@stringsync/vexml/dist/esm/rendering/bend.js

MusicXML to Vexflow

import * as vexflow from 'vexflow';
import { Rect } from '../spatial';
import { Fraction } from '../util';
const BEND_WIDTH = 32;
export class Bend {
    config;
    log;
    document;
    key;
    constructor(config, log, document, key) {
        this.config = config;
        this.log = log;
        this.document = document;
        this.key = key;
    }
    render() {
        const voiceEntry = this.document.getVoiceEntry(this.key);
        const phrases = new Array();
        if (voiceEntry.type === 'note' || voiceEntry.type === 'chord') {
            phrases.push(...voiceEntry.bends.map((bend) => this.toVexflowBendPhrase(bend)));
        }
        const vexflowModifiers = new Array();
        if (phrases.length > 0) {
            vexflowModifiers.push(new vexflow.Bend(phrases));
        }
        return {
            type: 'bend',
            key: this.key,
            rect: Rect.empty(),
            vexflowModifiers,
        };
    }
    toVexflowBendPhrase(bend) {
        const bendType = bend.bendType;
        const semitones = bend.semitones;
        let text = '';
        if (semitones === 2) {
            text = 'full';
        }
        else if (semitones === 1) {
            text = '1/2';
        }
        else if (semitones === 0.5) {
            text = '1/4';
        }
        else {
            const { whole, remainder } = Fraction.fromDecimal(semitones).toMixed();
            if (whole > 0 && remainder.numerator > 0) {
                text = `${whole} ${remainder.numerator}/${remainder.denominator}`;
            }
            else if (whole > 0) {
                text = `${whole}`;
            }
            else if (remainder.numerator > 0) {
                text = `${remainder.numerator}/${remainder.denominator}`;
            }
        }
        let type;
        switch (bendType) {
            case 'prebend':
                // TODO: Support pre-bends when they are supported by VexFlow.
                type = vexflow.Bend.UP;
                break;
            case 'release':
                type = vexflow.Bend.DOWN;
                break;
            default:
                type = vexflow.Bend.UP;
                break;
        }
        return { text, type, width: BEND_WIDTH, drawWidth: BEND_WIDTH };
    }
}