VexFlow タブ譜

VexFlow 使い方に戻る。

概要

　まともにVexFlowを使う気がないので、VexFlowを実直に学びたいという人向けの記事ではなくなる予定です。VexFlow応用しかやりません。覚えてもしょうがないことはやらないのがここの管理人の方針なのです。まずはタブ譜を表示するだけのことをやってみましょう。応用技をつかえば、ベースのタブ譜も描けるようになる優れた技術です。自称ですけど。

　ちな、2024年4月上旬、まだ書きかけの記事です。

　

タブ譜

　コードは以下のとおりです。

<div id="yonet202403Mid_Output01"></div>
<script>
///////////////////////
(function(){
class Position {
  constructor(x = 0, y = 0) {
    this.x = x;
    this.y = y;
  }
}
var VF = Vex.Flow;
const Vocal = new Position();
const Guitar1Inst = new Position();
const Guitar2Inst = new Position();
const Guitar2Tab1 = new Position();
const BaseInst = new Position();
const BaseTab1 = new Position();
const DrumInst = new Position();
const PercInst = new Position();
const Stave9Pos = new Position();

var StaveBase1;
var StaveBase2;
var StaveBase3;
var StaveBase4;

const Perc_note1_1_0 = new Position();

var shiftDrum1;
var shiftPerc1;

function insertBaseEndBarPathToSVG(Stave) {
  var newGroup = document.createElementNS('http://www.w3.org/2000/svg', 'g');
  newGroup.setAttribute('transform', 'translate(0, 0)');
  var path = document.createElementNS('http://www.w3.org/2000/svg', 'path');
  var pathStr = 'M ' + (Stave.x + Stave.width) + ' ' + (Stave.y + 50) +
    ' L ' + (Stave.x + Stave.width) + ' ' + (Stave.y + 80);
  path.setAttribute('d', pathStr);
  path.setAttribute('stroke', 'black');
  path.setAttribute('stroke-width', '1');
  path.setAttribute('fill', 'none');
  newGroup.appendChild(path);
  svgElement.appendChild(newGroup);
}

function insertTextToSVG(options) {
    var textContent = options.textContent;
    var strID = options.strID;
    var Stave_x = options.Stave_x || 0;
    var Stave_y = options.Stave_y || 0;
    var isOffset_x_abs = options.IsOffset_x_Abs || false;
    var Stave_x_Offset = options.Stave_x_Offset || 0;
    var Stave_y_Offset = options.Stave_y_Offset || 0;
    var StaveWidth = options.StaveWidth || 0;
    var StaveHeight = options.StaveHeight || 0;
    var StaveVerticalScale = options.StaveVerticalScale || 0;
    var fontSize = options.fontSize || 40;
    var fontFamily = options.fontFamily || "Bravura, Arial";
    var shift_x = options.shift_x || [0];
    var Rotate = options.Rotate || 0;
    var offset_sum = 0;
    var Stave_x_Offset_Value = 0;
    var Stave_y_Offset_Value = 0;
    var last_Stave_x_Offset = 0;
    var last_Stave_y_Offset = 0;
    var last_textContent = "";
    shift_x.forEach(function(offset, index) {
        offset_sum = offset_sum + offset;
        var newText = document.createElementNS('http://www.w3.org/2000/svg', 'text');
        newText.setAttribute('id', strID + '_' + index); // テキスト要素にIDを付ける
        newText.setAttribute('x', 0);
        newText.setAttribute('y', 0);
        newText.setAttribute('font-family', fontFamily);
        newText.setAttribute('font-size', fontSize);
        newText.setAttribute('fill', 'black');

        if(typeof textContent === "string"){
          newText.textContent = textContent;
        }
        else{
          if(textContent.length - 1 < index){
            newText.textContent = last_textContent;
          }
          else{
            newText.textContent = textContent[index];
            last_textContent = textContent[index];
          }
        }

        if(Stave_x_Offset.length - 1 < index){
          Stave_x_Offset_Value = last_Stave_x_Offset;
        }
        else{
          if(Stave_x_Offset.length >= 2){
            Stave_x_Offset_Value = Stave_x_Offset[index];
            last_Stave_x_Offset = Stave_x_Offset[index];
          }
          else{
            Stave_x_Offset_Value = Stave_x_Offset;
          }
        }

        if(Stave_y_Offset.length - 1 < index){
          Stave_y_Offset_Value = last_Stave_y_Offset;
        }
        else{
          if(Stave_y_Offset.length >= 2){
            Stave_y_Offset_Value = Stave_y_Offset[index];
            last_Stave_y_Offset = Stave_y_Offset[index];
          }
          else{
            Stave_y_Offset_Value = Stave_y_Offset;
          }
        }
        var textGroup = document.createElementNS('http://www.w3.org/2000/svg', 'g');
        if(Rotate != 0){
          textGroup.setAttribute('transform', 'rotate(' + Rotate + ' ' + 0 + ' ' + 0 + ')');
          textGroup.appendChild(newText);
          svgElement.appendChild(textGroup);
        }
        else{
          svgElement.appendChild(newText);
        }
        (function() {
            var textWidth = newText.getBBox().width;
            var textHeight = newText.getBBox().height;
            var horizontalScale;
            if (typeof StaveWidth === 'undefined' || StaveWidth == 0) {
                horizontalScale = 1;
            } 
            else {
                horizontalScale = StaveWidth / textWidth;
            }
            var verticalScale;
            if (typeof StaveHeight === 'undefined' || StaveHeight == 0) {
                verticalScale = 1;
            } 
            else if (StaveVerticalScale != 0) {
                verticalScale = StaveVerticalScale;
            } 
            else {
                verticalScale = StaveHeight / textHeight;
            }
            if(isOffset_x_abs){
              var StavePos_x = offset.x + Stave_x_Offset_Value;
              var StavePos_y = offset.y + Stave_y_Offset_Value;
            }
            else{
              var StavePos_x = Stave_x + Stave_x_Offset + offset_sum;
              var StavePos_y = Stave_y + Stave_y_Offset;
            }

            newText.setAttribute('transform', 'translate(' + StavePos_x + ',' + StavePos_y + ') scale(' + horizontalScale + ',' + verticalScale + ')');

            if(Rotate != 0){
              textGroup.setAttribute('transform', 'rotate(' + Rotate + ' ' + StavePos_x + ' ' + StavePos_y + ')');
            }
        })();

        if(Rotate != 0){
          textGroup.appendChild(newText);
          svgElement.appendChild(textGroup);
        }
        else{
          svgElement.appendChild(newText);
        }
    });
}

var allUniqueIds = [];
(function(){
function addShift(notes, arrx = [], arry = []) {
 
  let tempnote;
  let retShift = [];
  
  for(let i = 0; i < arrx.length || i == 0; i++){
    const pos = new Position();
    //notesのchildrenの各要素について処理
    if(arrx.length === 0){
      tempnote = notes;
    }
    else{
      tempnote = notes[arrx[i]];
      temp_y = arry[i];
    }
    pos.x = tempnote.getAbsoluteX();
    pos.y = tempnote.getStave().getYForLine(temp_y);

    retShift.push(pos);
  }
  return retShift;
}

var UniqueIds;
function getUniqueNoteheadIds(notes, arr = []) {
    //すべてのidを格納するためのセットを作成
    let tempnote;
    uniqueIds = new Set();
    for(let i = 0; i < arr.length || i == 0; i++){
    //notesのchildrenの各要素について処理
      if(arr.length === 0){
        tempnote = notes;
      }
      else{
        tempnote = notes[arr[i]];
      }
      tempnote.children.forEach(child => {
        //typeが"notehead"であるかチェックし、idを取得
        if (child.attrs){
          if(child.attrs.type === "NoteHead") {
            uniqueIds.add(child.attrs.id);
          }
        }
      });
    }
    // セットを配列に変換して戻り値として返す
    return Array.from(uniqueIds);
}

function updateAllUniqueIds(UniqueIds) {
    // allUniqueIdsにUniqueIdsを追加または結合
    if (allUniqueIds.length === 0) {//allUniqueIdsはグローバルな変数
      // allUniqueIdsが空の場合、UniqueIdsをそのままコピー
      allUniqueIds = [...UniqueIds];//スプレッド演算子で要素の中身を書き出す。
    } else {
      UniqueIds.forEach(id => {
        if (!allUniqueIds.includes(id)) {
            allUniqueIds.push(id);
        }
      });
    }
    // 更新されたallUniqueIdsを戻り値として返す
    return allUniqueIds;
}

function dotted(staveNote, noteIndex = -1) {
  if (noteIndex < 0) {
    Dot.buildAndAttach([staveNote], {
      all: true
    });
  } 
  else {
    for(noteIndexValue of noteIndex){
      Dot.buildAndAttach([staveNote], {
        index: noteIndexValue
      });
    }
  }
  return staveNote;
}

const {
  Factory,
  Stave,
  StaveNote,
  Formatter,
  Voice,
  StaveTie,
  BarLine,
  Beam,
  Dot,
  StaveConnector,
  Modifier,
  RenderContext,
  TextDynamics,
  Articulation,
  TextNote,
  Crescendo,
  Renderer
} = Vex.Flow;

let nscale = 0.64;
let nwidth = 1040;
let nheight = 1120;

let nHeadMargin = 70;
let nStaveWidth = 350;

const f = new Factory({ 
  renderer: { elementId: 'yonet202403Mid_Output01', width: nwidth, height: nheight * nscale }
  });
const ctx = f.getContext();
ctx.scale(nscale, nscale);

const defaultStyle = {
  lineWidth: ctx.lineWidth,
  strokeStyle: ctx.strokeStyle,
};

for (let i = 0; i <= nwidth * (1 / nscale); i += 10) {
  ctx.beginPath();
  ctx.moveTo(0 + i, 0);
  ctx.lineTo(0 + i, nheight);
  if (i % 100 === 0){
    ctx.setLineWidth(1);
    ctx.setStrokeStyle('rgba(200, 200, 200, 0.8)');
  }
  else{
    ctx.setLineWidth(0.5);
    ctx.setStrokeStyle('rgba(230, 230, 230, 0.8)');
  }
  ctx.stroke();
}

for (let i = 0; i <= nheight; i += 10) {
  ctx.beginPath();
  ctx.moveTo(0, i);
  ctx.lineTo(nwidth * (1 / nscale), i);
  if (i % 100 === 0){
    ctx.setLineWidth(1);
    ctx.setStrokeStyle('rgba(200, 200, 200, 0.8)');
  }
  else{
    ctx.setLineWidth(0.5);
    ctx.setStrokeStyle('rgba(230, 230, 230, 0.8)');
  }
  ctx.stroke();
}

ctx.lineWidth = defaultStyle.lineWidth;
ctx.strokeStyle = defaultStyle.strokeStyle;

const VocalSt1 = new Stave(80, 30, nHeadMargin + nStaveWidth).setContext(ctx);
VocalSt1.setClef("treble").setContext(ctx);
VocalSt1.setTimeSignature('4/4').setContext(ctx);
VocalSt1.setMeasure(1);
VocalSt1.draw();

Vocal.x = VocalSt1.x - 30;
Vocal.y = VocalSt1.y + 90; 

const VocalSt2 = f.Stave({ x: VocalSt1.width + VocalSt1.x, y: VocalSt1.y, width: nStaveWidth });
VocalSt2.setMeasure(2);
VocalSt2.setContext(ctx).draw();

const VocalSt3 = new Stave(VocalSt2.width + VocalSt2.x, VocalSt1.y, nStaveWidth).setContext(ctx);
VocalSt3.setMeasure(3);
VocalSt3.draw();

const VocalSt4 = new Stave(VocalSt3.width + VocalSt3.x, VocalSt1.y, nStaveWidth).setContext(ctx);
VocalSt4.setMeasure(4);
VocalSt4.draw();

const Guitar1St1 = new Stave(VocalSt1.x, VocalSt1.y + 120, nHeadMargin + nStaveWidth).setContext(ctx);
Guitar1St1.addClef("treble").setContext(ctx);
Guitar1St1.addTimeSignature('4/4').setContext(ctx);
Guitar1St1.draw();

const Guitar1St2 = new Stave(Guitar1St1.width + Guitar1St1.x, Guitar1St1.y, nStaveWidth).setContext(ctx);
Guitar1St2.draw();

const Guitar1St3 = new Stave(Guitar1St2.width + Guitar1St2.x, Guitar1St1.y, nStaveWidth).setContext(ctx);
Guitar1St3.draw();

const Guitar1St4 = new Stave(Guitar1St3.width + Guitar1St3.x, Guitar1St1.y, nStaveWidth).setContext(ctx);
Guitar1St4.draw();

const Guitar1_tab1 = new Stave(Guitar1St1.x, Guitar1St1.y + 110, nHeadMargin + nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 0) continue;
  Guitar1_tab1.setConfigForLine(i, {visible: false} );
}
Guitar1_tab1.draw();

const Guitar1_tab2 = new Stave(Guitar1_tab1.width + Guitar1_tab1.x, Guitar1_tab1.y, nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 0) continue;
  Guitar1_tab2.setConfigForLine(i, {visible: false} );
}
Guitar1_tab2.draw();

const Guitar1_tab3 = new Stave(Guitar1_tab2.width + Guitar1_tab2.x, Guitar1_tab1.y, nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 0) continue;
  Guitar1_tab3.setConfigForLine(i, {visible: false} );
}
Guitar1_tab3.draw();

const Guitar1_tab4 = new Stave(Guitar1_tab3.width + Guitar1_tab3.x, Guitar1_tab1.y, nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 0) continue;
  Guitar1_tab4.setConfigForLine(i, {visible: false} );
}
Guitar1_tab4.draw();

const Guitar1_Tab1 = new Stave(Guitar1St1.x, Guitar1St1.y + 120, nHeadMargin + nStaveWidth).setContext(ctx);
Guitar1_Tab1.draw();

Stave9Pos.x = Guitar1_Tab1.x;
Stave9Pos.y = Guitar1_Tab1.y;

var connector9_2 = new VF.StaveConnector(Guitar1St1, Guitar1_Tab1);
connector9_2.setType(VF.StaveConnector.type.BRACKET);
connector9_2.setContext(ctx);
connector9_2.draw();

Guitar1Inst.x = VocalSt1.x - 30;
Guitar1Inst.y = Guitar1St1.y + ((Guitar1_Tab1.y - Guitar1St1.y) / 2) + 90; 

const Guitar1_Tab2 = new Stave(Guitar1_Tab1.width + Guitar1_Tab1.x, Guitar1_Tab1.y, nStaveWidth).setContext(ctx);
Guitar1_Tab2.draw();

const Guitar1_Tab3 = new Stave(Guitar1_Tab2.width + Guitar1_Tab2.x, Guitar1_Tab1.y, nStaveWidth).setContext(ctx);
Guitar1_Tab3.draw();

const Guitar1_Tab4 = new Stave(Guitar1_Tab3.width + Guitar1_Tab3.x, Guitar1_Tab1.y, nStaveWidth).setContext(ctx);
Guitar1_Tab4.draw();

const Guitar2_St1 = new Stave(Guitar1_Tab1.x, Guitar1_Tab1.y + 120, nHeadMargin + nStaveWidth).setContext(ctx);
Guitar2_St1.addClef("treble").setContext(ctx);
Guitar2_St1.addTimeSignature('4/4').setContext(ctx);
Guitar2_St1.draw();

const Guitar2_St2 = new Stave(Guitar2_St1.width + Guitar2_St1.x, Guitar2_St1.y, nStaveWidth).setContext(ctx);
Guitar2_St2.draw();

const Guitar2_St3 = new Stave(Guitar2_St2.width + Guitar2_St2.x, Guitar2_St2.y, nStaveWidth).setContext(ctx);
Guitar2_St3.draw();

const Guitar2_St4 = new Stave(Guitar2_St3.width + Guitar2_St3.x, Guitar2_St3.y, nStaveWidth).setContext(ctx);
Guitar2_St4.draw();

const Guitar2_Tab1 = new Stave(Guitar2_St1.x, Guitar2_St1.y + 120, nHeadMargin + nStaveWidth).setContext(ctx);
Guitar2_Tab1.draw();

Guitar2Tab1.x = Guitar2_Tab1.x;
Guitar2Tab1.y = Guitar2_Tab1.y;

const Guitar2_Tab2 = new Stave(Guitar2_Tab1.width + Guitar2_Tab1.x, Guitar2_Tab1.y, nStaveWidth).setContext(ctx);
Guitar2_Tab2.draw();

const Guitar2_Tab3 = new Stave(Guitar2_Tab2.width + Guitar2_Tab2.x, Guitar2_Tab2.y, nStaveWidth).setContext(ctx);
Guitar2_Tab3.draw();

const Guitar2_Tab4 = new Stave(Guitar2_Tab3.width + Guitar2_Tab3.x, Guitar2_Tab3.y, nStaveWidth).setContext(ctx);
Guitar2_Tab4.draw();

var Guitar2_connect = new VF.StaveConnector(Guitar2_St1, Guitar2_Tab1);
Guitar2_connect.setType(VF.StaveConnector.type.BRACKET);
Guitar2_connect.setContext(ctx);
Guitar2_connect.draw();

const Guitar2_Tab1_tab = new Stave(Guitar2_Tab1.x, Guitar2_Tab1.y - 10, nHeadMargin + nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 0) continue;
  Guitar2_Tab1_tab.setConfigForLine(i, {visible: false} );
}
Guitar2_Tab1_tab.draw();

const Guitar2_Tab2_tab = new Stave(Guitar2_Tab1_tab.width + Guitar2_Tab1_tab.x, Guitar2_Tab1_tab.y, nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 0) continue;
  Guitar2_Tab2_tab.setConfigForLine(i, {visible: false} );
}
Guitar2_Tab2_tab.draw();

const Guitar2_Tab3_tab = new Stave(Guitar2_Tab2_tab.width + Guitar2_Tab2_tab.x, Guitar2_Tab2_tab.y, nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 0) continue;
  Guitar2_Tab3_tab.setConfigForLine(i, {visible: false} );
}
Guitar2_Tab3_tab.draw();

const Guitar2_Tab4_tab = new Stave(Guitar2_Tab3_tab.width + Guitar2_Tab3_tab.x, Guitar2_Tab3_tab.y, nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 0) continue;
  Guitar2_Tab4_tab.setConfigForLine(i, {visible: false} );
}
Guitar2_Tab4_tab.draw();

Guitar2Inst.x = Guitar2_St1.x - 30;
Guitar2Inst.y = Guitar2_St1.y + ((Guitar2_Tab1.y - Guitar2_St1.y) / 2) + 90; 

const Base_St1 = new Stave(Guitar2_Tab1.x, Guitar2_Tab1.y + 120, nHeadMargin + nStaveWidth).setContext(ctx);
Base_St1.addClef("treble").setContext(ctx);
Base_St1.addTimeSignature('4/4').setContext(ctx);
Base_St1.draw();

const Base_St2 = new Stave(Base_St1.width + Base_St1.x, Base_St1.y, nStaveWidth).setContext(ctx);
Base_St2.draw();

const Base_St3 = new Stave(Base_St2.width + Base_St2.x, Base_St2.y, nStaveWidth).setContext(ctx);
Base_St3.draw();

const Base_St4 = new Stave(Base_St3.width + Base_St3.x, Base_St3.y, nStaveWidth).setContext(ctx);
Base_St4.draw();

const Base_Tab1 = new Stave(Base_St1.x, Base_St1.y + 120, nHeadMargin + nStaveWidth).setContext(ctx);
Base_Tab1.setEndBarType(VF.Barline.type.NONE);
for (var i = 0; i < 5; i++) {
  if (i != 0) continue;
  Base_Tab1.setConfigForLine(i, {visible: false} );
}
Base_Tab1.draw();

BaseTab1.x = Base_Tab1.x;
BaseTab1.y = Base_Tab1.y;

BaseInst.x = Base_St1.x - 30;
BaseInst.y = Base_St1.y + ((Base_Tab1.y - Base_St1.y) / 2) + 90; 

StaveBase1 = Base_Tab1;

const Base_Tab2 = new Stave(Base_Tab1.width + Base_Tab1.x, Base_Tab1.y, nStaveWidth).setContext(ctx);
Base_Tab2.setBegBarType(VF.Barline.type.NONE);
Base_Tab2.setEndBarType(VF.Barline.type.NONE);
for (var i = 0; i < 5; i++) {
  if (i != 0) continue;
  Base_Tab2.setConfigForLine(i, {visible: false} );
}
Base_Tab2.draw();

StaveBase2 = Base_Tab2;

const Base_Tab3 = new Stave(Base_Tab2.width + Base_Tab2.x, Base_Tab2.y, nStaveWidth).setContext(ctx);
Base_Tab3.setBegBarType(VF.Barline.type.NONE);
Base_Tab3.setEndBarType(VF.Barline.type.NONE);
for (var i = 0; i < 5; i++) {
  if (i != 0) continue;
  Base_Tab3.setConfigForLine(i, {visible: false} );
}
Base_Tab3.draw();

StaveBase3 = Base_Tab3;

const Base_Tab4 = new Stave(Base_Tab3.width + Base_Tab3.x, Base_Tab3.y, nStaveWidth).setContext(ctx);
Base_Tab4.setBegBarType(VF.Barline.type.NONE);
Base_Tab4.setEndBarType(VF.Barline.type.NONE);
for (var i = 0; i < 5; i++) {
  if (i != 0) continue;
  Base_Tab4.setConfigForLine(i, {visible: false} );
}
Base_Tab4.draw();

StaveBase4 = Base_Tab4;

var Base_connect = new VF.StaveConnector(Base_St1, Base_Tab1);
Base_connect.setType(VF.StaveConnector.type.BRACKET);
Base_connect.setContext(ctx);
Base_connect.draw();

const Drum_St1 = new Stave(Base_Tab1.x, Base_Tab1.y + 120, nHeadMargin + nStaveWidth).setContext(ctx);
Drum_St1.addClef("bass").setContext(ctx);
Drum_St1.addTimeSignature('4/4').setContext(ctx);
Drum_St1.draw();

DrumInst.x = Drum_St1.x - 30;
DrumInst.y = Drum_St1.y + 90; 

const Drum_St1_1 = new Stave(nHeadMargin + Base_Tab1.x, Base_Tab1.y + 120, 0).setContext(ctx);
Drum_St1_1.setBegBarType(VF.Barline.type.NONE);
Drum_St1_1.setEndBarType(VF.Barline.type.NONE);
Drum_St1_1.draw();

const Drum_notes1_1 = [
  new StaveNote({ keys: ["f/4"], duration: "4", stem_direction: -1 }),
  new StaveNote({ keys: ["c/4"], duration: "4r" }),
  new StaveNote({ keys: ["c/4"], duration: "8r" }),
  new StaveNote({ keys: ["f/4"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["c/4"], duration: "8r" }),
  new StaveNote({ keys: ["f/4"], duration: "8", stem_direction: -1 })
];
const Drum_beam1_1 = new VF.Beam([Drum_notes1_1[3],Drum_notes1_1[5]]);

var Drum_St1_1Voice = new Vex.Flow.Voice({ num_beats: 4, beat_value: 4 });
Drum_St1_1Voice.setStrict(true);
Drum_St1_1Voice.addTickables(Drum_notes1_1);

const Drum_St1_2 = new Stave(nHeadMargin + Base_Tab1.x, Base_Tab1.y + 120, 0).setContext(ctx);
Drum_St1_2.setBegBarType(VF.Barline.type.NONE);
Drum_St1_2.setEndBarType(VF.Barline.type.NONE);
Drum_St1_2.draw();

const Drum_notes1_2 = [
  new VF.StaveNote({ keys: ["g/5"], duration: "8", stem_direction: 1 }),
  new VF.StaveNote({ keys: ["g/5"], duration: "8", stem_direction: 1 }),
  new VF.StaveNote({ keys: ["c/5"], duration: "8", stem_direction: 1 }),
  new VF.StaveNote({ keys: ["g/5"], duration: "16", stem_direction: 1 }),
  new VF.StaveNote({ keys: ["c/5"], duration: "16", stem_direction: 1 }),
  new VF.StaveNote({ keys: ["g/5"], duration: "8", stem_direction: 1 }),
  new VF.StaveNote({ keys: ["g/5"], duration: "8", stem_direction: 1 }),
  new VF.StaveNote({ keys: ["c/5"], duration: "8", stem_direction: 1 }),
  new VF.StaveNote({ keys: ["g/5"], duration: "8", stem_direction: 1 })
];

const Drum_notes1_3 = [
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),

  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),

  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),

  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 }),
  new VF.GhostNote({ keys: ["a/5"], duration: "16", stem_direction: 1 })
];

UniqueIds = getUniqueNoteheadIds(Drum_notes1_2, [0, 1, 3, 5, 6, 8]);
allUniqueIds = updateAllUniqueIds(UniqueIds);

const Drum_beam1_2_1 = new VF.Beam([Drum_notes1_2[0], Drum_notes1_2[1]]);
const Drum_beam1_2_2 = new VF.Beam([Drum_notes1_2[2], Drum_notes1_2[3], Drum_notes1_2[4]]);
const Drum_beam1_2_3 = new VF.Beam([Drum_notes1_2[5], Drum_notes1_2[6], Drum_notes1_2[7], Drum_notes1_2[8]]);

var Drum_St1_2Voice = new Vex.Flow.Voice({ num_beats: 4, beat_value: 4 });
Drum_St1_2Voice.setStrict(true);
Drum_St1_2Voice.addTickables(Drum_notes1_2);

var Drum_St1_3Voice = new Vex.Flow.Voice({ num_beats: 4, beat_value: 4 });
Drum_St1_3Voice.setStrict(true);
Drum_St1_3Voice.addTickables(Drum_notes1_3);

var formatterDrum_St1_2 = new Vex.Flow.Formatter().joinVoices([Drum_St1_3Voice, Drum_St1_1Voice, Drum_St1_2Voice]);
//formatter13_2.formatToStave([stave13_3Voice, stave13_1Voice, stave13_2Voice], stave13_2);
formatterDrum_St1_2.format([Drum_St1_3Voice, Drum_St1_1Voice, Drum_St1_2Voice], nStaveWidth - 30);
Drum_St1_1Voice.draw(ctx, Drum_St1_2);
Drum_St1_2Voice.draw(ctx, Drum_St1_2);

Drum_beam1_1.setContext(ctx).draw();

Drum_beam1_2_1.setContext(ctx).draw();
Drum_beam1_2_2.setContext(ctx).draw();
Drum_beam1_2_3.setContext(ctx).draw();

shiftDrum1 = addShift(
  Drum_notes1_2, 
  [0, 1, 2, 3, 5, 5, 6, 6, 7, 7, 8, 8],
  [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
);


const Drum_St2 = new Stave(Drum_St1.width + Drum_St1.x, Drum_St1.y, nStaveWidth).setContext(ctx);
Drum_St2.draw();


const Drum_St3 = new Stave(Drum_St2.width + Drum_St2.x, Drum_St1.y, nStaveWidth).setContext(ctx);
Drum_St3.draw();


const Drum_St4 = new Stave(Drum_St3.width + Drum_St3.x, Drum_St1.y, nStaveWidth).setContext(ctx);
Drum_St4.draw();


const Perc_St1 = new Stave(Drum_St1.x, Drum_St1.y + 100, nHeadMargin + nStaveWidth).setContext(ctx);
Perc_St1.addTimeSignature('4/4').setContext(ctx);

const Perc_St1_1 = new Stave(nHeadMargin + Drum_St1.x, Drum_St1.y + 100, 0).setContext(ctx);
Perc_St1_1.setBegBarType(VF.Barline.type.NONE);
Perc_St1_1.setEndBarType(VF.Barline.type.NONE);
Perc_St1_1.draw();

for (var i = 0; i < 5; i++) {
  if (i == 2) continue;
  Perc_St1.setConfigForLine(i, {visible: false} );
}

Perc_St1.draw();

PercInst.x = Perc_St1.x - 30;
PercInst.y = Perc_St1.y + 90; 

var AllConnector = new VF.StaveConnector(VocalSt1, Perc_St1);
AllConnector.setType(VF.StaveConnector.type.SINGLE);
AllConnector.setContext(ctx);
AllConnector.draw();

const Perc_notes1_1 = [
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),

  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),

  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),

  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 }),
  new VF.StaveNote({ keys: ["a/4"], duration: "16", stem_direction: -1 })
];
UniqueIds = getUniqueNoteheadIds(Perc_notes1_1, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]);
allUniqueIds = updateAllUniqueIds(UniqueIds);

const Perc_beam1_1_1 = new VF.Beam([Perc_notes1_1[0], Perc_notes1_1[1], Perc_notes1_1[2], Perc_notes1_1[3]]);
const Perc_beam1_1_2 = new VF.Beam([Perc_notes1_1[4], Perc_notes1_1[5], Perc_notes1_1[6], Perc_notes1_1[7]]);
const Perc_beam1_1_3 = new VF.Beam([Perc_notes1_1[8], Perc_notes1_1[9], Perc_notes1_1[10], Perc_notes1_1[11]]);
const Perc_beam1_1_4 = new VF.Beam([Perc_notes1_1[12], Perc_notes1_1[13], Perc_notes1_1[14], Perc_notes1_1[15]]);

var Perc_St1_1Voice = new Vex.Flow.Voice({ num_beats: 4, beat_value: 4 });
Perc_St1_1Voice.setStrict(true);
Perc_St1_1Voice.addTickables(Perc_notes1_1);

var formatterPerc_St1_1 = new Vex.Flow.Formatter().joinVoices([Perc_St1_1Voice]);
//formatterPerc_St1_1.formatToStave([stave17_1Voice], Perc_St1_1);
formatterPerc_St1_1.format([Perc_St1_1Voice], nStaveWidth - 30);
Perc_St1_1Voice.draw(ctx, Perc_St1_1);

Perc_beam1_1_1.setContext(ctx).draw();
Perc_beam1_1_2.setContext(ctx).draw();
Perc_beam1_1_3.setContext(ctx).draw();
Perc_beam1_1_4.setContext(ctx).draw();

Perc_note1_1_0.x = Perc_notes1_1[0].getAbsoluteX();
Perc_note1_1_0.y = Perc_notes1_1[0].getStave().getYForLine(1);

shiftPerc1 = addShift(
  Perc_notes1_1, 
  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15],
  [4, 4, 4, 4, 4, 4, 4, 4, 4, 4,  4,  4,  4,  4,  4,  4]
);

const Perc_St2 = new Stave(Perc_St1.width + Perc_St1.x, Perc_St1.y, nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 2) continue;
  Perc_St2.setConfigForLine(i, {visible: false} );
}
Perc_St2.draw();

const Perc_St3 = new Stave(Perc_St2.width + Perc_St2.x, Perc_St2.y, nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 2) continue;
  Perc_St3.setConfigForLine(i, {visible: false} );
}
Perc_St3.draw();

const Perc_St4 = new Stave(Perc_St3.width + Perc_St3.x, Perc_St3.y, nStaveWidth).setContext(ctx);
for (var i = 0; i < 5; i++) {
  if (i == 2) continue;
  Perc_St4.setConfigForLine(i, {visible: false} );
}
Perc_St4.draw();

})();

const svgElement2 = document.querySelector('#yonet202403Mid_Output01 svg');
svgElement2.style.backgroundColor = '#F5F5F5';
var svgContainer = document.getElementById('yonet202403Mid_Output01');
var svgElement = svgContainer.querySelector('svg');

var VocalText_options = {
    textContent: ["Vocal"], // 必須文字列
    strID: "VocalText", // 必須
    Stave_x: Vocal.x,
    Stave_y: Vocal.y,
    fontFamily: "Arial, sans-serif",
    fontSize: "20pt",
    Rotate: -90
};
insertTextToSVG(VocalText_options);

var EGuitarText_options = {
    textContent: ["E.Guitar1"], // 必須文字列
    strID: "EGuitarText", // 必須
    Stave_x: Guitar1Inst.x,
    Stave_y: Guitar1Inst.y,
    fontFamily: "Arial, sans-serif",
    fontSize: "20pt",
    Rotate: -90
};
insertTextToSVG(EGuitarText_options);

var EGuitarTab_options = {
    textContent: ["＠"], // 必須文字列
    strID: "EGuitarTab", // 必須
    Stave_x: Stave9Pos.x,
    Stave_y: Stave9Pos.y,
    Stave_x_Offset: 10,
    Stave_y_Offset: 80,
    fontFamily: "YonetMuFL, Arial",
};
insertTextToSVG(EGuitarTab_options);

var EGuitar2Text_options = {
    textContent: ["E.Guitar2"], // 必須文字列
    strID: "EGuitar2Text", // 必須
    Stave_x: Guitar2Inst.x,
    Stave_y: Guitar2Inst.y,
    fontFamily: "Arial, sans-serif",
    fontSize: "20pt",
    Rotate: -90
};
insertTextToSVG(EGuitar2Text_options);

var EGuitar2Tab_options = {
    textContent: ["＠"], // 必須文字列
    strID: "EGuitar2Tab", // 必須
    Stave_x: Guitar2Tab1.x,
    Stave_y: Guitar2Tab1.y,
    Stave_x_Offset: 10,
    Stave_y_Offset: 80,
    fontFamily: "YonetMuFL, Arial",
};
insertTextToSVG(EGuitar2Tab_options);

var BaseText_options = {
    textContent: ["Base"], // 必須文字列
    strID: "BaseText", // 必須
    Stave_x: BaseInst.x,
    Stave_y: BaseInst.y,
    fontFamily: "Arial, sans-serif",
    fontSize: "20pt",
    Rotate: -90
};
insertTextToSVG(BaseText_options);

var BaseTab_options = {
    textContent: ["＠"], // 必須文字列
    strID: "BaseTab", // 必須
    Stave_x: BaseTab1.x,
    Stave_y: BaseTab1.y,
    Stave_x_Offset: 10,
    Stave_y_Offset: 90,
    fontFamily: "YonetMuFL, Arial",
};
insertTextToSVG(BaseTab_options);

insertBaseEndBarPathToSVG(StaveBase1);
insertBaseEndBarPathToSVG(StaveBase2);
insertBaseEndBarPathToSVG(StaveBase3);
insertBaseEndBarPathToSVG(StaveBase4);

var DrumText_options = {
    textContent: ["Drum"], // 必須文字列
    strID: "DrumText", // 必須
    Stave_x: DrumInst.x,
    Stave_y: DrumInst.y,
    fontFamily: "Arial, sans-serif",
    fontSize: "20pt",
    Rotate: -90
};
insertTextToSVG(DrumText_options);

var PercText_options = {
    textContent: ["Perc."], // 必須文字列
    strID: "PercText", // 必須
    Stave_x: PercInst.x,
    Stave_y: PercInst.y,
    fontFamily: "Arial, sans-serif",
    fontSize: "20pt",
    Rotate: -90
};
insertTextToSVG(PercText_options);

var note13_2_0_option = {
    textContent: ["\uFF65", "\uFF65", "\uFF65", "\uFF65", 
                  "\uFF65", "\uFF68", "\uFF66", "\uFF67", "\uFF65", "\uFF0B", "\uFF65", "\uFF0F"], // 必須文字列
                 //x      ,   half_o,         ,        >,         ,       + ,         ,        o
    strID: "note13_2_0", // 必須
    Stave_y_Offset: [   -5,       -5,       -5,       -5,
                        -5,      -60,       -5,      -60,       -5,      -60,       -5,      -60],
    fontFamily: "YonetMuFL, Arial", // オプション、デフォルトは"Bravura, Arial"
    shift_x: shiftDrum1, // xのオフセット値配列
    IsOffset_x_Abs: true
};
insertTextToSVG(note13_2_0_option);

var Perc_notes1_1_0_Shaker_option = {
    textContent: ["＜ Ｓｈａｋｅｒ ＞"], // 必須文字列
    strID: "Perc_notes1_1_0_shaker", // 必須
    Stave_x: Perc_note1_1_0.x,
    Stave_y: Perc_note1_1_0.y,
    Stave_x_Offset: -20,
    Stave_y_Offset: 0,
    fontSize: 60,
    fontFamily: "YonetMuFL, Arial", // オプション、デフォルトは"Bravura, Arial"
    shift_x: [0] // xのオフセット値配列
};
insertTextToSVG(Perc_notes1_1_0_Shaker_option);

var Perc_notes1_1_0_option = {
    textContent: ["\uFF69"], // 必須文字列
    strID: "Perc_notes1_1_0", // 必須
    Stave_y_Offset: -5,
    fontFamily: "YonetMuFL, Arial", // オプション、デフォルトは"Bravura, Arial"
    shift_x: shiftPerc1, // xのオフセット値配列
    IsOffset_x_Abs: true
};
insertTextToSVG(Perc_notes1_1_0_option);

// 透明にするIDの配列
// 例としてここでIDを指定
let autoUniqueIds = allUniqueIds.map(id => "vf-" + id);

// 各IDに対して処理
autoUniqueIds.forEach(id => {
    // 該当するIDの要素を取得
    let element = svgElement.getElementById(id);
    if (element) {
        // 該当する要素があれば、描画内容を透明にする
        let paths = element.querySelectorAll("path");
        paths.forEach(path => {
            path.setAttribute("fill", "none");
            path.setAttribute("stroke", "none");
        });
    }
});

})();

</script>

　タブ譜を描いただけですが、ここではVexFlowのタブ譜の技術は使わず、通常の五線譜を二つ重ねているだけです。線が重なると少し汚くなるので、必要最小限になるよう。重ねる五線譜の一つは、10ピクセル上にずらした上で、一番上の線だけを描いています。小節線の長さは調節できないので、一部重なっています。これで6線50ピクセルの幅のタブ譜になります。TAB記号は自作のフォントを前の記事でもやった方法で追加しています。

　ベースのタブ譜は逆に4線譜にしないといけないので、ひとつ削っています。ただし、このままだと小節線が飛び出してしまうので、VexFlowの機能の小節線は描かないようにしました。そして、あらたに作った関数で、30ピクセルの小節線を描くようにしています。なので、この先、二重線にしたり、リピート記号を描いたりする必要が出てきたら、また関数はちょこっと変えていかないといけないのだと思います。繰り返し記号など全部の小節線の種類を網羅しないといけないですね。ベースタブ譜は公式でも対応できないので、これくらいの苦労はしかたないですね。

• insertBaseEndBarPathToSVG(Stave)

　引数のStaveオブジェクトが示す小節に対して30ピクセルの縦線をひくという関数です。

第一引数：ベース用のタブ譜向けの短い小節線をひきたい小節のオブジェクトをVexFlowの描画が終わったあとのグローバルな領域でも参照できるようにしたStave型のオブジェクトを引数に設定します。

　次の記事からタブ譜の中身を描くことに挑戦していかないといけないので、まだまだ創造力をはたからせないとタブ譜は完成しなさそうです。

　

VexFlow 使い方に戻る。