VexFlow クレシェンド・デクレシェンド

VexFlow 使い方に戻る。

概要

　クレシェンドやデクレシェンドもTextDynamics同様、音の長さの概念をもった仕組みを利用しますので、またVoiceクラスやFormatterクラスのお世話になるややこしさがあります。

アクセント記号の種類

コード	表示内容
a.	ドット、アクセント
av	縦長シングルクォートみたいな、スタッカーティッシモ
a>	> 記号、アクセント、マルカートの一種、反対向きは無いです。
a^	^ 記号、山型アクセント、マルカートの一種
a-	- 記号、テヌート、はっきり伸ばす。 普段から意識しろってことだけど
a+	+ 記号、レフトハンドピッチカート。 バイオリンの奏法。左手で弦を弾く。
ao	oの上に側に|の記号。スナップピッチカート。 バルトークピチカートとも。マルカート。 垂直に弾いて指版に弦を当てる奏法だそうです。
a|	V みたいな記号。Downストロークの意味
am	下開きのコみたいな記号。Upストロークの意味
a@a	フェルマータの下開き
a@u	フェルマータの上開き

　

クレシェンド・デクレシェンド

　コードは以下のとおりです。

<div id="yonet202403Mid_Output01"></div>
<script>
class Position {
  constructor(x, y) {
    this.x = x;
    this.y = y;
  }
}
var VF = Vex.Flow;
const Instrument1 = new Position(0, 0);
const Instrument2 = new Position(0, 0);
(function(){
const {
  Factory,
  Stave,
  StaveNote,
  Formatter,
  Voice,
  StaveTie,
  BarLine,
  StaveConnector,
  Modifier,
  RenderContext,
  TextDynamics,
  Articulation,
  Renderer
} = Vex.Flow;

let nscale = 0.64;
let nwidth = 1040;
let nheight = 720;

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(80, 150, nHeadMargin + nStaveWidth).setContext(ctx);
stave1.setClef("treble").setContext(ctx);
stave1.setTimeSignature('4/4').setContext(ctx);
stave1.setSection("A", 0);
stave1.setMeasure(1);
stave1.setTempo({ duration: "q", dots: 0, bpm: 120 }, 0);
stave1.setBegBarType(VF.Barline.type.REPEAT_BEGIN);//BarLine.type.REPEAT_BEGIN

Instrument1.x = stave1.x - 30;
Instrument1.y = stave1.y + 90; 

stave1.draw();

const notes1 = [
  new StaveNote({ keys: ["d/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["e/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["f/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["g/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["a/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["b/5"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["c/6"], duration: "8", stem_direction: -1 }),
  new StaveNote({ keys: ["d/6"], duration: "8", stem_direction: -1 }),
];
//ここで各ノートに指定したアーティキュレーションを追加
notes1[0].addModifier(new VF.Articulation('a.').setPosition(3));
notes1[1].addModifier(new VF.Articulation('av').setPosition(3));
notes1[2].addModifier(new VF.Articulation('a>').setPosition(3));
notes1[3].addModifier(new VF.Articulation('a^').setPosition(3));
notes1[4].addModifier(new VF.Articulation('a-').setPosition(3));
notes1[5].addModifier(new VF.Articulation('a+').setPosition(3));
notes1[6].addModifier(new VF.Articulation('ao').setPosition(3));
notes1[7].addModifier(new VF.Articulation('a|').setPosition(3));

Formatter.FormatAndDraw(ctx, stave1, notes1);

var stave2 = new Vex.Flow.Stave(stave1.width + stave1.x, stave1.y, nStaveWidth);
var stave1002 = new Vex.Flow.Stave(stave1.width + stave1.x, stave1.y + 120, 0);
stave2.setEndBarType(VF.Barline.type.REPEAT_BOTH);
stave2.setMeasure(2);
stave2.setTempo({ name: "Andante", note: "8", bpm: 120 }, 0);
stave2.setContext(ctx).draw();

var note2_1 = new Vex.Flow.StaveNote({ keys: ["F/4"], duration: "8" });
var note2_2 = new Vex.Flow.StaveNote({ keys: ["C/5"], duration: "8", stem_direction: -1 });
var note2_3 = new Vex.Flow.StaveNote({ keys: ["D/4"], duration: "8" });
var note2_4 = new Vex.Flow.StaveNote({ keys: ["C/4"], duration: "8" });
var note2_5 = new Vex.Flow.StaveNote({ keys: ["B/3"], duration: "8" });
var note2_6 = new Vex.Flow.StaveNote({ keys: ["A/3"], duration: "8" });
var note2_7 = new Vex.Flow.StaveNote({ keys: ["G/3"], duration: "8" });
var note2_8 = new Vex.Flow.StaveNote({ keys: ["F/3"], duration: "8" });

//ここで各ノートに指定したアーティキュレーションを追加
note2_1.addModifier(new VF.Articulation('am').setPosition(4));
note2_2.addModifier(new VF.Articulation('a@a').setPosition(3));
note2_3.addModifier(new VF.Articulation('a@u').setPosition(4));

var stave2Voice = new Vex.Flow.Voice({ num_beats: 4, beat_value: 4 });
stave2Voice.addTickables([note2_1, note2_2, note2_3, note2_4, note2_5, note2_6, note2_7, note2_8]);

var formatter2 = new Vex.Flow.Formatter().joinVoices([stave2Voice]);//.format([stave2Voice], nStaveWidth);
formatter2.formatToStave([stave2Voice], stave2);

stave2Voice.draw(ctx, stave2);

var Dynamics2_1 = new Vex.Flow.TextDynamics({ text: "sfz", duration: "2" });
var Dynamics2_3 = new Vex.Flow.TextDynamics({ text: "p", duration: "4" });
var Dynamics2_4 = new Vex.Flow.TextDynamics({ text: "f", duration: "4" });
var stave2VoiceDynamics = new Vex.Flow.Voice({ num_beats: 4, beat_value: 4 });
stave2VoiceDynamics.addTickables([Dynamics2_1, Dynamics2_3, Dynamics2_4]);


var Dynamics_formatter2 = new Vex.Flow.Formatter().joinVoices([stave2VoiceDynamics]);
Dynamics_formatter2.format([stave2VoiceDynamics], nStaveWidth);

stave2VoiceDynamics.draw(ctx, stave1002);


var note2_1_X = note2_1.getAbsoluteX();
var staveFrom1To4_Y = note2_1.getStave().getYForLine(2.5);

const stave3 = new Stave(stave2.width + stave2.x, stave1.y, nStaveWidth).setContext(ctx);
stave3.setEndBarType(VF.Barline.type.NONE);
stave3.setSection("B", 0);
stave3.setMeasure(3);
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.setMeasure(4);
stave4.draw();


const stave5 = new Stave(stave1.x, stave1.y + 200, nHeadMargin + nStaveWidth).setContext(ctx);
stave5.addClef("treble").setContext(ctx);
stave5.addTimeSignature('4/4').setContext(ctx);
stave5.setSection("C", 0);
stave5.setMeasure(5);
stave5.setEndBarType(VF.Barline.type.SINGLE);//規定値(省略可能)

stave5.draw();

var connector = new VF.StaveConnector(stave1, stave5);
connector.setType(VF.StaveConnector.type.SINGLE);
connector.setContext(ctx);
connector.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.setMeasure(6);

stave6.draw();

const notes6 = [
  new StaveNote({ keys: ["e/5"], duration: "q", stem_direction: -1 }),
  new StaveNote({ keys: ["f/5"], duration: "q", stem_direction: -1 }),
  new StaveNote({ keys: ["g/5"], duration: "q", stem_direction: -1 }),
  new StaveNote({ keys: ["a/5"], duration: "q", stem_direction: -1 }),
];

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.setMeasure(7);
stave7.draw();


const stave8 = new Stave(stave7.width + stave7.x, stave5.y, nStaveWidth).setContext(ctx);
stave8.setMeasure(8);
stave8.draw();


const stave9 = new Stave(stave5.x, stave5.y + 200, nHeadMargin + nStaveWidth).setContext(ctx);
stave9.setMeasure(9);
stave9.draw();

var connector9 = new VF.StaveConnector(stave5, stave9);
connector9.setType(VF.StaveConnector.type.SINGLE);
connector9.setContext(ctx);
connector9.draw();

var connector9_2 = new VF.StaveConnector(stave5, stave9);
connector9_2.setType(VF.StaveConnector.type.BRACKET);
connector9_2.setContext(ctx);
connector9_2.draw();

Instrument2.x = stave1.x - 30;
Instrument2.y = stave5.y + ((stave9.y - stave5.y) / 2) + 90; 


const stave10 = new Stave(stave9.width + stave9.x, stave9.y, nStaveWidth).setContext(ctx);
stave10.setMeasure(10);
stave10.draw();


const stave11 = new Stave(stave10.width + stave10.x, stave9.y, nStaveWidth).setContext(ctx);
stave11.setMeasure(11);
stave11.draw();


const stave12 = new Stave(stave11.width + stave11.x, stave9.y, nStaveWidth).setContext(ctx);
stave12.setMeasure(12);
stave12.draw();

})();

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

var svgContainer = document.getElementById('yonet202403Mid_Output01');

var svgElement = svgContainer.querySelector('svg');

var newText = document.createElementNS('http://www.w3.org/2000/svg', 'text');
newText.setAttribute('x', '100');
newText.setAttribute('y', '100');
newText.setAttribute('font-family', 'Hiragino Kaku Gothic Pro, メイリオ, MS Gothic, sans-serif');
newText.setAttribute('font-size', '50');
newText.setAttribute('fill', 'black');
newText.textContent = 'TestTitle - subTitle - lyrics: yo-net, music: yo-net';

svgElement.appendChild(newText);


var newText2 = document.createElementNS('http://www.w3.org/2000/svg', 'text');
newText2.setAttribute('x', Instrument1.x);
newText2.setAttribute('y', Instrument1.y);
newText2.setAttribute('font-family', 'Bravura, VexFlow, Arial, sans-serif');
newText2.setAttribute('font-size', '20pt');
newText2.setAttribute('fill', 'black');
newText2.textContent = 'Vocal';

var textGroup2 = document.createElementNS('http://www.w3.org/2000/svg', 'g');
textGroup2.setAttribute('transform', 'rotate(-90 ' + Instrument1.x + ' ' + Instrument1.y + ')');

textGroup2.appendChild(newText2);

svgElement.appendChild(textGroup2);

var newText3 = document.createElementNS('http://www.w3.org/2000/svg', 'text');
newText3.setAttribute('x', Instrument2.x);
newText3.setAttribute('y', Instrument2.y);
newText3.setAttribute('font-family', 'Bravura, VexFlow, Arial, sans-serif');
newText3.setAttribute('font-size', '20pt');
newText3.setAttribute('fill', 'black');
newText3.textContent = 'E.Guitar';

var textGroup3 = document.createElementNS('http://www.w3.org/2000/svg', 'g');
textGroup3.setAttribute('transform', 'rotate(-90 ' + Instrument2.x + ' ' + Instrument2.y + ')');

textGroup3.appendChild(newText3);

svgElement.appendChild(textGroup3);
</script>

　できたね。音符を定義したところに例えば、notes1というオブジェクトにノートの配列を保持している場合は

const notes1 = [

　new StaveNote({ keys: ["d/5"], duration: "8", stem_direction: -1 }),

　省略

　new StaveNote({ keys: ["d/6"], duration: "8", stem_direction: -1 }),

];

　に対しては

notes1[0].addModifier(new VF.Articulation('a.').setPosition(3));

　のようにして、addModifier関数を呼び出し、

var note2_1 = new Vex.Flow.StaveNote({ keys: ["F/4"], duration: "8" });

　のように定義されたノートには

note2_1.addModifier(new VF.Articulation('a.').setPosition(3));

　のように定義して、addModifier関数を呼び出します。

第一引数：Articurationクラスのコンストラクタと、その下のsetPositionのコンストラクタにも引数を定義します。

　Articurationの

第一引数：冒頭で紹介したコードを付与します。

　setPositionの

第一引数：3なら音符の上なので、通常はノート作成の際 , stem_direction: -1 と定義した音符に3を指定します。4なら音符の下にアーティキュレーションが追加されます。なので stem_direction: 1 か、省略されたノートに対して4を指定します。

　そんなところですね。

　

VexFlow 使い方に戻る。