drawLine.mjsdrawLine.mjs - <short description TODO> Copyright (C) 2022 Strudel contributors - see https://codeberg.org/uzu/strudel/src/branch/main/packages/core/drawLine.mjs This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/.
7import Fraction, { gcd } from './fraction.mjs';
Intended for a debugging, drawLine renders the pattern as a string, where each character represents the same time span. Should only be used with single characters as values, otherwise the character slots will be messed up. Character legend:
- "|" cycle separator
- "-" hold previous value
- "." silence
@tags visualization @param {Pattern} pattern the pattern to use @param {number} chars max number of characters (approximately) @returns string @example const line = drawLine("0 [1 2 3]", 10); // |0--123|0--123 console.log(line); silence;
27function drawLine(pat, chars = 60) { 28 let cycle = 0; 29 let pos = Fraction(0); 30 let lines = ['']; 31 let emptyLine = ''; // this will be the "reference" empty line, which will be copied into extra lines 32 while (lines[0].length < chars) { 33 const haps = pat.queryArc(cycle, cycle + 1); 34 const durations = haps.filter((hap) => hap.hasOnset()).map((hap) => hap.duration); 35 const charFraction = gcd(...durations); 36 const totalSlots = charFraction.inverse(); // number of character slots for the current cycle 37 lines = lines.map((line) => line + '|'); // add pipe character before each cycle 38 emptyLine += '|'; 39 for (let i = 0; i < totalSlots; i++) { 40 const [begin, end] = [pos, pos.add(charFraction)]; 41 const matches = haps.filter((hap) => hap.whole.begin.lte(begin) && hap.whole.end.gte(end)); 42 const missingLines = matches.length - lines.length; 43 if (missingLines > 0) { 44 lines = lines.concat(Array(missingLines).fill(emptyLine)); 45 } 46 lines = lines.map((line, i) => { 47 const hap = matches[i]; 48 if (hap) { 49 const isOnset = hap.whole.begin.eq(begin); 50 const char = isOnset ? '' + hap.value : '-'; 51 return line + char; 52 } 53 return line + '.'; 54 }); 55 emptyLine += '.'; 56 pos = pos.add(charFraction); 57 } 58 cycle++; 59 } 60 return lines.join('\n'); 61}
63export default drawLine;