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noteTester.js
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noteTester.js
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/*global $, jQuery, alert*/
var noteTester = {
useSharps: true,
currentNotes: [],
allowEverything: false, // If false, a note and its sharped or flatted version cannot be pressed at the same time
// Note: if allowEverything is set to true, the score may not show all the pressed notes.
addListeners: function () {
'use strict';
this.removeListeners();
$('#noteTesterPiano .note').click(function () {
noteTester.pushKey($(this));
});
},
removeListeners: function () {
'use strict';
$('#noteTesterPiano .note').off();
},
pushKey: function (keyObject) {
'use strict';
var note,
extraClass = '',
noteNat;
if (keyObject.length === 0) {
console.log('Non existing note pressed');
return;
}
note = keyObject.data('note');
if (!this.useSharps) {
note = this.sharpToFlat(note);
}
if (!this.allowEverything) {
// The complementary note cannot be pressed at the same time
this.pullNote(this.findComplementary(note));
}
noteNat = note.substr(0, 2);
if (note.indexOf('b') > -1) {
extraClass = '.flat';
} else if (note.indexOf('#') > -1) {
extraClass = '.sharp';
}
this.showNote(note);
// The note object is selected/unselected
if (keyObject.hasClass('selected')) {
keyObject.removeClass('selected');
this.removeNote(note);
$('#noteTesterScore .note.' + noteNat + extraClass).hide();
} else {
keyObject.addClass('selected');
this.addNote(note);
$('#noteTesterScore .note.' + noteNat).addClass(extraClass.slice(1));
$('#noteTesterScore .note.' + noteNat).show();
}
},
pullNote: function (note) {
'use strict';
var cssClass,
noteNat = note.substr(0, 2),
noteSharp = this.flatToSharp(note).replace('#', 'Sharp');
if (note.indexOf('b') > -1) {
cssClass = 'flat';
} else if (note.indexOf('#') > -1) {
cssClass = 'sharp';
}
// Only if the note is really pressed, it will be removed.
if($.inArray(note, this.currentNotes)>-1){
this.removeNote(note);
// On the piano only sharp notes are represented (thus the conversion to sharp)
$('#noteTesterPiano .note.' + noteSharp).removeClass('selected');
$('#noteTesterScore .note.' + noteNat).removeClass(cssClass);
}
},
// A complementary note should not be pressed at the same time (e.g.: C# and C, etc.)
findComplementary: function (note) {
'use strict';
if (note === undefined) {
console.log('Non existing note pressed');
return;
}
if (note.indexOf('b') > -1) {
return note.replace('b', '');
}
if (note.indexOf('#') > -1) {
return note.replace('#', '');
}
if (this.useSharps) {
return note + '#';
}
return note + 'b';
},
sharpToFlat: function (note) {
'use strict';
switch (note) {
case 'C4#':
return 'D4b';
case 'D4#':
return 'E4b';
case 'F4#':
return 'G4b';
case 'G4#':
return 'A4b';
case 'A4#':
return 'B4b';
case 'C5#':
return 'D5b';
case 'D5#':
return 'E5b';
case 'F5#':
return 'G5b';
case 'G5#':
return 'A5b';
case 'A5#':
return 'B5b';
}
// If it is not sharp, the same note is returned.
return note;
},
flatToSharp: function (note) {
'use strict';
switch (note) {
case 'D4b':
return 'C4#';
case 'E4b':
return 'D4#';
case 'G4b':
return 'F4#';
case 'A4b':
return 'G4#';
case 'B4b':
return 'A4#';
case 'D5b':
return 'C5#';
case 'E5b':
return 'D5#';
case 'G5b':
return 'F5#';
case 'A5b':
return 'G5#';
case 'B5b':
return 'A5#';
case 'C4b':
return 'B4';
case 'C5b':
return 'B5';
case 'F4b':
return 'E4';
case 'F5b':
return 'E5';
}
// If it is not sharp, the same note is returned.
return note;
},
addNote: function (note) {
'use strict';
this.currentNotes.push(note);
},
removeNote: function (note) {
'use strict';
var index = this.currentNotes.indexOf(note);
if (index > -1) {
this.currentNotes.splice(index, 1);
}
},
// It shows a note on the display panel
showNote: function (note) {
'use strict';
$('#noteTesterFeedback').empty();
$('#noteTesterFeedback').append('<div class="feedbackNote" style="display:none">' + note + '</div>');
$('.feedbackNote').fadeIn(500);
setTimeout(function () {
$('.feedbackNote').fadeOut(300);
}, 800);
},
// Used to simulate pressing a key on the keyboard for a specific note.
pushNote: function (note) {
'use strict';
var cssClass = (this.flatToSharp(note)).replace('#', 'Sharp');
this.pushKey($('#noteTesterPiano .note.' + cssClass));
},
// Used to simulate pressing a key on the keyboard for an array of notes.
pushNotes: function (notes) {
'use strict';
var octNotes = this.notesIntoOctaves(notes),
numNotes = notes.length,
i;
for (i = 0; i < numNotes; i += 1) {
this.pushNote(octNotes[i]);
}
},
resetNotes: function () {
'use strict';
this.currentNotes = [];
$('.note.selected').each(function () {
$(this).removeClass('selected');
});
$('#noteTesterScore .note').hide();
$('#noteTesterScore .note').removeClass('flat');
$('#noteTesterScore .note').removeClass('sharp');
},
// It returns the current notes without information about the octaves.
getNotesNoOctaves: function () {
'use strict';
var notes = [],
i;
for (i = 0; i < this.currentNotes.length; i += 1) {
notes[i] = this.currentNotes[i].replace(/\d+/g, '');
}
return notes;
},
// It tells if the note1 is smaller than the note2 (C is smaller than D, etc.)
smallerNote: function (note1, note2) {
'use strict';
var notes = 'CDEFGAB'; // Notes order
note1 = note1.substr(0, 1),
note2 = note2.substr(0, 1);
return notes.indexOf(note1) < notes.indexOf(note2);
},
// It translates non existing notes such as Cb and G## into existing notes on the keyboard.
normalizeNote: function (note) {
'use strict';
var note = note.trim();
switch (note) {
case 'B#':
return 'C';
case 'E#':
return 'F';
case 'Cb':
return 'B';
case 'Fb':
return 'E';
case 'C##':
return 'D';
case 'D##':
return 'E';
case 'E##':
return 'F#';
case 'F##':
return 'G';
case 'G##':
return 'A';
case 'A##':
return 'B';
case 'B##':
return 'C#';
case 'Cbb':
return 'Bb';
case 'Dbb':
return 'C';
case 'Ebb':
return 'D';
case 'Fbb':
return 'Eb';
case 'Gbb':
return 'F';
case 'Abb':
return 'G';
case 'Bbb':
return 'A';
default:
return note;
}
},
// It normalizes an array of notes (it translates non existing notes into currently available notes on the keyboard, such as Cb and E##)
normalizeNotes: function (notes) {
'use strict';
var numNotes = notes.length,
i;
for (i = 0; i < numNotes; i += 1) {
notes[i] = this.normalizeNote(notes[i]);
}
return notes;
},
// It returns the given array of notes with information added about octaves
notesIntoOctaves: function (notes) {
'use strict';
var octave = 4,
previousNote,
notesOct = [],
numNotes = notes.length,
i;
notes = this.normalizeNotes(notes);
previousNote = notes[0];
notesOct[0] = previousNote.substr(0, 1) + octave.toString() + previousNote.substr(1);
if (numNotes === 1) {
return notesOct;
}
for (i = 1; i < numNotes; i += 1) {
if (this.smallerNote(notes[i], previousNote)) {
octave += 1;
}
previousNote = notes[i];
notesOct[i] = previousNote.substr(0, 1) + octave.toString() + previousNote.substr(1);
}
return notesOct;
}
};