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Lesson 2: replace text tab with fretboard SVG

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Sterling Archer committed 2026-06-13 21:10:01 -07:00
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commit 2a79d766fd
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index.html
+73 -25
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@@ -844,33 +844,81 @@ function LessonBody({ id, detected, onTarget, listening, onStartMic }) {
<p style={{fontSize:14,color:C.muted}}>Strings thick to thin: <strong style={{color:C.text}}>E A D G B e</strong> - remember with "Elephants And Donkeys Grow Big Ears."</p>
</div>
);
if (id === 1) return (
<div>
<p style={{color:"#C8C5BE",fontSize:15,lineHeight:1.75,marginBottom:14}}>Tab shows you exactly where to put your fingers. No music theory needed. Each line is a string, numbers are frets.</p>
<div style={{background:"#111115",borderRadius:10,padding:"18px 22px",border:"1px solid "+C.fret,overflowX:"auto"}}>
{[
{s:"e",v:["--","0","--","--","--","3","--"]},
{s:"B",v:["--","--","0","--","--","3","--"]},
{s:"G",v:["--","--","--","0","--","0","--"]},
{s:"D",v:["--","--","--","--","--","0","--"]},
{s:"A",v:["--","--","--","--","--","2","--"]},
{s:"E",v:["0","--","--","--","--","3","--"]},
].map(({s,v})=>(
<div key={s} style={{display:"flex",alignItems:"center",height:26}}>
<span style={{fontFamily:"monospace",fontSize:13,fontWeight:600,color:C.amber,width:22}}>{s}</span>
<span style={{fontFamily:"monospace",fontSize:13,color:C.string,marginRight:4}}>|</span>
{v.map((val,i)=>(
<span key={i} style={{fontFamily:"monospace",fontSize:14,width:22,textAlign:"center",
color:val==="--"?C.string:i>=5?C.amber:C.text,fontWeight:val!=="--"?600:400}}>
{val}
</span>
if (id === 1) {
const NUM_FRETS=5, NS=6, W=320, H=200;
const TOP=44, BOT=H-24, LEFT=44, RIGHT=W-12;
const strGap=(BOT-TOP)/(NS-1);
const fretGap=(RIGHT-LEFT)/NUM_FRETS;
const LABELS=["E","A","D","G","B","e"];
// Two example notes: open E (str0 fret0), G chord shape highlight (str5 fret3)
// Single notes to demo: 1=open E2(str0,fr0), 2=open e(str5,fr0), 3=G chord(str0,fr3 + str5,fr3)
const demoNotes=[
{str:0,fret:0,label:"1",note:"E2",desc:"Open Low E"},
{str:5,fret:0,label:"2",note:"e4",desc:"Open High e"},
{str:0,fret:3,label:"3",note:"G",desc:"Fret 3"},
{str:5,fret:3,label:"4",note:"G",desc:"Fret 3"},
{str:1,fret:2,label:"5",note:"B",desc:"Fret 2"},
];
return (
<div>
<p style={{color:"#C8C5BE",fontSize:15,lineHeight:1.75,marginBottom:14}}>
Each line is a string on your guitar. Numbers tell you which fret to press. 0 means open - no fingers needed.
</p>
<div style={{background:"#0A0A0E",borderRadius:10,padding:"10px 6px",border:"1px solid "+C.fret,marginBottom:16}}>
<div style={{textAlign:"center",fontSize:12,color:C.muted,marginBottom:8}}>Example - a G chord</div>
<svg width={W} height={H} style={{display:"block",margin:"0 auto"}}>
<line x1={LEFT} y1={TOP-2} x2={LEFT} y2={BOT+2} stroke={C.text} strokeWidth={3}/>
{Array.from({length:NUM_FRETS+1},(_,f)=>(
<line key={f} x1={LEFT+f*fretGap} y1={TOP} x2={LEFT+f*fretGap} y2={BOT} stroke={C.fret} strokeWidth={1}/>
))}
</div>
))}
{Array.from({length:NS},(_,s)=>(
<line key={s} x1={LEFT} y1={TOP+s*strGap} x2={RIGHT} y2={TOP+s*strGap}
stroke={C.string} strokeWidth={s===0?2:s===5?0.8:1.2}/>
))}
{LABELS.map((n,s)=>(
<text key={s} x={LEFT-10} y={TOP+s*strGap+4} textAnchor="middle"
fontSize={10} fill={C.amber} fontFamily="monospace" fontWeight="600">{n}</text>
))}
{Array.from({length:NUM_FRETS},(_,f)=>(
<text key={f} x={LEFT+(f+0.5)*fretGap} y={BOT+16} textAnchor="middle"
fontSize={9} fill={C.muted} fontFamily="monospace">{f+1}</text>
))}
{/* Open string circles left of nut */}
<circle cx={LEFT-13} cy={TOP+0*strGap} r={7} fill="none" stroke={C.sage} strokeWidth={2}/>
<text x={LEFT-13} y={TOP+0*strGap+4} textAnchor="middle" fontSize={9} fill={C.sage} fontFamily="monospace" fontWeight="700">0</text>
<circle cx={LEFT-13} cy={TOP+5*strGap} r={7} fill="none" stroke={C.sage} strokeWidth={2}/>
<text x={LEFT-13} y={TOP+5*strGap+4} textAnchor="middle" fontSize={9} fill={C.sage} fontFamily="monospace" fontWeight="700">0</text>
{/* Fretted dots */}
{[{s:0,f:3,n:"G"},{s:1,f:2,n:"A"},{s:4,f:2,n:"B"},{s:5,f:3,n:"G"}].map(({s,f,n},i)=>{
const cx=LEFT+(f-0.5)*fretGap, cy=TOP+s*strGap;
return (
<g key={i}>
<circle cx={cx} cy={cy} r={14} fill="rgba(212,168,71,0.12)"/>
<circle cx={cx} cy={cy} r={11} fill={C.amber}/>
<text x={cx} y={cy+5} textAnchor="middle" fontSize={12}
fill="#1A1A1F" fontWeight="900" fontFamily="monospace">{n}</text>
</g>
);
})}
{/* Muted strings */}
{[2,3].map(s=>{
const cy=TOP+s*strGap;
return (
<g key={s}>
<line x1={LEFT-18} y1={cy-6} x2={LEFT-8} y2={cy+6} stroke={C.coral} strokeWidth={2}/>
<line x1={LEFT-8} y1={cy-6} x2={LEFT-18} y2={cy+6} stroke={C.coral} strokeWidth={2}/>
</g>
);
})}
</svg>
</div>
<Tip>0 = open string (no fingers). A number = press that fret. X = don't play that string. Green O = open, play it.</Tip>
<p style={{color:"#C8C5BE",fontSize:14,lineHeight:1.7,marginTop:12}}>
The top string (E) is the thickest - the one closest to you when you hold the guitar. The bottom (e) is the thinnest.
</p>
</div>
<Tip>Read left to right. 0 = open string. 2 = press 2nd fret. Numbers stacked vertically = chord.</Tip>
</div>
);
);
}
const [stringsComplete, setStringsComplete] = useState(false);
if (id === 2) return (
<div>