A function to convert numbers into sound.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication | |
// http://creativecommons.org/publicdomain/zero/1.0/ | |
// Pass in an array of numbers ranging from 0 to 20. | |
function playSparkline(notes) { | |
if (!window.AudioContext && !window.webkitAudioContext) { | |
return; | |
} | |
var playing = null; | |
var note = 0; | |
var output = new (window.AudioContext || window.webkitAudioContext)(); | |
var instrument = output.createOscillator(); | |
var amplifier = output.createGain(); | |
var playNotes = function() { | |
if (note < notes.length) { | |
instrument.frequency.value = 440 + (notes[note] * 64); // hertz | |
note = note + 1; | |
} else { | |
amplifier.gain.value = 0; | |
} | |
playing = window.setTimeout(playNotes, 25); | |
}; | |
instrument.type = 'sine'; // 'sine', 'square', 'sawtooth', 'triangle' | |
instrument.start(); | |
instrument.connect(amplifier); | |
amplifier.gain.value = 0.7; | |
amplifier.connect(output.destination); | |
playNotes(); | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment