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

MusicXML to Vexflow

import * as vexflow from 'vexflow';
import { Rect } from '../spatial';
const KEY_SIGNATURE_PADDING = 15;
/** Represents a musical key signature, not document key. */
export class Key {
    config;
    log;
    document;
    key;
    constructor(config, log, document, key) {
        this.config = config;
        this.log = log;
        this.document = document;
        this.key = key;
    }
    render() {
        const vexflowKeySignature = this.getVexflowKeySignature();
        return {
            type: 'key',
            key: this.key,
            rect: Rect.empty(), // placeholder
            width: this.getWidth(),
            vexflowKeySignature,
        };
    }
    getAlterations() {
        const keySignature = this.document.getStave(this.key).signature.key;
        const alterations = new Array();
        if (Math.abs(keySignature.fifths) > 7) {
            const additional = Math.abs(keySignature.fifths) - 7;
            for (let index = 0; index < additional; index++) {
                alterations.push(keySignature.fifths > 0 ? '##' : 'bb');
            }
        }
        return alterations;
    }
    getWidth() {
        const vexflowKeySignature = this.getVexflowKeySignature();
        return vexflowKeySignature.getWidth() + KEY_SIGNATURE_PADDING;
    }
    getVexflowKeySignature() {
        const keySignature = this.document.getStave(this.key).signature.key;
        return new vexflow.KeySignature(keySignature.rootNote, keySignature.previousKey?.rootNote, this.getAlterations());
    }
}