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add .tuning + 12ji preset

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This commit is contained in:
Felix Roos 2022-02-28 23:42:04 +01:00
parent 85f0886886
commit e78b3a88d7
1 changed files with 14 additions and 0 deletions
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14
repl/src/xen.mjs
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@ -9,11 +9,18 @@ function edo(name) {
return Array.from({ length: divisions }, (_, i) => Math.pow(2, i / divisions));
}
const presets = {
'12ji': [1 / 1, 16 / 15, 9 / 8, 6 / 5, 5 / 4, 4 / 3, 45 / 32, 3 / 2, 8 / 5, 5 / 3, 16 / 9, 15 / 8],
};
function getXenScale(scale, indices) {
if (typeof scale === 'string') {
if (/^[1-9]+edo$/.test(scale)) {
return edo(scale);
}
if (presets[scale]) {
return presets[scale];
}
throw new Error('unknown scale name: "' + scale + '"');
}
if (!indices) {
@ -34,4 +41,11 @@ Pattern.prototype._xen = function (scaleNameOrRatios) {
return event.withValue(() => frequency).setContext({ ...event.context, type: 'frequency' });
});
};
Pattern.prototype.tuning = function (steps) {
return this._asNumber()._withEvent((event) => {
const frequency = xenOffset(steps, event.value);
return event.withValue(() => frequency).setContext({ ...event.context, type: 'frequency' });
});
};
Pattern.prototype.define('xen', (scale, pat) => pat.xen(scale), { composable: true, patternified: true });
// Pattern.prototype.define('tuning', (scale, pat) => pat.xen(scale), { composable: true, patternified: false });