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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