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feat: added Tune scales to Xen, improved documentation re uzu/strudel#1944

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tyow 2026-01-23 18:08:34 -05:00
parent 93cf9fcb6a
commit 2b3f719484
4 changed files with 37 additions and 14 deletions
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18
packages/xen/tunejs.js
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@ -78,14 +78,21 @@ Tune.prototype.frequency = function(stepIn, octaveIn) {
}
// which scale degree (0 - scale length) is our input
// 60 % 12 = 0
var scaleDegree = stepIn % this.scale.length
// what's this doing
// 0 scaleDegree = 12
// seems to simply be for a negative result from above, maybe another way to do it, but ok for now
while (scaleDegree < 0) {
scaleDegree += this.scale.length
}
// tonic is currently always 1
// so this is 1*scale[scaledegree]
var freq = this.tonic*this.scale[scaleDegree]
// map it to octave
freq = freq*(Math.pow(2,octave))
// truncate irrational numbers
@ -137,10 +144,13 @@ Tune.prototype.MIDI = function(stepIn,octaveIn) {
}
/* Load a new scale */
// sets .scale to ratios
Tune.prototype.loadScale = function(scale){
/* load the scale */
let name
if (typeof scale === 'string') name = scale;
var freqs = isArrayOfNumbers(scale) ? scale : TuningList[scale].frequencies
this.scale = []
for (var i=0;i<freqs.length-1;i++) {
@ -148,10 +158,10 @@ Tune.prototype.loadScale = function(scale){
}
/* visualize in console */
/* console.log(" ");
console.log("LOADED "+name);
console.log(TuningList[name].description);
console.log(this.scale); */
// console.log(" ");
// console.log("LOADED "+name);
// console.log(TuningList[name].description);
// console.log(this.scale);
var vis = [];
for (var i=0;i<100;i++) {
vis[i] = " ";