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optimise euclidish, creating new morph function in the process

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alex 2025-08-17 22:13:26 +01:00
parent 482ebb695a
commit b717615558
4 changed files with 143 additions and 46 deletions
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22
packages/core/euclid.mjs
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@ -10,7 +10,7 @@ https://rohandrape.net/?t=hmt
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import { timeCat, register, silence, stack, pure } from './pattern.mjs';
import { timeCat, register, silence, stack, pure, _morph } from './pattern.mjs';
import { rotate, flatten, splitAt, zipWith } from './util.mjs';
import Fraction, { lcm } from './fraction.mjs';
@ -212,22 +212,10 @@ export const euclidLegatoRot = register(['euclidLegatoRot'], function (pulses, s
* @param {number} steps the number of steps to fill
* @param {number} groove exists between the extremes of 0 (straight euclidian) and 1 (straight pulse)
* @example
* sound("hh").euclidish(7,12,tri.slow(8))
* .pan(tri.slow(8))
* sound("hh").euclidish(7,12,sine.slow(8))
* .pan(sine.slow(8))
*/
export const { euclidish, eish } = register(['euclidish', 'eish'], function (pulses, steps, perc, pat) {
const b = bjork(pulses, steps);
let trues = 0;
const offs = [];
for (const [pos, step] of b.entries()) {
if (step) {
offs.push([trues++, pos]);
}
}
const tweened = offs.map(([n, pos]) =>
Fraction(pos)
.div(steps)
.add(Fraction(n).div(pulses).sub(Fraction(pos).div(steps)).mul(perc)),
);
return pat.struct(stack(...tweened.map((pos) => pure(true)._fastGap(steps)._late(pos)))).setSteps(steps);
const morphed = _morph(bjork(pulses, steps), new Array(pulses).fill(1), perc);
return pat.struct(morphed).setSteps(steps);
});