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add queryArc + update readme

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This commit is contained in:
Felix Roos 2022-04-13 00:25:53 +02:00
parent 87605ca25e
commit 2060e86875
2 changed files with 15 additions and 9 deletions
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8
packages/core/README.md
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@ -15,14 +15,14 @@ import { sequence, State, TimeSpan } from '@strudel.cycles/core';
const pattern = sequence('a', ['b', 'c']); const pattern = sequence('a', ['b', 'c']);
const events = pattern.query(new State(new TimeSpan(0, 2))); const events = pattern.queryArc(0, 1);
const spans = events.map( const spans = events.map(
(event) => `${event.value}: ${event.whole.begin.toFraction()} - ${event.whole.end.toFraction()} `, (event) => `${event.value}: ${event.whole.begin.toFraction()} - ${event.whole.end.toFraction()} `,
); );
``` ```
spans: yields:
```log ```log
a: 0 - 1/2 a: 0 - 1/2
@ -33,4 +33,6 @@ b: 3/2 - 7/4
c: 7/4 - 2 c: 7/4 - 2
``` ```
[play with @strudel.cycles/core on codesandbox](https://codesandbox.io/s/strudel-core-test-qmz6qr?file=/src/index.js). - [play with @strudel.cycles/core on codesandbox](https://codesandbox.io/s/strudel-core-test-qmz6qr?file=/src/index.js).
- [open color pattern example](https://raw.githack.com/tidalcycles/strudel/package-examples/packages/core/examples/canvas.html)
- [open minimal repl example](https://raw.githack.com/tidalcycles/strudel/package-examples/packages/core/examples/metro.html)

16
packages/core/strudel.mjs
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@ -236,6 +236,10 @@ class Pattern {
this.query = query; this.query = query;
} }
queryArc(begin, end) {
return this.query(new State(new TimeSpan(begin, end)));
}
_splitQueries() { _splitQueries() {
// Splits queries at cycle boundaries. This makes some calculations // Splits queries at cycle boundaries. This makes some calculations
// easier to express, as all events are then constrained to happen within // easier to express, as all events are then constrained to happen within
@ -686,12 +690,12 @@ class Pattern {
} }
_chop(n) { _chop(n) {
const slices = Array.from({length: n}, (x, i) => i); const slices = Array.from({ length: n }, (x, i) => i);
const slice_objects = slices.map(i => ({begin: i/n, end: (i+1)/n})); const slice_objects = slices.map((i) => ({ begin: i / n, end: (i + 1) / n }));
const func = function(o) { const func = function (o) {
return(sequence(slice_objects.map(slice_o => Object.assign({}, o, slice_o)))) return sequence(slice_objects.map((slice_o) => Object.assign({}, o, slice_o)));
} };
return(this._squeezeBind(func)); return this._squeezeBind(func);
} }
// cpm = cycles per minute // cpm = cycles per minute