如何在VexFlow中渲染配乐？

Question

使用Tone.js和我可以播放这首旋律：

const textMeasures = ['rest/4 B4/16 A4/16 G#4/16 A4/16',
'C5/8 rest/8 D5/16 C5/16 B4/16 C5/16',
'E5/8 rest/8 F5/16 E5/16 D#5/16 E5/16',
'B5/16 A5/16 G#5/16 A5/16 B5/16 A5/16 G#5/16 A5/16',
'C6/4 A5/8 C6/8',
'B5/8 A5/8 G5/8 A5/8',
'B5/8 A5/8 G5/8 A5/8',
'B5/8 A5/8 G5/8 F#5/8',
'E5/4'];

现在，我想使用VexFlow在一些staves上呈现这些音符。

请记住，在移动设备上显示应该是正常的，并且配乐上可能有多个声音。

现在，我创建了一个方法来为每个度量设置一个stave：

private renderSoundtrackVexflow(name: string, soundtrack: Soundtrack) {
  const context = this.renderVexflowContext(name, VEXFLOW_WIDTH, VEXFLOW_HEIGHT);
  context.setFont('Arial', 10, '').setBackgroundFillStyle('#eed'); // TODO Hard coded values

  if (soundtrack.hasTracks()) {
    let staveIndex: number = 0;
    const voices: Array<vexflow.Flow.Voice> = new Array<vexflow.Flow.Voice>();
    for (const track of soundtrack.tracks) {
      if (track.hasMeasures()) {
        for (const measure of track.measures) {
          if (measure.hasNotes()) {
            const stave = new this.VF.Stave(0, staveIndex * (VEXFLOW_STAVE_HEIGHT + VEXFLOW_STAVE_MARGIN), VEXFLOW_WIDTH);
            staveIndex++;
            stave.setContext(context);
            stave.addClef(VEXFLOW_CLEF);
            stave.addTimeSignature(this.renderTimeSignature(measure));
            stave.draw();

            const notes = new Array<vexflow.Flow.StaveNote>();
            const voice = new this.VF.Voice();
            voice.setStrict(false);
            voice.setContext(context);
            voice.setStave(stave);
            for (const placedNote of measure.placedNotes) {
              const note: Note = placedNote.note;
              notes.push(new this.VF.StaveNote({ keys: [ this.renderAbc(note) ], duration: this.renderDuration(note) }));
            }
            voice.addTickables(notes);
            voices.push(voice);
          }
        }
        const formatter = new this.VF.Formatter();
        formatter.joinVoices(voices).format(voices, VEXFLOW_WIDTH);
        for (const voice of voices) {
          voice.draw();
          console.log('Min voice width: ' + formatter.getMinTotalWidth(voice));
        }
      }
    }
  }
}

但音符显示在横杆上，但一些音符显示在横杆之间，在页面上。

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Answer 1

这个问题有点老了，但是如果你仍然需要一个解决方案的话...

问题是所有音符的词干都是向上的。要解决此问题，请将auto_stem: true和clef: "treble"添加到传递给VF.StaveNote()的选项列表中，有关详细信息，请参阅VexFlow: Stem Direction。以下是创建注释的更正行：

notes.push(new this.VF.StaveNote({
      keys: [ this.renderAbc(note) ],
      duration: this.renderDuration(note),
      auto_stem: true,
      clef: "treble"
}));