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Tweaks and a couple of tests for signals

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This commit is contained in:
alex 2022-02-20 23:59:16 +00:00
parent b4b303a2d9
commit fd8f70d914
2 changed files with 30 additions and 5 deletions
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11
strudel.mjs
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@ -676,23 +676,26 @@ export const signal = func => {
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 = signal(t => (Math.sin(Math.PI * 2 * t) + 1) / 2)
export const sine = _fromBipolar(sine2)
export const cosine2 = sine2._early(0.25)
export const cosine = sine._early(0.25)
export const saw2 = signal(t => (t % 1) * 2)
export const saw = signal(t => t % 1)
export const saw2 = _toBipolar(saw)
export const isaw2 = signal(t => (1 - (t % 1)) * 2)
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 square2 = signal(t => (Math.floor((t*2) % 2) * 2) - 1)
export const square = signal(t => Math.floor((t*2) % 2))
export const square2 = _toBipolar(square)
function reify(thing) {
// Tunrs something into a pattern, unless it's already a pattern

24
test/pattern.test.mjs
View File

@ -2,7 +2,7 @@ import Fraction from 'fraction.js'
import { strict as assert } from 'assert';
import {TimeSpan, Hap, Pattern, pure, stack, fastcat, slowcat, cat, sequence, polyrhythm, silence, fast, timeCat,add,sub,mul,div} from "../strudel.mjs";
import {TimeSpan, Hap, Pattern, pure, stack, fastcat, slowcat, cat, sequence, polyrhythm, silence, fast, timeCat,add,sub,mul,div,saw,saw2,isaw,isaw2,sine,sine2,square,square2,tri,tri2} from "../strudel.mjs";
//import { Time } from 'tone';
import pkg from 'tone';
const { Time } = pkg;
@ -307,4 +307,26 @@ describe('Pattern', function() {
)
})
})
describe('signal()', function() {
it('Can make saw/saw2', function() {
assert.deepStrictEqual(
saw.struct(true,true,true,true).firstCycle,
sequence(1/8,3/8,5/8,7/8).firstCycle
)
assert.deepStrictEqual(
saw2.struct(true,true,true,true).firstCycle,
sequence(-3/4,-1/4,1/4,3/4).firstCycle
)
})
it('Can make isaw/isaw2', function() {
assert.deepStrictEqual(
isaw.struct(true,true,true,true).firstCycle,
sequence(7/8,5/8,3/8,1/8).firstCycle
)
assert.deepStrictEqual(
isaw2.struct(true,true,true,true).firstCycle,
sequence(3/4,1/4,-1/4,-3/4).firstCycle
)
})
})
})