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Add continuous signals (sine, cosine, saw, etc)

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alex 2022-02-20 22:47:00 +00:00
parent 74040e52b4
commit b4b303a2d9
1 changed files with 24 additions and 1 deletions
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25
strudel.mjs
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@ -148,7 +148,7 @@ class TimeSpan {
return result
}
get midpoint() {
midpoint() {
return(this.begin.add((this.end.sub(this.begin)).div(Fraction(2))))
}
@ -671,6 +671,29 @@ function steady(value) {
return new Pattern(span => Hap(undefined, span, value))
}
export const signal = func => {
const query = span => [new Hap(undefined, span, func(span.midpoint()))]
return new Pattern(query)
}
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 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 isaw2 = signal(t => (1 - (t % 1)) * 2)
export const isaw = signal(t => 1 - (t % 1))
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))
function reify(thing) {
// Tunrs something into a pattern, unless it's already a pattern
if (thing?.constructor?.name == "Pattern") {