホワイトボードアプリ」を作りました!

    こんにちは!むん先生です。

    注意!!
    アプリのコードについての無断転載や利用・公開は、一切禁止です。

    GIGAスクール構想で1人1台端末が当たり前になりましたが、先生方、こんなお悩みはありませんか?

    「算数のテープ図やグラフを画面で作るのが面倒…」 「国語の原稿用紙や縦書きが、標準のホワイトボードアプリだと使いにくい…」 「めあてやまとめの枠を、毎回図形で囲んで作っている…」

    そんな現場の「ちょっとした、でも毎日のストレス」を解消するために、算数と国語の授業に特化した「究極支援ホワイトボードアプリ」を自作しました!

    今回は、このアプリの「かゆいところに手が届く」こだわりの機能たちをたっぷり紹介させてください。

    その前に・・・別の記事はこちら

    学習アプリを一括で使いたい方はこちら



    📐 1. 算数の準備が秒で終わる!最強の算数ツール

    このアプリの一番の目玉は、算数の図表が「数値を入力するだけ」で一瞬で完成する機能です。

    ① 自動計算される「テープ図作成」機能

    テープ図って、四角形を組み合わせて長さを調整して…と作るのが本当に大変ですよね。 このアプリなら、「名前」と「数値」を入力するだけで、長さを自動計算して正確なテープ図を描画してくれます。 全体の数や、差分のアーク(点線)も自動で入ります!

    [ここにテープ図作成モーダルと、完成したテープ図のスクショを挿入]

    ② メモリも正確!「グラフ作成」機能

    項目と数値を入力するだけで、棒グラフが一瞬で完成します。 縦軸の最大値やメモリの間隔(10刻みなど)も自由自在。もう、Excelで作ったグラフをスクショして貼り付ける必要はありません!

    [ここにグラフ作成画面と、完成した棒グラフのスクショを挿入]

    ③ デジタル教具(定規・分度器・アレイ図)

    画面上で動かせる透過仕様の「15cm定規」「分度器」「三角定規」をワンクリックで呼び出せます。さらに、かけ算の導入で必須の「アレイ図(🍎)」も、縦横の数を入力するだけで瞬時に整列して表示されます。

    [ここに定規やアレイ図を使っている画面のスクショを挿入]

    📝 2. Word顔負け!?国語の表現を支えるツール

    国語の授業でネックになる「原稿用紙」や「縦書き」も、究極まで使いやすくしました。

    ① 自動流し込み!「原稿用紙作成」機能

    ただの原稿用紙の背景ではありません。 テキストボックスに文章(作文など)を打ち込むと、自動で1文字ずつマス目に配置してくれます。 100字、200字、300字、400字詰めにワンタッチで対応。さらに、「、」や「。」などの句読点をマス目の右上に寄せる細かな配慮もプログラミングしてあります!

    [ここに原稿用紙作成画面と、文字がマス目に入ったスクショを挿入]

    ② 縦書き・横書きのシームレス切り替え

    もちろん、通常のテキストも「横書き・縦書き」をワンタッチで切り替え可能です。背景を「縦罫線」にすれば、あっという間に国語のノートに変身します。

    🏫 3. 授業の進行をスムーズにする「先生のお助け機能」

    実際の授業での使い勝手をとことん追求し、授業運営を助ける機能を盛り込みました。

    ① 「めあて」「まとめ」等の自動リサイズ枠

    板書で必ず使う「問」「学」「め」「ま」「ポ」「適」「考」「ふ」の枠ボタンを用意しました。 テキストを打ち込むと、文字数に合わせて枠のサイズが自動で広がります。もう、文字が枠からはみ出すストレスとは無縁です!

    [ここにめあて枠やまとめ枠のスクショを挿入]

    ② 児童の状況が一目でわかる「SOSボタン」

    画面右下に、児童が自分の状況をアピールできるボタンを実装しました。

    • 🟢 順調

    • 🟡 考え中

    • 🔴 助けて(画面全体が赤く点滅!) これがあることで、机間巡視の際にどの子のサポートに入ればいいか一目でわかります。

    [ここにSOSボタンの色が変わっている様子のスクショを挿入]

    ③ 多言語対応ふせん(日本語・モンゴル語)

    外国にルーツを持つ児童への支援として、ワンクリックで「日本語 / モンゴル語」の併記ができる専用ふせんも用意しました。(※ここは先生のクラスの実態に合わせて言語をカスタマイズ可能です!)

    💾 4. 基本機能も妥協なし!

    • タイマー機能内蔵: 画面上部でサクッと時間を測れます。

    • ピタッと整列機能: 図形や枠がグリッドに吸着し、板書が綺麗にまとまります。

    • 複数ページ&一覧表示: ページを追加でき、「👀 一覧」ボタンで全ページをギャラリー表示できます。

    • ローカル保存機能: ブラウザ内にデータを保存・読み込み可能。ネット環境が不安定でも安心です。

    • 画像(PNG)書き出し: 児童のポートフォリオや、先生の板書記録としてワンクリックで画像保存できます。

    最後に

    「こんな機能があったらいいな」という現場の声を、コードを書いてすべて詰め込んでみました。 既存のツールで「ここがもうちょっとこうなれば…」とモヤモヤしている先生方に、このアプリのアイデアが少しでも参考になれば嬉しいです。

    「この機能、どうやって実装してるの?」「自分のクラスでも使ってみたい!」などがありましたら、ぜひスキ❤️やコメントをお願いします!反響があれば、詳しいコードの解説や、実際にブラウザで使えるリンクの公開も検討したいと思います。

    全国の先生方、毎日の授業準備、本当にお疲れ様です!一緒にICTを駆使して、子どもたちにとっても先生にとっても楽しい授業を作っていきましょう!

    ダウンロードとコードはこちら

    <!DOCTYPE html>
    <html lang="ja">
    
    <head>
      <meta charset="UTF-8">
      <title>ホワイトボードアプリ(算数・国語 究極支援版)</title>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/5.3.1/fabric.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js"></script>
      <style>
        body {
          font-family: sans-serif;
          margin: 0;
          padding: 10px;
          background-color: #f4f4f9;
          text-align: center;
        }
    
        .btn-base {
          padding: 6px 10px;
          font-size: 13px;
          font-weight: bold;
          border: none;
          border-radius: 4px;
          cursor: pointer;
          color: white;
          margin: 2px;
          box-shadow: 0 2px 2px rgba(0, 0, 0, 0.1);
        }
    
        .btn-base:active {
          transform: translateY(1px);
          box-shadow: none;
        }
    
        .toolbar {
          display: flex;
          gap: 4px;
          justify-content: center;
          margin-bottom: 8px;
          padding: 8px;
          background: white;
          border-radius: 8px;
          box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
          flex-wrap: wrap;
          align-items: center;
        }
    
        select,
        input[type="number"],
        input[type="checkbox"],
        input[type="text"],
        textarea {
          padding: 4px;
          border: 1px solid #ccc;
          border-radius: 4px;
          font-size: 13px;
          cursor: pointer;
          margin: 2px;
          vertical-align: middle;
        }
    
        .color-btn {
          display: inline-block;
          width: 22px;
          height: 22px;
          border-radius: 50%;
          cursor: pointer;
          border: 2px solid #ccc;
          vertical-align: middle;
          margin: 0 2px;
        }
    
        .color-btn.active {
          border: 2px solid #ff9800;
          transform: scale(1.2);
        }
    
        .btn-blue {
          background-color: #007bff;
        }
    
        .btn-red {
          background-color: #dc3545;
        }
    
        .btn-yellow {
          background-color: #ffca28;
          color: #333;
        }
    
        .btn-purple {
          background-color: #9c27b0;
        }
    
        .btn-gray {
          background-color: #6c757d;
        }
    
        .btn-green {
          background-color: #28a745;
        }
    
        .btn-orange {
          background-color: #fd7e14;
        }
    
        .btn-dark {
          background-color: #343a40;
        }
    
        .btn-teal {
          background-color: #20c997;
        }
    
        #page-list-container {
          display: inline-flex;
          max-width: 200px;
          overflow-x: auto;
          white-space: nowrap;
          padding-bottom: 4px;
          align-items: center;
        }
    
        #page-list-container::-webkit-scrollbar {
          height: 6px;
        }
    
        #page-list-container::-webkit-scrollbar-thumb {
          background: #ccc;
          border-radius: 3px;
        }
    
        .page-btn {
          background-color: #e0e0e0;
          color: #333;
          border: 1px solid #ccc;
          padding: 4px 8px;
          font-size: 13px;
          border-radius: 4px;
          cursor: pointer;
          margin: 0 2px;
        }
    
        .page-btn.active {
          background-color: #007bff;
          color: white;
          border-color: #007bff;
        }
    
        #canvas-wrapper {
          width: 100%;
          height: 78vh;
          overflow: auto;
          border: 2px solid #ccc;
          background-color: white;
          border-radius: 8px;
          position: relative;
        }
    
        #sos-button {
          position: fixed;
          bottom: 20px;
          right: 20px;
          width: 60px;
          height: 60px;
          border-radius: 50%;
          background-color: #28a745;
          color: white;
          font-size: 12px;
          font-weight: bold;
          border: 4px solid white;
          box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
          cursor: pointer;
          z-index: 1000;
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          transition: 0.3s;
        }
    
        #sos-button.sos-thinking {
          background-color: #ffca28;
          color: #333;
        }
    
        #sos-button.sos-help {
          background-color: #dc3545;
          animation: pulse 1.5s infinite;
        }
    
        @keyframes pulse {
          0% {
            transform: scale(1);
            box-shadow: 0 0 0 0 rgba(220, 53, 69, 0.7);
          }
    
          70% {
            transform: scale(1.1);
            box-shadow: 0 0 0 15px rgba(220, 53, 69, 0);
          }
    
          100% {
            transform: scale(1);
            box-shadow: 0 0 0 0 rgba(220, 53, 69, 0);
          }
        }
    
        /* モーダル共通 */
        #gallery-modal,
        #save-load-modal,
        #graph-builder-modal,
        #tape-builder-modal,
        #ms-builder-modal {
          display: none;
          position: fixed;
          top: 0;
          left: 0;
          width: 100vw;
          height: 100vh;
          background: rgba(0, 0, 0, 0.8);
          z-index: 2000;
          overflow-y: auto;
          padding: 20px;
          box-sizing: border-box;
          text-align: left;
        }
    
        .modal-content {
          background: white;
          padding: 20px;
          border-radius: 8px;
          max-width: 650px;
          margin: 4vh auto;
          max-height: 85vh;
          overflow-y: auto;
          box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
    
        .gallery-item {
          position: relative;
          background: white;
          padding: 10px;
          border-radius: 8px;
          margin-bottom: 20px;
          display: inline-block;
          width: 350px;
          margin-right: 20px;
          vertical-align: top;
          border: 4px solid transparent;
          transition: 0.3s;
          cursor: pointer;
        }
    
        .gallery-item:hover {
          transform: scale(1.05);
        }
    
        .gallery-item img {
          width: 100%;
          border: 1px solid #ccc;
          border-radius: 4px;
          background-color: white;
        }
    
        .save-item {
          display: flex;
          justify-content: space-between;
          align-items: center;
          padding: 15px;
          border-bottom: 1px solid #eee;
        }
    
        .graph-item-row {
          display: flex;
          gap: 8px;
          margin-bottom: 8px;
          align-items: center;
          background: #f8f9fa;
          padding: 8px;
          border-radius: 4px;
        }
    
        .graph-item-row input[type="text"] {
          width: 130px;
        }
    
        .graph-item-row input[type="number"] {
          width: 75px;
          text-align: right;
        }
    
        .graph-item-row input[type="color"] {
          width: 35px;
          height: 30px;
          padding: 0;
          cursor: pointer;
        }
      </style>
    </head>
    
    <body>
    
      <div id="whiteboard-screen">
        <div class="toolbar">
          <select id="bgSelect" onchange="changeBackground()">
            <option value="white">⬜ 白紙</option>
            <option value="grid">▦ 方眼</option>
            <option value="ruled">⏸ 縦罫線</option>
            <option value="blackboard">🟩 黒板</option>
          </select>
    
          <select id="textDirection">
            <option value="h">➡ 横書き</option>
            <option value="v">⬇ 縦書き</option>
          </select>
          <select id="fontSizeSelect" onchange="changeFontSize()">
            <option value="16">小(16)</option>
            <option value="24" selected>中(24)</option>
            <option value="36">大(36)</option>
          </select>
    
          <select id="tool" onchange="changeTool()">
            <option value="select">👆 えらぶ</option>
            <option value="draw">✎ ペン</option>
            <option value="highlight">🖍 蛍光ペン</option>
            <option value="text">A もじ</option>
            <option value="line">📏 直線</option>
            <option value="rect">▭ 四角</option>
            <option value="circle">◯ 丸</option>
          </select>
    
          <span style="display:inline-flex; align-items:center; gap:2px; margin:0 5px;">
            <span class="color-btn active" style="background:#000000;" onclick="setColor('#000000', this)"></span>
            <span class="color-btn" style="background:#dc3545;" onclick="setColor('#dc3545', this)"></span>
            <span class="color-btn" style="background:#007bff;" onclick="setColor('#007bff', this)"></span>
            <span class="color-btn" style="background:#ffffff;" onclick="setColor('#ffffff', this)" title="白(黒板用)"></span>
          </span>
    
          <span style="border-left: 2px solid #ccc; margin: 0 5px; height: 30px;"></span>
    
          <span style="font-weight: bold; font-size: 13px; color: #333;">P:</span>
          <div id="page-list-container"><span id="page-list"></span></div>
          <button id="addPageBtn" class="btn-base btn-teal">+1枚</button>
    
          <span style="border-left: 2px solid #ccc; margin: 0 5px; height: 30px;"></span>
    
          <span style="font-size: 13px; color: #333; display: flex; align-items: center; gap: 2px;">
            ⏱ <input type="number" id="timerMin" value="3" style="width: 40px; text-align: right;" min="1">分
            <button id="startTimerBtn" class="btn-base btn-orange" onclick="startTimer()" style="padding: 2px 8px;">▶</button>
            <span id="timerDisplay" style="font-weight: bold; width: 45px; text-align: center; font-family: monospace;">03:00</span>
          </span>
    
          <span style="border-left: 2px solid #ccc; margin: 0 5px; height: 30px;"></span>
          <label style="font-size: 12px; cursor: pointer; font-weight:bold; background:#e0e0e0; padding:4px 8px; border-radius:4px;">
            <input type="checkbox" id="snapGridToggle"> 🧲 ピタッと整列
          </label>
        </div>
    
        <!-- 枠・ふせん・基本ツール -->
        <div class="toolbar">
          <button class="btn-base btn-dark" onclick="createBoardFrame('問')">問 枠</button>
          <button class="btn-base btn-blue" onclick="createBoardFrame('学')">学 枠</button>
          <button class="btn-base btn-red" onclick="createBoardFrame('め')">め 枠</button>
          <button class="btn-base btn-red" onclick="createBoardFrame('ま')">ま 枠</button>
          <button class="btn-base btn-red" onclick="createBoardFrame('ポ')">ポ 枠</button>
          <button class="btn-base btn-green" onclick="createBoardFrame('適')">適 枠</button>
          <button class="btn-base btn-purple" onclick="createBoardFrame('考')">考 枠</button>
          <button class="btn-base btn-orange" onclick="createBoardFrame('ふ')">ふ 枠</button>
    
          <span style="border-left: 2px solid #ccc; margin: 0 5px; height: 30px;"></span>
          <input type="file" id="cameraInput" accept="image/*" style="display:none;" onchange="handleImageUpload(event)">
          <button class="btn-base btn-yellow" onclick="document.getElementById('cameraInput').click()">📸 画像</button>
          <button class="btn-base btn-yellow" onclick="addSticky()">📝 ふせん</button>
          <button class="btn-base btn-blue" onclick="addBiLingualSticky()">📝 日/モ</button>
    
          <span style="border-left: 2px solid #ccc; margin: 0 5px; height: 30px;"></span>
          <button class="btn-base btn-gray" onclick="bringToFront()" title="一番手前に移動">⬆️ 前</button>
          <button class="btn-base btn-gray" onclick="sendToBack()" title="一番奥に移動">⬇️ 奥</button>
          <button class="btn-base btn-gray" onclick="toggleLock()" title="動かせなくする">🔒 固定</button>
          <button class="btn-base btn-red" onclick="deleteSelected()">けす</button>
          <button class="btn-base btn-gray" onclick="restoreDeleted()">🗑️ 戻す</button>
        </div>
    
        <!-- 算数・国語 特化ツールバー -->
        <div class="toolbar" style="background:#e3f2fd; border: 2px solid #90caf9;">
          <span style="font-weight:bold; font-size:13px; color:#1e88e5;">算数・国語ツール:</span>
          <button class="btn-base btn-blue" onclick="spawnMathTool('ruler')">📏 15cm定規</button>
          <button class="btn-base btn-blue" onclick="spawnMathTool('protractor')">📐 分度器</button>
          <button class="btn-base btn-blue" onclick="spawnMathTool('tri-iso')">🔺 二等辺</button>
          <button class="btn-base btn-blue" onclick="spawnMathTool('tri-right')">📐 直角</button>
    
          <span style="border-left: 2px solid #90caf9; margin: 0 5px; height: 20px;"></span>
    
          <button class="btn-base btn-green" onclick="openTapeBuilder()">📼 テープ図作成</button>
          <button class="btn-base btn-green" onclick="openGraphBuilder()">📊 グラフ作成</button>
          <button class="btn-base btn-orange" onclick="spawnMathTool('array')">🍎 アレイ図</button>
          <button class="btn-base btn-purple" onclick="openMSBuilder()">📝 原稿用紙作成</button>
    
          <span style="border-left: 2px solid #90caf9; margin: 0 5px; height: 20px;"></span>
          <button id="viewGalleryBtn" class="btn-base btn-dark">👀 一覧</button>
          <button id="saveDataBtn" class="btn-base btn-dark">💾 保存</button>
          <button id="loadDataBtn" class="btn-base btn-dark">📂 開く</button>
          <button class="btn-base btn-dark" onclick="exportPNG()">🖼️ PNG</button>
          <button id="clearBtn" class="btn-base btn-gray">全消去</button>
        </div>
    
        <div id="canvas-wrapper">
          <canvas id="canvas" width="2000" height="1500"></canvas>
        </div>
      </div>
    
      <button id="sos-button" onclick="toggleSOS()">
        <span id="sos-icon" style="font-size:24px;">🟢</span>
        <span id="sos-text">順調</span>
      </button>
    
      <!-- ================= グラフ作成モーダル ================= -->
      <div id="graph-builder-modal">
        <div class="modal-content">
          <div style="display: flex; justify-content: space-between; align-items: center; border-bottom: 2px solid #007bff; padding-bottom: 10px; margin-bottom: 15px;">
            <h2 style="margin: 0; color: #007bff;">📊 グラフ設定・作成ツール</h2>
            <button onclick="closeGraphBuilder()" class="btn-base btn-gray" style="font-size:16px;">閉じる</button>
          </div>
    
          <div style="display: flex; gap: 15px; margin-bottom: 15px; background: #e9ecef; padding: 15px; border-radius: 8px;">
            <div>
              <label style="font-weight: bold; font-size: 13px;">縦軸の最大値:</label><br>
              <input type="text" id="g-max" value="60" style="width: 70px; text-align: right;">
            </div>
            <div>
              <label style="font-weight: bold; font-size: 13px;">メモリ間隔:</label><br>
              <input type="text" id="g-step" value="10" style="width: 70px; text-align: right;">
            </div>
            <div>
              <label style="font-weight: bold; font-size: 13px;">グラフ名:</label><br>
              <input type="text" id="g-title" value="じゅもん・くだもの調べ" style="width: 150px;">
            </div>
          </div>
    
          <h3 style="font-size: 15px; border-bottom: 1px solid #ccc; padding-bottom: 5px;">項目と数値データ</h3>
          <div id="graph-items-container"></div>
          <div style="margin-top: 10px;">
            <button class="btn-base btn-green" onclick="addGraphItemRow()">+ データを追加</button>
          </div>
    
          <div style="text-align: right; margin-top: 20px; border-top: 2px solid #ccc; padding-top: 15px;">
            <button class="btn-base btn-blue" style="font-size: 15px; padding: 10px 20px;" onclick="generateAdvancedGraph()">✨ グラフを描画する</button>
          </div>
        </div>
      </div>
    
      <!-- ================= テープ図作成モーダル ================= -->
      <div id="tape-builder-modal">
        <div class="modal-content">
          <div style="display: flex; justify-content: space-between; align-items: center; border-bottom: 2px solid #28a745; padding-bottom: 10px; margin-bottom: 15px;">
            <h2 style="margin: 0; color: #28a745;">📼 テープ図作成・設定ツール</h2>
            <button onclick="closeTapeBuilder()" class="btn-base btn-gray" style="font-size:16px;">閉じる</button>
          </div>
    
          <div style="background: #e8f5e9; padding: 15px; border-radius: 8px; margin-bottom: 15px;">
            <div style="margin-bottom: 10px;">
              <label style="font-weight:bold; font-size:13px;">上のテープ (名前):</label>
              <input type="text" id="t-name1" value="ねこ" style="width: 100px;">
              <label style="font-weight:bold; font-size:13px; margin-left:10px;">数値(長さ/数量):</label>
              <input type="text" id="t-val1" value="15" style="width: 70px; text-align: right;">ひき
            </div>
            <div>
              <label style="font-weight:bold; font-size:13px;">下のテープ (名前):</label>
              <input type="text" id="t-name2" value="いぬ" style="width: 100px;">
              <label style="font-weight:bold; font-size:13px; margin-left:10px;">数値(長さ/数量):</label>
              <input type="text" id="t-val2" value="11" style="width: 70px; text-align: right;">ひき
            </div>
          </div>
    
          <div style="display: flex; gap: 15px; margin-bottom: 15px; background: #f1f8e9; padding: 12px; border-radius: 8px;">
            <div>
              <label style="font-weight:bold; font-size:13px;">全体・上アーク表示:</label>
              <input type="text" id="t-top-label" value="15ひき" style="width: 120px;" placeholder="例: 15ひき (空欄可)">
            </div>
            <div>
              <label style="font-weight:bold; font-size:13px;">差・右下アーク表示:</label>
              <input type="text" id="t-right-label" value="4ひき" style="width: 120px;" placeholder="例: 4ひき (空欄可)">
            </div>
          </div>
    
          <div style="text-align: right; border-top: 2px solid #ccc; padding-top: 15px;">
            <button class="btn-base btn-green" style="font-size: 15px; padding: 10px 20px;" onclick="generateTapeDiagram()">✨ テープ図を描画する</button>
          </div>
        </div>
      </div>
    
      <!-- ================= 原稿用紙作成モーダル ================= -->
      <div id="ms-builder-modal">
        <div class="modal-content">
          <div style="display: flex; justify-content: space-between; align-items: center; border-bottom: 2px solid #9c27b0; padding-bottom: 10px; margin-bottom: 15px;">
            <h2 style="margin: 0; color: #9c27b0;">📝 原稿用紙・文字入力ツール</h2>
            <button onclick="closeMSBuilder()" class="btn-base btn-gray" style="font-size:16px;">閉じる</button>
          </div>
    
          <div style="margin-bottom: 15px; background: #f3e5f5; padding: 15px; border-radius: 8px;">
            <label style="font-weight: bold; font-size: 14px;">原稿用紙の種類を選んでください:</label><br>
            <select id="ms-type" style="padding: 6px; font-size: 14px; margin-top: 5px;">
              <option value="100">100文字原稿用紙 (10×10)</option>
              <option value="200">200文字原稿用紙 (10×20)</option>
              <option value="300">300文字原稿用紙 (15×20)</option>
              <option value="400" selected>400文字原稿用紙 (20×20)</option>
            </select>
          </div>
    
          <div style="margin-bottom: 15px;">
            <label style="font-weight: bold; font-size: 14px;">文章を入力してください(Wordのように自動でマスに入ります):</label><br>
            <textarea id="ms-text" rows="5" style="width: 100%; box-sizing: border-box; padding: 8px; font-size: 16px;" placeholder="ここに作文や感想などを入力してください。改行もそのままマスに反映されます。"></textarea>
          </div>
    
          <div style="text-align: right; border-top: 2px solid #ccc; padding-top: 15px;">
            <button class="btn-base btn-purple" style="font-size: 15px; padding: 10px 20px;" onclick="generateGenkoYoshi()">✨ 原稿用紙を配置する</button>
          </div>
        </div>
      </div>
    
      <div id="gallery-modal">
        <div class="modal-content" style="max-width: 90%; text-align: center;">
          <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px;">
            <h2 style="margin: 0;">👀 全ページ一覧</h2>
            <button id="closeGalleryBtn" class="btn-base btn-gray" style="font-size:20px; padding:10px 20px;">閉じる</button>
          </div>
          <div id="gallery-grid"></div>
        </div>
      </div>
    
      <div id="save-load-modal">
        <div class="modal-content">
          <div style="display: flex; justify-content: space-between; align-items: center; border-bottom: 2px solid #ccc; padding-bottom: 10px; margin-bottom: 10px;">
            <h2 style="margin: 0; color: #333;">📂 保存された履歴一覧</h2>
            <button onclick="document.getElementById('save-load-modal').style.display = 'none'" class="btn-base btn-gray" style="font-size:16px;">閉じる</button>
          </div>
          <div id="save-list"></div>
        </div>
      </div>
    
      <script>
        let canvas;
        let currentPage = 1;
        let maxPage = 1;
        let currentColor = '#000000';
        let trashBin = [];
        let isDrawingShape = false;
        let origX, origY, currentShape;
        let timerInterval;
        let localPagesData = {};
        let sosState = 0;
        const SAVES_KEY = 'edu_whiteboard_saves_list';
    
        function getEl(id) {
          return document.getElementById(id);
        }
    
        function generateId() {
          return Date.now().toString(36) + Math.random().toString(36).substr(2, 5);
        }
        // 全角数字を半角数字に安全に変換するヘルパー関数
        function toHalfWidth(str) {
          if (!str) return '';
          return str.replace(/[0-9]/g, function(s) {
            return String.fromCharCode(s.charCodeAt(0) - 0xFEE0);
          });
        }
        const customProps = ['linkedId', 'linkRole', 'relX', 'relY', 'isVerticalText', 'minW', 'minH', 'objectId', 'lockMovementX', 'lockMovementY', 'lockRotation', 'lockScalingX', 'lockScalingY', 'hasControls', 'strokeUniform'];
        const bgGrid = 'data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40"><rect width="40" height="40" fill="%23ffffff"/><path d="M 40 0 L 0 0 0 40" fill="none" stroke="%23e0e0e0" stroke-width="1"/></svg>';
        const bgRuled = 'data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40"><rect width="40" height="40" fill="%23ffffff"/><path d="M 39 0 L 39 40" fill="none" stroke="%23cccccc" stroke-width="1"/></svg>';
        window.addEventListener('DOMContentLoaded', () => {
          initCanvas();
          renderPageButtons();
          getEl('addPageBtn').addEventListener('click', addPage);
          getEl('clearBtn').addEventListener('click', clearAll);
          getEl('saveDataBtn').addEventListener('click', saveAsDataLocally);
          getEl('loadDataBtn').addEventListener('click', openLoadModal);
          getEl('viewGalleryBtn').addEventListener('click', openGallery);
          getEl('closeGalleryBtn').addEventListener('click', () => getEl('gallery-modal').style.display = 'none');
        });
    
        function initCanvas() {
          canvas = new fabric.Canvas('canvas', {
            isDrawingMode: false,
            preserveObjectStacking: true,
            backgroundColor: '#ffffff'
          });
          getEl('tool').value = 'select';
          canvas.on('object:moving', function(options) {
            if (getEl('snapGridToggle').checked) {
              const gridSize = 40;
              options.target.set({
                left: Math.round(options.target.left / gridSize) * gridSize,
                top: Math.round(options.target.top / gridSize) * gridSize
              });
            }
          });
          canvas.on('mouse:move', (options) => {
            const tool = getEl('tool').value;
            if (isDrawingShape && currentShape) {
              let pointer = canvas.getPointer(options.e);
              if (tool === 'line') {
                currentShape.set({
                  x2: pointer.x,
                  y2: pointer.y
                });
              } else if (tool === 'rect') {
                currentShape.set({
                  width: Math.abs(origX - pointer.x),
                  height: Math.abs(origY - pointer.y)
                });
                if (origX > pointer.x) currentShape.set({
                  left: pointer.x
                });
                if (origY > pointer.y) currentShape.set({
                  top: pointer.y
                });
              } else if (tool === 'circle') {
                let radius = Math.abs(origX - pointer.x) / 2;
                currentShape.set({
                  radius: radius
                });
                if (origX > pointer.x) currentShape.set({
                  left: pointer.x
                });
                if (origY > pointer.y) currentShape.set({
                  top: pointer.y
                });
              }
              canvas.renderAll();
            }
          });
          canvas.on('mouse:down', (options) => {
            const tool = getEl('tool').value;
            const pointer = canvas.getPointer(options.e);
            if (['line', 'rect', 'circle'].includes(tool)) {
              isDrawingShape = true;
              origX = pointer.x;
              origY = pointer.y;
              if (tool === 'line') currentShape = new fabric.Line([origX, origY, origX, origY], {
                stroke: currentColor,
                strokeWidth: 4,
                objectId: generateId()
              });
              else if (tool === 'rect') currentShape = new fabric.Rect({
                left: origX,
                top: origY,
                width: 0,
                height: 0,
                fill: 'transparent',
                stroke: currentColor,
                strokeWidth: 4,
                objectId: generateId()
              });
              else if (tool === 'circle') currentShape = new fabric.Circle({
                left: origX,
                top: origY,
                radius: 0,
                fill: 'transparent',
                stroke: currentColor,
                strokeWidth: 4,
                objectId: generateId()
              });
              canvas.add(currentShape);
            } else if (tool === 'text' && !canvas.isDrawingMode) {
              const isVertical = (getEl('textDirection').value === 'v');
              const fontSize = parseInt(getEl('fontSizeSelect').value, 10);
              const opts = {
                left: pointer.x,
                top: pointer.y,
                fill: currentColor,
                fontSize: fontSize,
                objectId: generateId()
              };
              let textObj = isVertical ? new fabric.Textbox('ここに入力', {
                ...opts,
                splitByGrapheme: true,
                width: fontSize + 10,
                isVerticalText: true
              }) : new fabric.IText('ここに入力', opts);
              canvas.add(textObj);
              canvas.setActiveObject(textObj);
              textObj.enterEditing();
              textObj.selectAll();
              getEl('tool').value = 'select';
              canvas.isDrawingMode = false;
            }
          });
          canvas.on('mouse:up', () => {
            if (isDrawingShape && currentShape) {
              isDrawingShape = false;
              currentShape.setCoords();
              getEl('tool').value = 'select';
              currentShape = null;
            }
          });
          window.addEventListener('keydown', (e) => {
            if ((e.key === 'Delete' || e.key === 'Backspace') && e.target.tagName !== 'INPUT' && e.target.tagName !== 'TEXTAREA' && !canvas.getActiveObject()?.isEditing) {
              deleteSelected();
            }
          });
        }
        /* =========================================================================
           📏 定規・分度器・図形ツール生成
        ========================================================================= */
        function spawnMathTool(type) {
          if (!canvas) return;
          const offset = getScrollOffset();
          let cx = offset.x + 100;
          let cy = offset.y + 100;
          let toolFill = 'rgba(173, 216, 230, 0.3)';
          let toolStroke = 'rgba(0, 100, 200, 0.8)';
          if (type === 'ruler') {
            // 正確な15cm定規 (1cm = 40px, 全長640px)
            let groupItems = [];
            let cmWidth = 40;
            let totalWidth = 15 * cmWidth + 40;
            let base = new fabric.Rect({
              left: 0,
              top: 0,
              width: totalWidth,
              height: 60,
              fill: toolFill,
              stroke: toolStroke,
              strokeWidth: 1,
              rx: 4,
              ry: 4
            });
            groupItems.push(base);
            for (let i = 0; i <= 150; i++) {
              let x = 20 + i * (cmWidth / 10);
              let isMajor = i % 10 === 0;
              let isMid = i % 5 === 0;
              let h = isMajor ? 25 : (isMid ? 15 : 8);
              groupItems.push(new fabric.Line([x, 0, x, h], {
                stroke: toolStroke,
                strokeWidth: 1
              }));
              if (isMajor) {
                let num = i / 10;
                let txt = new fabric.Text(num.toString(), {
                  left: x,
                  top: 35,
                  fontSize: 16,
                  fill: toolStroke,
                  originX: 'center',
                  originY: 'center',
                  fontFamily: 'sans-serif'
                });
                groupItems.push(txt);
              }
            }
            let group = new fabric.Group(groupItems, {
              left: cx,
              top: cy,
              objectId: generateId()
            });
            canvas.add(group);
            canvas.setActiveObject(group);
          } else if (type === 'protractor') {
            // 分度器(透ける半円)
            let groupItems = [];
            let r = 180;
            let basePath = new fabric.Path(`M 0 ${r} A ${r} ${r} 0 0 1 ${r*2} ${r} Z`, {
              fill: toolFill,
              stroke: toolStroke,
              strokeWidth: 1
            });
            let centerDot = new fabric.Circle({
              left: r - 3,
              top: r - 3,
              radius: 3,
              fill: 'red'
            });
            let baseline = new fabric.Line([10, r, r * 2 - 10, r], {
              stroke: toolStroke,
              strokeWidth: 1
            });
            let vertline = new fabric.Line([r, r, r, 20], {
              stroke: toolStroke,
              strokeWidth: 1
            });
            groupItems.push(basePath, centerDot, baseline, vertline);
            for (let i = 0; i <= 180; i += 5) {
              let angle = i * (Math.PI / 180);
              let isMajor = (i % 10 === 0);
              let tickLen = isMajor ? 20 : 10;
              let x1 = r - r * Math.cos(angle);
              let y1 = r - r * Math.sin(angle);
              let x2 = r - (r - tickLen) * Math.cos(angle);
              let y2 = r - (r - tickLen) * Math.sin(angle);
              groupItems.push(new fabric.Line([x1, y1, x2, y2], {
                stroke: toolStroke,
                strokeWidth: 1
              }));
              if (isMajor) {
                let tx = r - (r - 38) * Math.cos(angle);
                let ty = r - (r - 38) * Math.sin(angle);
                let txt = new fabric.Text(i.toString(), {
                  left: tx,
                  top: ty,
                  fontSize: 11,
                  fill: toolStroke,
                  originX: 'center',
                  originY: 'center',
                  angle: 90 - i,
                  fontFamily: 'sans-serif'
                });
                groupItems.push(txt);
              }
            }
            let group = new fabric.Group(groupItems, {
              left: cx,
              top: cy,
              objectId: generateId()
            });
            canvas.add(group);
            canvas.setActiveObject(group);
          } else if (type === 'tri-iso') {
            let poly = new fabric.Polygon([{
              x: 0,
              y: 0
            }, {
              x: 200,
              y: 0
            }, {
              x: 0,
              y: 200
            }], {
              fill: toolFill,
              stroke: toolStroke,
              strokeWidth: 1
            });
            let group = new fabric.Group([poly], {
              left: cx,
              top: cy,
              objectId: generateId()
            });
            canvas.add(group);
            canvas.setActiveObject(group);
          } else if (type === 'tri-right') {
            let poly = new fabric.Polygon([{
              x: 0,
              y: 0
            }, {
              x: 173,
              y: 0
            }, {
              x: 0,
              y: 100
            }], {
              fill: toolFill,
              stroke: toolStroke,
              strokeWidth: 1
            });
            let group = new fabric.Group([poly], {
              left: cx,
              top: cy,
              objectId: generateId()
            });
            canvas.add(group);
            canvas.setActiveObject(group);
          } else if (type === 'array') {
            let rowInput = prompt("たてに いくつ ならべますか?(すうじ 例: 4)", "4");
            if (rowInput === null) return;
            let rows = parseInt(toHalfWidth(rowInput), 10);
            let colInput = prompt("よこに いくつ ならべますか?(すうじ 例: 5)", "5");
            if (colInput === null) return;
            let cols = parseInt(toHalfWidth(colInput), 10);
            if (isNaN(rows) || isNaN(cols) || rows <= 0 || cols <= 0) {
              alert("ただしい すうじを いれてください。");
              return;
            }
            let arrayItems = [];
            for (let r = 0; r < rows; r++) {
              for (let c = 0; c < cols; c++) {
                arrayItems.push(new fabric.Circle({
                  left: c * 35,
                  top: r * 35,
                  radius: 12,
                  fill: '#dc3545',
                  stroke: '#fff',
                  strokeWidth: 2
                }));
              }
            }
            let arrayGroup = new fabric.Group(arrayItems, {
              left: cx,
              top: cy,
              objectId: generateId()
            });
            canvas.add(arrayGroup);
            canvas.setActiveObject(arrayGroup);
          }
          getEl('tool').value = 'select';
          canvas.isDrawingMode = false;
        }
        /* =========================================================================
           📼 テープ図ビルダー (画像のように上下のテープと数値を自由に設定可能)
        ========================================================================= */
        function openTapeBuilder() {
          getEl('tape-builder-modal').style.display = 'block';
        }
    
        function closeTapeBuilder() {
          getEl('tape-builder-modal').style.display = 'none';
        }
    
        function generateTapeDiagram() {
          if (!canvas) return;
          let name1 = getEl('t-name1').value || 'ねこ';
          let val1 = parseFloat(toHalfWidth(getEl('t-val1').value)) || 15;
          let name2 = getEl('t-name2').value || 'いぬ';
          let val2 = parseFloat(toHalfWidth(getEl('t-val2').value)) || 11;
          let topLabel = getEl('t-top-label').value;
          let rightLabel = getEl('t-right-label').value;
          let offset = getScrollOffset();
          let startX = offset.x + 50;
          let startY = offset.y + 80;
          let groupItems = [];
          // 長さの割合を計算(大きい方を基準に最大300pxとする)
          let maxV = Math.max(val1, val2, 1);
          let len1 = (val1 / maxV) * 280;
          let len2 = (val2 / maxV) * 280;
          if (len1 < 80) len1 = 80;
          if (len2 < 80) len2 = 80;
          // 1段目ラベルとテープ
          groupItems.push(new fabric.Text(name1, {
            left: startX - 50,
            top: startY + 10,
            fontSize: 18,
            fill: '#333'
          }));
          groupItems.push(new fabric.Rect({
            left: startX,
            top: startY,
            width: len1,
            height: 36,
            fill: '#b3e5fc',
            stroke: '#333',
            strokeWidth: 2
          }));
          // 2段目ラベルとテープ
          let y2 = startY + 70;
          groupItems.push(new fabric.Text(name2, {
            left: startX - 50,
            top: y2 + 10,
            fontSize: 18,
            fill: '#333'
          }));
          groupItems.push(new fabric.Rect({
            left: startX,
            top: y2,
            width: len2,
            height: 36,
            fill: '#fff9c4',
            stroke: '#333',
            strokeWidth: 2
          }));
          // 上のアーク・ラベル (例: 15ひき)
          if (topLabel) {
            let topArcW = Math.max(len1, len2);
            groupItems.push(new fabric.Path(`M ${startX} ${startY} Q ${startX + topArcW/2} ${startY - 35} ${startX + topArcW} ${startY}`, {
              fill: 'transparent',
              stroke: '#555',
              strokeWidth: 1.5,
              strokeDashArray: [4, 3]
            }));
            groupItems.push(new fabric.Text(topLabel, {
              left: startX + topArcW / 2,
              top: startY - 35,
              fontSize: 18,
              fill: '#333',
              originX: 'center',
              originY: 'bottom'
            }));
          }
          // 右下の差分アーク・ラベル (例: 4ひき)
          if (rightLabel && len1 !== len2) {
            let minX = Math.min(startX + len1, startX + len2);
            let maxX = Math.max(startX + len1, startX + len2);
            // 点線境界
            groupItems.push(new fabric.Line([minX, startY + 36, minX, y2], {
              stroke: '#777',
              strokeWidth: 1.5,
              strokeDashArray: [3, 3]
            }));
            groupItems.push(new fabric.Path(`M ${minX} ${y2 + 36} Q ${minX + (maxX-minX)/2} ${y2 + 70} ${maxX} ${y2 + 36}`, {
              fill: 'transparent',
              stroke: '#555',
              strokeWidth: 1.5,
              strokeDashArray: [4, 3]
            }));
            groupItems.push(new fabric.Text(rightLabel, {
              left: minX + (maxX - minX) / 2,
              top: y2 + 50,
              fontSize: 18,
              fill: '#333',
              originX: 'center'
            }));
          }
          let tapeGroup = new fabric.Group(groupItems, {
            left: offset.x,
            top: offset.y,
            objectId: generateId()
          });
          canvas.add(tapeGroup);
          canvas.setActiveObject(tapeGroup);
          canvas.renderAll();
          closeTapeBuilder();
        }
        /* =========================================================================
           📊 グラフ作成ビルダー (全角数字対応&最大値・メモリ自由設定)
        ========================================================================= */
        function openGraphBuilder() {
          getEl('graph-builder-modal').style.display = 'block';
          const container = getEl('graph-items-container');
          if (container.children.length === 0) {
            addGraphItemRow('りんご', 50, '#5b9bd5');
            addGraphItemRow('みかん', 20, '#ed7d31');
            addGraphItemRow('バナナ', 15, '#a5a5a5');
            addGraphItemRow('トマト', 30, '#ffc000');
            addGraphItemRow('きゅうり', 10, '#4472c4');
            addGraphItemRow('レタス', 10, '#70ad47');
          }
        }
    
        function closeGraphBuilder() {
          getEl('graph-builder-modal').style.display = 'none';
        }
    
        function addGraphItemRow(name = '項目', val = 10, col = '#5b9bd5') {
          const div = document.createElement('div');
          div.className = 'graph-item-row';
          div.innerHTML = `
            <span style="font-size:13px; color:#555;">名前:</span>
            <input type="text" value="${name}">
            <span style="font-size:13px; color:#555; margin-left:5px;">数値:</span>
            <input type="text" value="${val}" style="width:65px; text-align:right;">
            <span style="font-size:13px; color:#555; margin-left:5px;">色:</span>
            <input type="color" value="${col}">
            <button class="btn-base btn-red" style="margin-left:auto; padding:4px 8px;" onclick="this.parentElement.remove()">削除</button>
          `;
          getEl('graph-items-container').appendChild(div);
        }
    
        function generateAdvancedGraph() {
          if (!canvas) return;
          // 全角数字を半角に変換して安全に数値化
          const maxVal = parseFloat(toHalfWidth(getEl('g-max').value)) || 60;
          const stepVal = parseFloat(toHalfWidth(getEl('g-step').value)) || 10;
          const rows = document.querySelectorAll('.graph-item-row');
          let data = [];
          rows.forEach(r => {
            data.push({
              name: r.children[1].value,
              val: parseFloat(toHalfWidth(r.children[3].value)) || 0,
              col: r.children[5].value
            });
          });
          if (data.length === 0) {
            alert('データがありません');
            return;
          }
          let groupItems = [];
          let barWidth = 55;
          let barSpacing = 35;
          let chartHeight = 320;
          let chartWidth = (data.length * (barWidth + barSpacing)) + 30;
          let scaleY = chartHeight / maxVal;
          // 背景フレーム
          groupItems.push(new fabric.Rect({
            left: 0,
            top: 0,
            width: chartWidth + 80,
            height: chartHeight + 120,
            fill: '#ffffff',
            stroke: 'transparent'
          }));
          // Y軸のメモリ・補助線 (0から最大値までstepVal刻みで正確に描画)
          for (let v = 0; v <= maxVal; v += stepVal) {
            let y = chartHeight - (v * scaleY) + 20;
            groupItems.push(new fabric.Line([60, y, 60 + chartWidth, y], {
              stroke: '#d9d9d9',
              strokeWidth: 1
            }));
            groupItems.push(new fabric.Text(v.toString(), {
              left: 50,
              top: y,
              fontSize: 16,
              fill: '#555',
              originX: 'right',
              originY: 'center',
              fontFamily: 'sans-serif'
            }));
          }
          // 軸線
          groupItems.push(new fabric.Line([60, 20, 60, chartHeight + 20], {
            stroke: '#7f7f7f',
            strokeWidth: 2
          }));
          groupItems.push(new fabric.Line([60, chartHeight + 20, 60 + chartWidth, chartHeight + 20], {
            stroke: '#7f7f7f',
            strokeWidth: 2
          }));
          // 棒と凡例の配置
          let legendY = chartHeight + 60;
          let legendStartX = 60 + ((chartWidth - (data.length * 85)) / 2);
          if (legendStartX < 60) legendStartX = 60;
          let currentLegendX = legendStartX;
          data.forEach((d, i) => {
            let x = 60 + barSpacing + (i * (barWidth + barSpacing));
            let h = d.val * scaleY;
            let y = chartHeight - h + 20;
            // 棒
            groupItems.push(new fabric.Rect({
              left: x - (barWidth / 2),
              top: y,
              width: barWidth,
              height: h,
              fill: d.col,
              stroke: '#333',
              strokeWidth: 1
            }));
            // 数値ラベル
            groupItems.push(new fabric.Text(d.val.toString(), {
              left: x,
              top: y - 10,
              fontSize: 16,
              fill: '#333',
              originX: 'center',
              originY: 'bottom',
              fontFamily: 'sans-serif'
            }));
            // 凡例
            groupItems.push(new fabric.Rect({
              left: currentLegendX,
              top: legendY,
              width: 14,
              height: 14,
              fill: d.col,
              stroke: '#333',
              strokeWidth: 1
            }));
            let lText = new fabric.Text(d.name, {
              left: currentLegendX + 20,
              top: legendY - 1,
              fontSize: 15,
              fill: '#333',
              fontFamily: 'sans-serif'
            });
            groupItems.push(lText);
            currentLegendX += 20 + lText.width + 15;
          });
          let offset = getScrollOffset();
          let graphGroup = new fabric.Group(groupItems, {
            left: offset.x,
            top: offset.y,
            objectId: generateId()
          });
          canvas.add(graphGroup);
          canvas.setActiveObject(graphGroup);
          canvas.renderAll();
          closeGraphBuilder();
        }
        /* =========================================================================
           📝 Word風 原稿用紙・文字自動配置ビルダー
        ========================================================================= */
        function openMSBuilder() {
          getEl('ms-builder-modal').style.display = 'block';
        }
    
        function closeMSBuilder() {
          getEl('ms-builder-modal').style.display = 'none';
        }
    
        function generateGenkoYoshi() {
          if (!canvas) return;
          let type = parseInt(getEl('ms-type').value, 10); // 100, 200, 300, 400
          let text = getEl('ms-text').value || '';
          let cols = 20;
          let rows = 20; // 400文字 (20x20)
          if (type === 100) {
            cols = 10;
            rows = 10;
          } else if (type === 200) {
            cols = 10;
            rows = 20;
          } else if (type === 300) {
            cols = 15;
            rows = 20;
          }
          let cellSize = 30; // 1マスのサイズ(px)
          let width = cols * cellSize;
          let height = rows * cellSize;
          let groupItems = [];
          // 外枠と背景
          groupItems.push(new fabric.Rect({
            left: 0,
            top: 0,
            width: width,
            height: height,
            fill: '#ffffff',
            stroke: '#dc3545',
            strokeWidth: 3
          }));
          // マスの線を描画 (1文字ずつ独立した薄いグレーの四角形枠)
          for (let r = 0; r < rows; r++) {
            for (let c = 0; c < cols; c++) {
              groupItems.push(new fabric.Rect({
                left: c * cellSize,
                top: r * cellSize,
                width: cellSize,
                height: cellSize,
                fill: 'transparent',
                stroke: '#ffcccc',
                strokeWidth: 1
              }));
            }
          }
          // 10行/10列ごとの太いセンター十字線(十字リーダー)
          let midC = cols / 2;
          let midR = rows / 2;
          groupItems.push(new fabric.Line([midC * cellSize, 0, midC * cellSize, height], {
            stroke: '#ff9999',
            strokeWidth: 1.5,
            strokeDashArray: [4, 4]
          }));
          groupItems.push(new fabric.Line([0, midR * cellSize, width, midR * cellSize], {
            stroke: '#ff9999',
            strokeWidth: 1.5,
            strokeDashArray: [4, 4]
          }));
          // Word風の自動文字流し込み処理
          let charArray = text.split('');
          let curCol = 0;
          let curRow = 0;
          charArray.forEach(ch => {
            if (ch === '\n') {
              curRow++;
              curCol = 0;
              return;
            }
            if (curCol >= cols) {
              curCol = 0;
              curRow++;
            }
            if (curRow >= rows) return; // 容量オーバー時は切り捨て
            // 句読点や開きカッコなどの原稿用紙ルール簡易補正(右上に寄せるなど)
            let tx = (curCol * cellSize) + (cellSize / 2);
            let ty = (curRow * cellSize) + (cellSize / 2);
            let tOpts = {
              fontSize: 20,
              fill: '#000000',
              originX: 'center',
              originY: 'center',
              fontFamily: 'sans-serif'
            };
            // 句読点「、」「。」や促音「っ」などはマス目の右上寄りに配置する配慮
            if (['、', '。', '・', 'ー', '「', '」', '(', ')'].includes(ch)) {
              if (['、', '。'].includes(ch)) {
                tx -= 5;
                ty -= 5;
              }
            }
            groupItems.push(new fabric.Text(ch, {
              left: tx,
              top: ty,
              ...tOpts
            }));
            curCol++;
          });
          let offset = getScrollOffset();
          let msGroup = new fabric.Group(groupItems, {
            left: offset.x,
            top: offset.y,
            objectId: generateId()
          });
          canvas.add(msGroup);
          canvas.setActiveObject(msGroup);
          canvas.renderAll();
          closeMSBuilder();
        }
        // --- 補助関数・システム共通 ---
        function toggleSOS() {
          sosState = (sosState + 1) % 3;
          const btn = getEl('sos-button'),
            icon = getEl('sos-icon'),
            txt = getEl('sos-text'),
            wrapper = getEl('canvas-wrapper');
          if (sosState === 0) {
            btn.className = '';
            icon.textContent = '🟢';
            txt.textContent = '順調';
            wrapper.style.borderColor = '#ccc';
          } else if (sosState === 1) {
            btn.className = 'sos-thinking';
            icon.textContent = '🟡';
            txt.textContent = '考え中';
            wrapper.style.borderColor = '#ffca28';
          } else {
            btn.className = 'sos-help';
            icon.textContent = '🔴';
            txt.textContent = '助けて';
            wrapper.style.borderColor = '#dc3545';
          }
        }
    
        function changeBackground() {
          if (!canvas) return;
          const bgType = getEl('bgSelect').value;
          const cb = () => canvas.renderAll();
          if (bgType === 'white') {
            canvas.setBackgroundColor('#ffffff', cb);
          } else if (bgType === 'grid') {
            canvas.setBackgroundColor({
              source: bgGrid,
              repeat: 'repeat'
            }, cb);
          } else if (bgType === 'ruled') {
            canvas.setBackgroundColor({
              source: bgRuled,
              repeat: 'repeat'
            }, cb);
          } else if (bgType === 'blackboard') {
            canvas.setBackgroundColor('#2c5e3b', cb);
            if (currentColor === '#000000') setColor('#ffffff', document.querySelector('.color-btn[title="白(黒板用)"]'));
          }
        }
    
        function getScrollOffset() {
          const wrapper = getEl('canvas-wrapper');
          if (!wrapper) return {
            x: 100,
            y: 100
          };
          return {
            x: wrapper.scrollLeft + 100,
            y: wrapper.scrollTop + 100
          };
        }
    
        function createBoardFrame(type) {
          if (!canvas) return;
          const isVertical = (getEl('textDirection').value === 'v');
          let color = '#dc3545';
          if (type === '学') color = '#1e88e5';
          else if (type === '問') color = '#333333';
          else if (type === '適') color = '#28a745';
          else if (type === '考') color = '#9c27b0';
          else if (type === 'ふ') color = '#fd7e14';
          const offset = getScrollOffset(),
            rw = isVertical ? 120 : 450,
            rh = isVertical ? 450 : 120,
            bx = isVertical ? rw - 20 : -20,
            by = -20;
          const badge = new fabric.Group([new fabric.Circle({
            radius: 20,
            fill: 'white',
            stroke: color,
            strokeWidth: 4,
            originX: 'center',
            originY: 'center'
          }), new fabric.Text(type, {
            fontSize: 24,
            fill: color,
            fontWeight: 'bold',
            originX: 'center',
            originY: 'center'
          })], {
            left: bx,
            top: by
          });
          const frameGroup = new fabric.Group([new fabric.Rect({
            left: 0,
            top: 0,
            width: rw,
            height: rh,
            fill: 'transparent',
            stroke: color,
            strokeWidth: 4,
            rx: 8,
            ry: 8
          }), badge], {
            left: offset.x,
            top: offset.y,
            objectId: generateId()
          });
          const tx = offset.x + (isVertical ? 45 : 40),
            ty = offset.y + (isVertical ? 40 : 30);
          let ph = type === '問' ? '問題を入力...' : type === '学' ? '学習課題を入力...' : type === 'ま' ? 'まとめを入力...' : type === 'め' ? 'めあてを入力...' : type === 'ポ' ? 'ポイントを入力...' : type === '適' ? '適用問題を入力...' : type === '考' ? '自分の考えを入力...' : type === 'ふ' ? 'ふりかえりを入力...' : 'テキストを入力...';
          if (isVertical) ph = ph.replace('を', 'を\n');
          const fontSize = parseInt(getEl('fontSizeSelect').value, 10);
          let innerText = isVertical ? new fabric.Textbox(ph, {
            left: tx,
            top: ty,
            fontSize: fontSize,
            fill: '#333',
            width: fontSize + 10,
            splitByGrapheme: true,
            isVerticalText: true,
            objectId: generateId()
          }) : new fabric.IText(ph.replace('\n', ''), {
            left: tx,
            top: ty,
            fontSize: fontSize,
            fill: '#333',
            objectId: generateId()
          });
          const linkedId = Date.now().toString(),
            relX = tx - offset.x,
            relY = ty - offset.y;
          frameGroup.set({
            linkedId: linkedId,
            linkRole: 'frame',
            relX: relX,
            relY: relY,
            minW: rw,
            minH: rh
          });
          innerText.set({
            linkedId: linkedId,
            linkRole: 'text',
            relX: relX,
            relY: relY
          });
          setupLink(frameGroup, innerText);
          canvas.add(frameGroup, innerText);
          getEl('tool').value = 'select';
          canvas.isDrawingMode = false;
        }
    
        function setupLink(frame, text) {
          frame.off('moving');
          text.off('moving');
          frame.on('moving', () => {
            text.set({
              left: frame.left + frame.relX,
              top: frame.top + frame.relY
            });
            text.setCoords();
          });
          text.on('moving', () => {
            frame.set({
              left: text.left - frame.relX,
              top: text.top - frame.relY
            });
            frame.setCoords();
          });
          text.on('changed', () => {
            const rect = frame.getObjects()[0],
              minW = frame.minW || 0,
              minH = frame.minH || 0;
            const newW = Math.max(minW, text.width + 60),
              newH = Math.max(minH, text.height + 60);
            if (rect.width !== newW || rect.height !== newH) {
              rect.set({
                width: newW,
                height: newH
              });
              const oldLeft = frame.left,
                oldTop = frame.top;
              frame.addWithUpdate();
              frame.set({
                left: oldLeft,
                top: oldTop
              });
              frame.setCoords();
              canvas.renderAll();
            }
          });
        }
    
        function addSticky() {
          const offset = getScrollOffset(),
            isVertical = (getEl('textDirection').value === 'v'),
            fontSize = parseInt(getEl('fontSizeSelect').value, 10);
          const opts = {
            left: offset.x + 50,
            top: offset.y + 50,
            fontSize: fontSize,
            padding: 15,
            backgroundColor: '#fff9c4',
            fill: currentColor,
            shadow: new fabric.Shadow({
              color: 'rgba(0,0,0,0.3)',
              blur: 5,
              offsetX: 3,
              offsetY: 3
            }),
            objectId: generateId()
          };
          let stickyText = isVertical ? new fabric.Textbox('ここに入力', {
            ...opts,
            width: fontSize + 10,
            splitByGrapheme: true,
            isVerticalText: true
          }) : new fabric.IText('ここに入力', opts);
          canvas.add(stickyText);
          canvas.setActiveObject(stickyText);
          stickyText.enterEditing();
          stickyText.selectAll();
        }
    
        function addBiLingualSticky() {
          const offset = getScrollOffset(),
            fontSize = parseInt(getEl('fontSizeSelect').value, 10);
          canvas.add(new fabric.Textbox("🇯🇵 日本語:\nここに入力\n\n🇲🇳 モンゴル語:\nここに入力", {
            left: offset.x + 50,
            top: offset.y + 50,
            fontSize: fontSize,
            padding: 15,
            backgroundColor: '#e3f2fd',
            fill: currentColor,
            width: 350,
            shadow: new fabric.Shadow({
              color: 'rgba(0,0,0,0.3)',
              blur: 5,
              offsetX: 3,
              offsetY: 3
            }),
            objectId: generateId()
          }));
        }
    
        function changeTool() {
          if (!canvas) return;
          const tool = getEl('tool').value;
          canvas.isDrawingMode = (tool === 'draw' || tool === 'highlight');
          if (tool === 'highlight') {
            canvas.freeDrawingBrush.width = parseInt(getEl('fontSizeSelect').value, 10) * 1.2 || 20;
            let hex = currentColor.replace('#', ''),
              r = parseInt(hex.substring(0, 2), 16),
              g = parseInt(hex.substring(2, 4), 16),
              b = parseInt(hex.substring(4, 6), 16);
            canvas.freeDrawingBrush.color = `rgba(${r}, ${g}, ${b}, 0.3)`;
          } else if (tool === 'draw') {
            canvas.freeDrawingBrush.width = 4;
            canvas.freeDrawingBrush.color = currentColor;
          }
        }
    
        function setColor(color, btnElement) {
          currentColor = color;
          document.querySelectorAll('.color-btn').forEach(btn => btn.classList.remove('active'));
          if (btnElement) btnElement.classList.add('active');
          if (canvas) {
            const activeObj = canvas.getActiveObject();
            if (activeObj && (activeObj.type === 'i-text' || activeObj.type === 'textbox')) {
              activeObj.set('fill', color);
              canvas.renderAll();
            } else if (activeObj && ['line', 'rect', 'circle', 'polygon'].includes(activeObj.type)) {
              activeObj.set('stroke', color);
              canvas.renderAll();
            }
            changeTool();
          }
        }
    
        function changeFontSize() {
          if (!canvas) return;
          const size = parseInt(getEl('fontSizeSelect').value, 10);
          canvas.getActiveObjects().forEach(obj => {
            if (obj.type === 'i-text' || obj.type === 'textbox') {
              obj.set('fontSize', size);
              if (obj.isVerticalText) obj.set('width', size + 10);
            }
          });
          canvas.renderAll();
        }
    
        function deleteSelected() {
          const activeObjects = canvas.getActiveObjects();
          if (activeObjects.length === 0) return;
          let removedItems = [];
          const idsToDelete = activeObjects.map(o => o.linkedId).filter(id => id);
          canvas.getObjects().forEach(obj => {
            if (activeObjects.includes(obj) || idsToDelete.includes(obj.linkedId)) {
              removedItems.push(obj);
              canvas.remove(obj);
            }
          });
          if (removedItems.length > 0) {
            trashBin.push(removedItems);
            if (trashBin.length > 10) trashBin.shift();
            canvas.discardActiveObject();
          }
        }
    
        function restoreDeleted() {
          if (trashBin.length > 0) trashBin.pop().forEach(obj => canvas.add(obj));
        }
    
        function clearAll() {
          if (confirm(`ほんとうに ページ ${currentPage} を ぜんぶ けしますか?`)) {
            canvas.clear();
            changeBackground(true);
            trashBin = [];
          }
        }
    
        function bringToFront() {
          canvas.getActiveObjects().forEach(obj => canvas.bringToFront(obj));
          canvas.discardActiveObject();
          canvas.renderAll();
        }
    
        function sendToBack() {
          canvas.getActiveObjects().forEach(obj => canvas.sendToBack(obj));
          canvas.discardActiveObject();
          canvas.renderAll();
        }
    
        function toggleLock() {
          canvas.getActiveObjects().forEach(obj => {
            const isLocked = obj.lockMovementX;
            obj.set({
              lockMovementX: !isLocked,
              lockMovementY: !isLocked,
              lockRotation: !isLocked,
              lockScalingX: !isLocked,
              lockScalingY: !isLocked,
              hasControls: isLocked,
              hoverCursor: !isLocked ? 'default' : 'move'
            });
          });
          canvas.discardActiveObject();
          canvas.renderAll();
        }
    
        function renderPageButtons() {
          const container = getEl('page-list');
          container.innerHTML = '';
          for (let i = 1; i <= maxPage; i++) {
            const btn = document.createElement('button');
            btn.className = `page-btn ${i === currentPage ? 'active' : ''}`;
            btn.textContent = i;
            btn.onclick = () => switchPage(i);
            container.appendChild(btn);
          }
        }
    
        function switchPage(pageNumber) {
          if (currentPage === pageNumber) return;
          saveCurrentPageLocally();
          currentPage = pageNumber;
          renderPageButtons();
          trashBin = [];
          loadPageLocally(pageNumber);
        }
    
        function addPage() {
          saveCurrentPageLocally();
          maxPage++;
          currentPage = maxPage;
          renderPageButtons();
          canvas.clear();
          getEl('bgSelect').value = 'white';
          changeBackground(true);
        }
    
        function saveCurrentPageLocally() {
          if (canvas) localPagesData[currentPage] = {
            bg: getEl('bgSelect').value,
            objects: canvas.getObjects().map(o => o.toObject(customProps))
          };
        }
    
        function loadPageLocally(pageNumber) {
          canvas.clear();
          const data = localPagesData[pageNumber];
          if (!data || !data.objects || data.objects.length === 0) {
            getEl('bgSelect').value = 'white';
            changeBackground(true);
            return;
          }
          getEl('bgSelect').value = data.bg || 'white';
          changeBackground(true);
          canvas.loadFromJSON({
            objects: data.objects
          }, () => {
            const linkedMap = {};
            canvas.getObjects().forEach(obj => {
              if (obj.linkedId) {
                if (!linkedMap[obj.linkedId]) linkedMap[obj.linkedId] = {};
                linkedMap[obj.linkedId][obj.linkRole] = obj;
              }
            });
            Object.values(linkedMap).forEach(pair => {
              if (pair.frame && pair.text) setupLink(pair.frame, pair.text);
            });
            canvas.renderAll();
          });
        }
    
        function saveAsDataLocally() {
          const title = prompt("保存する題名を入力してください\n(例:3年算数 角の大きさ 1時目)");
          if (!title) return;
          saveCurrentPageLocally();
          const dataToSave = {
            title: title,
            date: new Date().toLocaleString(),
            maxPage: maxPage,
            currentPage: currentPage,
            pages: localPagesData
          };
          try {
            let saves = JSON.parse(localStorage.getItem(SAVES_KEY) || '{}');
            saves['save_' + Date.now()] = dataToSave;
            localStorage.setItem(SAVES_KEY, JSON.stringify(saves));
            alert(`「${title}」として保存しました!`);
          } catch (e) {
            alert('保存に失敗しました。');
          }
        }
    
        function openLoadModal() {
          const saves = JSON.parse(localStorage.getItem(SAVES_KEY) || '{}'),
            list = getEl('save-list');
          list.innerHTML = '';
          if (Object.keys(saves).length === 0) list.innerHTML = '<p style="text-align:center;">履歴はありません。</p>';
          else {
            Object.keys(saves).sort((a, b) => b.localeCompare(a)).forEach(id => {
              list.innerHTML += `<div class="save-item"><div class="save-item-info"><span class="save-item-title">${saves[id].title}</span><span class="save-item-date">${saves[id].date}</span></div><div class="save-item-actions"><button onclick="loadSaveData('${id}')" class="btn-base btn-blue">開く</button><button onclick="deleteSaveData('${id}')" class="btn-base btn-red">削除</button></div></div>`;
            });
          }
          getEl('save-load-modal').style.display = 'block';
        }
    
        function loadSaveData(id) {
          if (!confirm("現在編集中の内容は失われます。よろしいですか?")) return;
          const savedData = JSON.parse(localStorage.getItem(SAVES_KEY) || '{}')[id];
          if (savedData) {
            maxPage = savedData.maxPage || 1;
            currentPage = savedData.currentPage || 1;
            localPagesData = savedData.pages || {};
            renderPageButtons();
            loadPageLocally(currentPage);
            getEl('save-load-modal').style.display = 'none';
          }
        }
    
        function deleteSaveData(id) {
          if (!confirm("本当にこの履歴を削除しますか?")) return;
          let saves = JSON.parse(localStorage.getItem(SAVES_KEY) || '{}');
          delete saves[id];
          localStorage.setItem(SAVES_KEY, JSON.stringify(saves));
          openLoadModal();
        }
    
        function exportPNG() {
          if (!canvas.backgroundColor) {
            canvas.backgroundColor = '#ffffff';
            canvas.renderAll();
          }
          const link = document.createElement('a');
          link.download = `ボード記録_P${currentPage}.png`;
          link.href = canvas.toDataURL({
            format: 'png',
            quality: 1
          });
          link.click();
        }
    
        function openGallery() {
          saveCurrentPageLocally();
          const grid = getEl('gallery-grid');
          grid.innerHTML = '';
          const offscreen = new fabric.StaticCanvas(document.createElement('canvas'), {
            width: 2000,
            height: 1500,
            backgroundColor: '#ffffff'
          });
          const renderGallery = async () => {
            for (let pNum = 1; pNum <= maxPage; pNum++) {
              const data = localPagesData[pNum];
              if (!data || !data.objects || data.objects.length === 0) {
                grid.innerHTML += `<div class="gallery-item" onclick="switchPage(${pNum}); getEl('gallery-modal').style.display='none'"><h3>📄 ページ ${pNum}</h3><p>(白紙です)</p></div>`;
                continue;
              }
              await new Promise(resolve => {
                offscreen.clear();
                let bgConfig = data.bg === 'grid' ? {
                  source: bgGrid,
                  repeat: 'repeat'
                } : data.bg === 'ruled' ? {
                  source: bgRuled,
                  repeat: 'repeat'
                } : data.bg === 'blackboard' ? '#2c5e3b' : '#ffffff';
                offscreen.setBackgroundColor(bgConfig, () => {
                  offscreen.loadFromJSON({
                    objects: data.objects
                  }, () => {
                    offscreen.renderAll();
                    grid.innerHTML += `<div class="gallery-item" onclick="switchPage(${pNum}); getEl('gallery-modal').style.display='none'"><h3>📄 ページ ${pNum}</h3><img src="${offscreen.toDataURL({ format: 'png' })}"></div>`;
                    resolve();
                  });
                });
              });
            }
          };
          renderGallery().then(() => {
            getEl('gallery-modal').style.display = 'block';
          });
        }
    
        function startTimer() {
          clearInterval(timerInterval);
          let btn = getEl('startTimerBtn');
          if (btn.textContent === '■') {
            btn.textContent = '▶';
            return;
          }
          let time = (parseInt(getEl('timerMin').value) || 3) * 60;
          btn.textContent = '■';
          getEl('timerDisplay').textContent = `${(time/60).toString().padStart(2, '0')}:00`;
          timerInterval = setInterval(() => {
            time--;
            getEl('timerDisplay').textContent = `${Math.floor(time / 60).toString().padStart(2, '0')}:${(time % 60).toString().padStart(2, '0')}`;
            if (time <= 0) {
              clearInterval(timerInterval);
              btn.textContent = '▶';
              alert('時間になりました!');
            }
          }, 1000);
        }
    
        function handleImageUpload(e) {
          const file = e.target.files[0];
          if (!file) return;
          const reader = new FileReader();
          reader.onload = (event) => {
            fabric.Image.fromURL(event.target.result, (image) => {
              const offset = getScrollOffset();
              image.set({
                left: offset.x,
                top: offset.y,
                objectId: generateId()
              });
              if (image.width > 600) image.scaleToWidth(600);
              canvas.add(image);
              canvas.setActiveObject(image);
              getEl('tool').value = 'select';
              canvas.isDrawingMode = false;
            });
          };
          reader.readAsDataURL(file);
          e.target.value = '';
        }
      </script>
    </body>
    
    </html>

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