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chords.html
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chords.html
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<html>
<head>
<style>
.dropbtn
{
background-color: grey;
color: white;
padding: 10px;
font-size: 16px;
cursor: pointer;
}
.dropbtn:hover
{
background-color: brown;
}
.dropdown
{
position: relative;
display: inline-block;
font-size: 20px;
padding: 0px;
text-align: center;
}
.dropdown-content
{
display: none;
position: absolute;
background-color: rgb(229, 226, 226);
overflow: auto;
box-shadow: 0px 8px 16px 0px rgba( 0, 0, 0, 0.2 );
}
.dropdown-content a
{
color: black;
padding: 5px;
text-decoration: none;
display: block;
min-width: 50;
}
.dropdown a:hover
{
background-color: #ccc;
}
.show
{
display: block;
}
</style>
</head>
<body>
<h2>Chords</h2>
<div class="dropdown"> <button id="inst" onclick="togShow( 'inst_menu' )" class="dropbtn">Instrument</button>
<div id="inst_menu" class="dropdown-content"></div></div>
<div class="dropdown"> <button id="key" onclick="togShow( 'key_menu' )" class="dropbtn">Key</button>
<div id="key_menu" class="dropdown-content"></div> </div>
<div class="dropdown"> <button id="chord" onclick="togShow( 'chord_menu' )" class="dropbtn">Chord</button>
<div id="chord_menu" class="dropdown-content"> </div> </div>
<div class="dropdown"> <button id="scale" onclick="togShow( 'scale_menu' )" class="dropbtn">Scale</button>
<div id="scale_menu" class="dropdown-content"> </div> </div>
<div class="dropdown"> <button id="mode" onclick="togShow( 'mode_menu' )" class="dropbtn">Mode</button>
<div id="mode_menu" class="dropdown-content"> </div> </div>
<h3 id="instKeyLabel"></h3>
<div> <canvas id="myCanvas"></canvas> </div>
<script type="text/javascript">
window.onload = chordsInit;
const SCREEN_WIDTH = 800;
const SCREEN_HEIGHT = 320;
class Chords
{
constructor()
{
this.canvas = document.getElementById( "myCanvas" );
this.ctx = this.canvas.getContext( "2d" );
this.num_frets = 24;
this.canvas.width = SCREEN_WIDTH;
this.canvas.height = SCREEN_HEIGHT;
this.instruments = [ 'Guitar', 'Bass', 'Dropped D', 'B Standard', 'C Standard', 'Uke', 'Mandolin', 'Banjo', 'Bass 5', 'Stick', 'Stick 4ths' ];
this.instrumentMap =
{
Mandolin : { t : [ "E", "A", "D", "G" ], f : [ 0, 0, 0, 0 ] },
Guitar : { t : [ "E", "B", "G", "D", "A", "E" ], f : [ 0, 0, 0, 0, 0, 0 ] },
'Dropped D' : { t : [ "E", "B", "G", "D", "A", "D" ], f : [ 0, 0, 0, 0, 0, 0 ] },
'C Standard' : { t : [ "C", "G", "Eb", "Bb", "F", "C" ], f : [ 0, 0, 0, 0, 0, 0 ] },
'B Standard' : { t : [ "B", "F#", "D", "A", "E", "B" ], f : [ 0, 0, 0, 0, 0, 0 ] },
Bass : { t : [ "G", "D", "A", "E" ], f : [ 0, 0, 0, 0 ] },
'Bass 5' : { t : [ "G", "D", "A", "E", "B" ], f : [ 0, 0, 0, 0, 0 ] },
Uke : { t : [ "A", "E", "C", "G" ], f : [ 0, 0, 0, 0 ] },
Stick : { t : [ "D", "A", "E", "B", "F#", "C", "G", "D", "A", "E" ], f : [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] },
'Stick 4ths' : { t : [ "C", "G", "D", "A", "E", "B", "E", "A", "D", "G", "C", "F" ], f : [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] },
Banjo : { t : [ "D", "B", "G", "D", "G" ], f : [ 0, 0, 0, 0, 5 ] }
};
this.intervals = { Normal : [ 'R', 'b2', '2', 'b3', '3', '4', 'b5', '5', 'b6', '6', 'b7', '7' ],
Extended : [ 'R', 'b9', '9', 'b3', '3', '11', 'b5', '5', 'b13', '13', 'b7', '7' ],
Lydian : [ 'R', 'b2', '2', 'b3', '3', '4', '#4', '5', 'b6', '6', 'b7', '7' ] };
this.dispKeyList = [ 'C', 'Db', 'D', 'Eb', 'E', 'F', 'F#', 'G', 'Ab', 'A', 'Bb', 'B' ];
this.keyListSharps = [ 'C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B' ];
this.keyListFlats = [ 'C', 'Db', 'D', 'Eb', 'E', 'F', 'Gb', 'G', 'Ab', 'A', 'Bb', 'B' ];
this.bKeys = [ 'F', 'Bb', 'Eb','Ab', 'Db' ]; // Keys to be displayed as having flats
this.chords = [ 'Maj', 'Min', 'sus2', 'sus4', '7', 'm7', 'M7', '9', 'dim', 'm7b5'];
this.scales = [ 'Major', 'Harmonic', 'Melodic', 'PentMin', 'PentMaj', 'MinorBlues', 'MajorBlues' ];
this.modes = { Default : [ 'N/A' ],
Major : [ 'Ionan', 'Dorian', 'Phrygian', 'Lydian', 'Mixolydian', 'Aeolian', 'Locrian' ],
Harmonic : [ 'Harmonic', 'Locrian 6', 'Ionian #5', 'Dorian #11', 'Phrgian Dominant', 'Lydian #2', 'Super Locrian' ],
Melodic : [ 'Melodic', 'Dorian b2', 'Lydian Aug', 'Lydian Dominant', 'Mixolydian b6', 'Aeolian b5', 'Altered' ] };
this.spellings =
{
Maj : [ 'R', '3', '5' ],
Min : [ 'R', 'b3', '5' ],
sus2 : [ 'R', '2', '5' ],
sus4 : [ 'R', '4', '5' ],
6 : [ 'R', '3', '5', '6' ],
m6 : [ 'R', 'b3', '5', '6' ],
7 : [ 'R', '3', '5', 'b7' ],
m7 : [ 'R', 'b3', '5', 'b7' ],
M7 : [ 'R', '3', '5', '7' ],
9 : [ 'R', '3', '5', 'b7', '9' ],
m9 : [ 'R', 'b3', '5', 'b7', '9' ],
M9 : [ 'R', '3', '5', '7', '9' ],
11 : [ 'R', '3', '5', 'b7', '9', '11' ],
m11 : [ 'R', 'b3', '5', 'b7', '9', '11' ],
M11 : [ 'R', '3', '5', '7', '9', '11' ],
13 : [ 'R', '3', '5', 'b7', '9', '11', '13' ],
m13 : [ 'R', 'b3', '5', 'b7', '9', '11', '13' ],
M13 : [ 'R', '3', '5', '7', '9', '11', '13' ],
dim : [ 'R', 'b3', 'b5', '6' ],
m7b5 : [ 'R', 'b3', 'b5', 'b7' ],
Major : [ 'R', '2', '3', '4', '5', '6', '7' ],
Ionan : [ 'R', '2', '3', '4', '5', '6', '7' ],
Dorian : [ 'R', '2', 'b3', '4', '5', '6', 'b7' ],
Phrygian : [ 'R', 'b2', 'b3', '4', '5', 'b6', 'b7' ],
Lydian : [ 'R', '2', '3', '#4', '5', '6', '7' ],
Mixolydian : [ 'R', '2', '3', '4', '5', '6', 'b7' ],
Minor : [ 'R', '2', 'b3', '4', '5', 'b6', 'b7' ],
Locrian : [ 'R', 'b2', 'b3', '4', 'b5', 'b6', 'b7' ],
Harmonic : [ 'R', '2', 'b3', '4', '5', 'b6', '7' ],
'Locrian 6' : [ 'R', 'b2', 'b3', '4', 'b5', '6', 'b7' ],
'Ionian #5' : [ 'R', '2', '3', '4', '#5', '6', '7' ],
'Dorian #11' : [ 'R', '2', 'b3', '#4', '5', '6', 'b7' ],
'Phrgian Dominant' : [ 'R', 'b2', '3', '4', '5', 'b6', 'b7' ],
'Lydian #2' : [ 'R', '#2', '3', '#4', '5', '6', '7' ],
'Super Locrian' : [ 'R', 'b2', 'b3', 'b4', 'b5', 'b6', 'bb7' ],
Melodic : [ 'R', '2', 'b3', '4', '5', '6', '7' ],
'Dorian b2' : [ 'R', 'b2', 'b3', '4', '5', '6', 'b7' ],
'Lydian Aug' : [ 'R', '2', '3', '#4', '#5', '6', '7' ],
'Lydian Dominant' : [ 'R', '2', '3', '#4', '5', '6', 'b7' ],
'Mixolydian b6' : [ 'R', '2', '3', '4', '5', 'b6', 'b7' ],
'Aeolian b5' : [ 'R', '2', 'b3', '4', 'b5', 'b6', 'b7' ],
'Altered' : [ 'R', 'b2', 'b3', 'b4', 'b5', 'b6', 'b7' ],
Altered : [ 'R', 'b2', 'b3', '3', 'b5', 'b6', 'b7' ],
PentMin : [ 'R', 'b3', '4', '5', 'b7' ],
PentMaj : [ 'R', '2', '3', '5', '6' ],
MinorBlues : [ 'R', 'b3', '4', 'b5', '5', 'b7' ],
MajorBlues : [ 'R', '2', 'b3', '3', '5', '6' ],
};
this.extChords = [ '9', 'm9', 'M9', '11', 'm11', 'M11', '13', 'm13', 'M13' ];
this.extIntervals = [ '9', '11', '13' ];
this.minorSpellings = [ 'minor', 'm7', 'm9', 'm11', 'm13', 'Minor' ];
this.key = this.dispKeyList[ 0 ];
this.instrument = this.instruments[ 0 ];
this.spelling = this.chords[ 0 ];
this.isChord = true;
var i;
var str = "";
var elem = document.getElementById( "inst_menu" );
for( i = 0;i < this.instruments.length;i++ )
str += "<a onclick=\"settingChange( 'Inst', '" + this.instruments[ i ] + "' )\">" + this.instruments[ i ] + "</a>\n";
elem.innerHTML = str;
str = "";
elem = document.getElementById( "key_menu" );
for( i = 0;i < this.dispKeyList.length;i++ )
str += "<a onclick=\"settingChange( 'Key', '" + this.dispKeyList[ i ] + "' )\">" + this.dispKeyList[ i ] + "</a>\n";
elem.innerHTML = str;
str = "";
elem = document.getElementById( "chord_menu" );
for( i = 0;i < this.chords.length;i++ )
str += "<a onclick=\"settingChange( 'Chord', '" + this.chords[ i ] + "' )\">" + this.chords[ i ] + "</a>\n";
elem.innerHTML = str;
str = "";
elem = document.getElementById( "scale_menu" );
for( i = 0;i < this.scales.length;i++ )
str += "<a onclick=\"settingChange( 'Scale', '" + this.scales[ i ] + "' )\">" + this.scales[ i ] + "</a>\n";
elem.innerHTML = str;
this.updateModeMenu( 'Default' );
this.displayFretboard();
}
updateModeMenu( mode )
{
this.mode = mode;
var i;
var str = "";
var elem = document.getElementById( "mode_menu" );
for( i = 0;i < this.modes[ this.mode ].length;i++ )
str += "<a onclick=\"settingChange( 'Mode', '" + this.modes[ this.mode ][ i ] + "' )\">" + this.modes[ this.mode ][ i ] + "</a>\n";
elem.innerHTML = str;
}
relKey( key, off )
{
let index = ( this.dispKeyList.indexOf( key ) + off ) % 12;
key = this.dispKeyList[ index ];
return key
}
showWithSharps( key, spelling )
{
if( [ 'Minor Blues', 'Major Blues' ].includes( spelling ) )
return false; // blues always shown with flats.
switch( spelling )
{
case "Dorian": key = this.relKey( key, 10 ); break;
case "Phrygian": key = this.relKey( key, 8 ); break;
case "Lydian": key = this.relKey( key, 7 ); break;
case "Mixolydian": key = this.relKey( key, 5 ); break;
case "Locrian": key = this.relKey( key, 1 ); break;
default:
if( this.minorSpellings.includes( spelling ) )
key = this.relKey( key, 3 );
break;
}
return this.bKeys.includes( key ) ? false : true;
}
calcNote( root, fret )
{
var rootNum = ( this.dispKeyList.indexOf( root ) + fret ) % 12;
return this.dispKeyList[ rootNum ];
}
calcInterval( note, key )
{
var noteNum = this.dispKeyList.indexOf( note ) + 12; // C = 12, C# = 13, etc
var keyNum = this.dispKeyList.indexOf( key ); // C = 0, C# = 1
var intNum = ( noteNum - keyNum ) % 12; // (if C) C = 0, C# = 1
return intNum;
}
fretInfoGen( root, fret, fretOffset )
{
/*
Generate an object about the given fret.
root is the string's fretOffset fret note. Usually fret 0 (open).
fret is the fret number relative to a zero offset string note is the text of the note
*/
var fretInfo = { root : root,
fret : fret,
note : this.calcNote( root, fret - fretOffset ) };
var interval = this.calcInterval( fretInfo.note, this.key );
var x = "Normal";
if( this.extChords.includes( this.spelling ) )
x = "Extended";
else if( this.spelling == 'Lydian' )
x = "Lydian";
fretInfo.interval = this.intervals[ x ][ interval ];
fretInfo.inSpelling = this.spellings[ this.spelling ].includes( this.intervals[ x ][ interval ] );
// convert note for display
var curKeyList = this.showWithSharps( this.key, this.spelling ) ? this.keyListSharps : this.keyListFlats;
fretInfo.note = curKeyList[ this.dispKeyList.indexOf( fretInfo.note ) ];
return fretInfo;
}
generateFretboard( )
{
/* Returns an object with everything we care about
strings are keyed by string number (1 - N) and contain a list of dictionaries for each fret
There are also some other 'global' kinda things.. numStrings, instrument, etc.
This could be removed. There is no reason to generate the fretboard in advance,
just generate frets on the fly while displaying.
{
1 : [ { fretInfo }, { }... ],
2 :
.
.
}
*/
var strings = this.instrumentMap[ this.instrument ].t;
var fretBoard = { numStrings : strings.length,
instrument : this.instrument,
spelling : this.spelling,
fretOffset : this.instrumentMap[ this.instrument ].f };
for( var string = 1;string < strings.length + 1;string++ )
{
var stringList = [];
var rootNote = strings[ string - 1 ];
var offset = this.instrumentMap[ this.instrument ][ 'f' ][ string - 1 ];
for( var fret = offset;fret < this.num_frets + 1;fret++ )
stringList.push( this.fretInfoGen( rootNote, fret, offset ) );
fretBoard[ string ] = stringList
}
return fretBoard
}
//////////////////////////////////////
//////////////////////////////////////
displayFretboard()
{
let fretboard = this.generateFretboard();
let numStrings = fretboard.numStrings;
const LEFT_BORDER = 30;
const STR_SPC = 25;
const FRET_SPACING = 35;
const FRET_NUM_VERT_OFFSET = 20;
const FRET1_TOP = FRET_NUM_VERT_OFFSET + 20;
const FRETBOARD_H = ( numStrings - 1 ) * STR_SPC;
const FRET1_BOTTOM = FRET1_TOP + FRETBOARD_H;
const FRET2_TOP = FRET1_TOP + FRETBOARD_H + 40;
const FRET2_BOTTOM = FRET2_TOP + FRETBOARD_H;
const STRING_LEFT = LEFT_BORDER + 10;
const STRING_RIGHT = STRING_LEFT + ( this.num_frets + 1 ) * FRET_SPACING;
const DOT_RADIUS = 10;
const PI = 3.14159;
this.canvas.width = ( this.num_frets + 3 ) * FRET_SPACING;
this.canvas.height = FRET2_TOP + numStrings * STR_SPC;
this.ctx.clearRect( 0, 0, this.canvas.width, this.canvas.height );
this.ctx.beginPath();
this.ctx.rect( 0, 0, this.canvas.width, this.canvas.height );
this.ctx.stroke();
var elem = document.getElementById( "instKeyLabel" );
elem.innerHTML = this.instrument + ": " + this.key + " " + this.spelling + ( this.isChord ? " Chord" : " Scale" );
// Draw fret numbers and frets
for( var fret = 0;fret < this.num_frets + 1;fret++ )
{
let xPos = LEFT_BORDER + FRET_SPACING + fret * FRET_SPACING;
this.ctx.font = "12px Arial";
this.ctx.fillText( fret, xPos - STR_SPC / 2, FRET_NUM_VERT_OFFSET );
var w = fret ? 1 : 4;
if( fret == 12 )
w = 2;
this.ctx.strokeStyle = 'black';
this.ctx.beginPath();
this.ctx.rect( xPos, FRET1_TOP, w, FRETBOARD_H );
this.ctx.rect( xPos, FRET2_TOP, w, FRETBOARD_H );
this.ctx.stroke();
}
const fList = [ 3, 5, 7, 9, 12, 15, 17, 24 ];
for( var fIndex = 0;fIndex <= fList.length;fIndex++ )
{
var fretInd = fList[ fIndex ];
var xPos = LEFT_BORDER + FRET_SPACING / 2 + fretInd * FRET_SPACING;
var yPos = 0;
this.ctx.fillStyle = 'black';
this.ctx.beginPath();
if( ( fretInd == 12 ) || ( fretInd == 24 ) )
{
let yPos1 = FRET1_TOP + FRETBOARD_H * 1.2 / 4; // Put 1/3 from top / bottom
let yPos2 = FRET1_TOP + FRETBOARD_H * 2.8 / 4;
this.ctx.ellipse( xPos - 1, yPos1 - 1, 5, 5, 0, 0, 2 * PI );
this.ctx.ellipse( xPos - 1, yPos2 - 1, 5, 5, 0, 0, 2 * PI );
yPos1 = FRET2_TOP + FRETBOARD_H * 1.2 / 4;
yPos2 = FRET2_TOP + FRETBOARD_H * 2.8 / 4;
this.ctx.ellipse( xPos - 1, yPos1 - 1, 5, 5, 0, 0, 2 * PI );
this.ctx.ellipse( xPos - 1, yPos2 - 1, 5, 5, 0, 0, 2 * PI );
}
else
{
let yPos = ( FRET1_TOP + FRET1_BOTTOM ) / 2; // put in the middle
this.ctx.ellipse( xPos, yPos, 5, 5, 0, 0, 2 * PI );
yPos = ( FRET2_TOP + FRET2_BOTTOM ) / 2; // put in the middle
this.ctx.ellipse( xPos, yPos, 5, 5, 0, 0, 2 * PI );
}
this.ctx.fill();
}
for( let s = 0;s < numStrings;s++ ) // Draw strings
{
// String pitch
this.ctx.font = "12px Arial";
this.ctx.fillText( fretboard[ s + 1 ][ 0 ][ 'root'], STRING_LEFT - 20, FRET1_TOP + s * STR_SPC + 5 );
this.ctx.fillText( fretboard[ s + 1 ][ 0 ][ 'root'], STRING_LEFT - 20, FRET2_TOP + s * STR_SPC + 5 );
this.ctx.strokeStyle = 'grey';
this.ctx.beginPath();
this.ctx.moveTo( STRING_LEFT, FRET1_TOP + s * STR_SPC );
this.ctx.lineTo( STRING_RIGHT, FRET1_TOP + s * STR_SPC );
this.ctx.moveTo( STRING_LEFT, FRET2_TOP + s * STR_SPC );
this.ctx.lineTo( STRING_RIGHT, FRET2_TOP + s * STR_SPC );
this.ctx.stroke();
}
for( var stringNum = 0;stringNum < numStrings;stringNum++ ) // Populate individual frets
{
let string = fretboard[ stringNum + 1 ];
for( var ix = 0;ix < string.length;ix++ )
{
var fretInfo = string[ ix ];
if( this.extIntervals.includes( fretInfo.interval ) && ( stringNum > ( numStrings / 2 ) ) )
continue; // Don't display extended intervals on bass strings
xPos = LEFT_BORDER + FRET_SPACING / 2 + fretInfo.fret * FRET_SPACING;
yPos = FRET1_TOP + stringNum * STR_SPC;
if( fretInfo[ 'inSpelling' ] )
{
this.ctx.fillStyle = "#ff9090";
this.ctx.beginPath();
this.ctx.ellipse( xPos, yPos, DOT_RADIUS, DOT_RADIUS, 0, 0, 2 * PI );
this.ctx.arc( xPos, yPos, DOT_RADIUS, 0, 2 * Math.PI) ;
this.ctx.fill();
this.ctx.stroke();
this.ctx.fillStyle = "black";
this.ctx.fillText( fretInfo.note, xPos - ( fretInfo.note.length == 1 ? 4 : 8 ), yPos + 4 );
}
// Bottom fretboard is just Chord 1's intervals.
if( fretInfo.inSpelling )
{
yPos = FRET2_TOP + stringNum * STR_SPC;
this.ctx.beginPath();
this.ctx.fillStyle = "#e0e0ff";
this.ctx.beginPath();
this.ctx.ellipse( xPos, yPos, DOT_RADIUS, DOT_RADIUS, 0, 0, 2 * PI );
this.ctx.arc( xPos, yPos, DOT_RADIUS, 0, 2 * Math.PI) ;
this.ctx.fill();
this.ctx.stroke();
this.ctx.fillStyle = "black";
this.ctx.fillText( fretInfo.interval, xPos - ( fretInfo.interval.length == 1 ? 4 : 8 ), yPos + 4 );
}
}
}
}
}
var chordsObj = undefined;
function chordsInit()
{
chordsObj = new Chords();
}
function togShow( list_id )
{
// Close any other open dropdowns.
var dropdowns = document.getElementsByClassName( "dropdown-content" );
for( var i = 0;i < dropdowns.length;i++ )
if( dropdowns[ i ].classList.contains( 'show' ) )
dropdowns[ i ].classList.remove( 'show' );
document.getElementById( list_id ).classList.toggle( "show" );
}
function settingChange( param, value )
{
switch( param )
{
case 'Inst': chordsObj.instrument = value; break;
case 'Key': chordsObj.key = value; break;
case 'Chord':
chordsObj.spelling = value;
chordsObj.isChord = true;
chordsObj.updateModeMenu( 'Default' );
break;
case 'Scale':
chordsObj.spelling = value;
chordsObj.isChord = false;
if( ( value == 'Major' ) || ( value == 'Harmonic' ) || ( value == 'Melodic' ) )
chordsObj.updateModeMenu( value );
else
chordsObj.updateModeMenu( 'Default' );
break;
case 'Mode':
chordsObj.isChord = false;
chordsObj.spelling = value;
break;
}
chordsObj.displayFretboard();
}
// Close the dropdown menu if the user clicks outside of it
window.onclick = function( event )
{
if( !event.target.matches( '.dropbtn' ) )
{
var dropdowns = document.getElementsByClassName( "dropdown-content" );
for( var i = 0;i < dropdowns.length;i++ )
if( dropdowns[ i ].classList.contains( 'show' ) )
dropdowns[ i ].classList.remove( 'show' );
}
}
</script>
</body>
</html>