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make separate signal module

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This commit is contained in:
alex 2022-04-13 17:41:48 +01:00
parent f75da0e2e3
commit 050296d0c2
3 changed files with 39 additions and 33 deletions
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1
packages/core/index.mjs
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@ -4,6 +4,7 @@ import Fraction from './fraction.mjs';
export {Fraction};
export * from './hap.mjs';
export * from './pattern.mjs';
export * from './signal.mjs';
export * from './state.mjs';
export * from './timespan.mjs';
export * from './util.mjs';

41
packages/core/pattern.mjs
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@ -299,6 +299,13 @@ export class Pattern {
return this._asNumber().fmap((v) => Math.ceil(v));
}
_toBipolar() {
return this.fmap((x) => x * 2 - 1);
}
_fromBipolar() {
return this.fmap((x) => (x + 1) / 2);
}
// Assumes source pattern of numbers in range 0..1
range(min, max) {
return this.mul(max - min).add(min);
@ -306,7 +313,7 @@ export class Pattern {
// Assumes source pattern of numbers in range -1..1
range2(min, max) {
return _fromBipolar(this).range(min, max);
return this._fromBipolar().range(min, max);
}
union(other) {
@ -737,37 +744,6 @@ export function pure(value) {
return new Pattern(query);
}
export function steady(value) {
// A continuous value
return new Pattern((span) => Hap(undefined, span, value));
}
export const signal = (func) => {
const query = (state) => [new Hap(undefined, state.span, func(state.span.midpoint()))];
return new Pattern(query);
};
const _toBipolar = (pat) => pat.fmap((x) => x * 2 - 1);
const _fromBipolar = (pat) => pat.fmap((x) => (x + 1) / 2);
export const sine2 = signal((t) => Math.sin(Math.PI * 2 * t));
export const sine = _fromBipolar(sine2);
export const cosine2 = sine2._early(Fraction(1).div(4));
export const cosine = sine._early(Fraction(1).div(4));
export const saw = signal((t) => t % 1);
export const saw2 = _toBipolar(saw);
export const isaw = signal((t) => 1 - (t % 1));
export const isaw2 = _toBipolar(isaw);
export const tri2 = fastcat(isaw2, saw2);
export const tri = fastcat(isaw, saw);
export const square = signal((t) => Math.floor((t * 2) % 2));
export const square2 = _toBipolar(square);
export function isPattern(thing) {
// thing?.constructor?.name !== 'Pattern' // <- this will fail when code is mangled
return thing instanceof Pattern;
@ -1054,4 +1030,3 @@ Pattern.prototype.define = (name, func, options = {}) => {
// Pattern.prototype.define('early', (a, pat) => pat.early(a), { patternified: true, composable: true });
Pattern.prototype.define('hush', (pat) => pat.hush(), { patternified: false, composable: true });
Pattern.prototype.define('bypass', (pat) => pat.bypass(on), { patternified: true, composable: true });

30
packages/core/signal.mjs Normal file
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@ -0,0 +1,30 @@
import { Hap } from './hap.mjs';
import { Pattern, fastcat } from './pattern.mjs';
import Fraction from './fraction.mjs';
export function steady(value) {
// A continuous value
return new Pattern((span) => Hap(undefined, span, value));
}
export const signal = (func) => {
const query = (state) => [new Hap(undefined, state.span, func(state.span.midpoint()))];
return new Pattern(query);
};
export const isaw = signal((t) => 1 - (t % 1));
export const isaw2 = isaw._toBipolar();
export const saw = signal((t) => t % 1);
export const saw2 = saw._toBipolar();
export const sine2 = signal((t) => Math.sin(Math.PI * 2 * t));
export const sine = sine2._fromBipolar();
export const cosine = sine._early(Fraction(1).div(4));
export const cosine2 = sine2._early(Fraction(1).div(4));
export const square = signal((t) => Math.floor((t * 2) % 2));
export const square2 = square._toBipolar();
export const tri = fastcat(isaw, saw);
export const tri2 = fastcat(isaw2, saw2);