VexFlow セクション記号

VexFlow 使い方に戻る。

概要

　小節区切りの設定をする手順を示します。約1年近く絶賛挫折中でしたが、久しぶりに更新しました。2024年3月中旬時点。このサイトのこの記事がかなり世の中的に期待されているようです。続編を書かないといけないなと思った次第です。次の記事も頑張っていこう！

コード	表示内容
Barline.type.SINGLE	一本線
Barline.type.DOUBLE	二本線
Barline.type.END	二本線で右側が太線
Barline.type.REPEAT_BEGIN	リピート開始記号
Barline.type.REPEAT_END	リピート終了記号
Barline.type.REPEAT_BOTH	リピート両側記号
Barline.type.NONE	線無し

　

小節開始終了線

　コードは以下のとおりです。

<div id="yonet202403Mid_Output01"></div>
<script>
var VF = Vex.Flow;
(function(){
const {
  Factory,
  Stave,
  StaveNote,
  Formatter,
  Voice,
  StaveTie,
  BarLine,
  Renderer
} = Vex.Flow;

let nscale = 0.68
let nwidth = 1040;
let nheight = 320;

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 stave1 = new Stave(10, 50, nHeadMargin + nStaveWidth).setContext(ctx);
stave1.setClef("treble").setContext(ctx);
stave1.setTimeSignature('4/4').setContext(ctx);
//stave1.setBegBarType(4);//BarLine.type.REPEAT_BEGIN
stave1.setBegBarType(VF.Barline.type.REPEAT_BEGIN);//BarLine.type.REPEAT_BEGIN
stave1.draw();

//SINGLE:1, DOUBLE:2, END:3, REPEAT_BEGIN:4, REPEAT_END:5, REPEAT_BOTH:6, NONE:7

const notes1 = [
  new StaveNote({ keys: ["d/5"], duration: "q" }),
  new StaveNote({ keys: ["e/5"], duration: "q" }),
  new StaveNote({ keys: ["f/5"], duration: "q" }),
  new StaveNote({ keys: ["g/5"], duration: "q" }),
];

Formatter.FormatAndDraw(ctx, stave1, notes1);

const tie1 = new StaveTie({
  first_note: notes1[1],
  last_note: notes1[2],
  first_indices: [0],
  last_indices: [0],
});

const tie2 = new StaveTie({
  first_note: notes1[2],
  last_note: notes1[3],
  first_indices: [0],
  last_indices: [0],
});

tie1.setContext(ctx).draw();
tie2.setContext(ctx).draw();


const stave2 = new Stave(stave1.width + stave1.x, stave1.y, nStaveWidth).setContext(ctx);
stave2.setEndBarType(VF.Barline.type.REPEAT_BOTH);
stave2.draw();


const stave3 = new Stave(stave2.width + stave2.x, stave1.y, nStaveWidth).setContext(ctx);
stave3.setEndBarType(VF.Barline.type.NONE);
stave3.draw();


const stave4 = new Stave(stave3.width + stave3.x, stave1.y, nStaveWidth).setContext(ctx);
stave4.setBegBarType(VF.Barline.type.NONE);
stave4.setEndBarType(VF.Barline.type.REPEAT_END);
stave4.draw();


const stave5 = new Stave(stave1.x, stave1.y + 100, nHeadMargin + nStaveWidth).setContext(ctx);
stave5.addClef("treble").setContext(ctx);
stave5.addTimeSignature('4/4').setContext(ctx);
stave5.setEndBarType(VF.Barline.type.SINGLE);//規定値(省略可能)

stave5.draw();

const notes5 = [
  new StaveNote({ keys: ["a/4"], duration: "q" }),
  new StaveNote({ keys: ["b/4"], duration: "q" }),
  new StaveNote({ keys: ["c/5"], duration: "q" }),
  new StaveNote({ keys: ["d/5"], duration: "q" }),
];

Formatter.FormatAndDraw(ctx, stave5, notes5);

const tie3 = new StaveTie({
  first_note: notes5[1],
  last_note: notes5[2],
  first_indices: [0],
  last_indices: [0],
});

const tie4 = new StaveTie({
  first_note: notes5[2],
  last_note: notes5[3],
  first_indices: [0],
  last_indices: [0],
});

tie3.setContext(ctx).draw();
tie4.setContext(ctx).draw();

const stave6 = new Stave(stave5.width + stave5.x, stave5.y, nStaveWidth).setContext(ctx);
stave6.setEndBarType(VF.Barline.type.DOUBLE);

stave6.draw();

const notes6 = [
  new StaveNote({ keys: ["e/5"], duration: "q" }),
  new StaveNote({ keys: ["f/5"], duration: "q" }),
  new StaveNote({ keys: ["g/5"], duration: "q" }),
  new StaveNote({ keys: ["a/5"], duration: "q" }),
];

Formatter.FormatAndDraw(ctx, stave6, notes6);

const tie5 = new StaveTie({
  first_note: notes5[3],
  last_note: notes6[0],
  first_indices: [0],
  last_indices: [0],
});

tie5.setContext(ctx).draw();


const stave7 = new Stave(stave6.width + stave6.x, stave5.y, nStaveWidth).setContext(ctx);
stave7.draw();


const stave8 = new Stave(stave7.width + stave7.x, stave5.y, nStaveWidth).setContext(ctx);
stave8.setEndBarType(VF.Barline.type.END);
stave8.draw();

})();

const svgElement = document.querySelector('#Output svg');
svgElement.style.backgroundColor = '#F5F5F5';
</script>

　

VexFlow 使い方に戻る。