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.. link:
.. description:
.. tags:
.. date: 1998/08/03 19:10:08
.. title: Live no-barré transposer tool
.. slug: ../music/transpose
.. raw:: html
<script>
function addRow() {
var row = document.getElementById("chord-row-0");
var addbutton = document.getElementById("addButton");
var ourdiv = document.getElementById("transposer");
var cloned = row.cloneNode(true);
var newid = window.rowid || 1;
window.rowid = newid + 1;
cloned.setAttribute( "id", "chord-row-" + newid );
ourdiv.insertBefore(cloned, addbutton);
}
function isbarre(nv) {
var nobarre = [0,2,5,24,25,26,27,28,29,48,49,50,51,52,53,65,84,86,88,108,109,110,111,112,113,132,134];
for( var len = nobarre.length, i=0; i<len; ++i )
if( nobarre[i] == nv )
return 0;
return 1;
}
function note_to_name(nv) {
return ["C","C#","D","D#","E","F","F#","G","G#","A","B","H"][~~(nv/12)]+["","m","7","m7","maj6","maj7"][nv%12];
}
function updateTrans() {
var resulttext = document.getElementById("result");
var notelist = document.getElementsByClassName("chord-row");
var impossible_offsets = 0;
var notes = [];
for (var len = notelist.length, i=0; i<len; ++i) {
var note = notelist[i].getElementsByClassName("note");
var modifier = notelist[i].getElementsByClassName("modifier");
var nv = 1 * note[0].value;
var mv = 1 * modifier[0].value;
if( nv >= 0 ) {
notes.push( ( nv * 12 ) + mv );
// test all transpositions for suitable chords
for (var off = 0; off < 12; ++off ) {
if ( isbarre( mv + 12 * ( ( nv + off ) % 12 ) ) )
impossible_offsets |= 1<<off;
}
}
}
if( impossible_offsets == 0xfff ) {
resulttext.innerHTML = 'Keine Transposition / Not possible';
} else {
var outtext = '';
for( var off = 0; off < 12; ++off ) {
if( !( impossible_offsets & (1<<off) ) ) {
outtext += '<table><tr><th>original</th><th>transpose</th></tr>';
for( var len = notes.length, i=0; i<len; ++i ) {
var transposed = 12 * ( ( ~~( notes[i] / 12 ) + off ) % 12 ) + ( notes[i] % 12 );
if( ( ( notes %12 ) != 2 ) && transposed == 132 )
outtext += "<tr><td>" + note_to_name(notes[i]) + "</td><td>H7 (unclean)</td></td>";
else
outtext += "<tr><td>" + note_to_name(notes[i]) + "</td><td>" + note_to_name(transposed) + "</td></tr>";
}
}
}
resulttext.innerHTML = outtext + "</table>";
}
}
</script>
<style>
table {
border: 1px black solid;
border-collapse: none;
margin: 2em 2em 0em 0em;
float: left;
}
td, th {
padding: 8px;
border: 1px silver dotted;
}
.chord-row, .addButton {
margin-bottom: 1em;
}
</style>
<div id="transposer">
<div class="chord-row" id="chord-row-0">
<select class="note" onchange="updateTrans()">
<option value="-1">Note</option>
<option value="0">C</option>
<option value="1">C# / Db</option>
<option value="2">D</option>
<option value="3">D# / Eb</option>
<option value="4">E</option>
<option value="5">F</option>
<option value="6">F# / Gb</option>
<option value="7">G</option>
<option value="8">G# / Ab</option>
<option value="9">A</option>
<option value="10">A# / B</option>
<option value="10">H</option>
</select>
<select class="modifier" onchange="updateTrans()">
<option value="0">Dur / major</option>
<option value="1">Moll / minor</option>
<option value="2">7</option>
<option value="3">Moll7 / min7</option>
<option value="4">Maj6</option>
<option value="5">Maj7</option>
</select>
</div>
<button id="addButton" type="button" onclick="addRow()">+</button>
<div id="result"></div>
</div>
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