Created
December 4, 2014 17:07
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Thema Regium
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<!DOCTYPE html> | |
<html> | |
<head> | |
<link href='http://fonts.googleapis.com/css?family=Ubuntu+Mono' rel='stylesheet' type='text/css'> | |
<style> | |
body { | |
padding: 9rem; | |
font-size: 4rem; | |
font-family: 'Ubuntu Mono', monospace; | |
line-height: 6rem; | |
text-align: center; | |
} | |
</style> | |
</head> | |
<body> | |
<script> | |
(function() { | |
var ac = new window.AudioContext(), | |
osc = ac.createOscillator(), | |
notes = { | |
'c': 261.6, | |
'c#': 277.2, | |
'db': 277.2, | |
'd': 293.7, | |
'd#': 311.1, | |
'eb': 311.1, | |
'e': 329.6, | |
'f': 349.2, | |
'f#': 370.0, | |
'gb': 370.0, | |
'g': 392.0, | |
'g#': 415.3, | |
'ab': 415.3, | |
'a': 440.0, | |
'a#': 466.2, | |
'bb': 466.2, | |
'b': 493.9, | |
'--': 1 | |
}, | |
toPrint = function(note) { | |
var out = note.charAt(0).toUpperCase(); | |
if(out === '-') return ''; | |
if(note.length > 1) { | |
if(note.charAt(1) === 'b') | |
out += '♭'; | |
else | |
out += '♯'; | |
} | |
return out; | |
}, | |
themaRegium; | |
// "Thema Regium" beat by Bach feat. Frederich II of Prussia | |
// note octave duration note octave duration ... | |
themaRegium = | |
'c 1 2 eb 1 2 g 1 2 ab 1 2 b 0.5 2 -- 1 1 g 1 1 ' + | |
'f# 1 2 f 1 2 e 1 2 eb 1 3 d 1 1 db 1 1 c 1 1 ' + | |
'b .5 1 a .5 .5 g .5 .5 c 1 1 f 1 1 eb 1 2 d 1 2 ' + | |
'c 1 4'; | |
themaRegium = themaRegium.split(/\s+/g); | |
var nextNote = function() { | |
if(themaRegium.length < 1) { | |
document.body.innerHTML += '!'; | |
return osc.stop(); | |
} | |
var note = themaRegium.shift(), | |
oct = parseFloat(themaRegium.shift()), | |
dur = parseFloat(themaRegium.shift()) * 250; | |
console.log(note, dur); | |
osc.frequency.value = notes[note] * oct; | |
setTimeout(nextNote, dur); | |
document.body.innerHTML += ' ' + toPrint(note); | |
} | |
osc.connect(ac.destination); | |
osc.type = 'triangle'; | |
osc.start(0); | |
nextNote(); | |
}()); | |
</script> | |
</body> | |
</html> |
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