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fix drawLine polyrhythm

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This commit is contained in:
Felix Roos 2022-04-24 01:40:26 +02:00
parent 58a936cf33
commit 283e5fde69
2 changed files with 9 additions and 7 deletions
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10
packages/core/drawLine.mjs
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@ -5,17 +5,15 @@ function drawLine(pat, chars = 60) {
let pos = Fraction(0);
let lines = [''];
let emptyLine = ''; // this will be the "reference" empty line, which will be copied into extra lines
const slots = [];
while (lines[0].length < chars) {
const haps = pat.queryArc(cycle, cycle + 1);
const durations = haps.filter((hap) => hap.hasOnset()).map((hap) => hap.duration);
const totalSlots = gcd(...durations).inverse(); // number of character slots for the current cycle
slots.push(totalSlots); // remember slots for possible empty lines needed in a later cycle
const minDuration = durations.reduce((a, b) => a.min(b), durations[0]); // min duration = step length
const charFraction = gcd(...durations);
const totalSlots = charFraction.inverse(); // number of character slots for the current cycle
lines = lines.map((line) => line + '|'); // add pipe character before each cycle
emptyLine += '|';
for (let i = 0; i < totalSlots; i++) {
const [begin, end] = [pos, pos.add(minDuration)];
const [begin, end] = [pos, pos.add(charFraction)];
const matches = haps.filter((hap) => hap.whole.begin.lte(begin) && hap.whole.end.gte(end));
const missingLines = matches.length - lines.length;
if (missingLines > 0) {
@ -31,7 +29,7 @@ function drawLine(pat, chars = 60) {
return line + '.';
});
emptyLine += '.';
pos = pos.add(minDuration);
pos = pos.add(charFraction);
}
cycle++;
}

6
packages/core/test/drawLine.test.mjs
View File

@ -1,4 +1,4 @@
import { fastcat, stack, slowcat, silence } from '../pattern.mjs';
import { fastcat, stack, slowcat, silence, pure } from '../pattern.mjs';
import { strict as assert } from 'assert';
import drawLine from '../drawLine.mjs';
@ -16,6 +16,10 @@ describe('drawLine', () => {
it('supports unequal silence', () => {
assert.equal(drawLine(fastcat(0, silence, [1, 2]), 10), '|0-..12|0-..12');
});
it('supports polyrhythms', () => {
'0*2 1*3';
assert.equal(drawLine(fastcat(pure(0).fast(2), pure(1).fast(3)), 10), '|0--0--1-1-1-');
});
it('supports multiple lines', () => {
assert.equal(
drawLine(fastcat(0, stack(1, 2)), 10),