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我正在创建一个带有多个键的五线谱注释：

const staveNote: vexflow.Flow.StaveNote = new this.VF.StaveNote({
  keys: this.renderNotesSortedByPitch(placedChord.notes),
  duration: chordDuration,
  auto_stem: true,
  clef: Clef.TREBLE
});

private renderNotesSortedByPitch(notes: Array<Note>): Array<string> {
  const vexflowNotes: Array<string> = new Array<string>();
  notes
  // this.sortNotesByPitch(notes)
  .forEach((note: Note) => {
    vexflowNotes.push(this.renderNote(note));
  });
  return vexflowNotes;
}

private sortNotesByPitch(notes: Array<Note>): Array<Note> {
  return notes.sort((noteA: Note, noteB: Note) => {
    return noteA.pitch.chroma.value - noteB.pitch.chroma.value   <--- No arithmetic operation on strings
  });
}

我在浏览器控制台中收到以下警告：

Warning:  Unsorted keys in note will be sorted. See https://github.com/0xfe/vexflow/issues/104 for details. Error
    at Function.b.StackTrace (http://localhost:4200/vendor.js:93990:4976)
    at Function.b.W (http://localhost:4200/vendor.js:93990:5134)
    at http://localhost:4200/vendor.js:93990:255605
    at Array.forEach (<anonymous>)
    at e.value (http://localhost:4200/vendor.js:93990:255572)
    at new e (http://localhost:4200/vendor.js:93990:250357)
    at SheetService.vexflowRenderSoundtrack (http://localhost:4200/main.js:2083:51)
    at SheetService.createSoundtrackSheet (http://localhost:4200/main.js:2004:14)
    at SheetComponent.createSheet (http://localhost:4200/main.js:2465:35)
    at SheetComponent.ngAfterViewInit (http://localhost:4200/main.js:2452:14)

我知道我需要提供已经按照 Vexflow 对它们进行排序的方式排序的键。

那里也描述了一个类似的问题。

如何对note.pitch.chroma.value作为字符串的键进行排序？

最好有一些与以下相同的方法：

staveNote.setKeyStyle(0, { fillStyle: 'red' });

说，一些这样的方法：

staveNote.setDotted(0);

或者：

staveNote.setKeyStyle(0, { fillStyle: 'red', dotted: true });

更新：根据建议，我可以在将音符添加为五线谱中的键之前创建对音符进行排序的方法：

  private getNoteFrequency(note: Note): number {
    return Tone.Frequency(note.renderAbc()).toFrequency();
  }

  private sortNotesByPitch(notes: Array<Note>): Array<Note> {
    return notes.sort((noteA: Note, noteB: Note) => {
      return this.getNoteFrequency(noteA) - this.getNoteFrequency(noteB);
    });
  }

Vexflow警告消息不再显示在浏览器控制台中。

4

1 回答 1

1

Vexflow expects your notes to be sorted vertically, no way around that. You need to write your own function to compare two notes given as strings.

here's a working note-string-comparison-function which doesn't take accidentals into account: repl.it/repls/WobblyFavorableYottabyte

edited for clarity, thanks @gristow for the correction!

于 2020-03-24T21:05:22.703 回答