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<!doctype html>
<html lang="zh-Hant">
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width,initial-scale=1"/>
<title>Guitar_Tool</title>
<script src="https://cdn.jsdelivr.net/npm/vexflow@4.2.2/build/cjs/vexflow.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js"></script>
<style>
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;600;700&display=swap');
/* ── Notion-style palette ── */
:root{
/* Light mode is default (Notion is always light) */
--bg:#ffffff;
--panel:#f7f7f5;
--surface:#f1f1ef;
--border:#e9e9e7;
--border-strong:#d3d3cf;
--text:#37352f;
--muted:#9b9b97;
--accent:#37352f;
--link:#2383e2;
--tab-bg:#ffffff;
--note:#37352f; --note-neutral:#9b9b97; --note-dim:#e2e2df;
--fret:#d3d3cf; --fret-alt:#f7f7f5;
--btn-bg:#ffffff; --btn-text:#37352f; --btn-border:#e9e9e7; --card:#ffffff;
--mono:'JetBrains Mono',monospace;
/* action colors — muted, Notion-like */
--red:#eb5757; --green:#0f7b6c; --blue:#0b6bcb;
--red-t:rgba(235,87,87,.08); --green-t:rgba(15,123,108,.08); --blue-t:rgba(11,107,203,.08);
}
.dark-theme{
--bg:#191919;
--panel:#2f2f2f;
--surface:#373737;
--border:#454545;
--border-strong:#5a5a5a;
--text:#e6e6e5;
--muted:#999995;
--ash:#aaaaaa;
--tab-bg:#1f1f1f;
--fret:#454545; --fret-alt:#2a2a2a;
--btn-bg:#373737; --btn-text:#e6e6e5; --btn-border:#4a4a4a; --card:#2f2f2f;
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:'Inter',system-ui,-apple-system,sans-serif;font-size:15px;line-height:1.4;height:100dvh;display:flex;flex-direction:column;overflow:hidden;transition:background .3s,color .3s}
/* ── HEADER ── */
header{background:var(--bg);border-bottom:1px solid var(--border);display:flex;align-items:stretch;flex-shrink:0}
.brand{padding:10px 20px;display:flex;align-items:center;gap:10px;border-right:1px solid var(--border)}
.brand-title{font-size:.92rem;font-weight:700;color:var(--text);line-height:1.2;letter-spacing:-.3px}
.brand-sub{font-size:.62rem;color:var(--muted)}
.page-tabs{display:flex;align-items:flex-end;padding:0 10px;gap:2px}
.page-tab{padding:8px 14px;background:transparent;border:none;border-bottom:2px solid transparent;color:var(--muted);font-size:.8rem;font-family:inherit;cursor:pointer;transition:all .12s;white-space:nowrap;border-radius:4px 4px 0 0}
.page-tab.active{color:var(--text);border-bottom-color:var(--text);font-weight:600}
.page-tab:hover:not(.active){color:var(--text);background:var(--surface)}
.header-right{margin-left:auto;display:flex;align-items:center;padding:0 14px;gap:8px}
/* ── SHARED CONTROLS ── */
select,button,input[type=number],input[type=text]{background:var(--btn-bg);color:var(--btn-text);border:1px solid var(--btn-border);border-radius:4px;padding:5px 9px;font-size:.8rem;font-family:inherit;cursor:pointer;transition:all .12s;outline:none}
select:focus,input:focus{border-color:var(--border-strong);box-shadow:0 0 0 2px rgba(55,53,47,.06)}
button:disabled{opacity:.4;cursor:not-allowed}
input[type=number]{width:62px}
label{font-size:.7rem;color:var(--muted);margin-right:4px}
.btn-accent{background:var(--text);color:#fff;border-color:var(--text);font-weight:600}
.btn-accent:hover:not(:disabled){background:#555250}
.dark-theme .btn-accent{background:#4a4a48;color:#e6e6e5;border-color:#555552}
.dark-theme .btn-accent:hover:not(:disabled){background:#565654}
.btn-ghost{background:transparent;border-color:transparent;color:var(--muted)}
.btn-ghost:hover{background:var(--surface);color:var(--text)}
.sep{width:1px;background:var(--border);align-self:stretch;margin:6px 4px}
/* ── PAGES ── */
.page{display:none;flex-direction:column;flex:1;overflow:hidden}
.page.active{display:flex}
/* ══════════════════════════════════════════
PAGE 1: FRETBOARD
══════════════════════════════════════════ */
.fb-toolbar{background:var(--panel);border-bottom:1px solid var(--border);padding:8px 16px;display:flex;gap:10px;align-items:center;flex-wrap:wrap;flex-shrink:0}
.fb-body{flex:1;overflow:auto;padding:14px}
.board-wrap{overflow:auto;border:1px solid var(--border);border-radius:6px;background:var(--bg);}
svg#board{display:block;width:1600px;max-width:none}
.string{stroke:#c7c7c3;stroke-width:1.4}
.fret{stroke:var(--fret);stroke-width:2}
.fret.first-fret{stroke-width:7;stroke:#9b9b97}
.fret-bg{fill:var(--fret-alt)}
.dark-theme .string{stroke:#484846;stroke-width:1.2}
.dark-theme .fret{stroke:#383836}
.dark-theme .fret.first-fret{stroke:#666;stroke-width:5}
.dark-theme .marker-dot{fill:#383836;opacity:1}
.dark-theme .fret-bg{fill:#222220}
.dark-theme .board-wrap{background:#191919;}
.note{cursor:pointer}
.note circle{fill:#ffffff;stroke:#e0e0de;stroke-width:1.2}
.note text{font-weight:500;font-size:11px;fill:#c8c8c4}
.note.in-scale circle{stroke:#37352f;stroke-width:1.5}
.note.in-scale text{fill:#37352f;font-weight:600}
.note.marked circle{fill:#37352f !important;stroke:#37352f !important}
.note.marked text{fill:#ffffff !important}
/* dark theme note adjustments — fill set by JS, CSS handles stroke/text */
/* dark: circles match bg (invisible bg), in-scale show subtle outline + text */
.dark-theme .note circle{fill:#252523 !important;stroke:#3a3a38;stroke-width:1}
.dark-theme .note text{fill:#3a3a38}
.dark-theme .note.in-scale circle{fill:#252523 !important;stroke:#808078;stroke-width:1.2}
.dark-theme .note.in-scale text{fill:#b8b8b4;font-weight:500}
.dark-theme .note.marked circle{fill:#e0e0de !important;stroke:#e0e0de !important}
.dark-theme .note.marked text{fill:#191919 !important}
.marker-dot{fill:#c7c7c3;opacity:.6}
.chord-panel{margin:12px 14px 0;padding:12px 16px;border:1px solid var(--border);border-radius:4px;background:var(--panel);font-size:.9rem;line-height:1.8;min-height:60px;text-align:center;color:var(--text)}
.snap-hint{font-size:.7rem;color:var(--muted);padding:8px 14px 2px;display:block}
.snapshots{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;margin:4px 14px 14px;overflow-y:auto}
.snap-card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:8px 10px 10px;transition:border-color .15s;cursor:pointer}
.snap-card:hover{border-color:var(--border-strong);background:var(--panel)}
.snap-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.snap-title{font-size:.8rem;font-weight:700;color:var(--text)}
.snap-del{border:none !important;background:transparent !important;color:var(--muted);font-size:.7rem;padding:2px 6px !important}
.snap-del:hover{color:#f87171 !important}
.snap-svg{display:block;width:100%;height:auto}
.snap-notes{font-size:.65rem;color:var(--muted);margin-top:4px;font-family:'Courier Prime',monospace}
/* ══════════════════════════════════════════
PAGE 2: PROFESSIONAL TAB EDITOR
══════════════════════════════════════════ */
/* TAB page overrides: row layout (panel left + preview right) */
#page-tab-editor{ flex-direction:row !important; }
/* Left control panel */
.tab-panel{
width:260px;min-width:260px;
background:var(--panel);
border-right:1px solid var(--border);
overflow-y:auto;
display:flex;flex-direction:column;
height:100%;flex-shrink:0;
}
.tab-panel::-webkit-scrollbar{width:4px}
.tab-panel::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:2px}
.sec{padding:12px 14px;border-bottom:1px solid var(--border)}
.sec-title{
font-size:.68rem;font-weight:600;letter-spacing:.5px;
color:var(--muted);margin-bottom:10px;
display:flex;align-items:center;gap:6px;
}
/* fields */
.field{margin-bottom:8px}
.field label{display:block;font-size:.6rem;color:var(--muted);margin-bottom:3px;letter-spacing:.5px;margin-right:0}
.field input,.field select{width:100%;background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:6px 9px;font-family:var(--mono);font-size:.78rem;outline:none;transition:border-color .15s;cursor:auto}
.field input:focus,.field select:focus{border-color:var(--ash)}
.field-row{display:flex;gap:8px}
.field-row .field{flex:1}
/* cursor display */
.cursor-disp{background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:8px;display:grid;grid-template-columns:1fr 1fr 1fr;gap:2px;margin-bottom:10px}
.cval{display:flex;flex-direction:column;align-items:center;gap:2px}
.cval .cl{font-size:.52rem;color:var(--muted);letter-spacing:1px;text-transform:uppercase}
.cval .cv{font-size:1rem;font-weight:700;color:var(--text);line-height:1}
/* fret input */
.fret-row{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.fret-row label{font-size:.62rem;color:var(--muted);white-space:nowrap;flex-shrink:0;margin-right:0}
#fretInput{
width:60px;background:var(--surface);
border:1px solid var(--border-strong);
border-radius:4px;color:var(--text);
font-family:var(--mono);font-size:1.2rem;font-weight:700;
text-align:center;padding:4px 6px;outline:none;transition:all .12s;cursor:text;
}
#fretInput:focus{border-color:var(--text);box-shadow:0 0 0 2px rgba(55,53,47,.1)}
.fret-hint{font-size:.58rem;color:var(--muted)}
/* duration buttons */
.dur-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:4px;margin-bottom:10px}
.dur-btn{
background:var(--surface);border:1px solid var(--border);color:var(--muted);
border-radius:6px;padding:6px 2px 4px;cursor:pointer;transition:all .15s;
text-align:center;display:flex;flex-direction:column;align-items:center;gap:2px;
font-family:inherit;
}
.dur-btn .ds{font-size:1rem;line-height:1}
.dur-btn .dl{font-size:.48rem;color:var(--muted)}
.dur-btn.active{background:var(--text);border-color:var(--text);color:#fff}
.dur-btn.active .dl{color:rgba(255,255,255,.7)}
.dark-theme .dur-btn.active{background:#4a4a48;border-color:#555552;color:#e6e6e5}
.dark-theme .dur-btn.active .dl{color:rgba(230,230,229,.6)}
.dur-btn:not(.active):hover{background:var(--surface);border-color:var(--border-strong)}
/* action buttons */
.tbtn{
padding:6px 8px;border-radius:6px;border:1px solid var(--border);
background:var(--surface);color:var(--text);
font-family:var(--mono);font-size:.72rem;cursor:pointer;transition:all .15s;
text-align:center;white-space:nowrap;
}
.tbtn:hover{border-color:var(--ash);color:var(--ash)}
.tbtn.g{border-color:var(--border);color:var(--green);background:var(--green-t)}
.tbtn.g:hover{background:var(--green);color:#fff}
.tbtn.r{border-color:var(--border);color:var(--red);background:var(--red-t)}
.tbtn.r:hover{background:var(--red);color:#fff}
.tbtn.b{border-color:var(--border);color:var(--blue);background:var(--blue-t)}
.tbtn.b:hover{background:var(--blue);color:#fff}
.tbtn.full{width:100%;display:block;margin-bottom:6px}
.tbtn-row{display:flex;gap:6px;margin-bottom:6px}
.tbtn-row .tbtn{flex:1}
/* technique grid */
.tech-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:4px}
.tech-btn{
background:var(--surface);border:1px solid var(--border);color:var(--muted);
border-radius:6px;padding:5px 4px 4px;
font-family:var(--mono);font-size:.8rem;cursor:pointer;transition:all .15s;
text-align:center;line-height:1.2;
}
.tech-btn span{display:block;font-size:.45rem;color:var(--muted)}
.tech-btn:hover{background:var(--surface);border-color:var(--border-strong)}
.tech-btn.active{background:var(--text);border-color:var(--text);color:#fff}
/* measure info */
.m-info{text-align:center;font-size:.65rem;color:var(--muted);background:var(--surface);border-radius:6px;padding:6px;margin-bottom:8px}
.m-info strong{color:var(--text);font-size:.9rem}
/* Right preview */
.tab-preview{
flex:1;min-width:0;overflow-y:auto;padding:18px 20px;
background:var(--bg);
display:flex;flex-direction:column;gap:12px;
height:100%;
}
.tab-preview::-webkit-scrollbar{width:6px}
.tab-preview::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
.score-header{text-align:center}
.score-title{font-size:1.4rem;font-weight:700;color:var(--text);margin-bottom:2px;letter-spacing:-.5px}
.score-sub{font-size:.72rem;color:var(--muted);letter-spacing:1px}
.score-wrap{
background:#ffffff;border-radius:4px;
border:1px solid var(--border);
padding:20px 12px 12px;
overflow-x:auto;position:relative;
}
/* TAB score is always white regardless of theme */
.dark-theme .score-wrap{background:#ffffff;border-color:#e0e0e0;}
/* VexFlow stems: thinner */
#scoreContainer svg line[stroke-width="2"],
#scoreContainer svg line[stroke-width="3"]{ stroke-width:1 !important; stroke:#555 !important; }
#scoreContainer svg rect[fill="black"],
#scoreContainer svg rect[fill="#000000"]{ fill:#555 !important; }
/* Cursor overlay */
#cursorOverlay{
position:absolute;pointer-events:none;
top:0;left:0;width:100%;height:100%;overflow:hidden;
}
/* Cursor overlay — always dark since score-wrap is always white */
.cur-col{
position:absolute;width:26px;border-radius:3px;
background:rgba(55,53,47,.08);
border:1.5px solid rgba(55,53,47,.4);
animation:curPulse 1s ease-in-out infinite;
}
.cur-dot{
position:absolute;width:12px;height:12px;border-radius:50%;
background:#37352f;border:2px solid #fff;
box-shadow:0 1px 4px rgba(0,0,0,.2);
transform:translate(-50%,-50%);
animation:curPulse 1s ease-in-out infinite;
}
.cur-label{
position:absolute;background:#37352f;color:#fff;
font-family:var(--mono);font-size:9px;font-weight:600;
padding:2px 6px;border-radius:3px;white-space:nowrap;
transform:translateX(-50%);letter-spacing:.3px;
}
@keyframes curPulse{0%,100%{opacity:1}50%{opacity:.6}}
/* Status bar */
.statusbar{
background:var(--panel);border-top:1px solid var(--border);
padding:5px 20px;font-size:.62rem;color:var(--muted);
display:flex;gap:14px;align-items:center;flex-shrink:0;
font-family:var(--mono);
}
.kb{color:var(--text);font-weight:600;margin-right:2px;background:var(--surface);padding:1px 4px;border-radius:3px;border:1px solid var(--border)}
.status-msg{margin-left:auto}
.st-ok{color:var(--muted)}.st-err{color:var(--red)}.st-warn{color:#c77d0a}
</style>
</head>
<body>
<!-- ══ HEADER ══ -->
<header>
<div class="brand">
<div>
<div class="brand-title">Guitar Tool</div>
<div class="brand-sub">Fretboard · TAB Editor</div>
</div>
</div>
<nav class="page-tabs">
<button class="page-tab active" data-target="page-fretboard">指板工具</button>
<button class="page-tab" data-target="page-tab-editor">TAB 編輯器</button>
</nav>
<div class="header-right">
<button id="themeToggle" class="btn-ghost" title="明亮/暗色" style="font-size:.72rem;padding:5px 10px">明暗</button>
</div>
</header>
<!-- ══ PAGE 1: FRETBOARD ══ -->
<div class="page active" id="page-fretboard">
<div class="fb-toolbar">
<div><label>Key</label>
<select id="keySel">
<option>C</option><option>G</option><option>D</option><option>A</option><option>E</option>
<option>B</option><option>F#</option><option>Db</option><option>Ab</option><option>Eb</option>
<option>Bb</option><option>F</option>
</select>
</div>
<div><label>Scale</label>
<select id="scaleSel">
<option value="major" selected>Major</option>
<option value="natural_minor">Natural Minor</option>
<option value="penta_major">Pentatonic Major</option>
<option value="penta_minor">Pentatonic Minor</option>
<option value="none">（不顯示）</option>
</select>
</div>
<div><label>顯示</label>
<select id="labelSel">
<option value="note" selected>音名</option>
<option value="degree">級數</option>
</select>
</div>
<div class="sep"></div>
<button id="strumUpBtn" class="btn-accent" disabled>播放和弦</button>
<button id="saveSnapBtn" disabled>儲存快照</button>
</div>
<div class="fb-body">
<div class="board-wrap">
<svg id="board" viewBox="0 0 1600 320" aria-label="guitar fretboard"></svg>
</div>
<div class="chord-panel" id="chordPanel">目前未選音。點選各弦上的圓點來標記，這裡會顯示和絃。</div>
<span class="snap-hint">把目前標記的發聲位置存成和絃圖</span>
<div class="snapshots" id="snapshots"></div>
</div>
</div>
<!-- ══ PAGE 2: TAB EDITOR ══ -->
<div class="page" id="page-tab-editor">
<!-- Left panel -->
<div class="tab-panel">
<div class="sec">
<div class="sec-title">曲目資訊</div>
<div class="field"><label>歌曲名稱</label><input type="text" id="songTitle" value="Untitled"></div>
<div class="field"><label>演奏者</label><input type="text" id="artistName" placeholder="Artist"></div>
<div class="field-row">
<div class="field"><label>BPM</label><input type="number" id="bpmInput" value="120" min="20" max="400" style="width:100%"></div>
<div class="field"><label>拍號</label>
<select id="timeSigSel" style="width:100%">
<option value="4/4" selected>4/4</option>
<option value="3/4">3/4</option>
<option value="6/8">6/8</option>
</select>
</div>
</div>
</div>
<div class="sec">
<div class="sec-title">音符輸入</div>
<div class="cursor-disp">
<div class="cval"><span class="cl">MEASURE</span><span class="cv" id="curM">1</span></div>
<div class="cval"><span class="cl">BEAT</span><span class="cv" id="curB">1</span></div>
<div class="cval"><span class="cl">STRING</span><span class="cv" id="curS">1</span></div>
</div>
<div class="fret-row">
<label>格數</label>
<input type="text" id="fretInput" placeholder="0" maxlength="2" inputmode="numeric">
<span class="fret-hint">0 – 24</span>
</div>
<div class="sec-title" style="margin-bottom:6px">音符時值</div>
<div class="dur-grid">
<button class="dur-btn" data-dur="w"><span class="ds">𝅝</span><span class="dl">全</span></button>
<button class="dur-btn" data-dur="h"><span class="ds">𝅗𝅥</span><span class="dl">二分</span></button>
<button class="dur-btn active" data-dur="q"><span class="ds">♩</span><span class="dl">四分</span></button>
<button class="dur-btn" data-dur="8"><span class="ds">♪</span><span class="dl">八分</span></button>
<button class="dur-btn" data-dur="16"><span class="ds">𝅘𝅥𝅯</span><span class="dl">十六</span></button>
</div>
<div class="tbtn-row">
<button class="tbtn g" id="btnEnter">輸入</button>
<button class="tbtn" id="btnRest">休止</button>
<button class="tbtn r" id="btnDelete">刪除</button>
</div>
</div>
<div class="sec">
<div class="sec-title">吉他技巧</div>
<div class="tech-grid">
<button class="tech-btn" data-tech="h">h<span>hammer</span></button>
<button class="tech-btn" data-tech="p">p<span>pull</span></button>
<button class="tech-btn" data-tech="slide_up">/<span>slide↑</span></button>
<button class="tech-btn" data-tech="slide_down">\<span>slide↓</span></button>
<button class="tech-btn" data-tech="bend">b<span>bend</span></button>
<button class="tech-btn" data-tech="vibrato">~<span>vibrato</span></button>
<button class="tech-btn" data-tech="mute">x<span>mute</span></button>
<button class="tech-btn r" id="btnClearTech">清除<span>clear</span></button>
</div>
</div>
<div class="sec">
<div class="sec-title">播放</div>
<div class="tbtn-row">
<button class="tbtn g full" id="btnPlay">▶ 播放</button>
<button class="tbtn r" id="btnStop" disabled>■ 停止</button>
</div>
<div class="field" style="margin-top:6px">
<label>從第幾小節</label>
<input type="number" id="playFromM" value="1" min="1" style="width:100%">
</div>
</div>
<div class="sec">
<div class="sec-title">小節管理</div>
<div class="m-info">共 <strong id="measureCount">1</strong> 小節</div>
<div class="tbtn-row">
<button class="tbtn g" id="btnAddM">新增小節</button>
<button class="tbtn r" id="btnDelM">刪除末節</button>
</div>
</div>
<div class="sec">
<div class="sec-title">匯出</div>
<button class="tbtn b full" id="btnPDF">匯出 PDF</button>
<button class="tbtn r full" id="btnClearAll">清除全部</button>
</div>
</div><!-- /tab-panel -->
<!-- Right preview -->
<div class="tab-preview" id="previewArea">
<div class="score-header">
<div class="score-title" id="dispTitle">Untitled</div>
<div class="score-sub" id="dispSub">♩ = 120</div>
</div>
<div class="score-wrap">
<div id="scoreContainer"></div>
<div id="cursorOverlay"></div>
</div>
</div>
</div><!-- /page-tab-editor -->
<!-- Status bar: only shown in TAB editor page -->
<div class="statusbar" id="globalStatusbar">
<span><span class="kb">←→</span>移動</span>
<span><span class="kb">↑↓</span>換弦</span>
<span><span class="kb">0-9</span>格數</span>
<span><span class="kb">Enter</span>確認</span>
<span><span class="kb">Del</span>刪除</span>
<span><span class="kb">Space</span>播放/停止</span>
<span><span class="kb">h p s b ~ x r</span>技巧/休止</span>
<span class="status-msg st-ok" id="statusMsg">Ready</span>
</div>
<script>
/* ════════════════════════════════════════════════════════
PAGE SWITCHING
════════════════════════════════════════════════════════ */
document.querySelectorAll('.page-tab').forEach(btn => {
btn.addEventListener('click', () => {
document.querySelectorAll('.page-tab').forEach(b => b.classList.remove('active'));
document.querySelectorAll('.page').forEach(p => p.classList.remove('active'));
btn.classList.add('active');
document.getElementById(btn.dataset.target).classList.add('active');
if (btn.dataset.target === 'page-tab-editor') {
setTimeout(() => { renderScore(); drawCursorOverlay(); }, 50);
}
updateStatusbarVisibility();
});
});
/* ════════════════════════════════════════════════════════
THEME
════════════════════════════════════════════════════════ */
const themeToggle = document.getElementById('themeToggle');
function updateThemeIcon() {
const isDark = document.body.classList.contains('dark-theme');
themeToggle.textContent = isDark ? '淺色' : '深色';
}
themeToggle.addEventListener('click', () => {
document.body.classList.toggle('dark-theme');
updateThemeIcon();
buildBoard();
if (document.getElementById('page-tab-editor').classList.contains('active')) renderScore();
});
updateThemeIcon();
// Show/hide statusbar based on active page
function updateStatusbarVisibility() {
const sb = document.getElementById('globalStatusbar');
if (sb) sb.style.display = document.getElementById('page-tab-editor').classList.contains('active') ? 'flex' : 'none';
}
updateStatusbarVisibility();
/* ════════════════════════════════════════════════════════
FRETBOARD TOOL (original logic, unchanged)
════════════════════════════════════════════════════════ */
const NOTES_SHARP=["C","C#","D","D#","E","F","F#","G","G#","A","A#","B"];
const NOTES_FLAT =["C","Db","D","Eb","E","F","Gb","G","Ab","A","Bb","B"];
const SCALES={major:[0,2,4,5,7,9,11],natural_minor:[0,2,3,5,7,8,10],penta_major:[0,2,4,7,9],penta_minor:[0,3,5,7,10]};
const STANDARD_TUNING=["E4","B3","G3","D3","A2","E2"];
let audioCtx=null;
function ensureAudio(){if(!audioCtx)audioCtx=new(window.AudioContext||window.webkitAudioContext)();}
const midiToFreq=m=>2**((m-69)/12)*440;
const norm=n=>((n%12)+12)%12;
function preferAccidental(k){const s=["G","D","A","E","B","F#","C#"],f=["F","Bb","Eb","Ab","Db","Gb","Cb"];return s.includes(k)?"sharp":f.includes(k)?"flat":"sharp";}
function noteName(pc,k){return(preferAccidental(k)==="flat"?NOTES_FLAT:NOTES_SHARP)[pc];}
function degreeName(pc,rpc){return["1","b2","2","b3","3","4","b5","5","b6","6","b7","7"][norm(pc-rpc)];}
const board=document.getElementById('board');
const keySel=document.getElementById('keySel');
const scaleSel=document.getElementById('scaleSel');
const labelSel=document.getElementById('labelSel');
const upBtn=document.getElementById('strumUpBtn');
const saveSnapBtn=document.getElementById('saveSnapBtn');
const chordPanel=document.getElementById('chordPanel');
const snapshots=document.getElementById('snapshots');
let markedByString=[];
function getMarkedMidis(){return markedByString.filter(Boolean).map(g=>+g.dataset.midi);}
function getSelectionInfo(){
const pcs=Array.from(new Set(getMarkedMidis().map(m=>norm(m))));
let bassPc=null;
for(let s=5;s>=0;s--){const g=markedByString[s];if(g&&g.dataset.midi){bassPc=norm(+g.dataset.midi);break;}}
return{pcs,bassPc};
}
function playGuitarNotes(midis,delay=0){
ensureAudio();
midis.forEach((m,i)=>{
const t=audioCtx.currentTime+i*delay,f0=midiToFreq(m);
const osc=audioCtx.createOscillator(),g=audioCtx.createGain();
const real=new Float32Array([0,1,.45,.22,.11,.06]),imag=new Float32Array(real.length);
osc.setPeriodicWave(audioCtx.createPeriodicWave(real,imag));
osc.frequency.setValueAtTime(f0,t);
g.gain.setValueAtTime(.0001,t);g.gain.exponentialRampToValueAtTime(.5,t+.01);g.gain.exponentialRampToValueAtTime(.0001,t+1);
osc.connect(g);g.connect(audioCtx.destination);osc.start(t);osc.stop(t+1.1);
});
}
upBtn.addEventListener('click',()=>playGuitarNotes(getMarkedMidis().reverse(),.04));
const CHORD_TEMPLATES=[
{q:'5',iv:[0,7]},{q:'maj',iv:[0,4,7]},{q:'m',iv:[0,3,7]},{q:'aug',iv:[0,4,8]},{q:'dim',iv:[0,3,6]},
{q:'sus2',iv:[0,2,7]},{q:'sus4',iv:[0,5,7]},{q:'7',iv:[0,4,7,10]},{q:'maj7',iv:[0,4,7,11]},
{q:'m7',iv:[0,3,7,10]},{q:'m7b5',iv:[0,3,6,10]},{q:'dim7',iv:[0,3,6,9]},
{q:'6',iv:[0,4,7,9]},{q:'min6',iv:[0,3,7,9]},{q:'add9',iv:[0,4,7,14]},{q:'maj6/9',iv:[0,4,7,9,14]},
{q:'9',iv:[0,4,7,10,14]},{q:'maj9',iv:[0,4,7,11,14]},{q:'min9',iv:[0,3,7,10,14]},{q:'11',iv:[0,4,7,10,14,17]},{q:'13',iv:[0,4,7,10,14,21]}
];
function chordSetFor(rpc,iv){return new Set(iv.map(n=>norm(rpc+n)));}
function scoreFit(sel,cs){let inter=0;sel.forEach(pc=>{if(cs.has(pc))inter++;});return{score:(cs.size-inter)*10+(sel.size-inter)*3-inter*.1};}
function degreeLabel(n){if(n>=21)return'13';if(n>=17)return'11';if(n>=14)return'9';return({0:'1',1:'♭2',2:'2',3:'♭3',4:'3',5:'4',6:'♭5',7:'5',8:'♯5',9:'6',10:'♭7',11:'7'})[norm(n)]||'?';}
function findBestChord(selPcs,keyName,bassPc){
if(!selPcs.length)return null;
const selSet=new Set(selPcs);let best=null;
for(let root=0;root<12;root++){
for(const tpl of CHORD_TEMPLATES){
const cset=chordSetFor(root,tpl.iv);
let total=scoreFit(selSet,cset).score;
if(bassPc!==null){if(root===bassPc)total-=6;else if(!cset.has(bassPc))total+=6;else total+=2;}
if(!best||total<best.total){
const rootName=noteName(root,keyName);
const chordTones=Array.from(cset).sort((a,b)=>a-b).map(pc=>noteName(pc,keyName));
const missingNames=Array.from(cset).filter(pc=>!selSet.has(pc)).map(pc=>noteName(pc,keyName));
const extraNames=Array.from(selSet).filter(pc=>!cset.has(pc)).map(pc=>noteName(pc,keyName));
let label=`${rootName}${tpl.q}`;
if(bassPc!==null&&cset.has(bassPc)&&bassPc!==root)label+=`/${noteName(bassPc,keyName)}`;
best={root,q:tpl.q,set:cset,total,iv:tpl.iv,label,chordTones,missingNames,extraNames};
}
}
}
return best;
}
function updateChordPanel(){
const{pcs,bassPc}=getSelectionInfo();
if(!pcs.length){chordPanel.textContent='目前未選音。點選各弦上的圓點來標記，這裡會顯示和絃。';saveSnapBtn.disabled=true;return;}
const best=findBestChord(pcs,keySel.value,bassPc);
if(!best){chordPanel.textContent='找不到合適的和絃。';saveSnapBtn.disabled=true;return;}
const parts=[`和絃：${best.label}`];
const ctLine=(labelSel.value==='degree')?best.iv.map(d=>degreeLabel(d)).join(' '):best.chordTones.join(' ');
parts.push(`和弦音：${ctLine}`);
if(best.missingNames?.length)parts.push(`少：${best.missingNames.join(' ')}`);
if(best.extraNames?.length)parts.push(`多：${best.extraNames.join(' ')}`);
chordPanel.textContent=parts.join(' | ');saveSnapBtn.disabled=false;
}
function updatePlayBtns(){upBtn.disabled=!getMarkedMidis().length;updateChordPanel();}
function collectMarkedState(){
return Array.from({length:6},(_,s)=>{const g=markedByString[s];return g?{string:s,fret:+g.dataset.fret,midi:+g.dataset.midi}:{string:s,fret:null,midi:null};});
}
function renderChordChart(state,label){
const fretted=state.map(s=>s.fret).filter(f=>f!==null&&f>0);
const hasOpen=state.some(s=>s.fret===0);
let winStart=fretted.length?Math.min(...fretted):0;
let winEnd=fretted.length?Math.max(...fretted):0;
const winFrets=Math.max(3,winEnd-winStart+1);
const W=200,H=220,pad=18;
const gridW=W-2*pad,gridH=H-2*pad-20;
const sg=gridW/5,fg=gridH/winFrets;
let svg=`<svg class="snap-svg" viewBox="0 0 ${W} ${H}" xmlns="http://www.w3.org/2000/svg">
<rect x="0" y="0" width="${W}" height="${H}" rx="12" fill="none" stroke="var(--btn-border)"/>
<text x="${W/2}" y="${pad-4}" text-anchor="middle" font-size="14" font-weight="700" fill="currentColor">${label||''}</text>`;
for(let i=0;i<6;i++){const x=pad+i*sg;svg+=`<line x1="${x}" y1="${pad}" x2="${x}" y2="${pad+gridH}" stroke="currentColor" stroke-opacity="0.3" stroke-width="1.5"/>`;}
for(let f=0;f<=winFrets;f++){const y=pad+f*fg,nut=hasOpen&&f===0;svg+=`<line x1="${pad}" y1="${y}" x2="${pad+gridW}" y2="${y}" stroke="currentColor" stroke-opacity="0.4" stroke-width="${nut?6:2}"/>`;}
if(!hasOpen&&winStart>0)svg+=`<text x="${pad-6}" y="${pad+fg*.9}" text-anchor="end" font-size="12" fill="currentColor">${winStart}</text>`;
state.forEach(s=>{
const col=5-s.string,x=pad+col*sg;
if(s.fret===null){svg+=`<text x="${x}" y="${pad-6}" text-anchor="middle" font-size="12" fill="currentColor" opacity="0.5">x</text>`;return;}
if(s.fret===0){svg+=`<circle cx="${x}" cy="${pad-8}" r="4.5" fill="none" stroke="currentColor" stroke-width="2"/>`;return;}
const y=pad+(s.fret-winStart+.5)*fg;
svg+=`<circle cx="${x}" cy="${y}" r="8" fill="var(--custard)" fill-opacity="0.9"/>`;
});
return svg+`</svg>`;
}
saveSnapBtn.addEventListener('click',()=>{
const{pcs,bassPc}=getSelectionInfo();if(!pcs.length)return;
const best=findBestChord(pcs,keySel.value,bassPc);
const state=collectMarkedState();
const label=best?best.label:'未命名';
const svg=renderChordChart(state,label);
const notes=state.map(s=>(s.fret===null||s.midi==null)?'x':noteName(norm(s.midi),keySel.value));
const card=document.createElement('div');card.className='snap-card';
card.innerHTML=`<div class="snap-head"><span class="snap-title">${label}</span><button class="snap-del">刪除</button></div>${svg}<div class="snap-notes">弦(6→1)：${notes.slice().reverse().join(' · ')}</div>`;
card.querySelector('.snap-del').addEventListener('click',e=>{e.stopPropagation();card.remove();});
card.addEventListener('click',e=>{if(e.target.classList.contains('snap-del'))return;const midis=state.filter(s=>s.midi).map(s=>s.midi).reverse();if(midis.length)playGuitarNotes(midis,.04);});
snapshots.prepend(card);
});
function buildBoard(){
markedByString=[];
const keyName=keySel.value,scaleKey=scaleSel.value;
const rootPc=(NOTES_SHARP.includes(keyName)?NOTES_SHARP.indexOf(keyName):NOTES_FLAT.indexOf(keyName));
const scalePcs=new Set((SCALES[scaleKey]||[]).map(s=>norm(rootPc+s)));
board.setAttribute('viewBox','0 0 1600 300');board.innerHTML='';
// Explicit white background for the whole SVG
const svgBg=document.createElementNS('http://www.w3.org/2000/svg','rect');
svgBg.setAttribute('x',0);svgBg.setAttribute('y',0);
svgBg.setAttribute('width','100%');svgBg.setAttribute('height','100%');
const isDarkMode = document.body.classList.contains('dark-theme');
svgBg.setAttribute('fill', isDarkMode ? '#191919' : '#ffffff');
board.appendChild(svgBg);
const fbX=60,fbY=24,fbW=1430,fbH=252,frets=24,strings=6;
const bg=document.createElementNS('http://www.w3.org/2000/svg','rect');
bg.setAttribute('x',fbX+fbW*(1/(frets+.5)));bg.setAttribute('y',fbY);
bg.setAttribute('width',fbW-fbW*(1/(frets+.5)));bg.setAttribute('height',fbH);
bg.setAttribute('class','fret-bg');board.appendChild(bg);
for(let s=0;s<strings;s++){
const y=fbY+fbH*(s+.5)/strings;
const l=document.createElementNS('http://www.w3.org/2000/svg','line');
l.setAttribute('x1',fbX+fbW*(1/(frets+.5)));l.setAttribute('x2',fbX+fbW);
l.setAttribute('y1',y);l.setAttribute('y2',y);l.setAttribute('class','string');board.appendChild(l);
}
for(let f=1;f<=frets;f++){
const x=fbX+fbW*(f/(frets+.5));
const l=document.createElementNS('http://www.w3.org/2000/svg','line');
l.setAttribute('x1',x);l.setAttribute('x2',x);l.setAttribute('y1',fbY);l.setAttribute('y2',fbY+fbH);
l.setAttribute('class',f===1?'fret first-fret':'fret');board.appendChild(l);
if([4,6,8,10,16,18,20,22].includes(f)){
const cx=x-fbW/(frets+.5)/2,c=document.createElementNS('http://www.w3.org/2000/svg','circle');
c.setAttribute('cx',cx);c.setAttribute('cy',fbY+fbH/2);c.setAttribute('r',6);c.setAttribute('class','marker-dot');board.appendChild(c);
}
if(f===13){
[fbY+fbH/3,fbY+fbH*2/3].forEach(y=>{const c=document.createElementNS('http://www.w3.org/2000/svg','circle');c.setAttribute('cx',x-fbW/(frets+.5)/2);c.setAttribute('cy',y);c.setAttribute('r',6);c.setAttribute('class','marker-dot');board.appendChild(c);});
}
}
function parseNote(tok){const m=tok.match(/^([A-G](?:#|b)?)(\d)$/);const name=m[1],oct=+m[2];const pc=(NOTES_SHARP.indexOf(name)>=0?NOTES_SHARP.indexOf(name):NOTES_FLAT.indexOf(name));return{pc,midi:(oct+1)*12+pc};}
const tuning=STANDARD_TUNING.map(parseNote);
for(let s=0;s<strings;s++){
const open=tuning[s];
for(let f=0;f<=frets;f++){
const midi=open.midi+f,pc=norm(open.pc+f);
const cx=fbX+fbW*((f+.5)/(frets+.5)),cy=fbY+fbH*(s+.5)/strings;
const g=document.createElementNS('http://www.w3.org/2000/svg','g');
g.setAttribute('class','note');g.dataset.midi=midi;g.dataset.string=s;g.dataset.fret=f;
const dot=document.createElementNS('http://www.w3.org/2000/svg','circle');
dot.setAttribute('cx',cx);dot.setAttribute('cy',cy);dot.setAttribute('r',12);
dot.setAttribute('fill', isDarkMode ? '#252523' : '#ffffff');
const inScale = scaleKey==='none' || scalePcs.has(pc);
if(inScale) g.classList.add('in-scale');
const lbl=document.createElementNS('http://www.w3.org/2000/svg','text');
lbl.setAttribute('x',cx);lbl.setAttribute('y',cy+3.5);
lbl.setAttribute('text-anchor','middle');lbl.setAttribute('font-size','11');
lbl.textContent=(labelSel.value==='degree'&&scaleKey!=='none')?degreeName(pc,rootPc):noteName(pc,keySel.value);
g.appendChild(dot);g.appendChild(lbl);board.appendChild(g);
g.addEventListener('click',()=>{
playGuitarNotes([midi]);
if(g.classList.contains('marked')){
g.classList.remove('marked');
markedByString[s]=null;
} else {
if(markedByString[s]?.isConnected){
markedByString[s].classList.remove('marked');
}
g.classList.add('marked');
markedByString[s]=g;
}
updatePlayBtns();
});
}
}
updatePlayBtns();
}
[keySel,scaleSel,labelSel].forEach(el=>el.addEventListener('change',buildBoard));
buildBoard();
/* ════════════════════════════════════════════════════════
PROFESSIONAL TAB EDITOR
════════════════════════════════════════════════════════ */
const DUR_BEATS = { w:4, h:2, q:1, '8':.5, '16':.25 };
const TECH_LABEL = { h:'h', p:'p', slide_up:'/', slide_down:'\\', bend:'b', vibrato:'~', mute:'x' };
const MEASURES_PER_LINE = 4;
const LINE_H = 190;
const SCORE_W_MAX = 920; // max SVG width
const CLEF_W = 88; // space taken by clef + time sig in first measure
const MARGIN_W = 24; // left margin in subsequent measures
const MIN_NOTE_W = 28; // minimum px per quarter-beat slot
const NOTE_W = { 'w':4, 'h':2, 'q':1, '8':0.5, '16':0.25 }; // beats per duration
// Calculate minimum width needed for a measure in quarter-beat units
function measureMinBeats(measure) {
return measure.beats.reduce((s,b) => s + (NOTE_W[b.duration]||1), 0);
}
// Calculate px width for a measure given its content
function calcStaveW(measure, isFirst) {
const beats = measureMinBeats(measure);
const minW = isFirst ? CLEF_W : MARGIN_W;
// Each quarter-beat gets at least MIN_NOTE_W px
// 16th note (0.25 beats) → needs ~28px; quarter (1 beat) → 28px
const contentW = Math.max(beats * MIN_NOTE_W * 1.8, MIN_NOTE_W * 4);
return Math.round(minW + contentW);
}
let tabMeasures = [], tabCursor = {m:0,b:0,s:1}, tabSelectedDur = 'q';
let fretBuffer = '', fretTimer = null;
let _notePositions = [], _staveStringYs = {}, _measureLineIdx = {};
function makeBeat(dur){ return {duration:dur||tabSelectedDur, strings:[], technique:null, isRest:false}; }
function makeMeasure(ts){ return {timeSig:ts||'4/4', beats:[makeBeat('q')]}; }
tabMeasures = [makeMeasure('4/4')];
function clampCursor(){
tabCursor.m = Math.max(0,Math.min(tabCursor.m,tabMeasures.length-1));
tabCursor.b = Math.max(0,Math.min(tabCursor.b,tabMeasures[tabCursor.m].beats.length-1));
tabCursor.s = Math.max(1,Math.min(tabCursor.s,6));
}
function cursorNext(){
const bl=tabMeasures[tabCursor.m].beats.length;
if(tabCursor.b<bl-1)tabCursor.b++;
else if(tabCursor.m<tabMeasures.length-1){tabCursor.m++;tabCursor.b=0;}
}
function cursorPrev(){
if(tabCursor.b>0)tabCursor.b--;
else if(tabCursor.m>0){tabCursor.m--;tabCursor.b=tabMeasures[tabCursor.m].beats.length-1;}
}
function updateCursorUI(){
document.getElementById('curM').textContent=tabCursor.m+1;
document.getElementById('curB').textContent=tabCursor.b+1;
document.getElementById('curS').textContent=tabCursor.s;
document.getElementById('measureCount').textContent=tabMeasures.length;
}
function addBeatIfNeeded(){
const m=tabMeasures[tabCursor.m];
const[n,d]=m.timeSig.split('/').map(Number);
const cap=(n/d)*4;
const used=m.beats.reduce((s,b)=>s+DUR_BEATS[b.duration],0);
if(tabCursor.b===m.beats.length-1&&used<cap-0.001) m.beats.push(makeBeat(tabSelectedDur));
}
function commitNote(fret,isRest){
const beat=tabMeasures[tabCursor.m].beats[tabCursor.b];
beat.duration=tabSelectedDur;
if(isRest){beat.isRest=true;beat.strings=[];}
else{
if(fret<0||fret>24){setStatus('格數需介於 0–24','err');return;}
beat.isRest=false;
beat.strings=beat.strings.filter(n=>n.string!==tabCursor.s);
beat.strings.push({string:tabCursor.s,fret});
beat.strings.sort((a,b)=>a.string-b.string);
}
setStatus(isRest?`休止符 @ M${tabCursor.m+1}B${tabCursor.b+1}`:`弦${tabCursor.s}品${fret} @ M${tabCursor.m+1}B${tabCursor.b+1}`);
addBeatIfNeeded();
cursorNext();
clampCursor();
renderScore();
updateCursorUI();
}
function deleteCurrentNote(){
const beat=tabMeasures[tabCursor.m].beats[tabCursor.b];
beat.strings=beat.strings.filter(n=>n.string!==tabCursor.s);
if(!beat.strings.length)beat.isRest=false;
renderScore();updateCursorUI();setStatus('已刪除');
}
function applyTechnique(tech){
const beat=tabMeasures[tabCursor.m].beats[tabCursor.b];
if(tech===null){
beat.technique=null;
document.querySelectorAll('.tech-btn').forEach(b=>b.classList.remove('active'));
setStatus('已清除技巧');
} else {
beat.technique=tech;
document.querySelectorAll('.tech-btn[data-tech]').forEach(b=>b.classList.toggle('active',b.dataset.tech===tech));
const nm={h:'Hammer-on',p:'Pull-off',slide_up:'Slide Up',slide_down:'Slide Down',bend:'Bend',vibrato:'Vibrato',mute:'Mute'};
setStatus(`套用：${nm[tech]||tech}`);
}
renderScore();
}
function addTabMeasure(){
tabMeasures.push(makeMeasure(document.getElementById('timeSigSel').value));
renderScore();updateCursorUI();setStatus(`新增第${tabMeasures.length}小節`);
}
function deleteTabMeasure(){
if(tabMeasures.length<=1){setStatus('至少保留一小節','warn');return;}
tabMeasures.pop();
if(tabCursor.m>=tabMeasures.length){tabCursor.m=tabMeasures.length-1;tabCursor.b=0;}
clampCursor();renderScore();updateCursorUI();setStatus('已刪除最後一小節');
}
/* ── VexFlow Renderer ── */
function renderScore(){
_notePositions=[];_staveStringYs={};_measureLineIdx={};
const container=document.getElementById('scoreContainer');
container.innerHTML='';
const{Renderer,TabNote,TabStave,Voice,Formatter,Annotation,Beam}=Vex.Flow;
// ── Build lines: pack measures until line is full ──
const lines = []; // each line = array of measure indices
let curLine = [];
let curW = 0;
for(let mi=0; mi<tabMeasures.length; mi++){
const measure = tabMeasures[mi];
const isFirst = curLine.length === 0;
const mw = calcStaveW(measure, isFirst);
// If adding this measure would exceed max width AND line is not empty → wrap
if(curW + mw > SCORE_W_MAX && curLine.length > 0){
lines.push(curLine);
curLine = [mi];
curW = calcStaveW(measure, true); // now it's first in new line
} else {
curLine.push(mi);
curW += mw;
}
}
if(curLine.length > 0) lines.push(curLine);
// Record which line each measure is on
lines.forEach((line, li) => line.forEach(mi => _measureLineIdx[mi] = li));
// ── Determine SVG width per line (stretch last measure to fill) ──
const totalSvgH = lines.length * LINE_H + 30;
// Use max line width across all lines for SVG width
let maxLineW = 0;
lines.forEach(line => {
const lw = line.reduce((s,mi,i)=>s+calcStaveW(tabMeasures[mi],i===0),0);
if(lw > maxLineW) maxLineW = lw;
});
const SCORE_W = Math.min(SCORE_W_MAX, Math.max(400, maxLineW + 10));
const renderer=new Renderer(container,Renderer.Backends.SVG);
renderer.resize(SCORE_W, totalSvgH);
const ctx=renderer.getContext();
ctx.setFont('Courier Prime, monospace',10);
ctx.setFillStyle('#111');ctx.setStrokeStyle('#111');
lines.forEach((line, lineIdx) => {
const yBase = lineIdx * LINE_H + 35;
// Compute raw widths for this line
const rawWidths = line.map((mi,i) => calcStaveW(tabMeasures[mi], i===0));
const rawTotal = rawWidths.reduce((s,w)=>s+w,0);
// Scale to fill SCORE_W
const scale = SCORE_W / rawTotal;
const staveWidths = rawWidths.map(w => Math.floor(w * scale));
// Give remainder to last measure
const diff = SCORE_W - staveWidths.reduce((s,w)=>s+w,0);
staveWidths[staveWidths.length-1] += diff;
let xOff = 0;
line.forEach((mi, posInLine) => {
const measure = tabMeasures[mi];
const isFirst = posInLine === 0;
const staveW = staveWidths[posInLine];
const isCurrent = mi === tabCursor.m;
const stave=new TabStave(xOff, yBase, staveW-4);
if(isFirst){
stave.addClef('tab');
const[n,d]=measure.timeSig.split('/').map(Number);
stave.addTimeSignature(`${n}/${d}`);
}
stave.setContext(ctx).draw();
// Record string Y positions
if(isFirst){
_staveStringYs[lineIdx]=[0,1,2,3,4,5].map(i=>stave.getYForLine(i));
}
// Measure number
ctx.save();
ctx.setFont('Courier Prime, monospace',8);
ctx.setFillStyle(isCurrent?'#888':'#bbb');
ctx.fillText(`${mi+1}`,xOff+3,yBase-2);
ctx.restore();
const vfNotes=buildVFNotes(measure,mi);
const innerW = staveW - (isFirst ? CLEF_W+4 : MARGIN_W+4);
const noteStartX = xOff + (isFirst ? CLEF_W+4 : MARGIN_W+4);
if(vfNotes.length>0){
try{
const[n,d]=measure.timeSig.split('/').map(Number);
const voice=new Voice({numBeats:n,beatValue:d});
voice.setMode(Voice.Mode.SOFT);
voice.addTickables(vfNotes);
new Formatter().joinVoices([voice]).format([voice], innerW);
voice.draw(ctx,stave);
const beamGroups=Beam.generateBeams(vfNotes);
beamGroups.forEach(beam=>beam.setContext(ctx).draw());
vfNotes.forEach((note,bi)=>{
try{
const absX = note.getAbsoluteX();
const bb = note.getBoundingBox();
const x = absX || (bb ? bb.getX()+bb.getW()/2 : noteStartX+innerW/vfNotes.length*bi);
_notePositions.push({mi,bi,x});
}catch(e){
const step=innerW/Math.max(vfNotes.length,1);
_notePositions.push({mi,bi,x:noteStartX+step*bi+step*0.5});
}
});
}catch(err){
const step = innerW / Math.max(vfNotes.length,1);
vfNotes.forEach((_,bi)=>{
_notePositions.push({mi,bi,x:noteStartX + step*bi + step*0.5});
});
}
}
xOff+=staveW;
});
});
refreshTabHeader();
requestAnimationFrame(drawCursorOverlay);
}
function buildVFNotes(measure,mi){
const{TabNote,Annotation}=Vex.Flow;
return measure.beats.map((beat,bi)=>{
const positions=beat.isRest||!beat.strings.length
?[{str:3,fret:beat.isRest?'x':''}]
:beat.strings.map(n=>({str:n.string,fret:n.technique==='mute'?'x':String(n.fret)}));
let note;
try{
note=new TabNote({
positions:positions.length?positions:[{str:3,fret:'0'}],
duration:beat.duration,
draw_stem:true,
stem_direction:1
});
}
catch(e){
note=new TabNote({positions:[{str:3,fret:'0'}],duration:'q',draw_stem:true,stem_direction:1});
}
if(beat.technique&&TECH_LABEL[beat.technique]){
try{
const ann=new Annotation(TECH_LABEL[beat.technique]);
ann.setFont('Courier Prime, monospace',10,'bold');
ann.setVerticalJustification(Annotation.VerticalJustify.BOTTOM);
note.addModifier(ann,0);
}catch(e){}
}
return note;
}).filter(Boolean);