vexflow
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A JavaScript library for rendering music notation and guitar tablature
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<h1>vibrato.js</h1>
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<h3>Table of Contents</h3>
<ol>
<li>
<a class="source" href="accidental.html">
accidental.js
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<a class="source" href="annotation.html">
annotation.js
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<a class="source" href="articulation.html">
articulation.js
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<a class="source" href="barnote.html">
barnote.js
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<a class="source" href="beam.html">
beam.js
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<li>
<a class="source" href="bend.html">
bend.js
</a>
</li>
<li>
<a class="source" href="boundingbox.html">
boundingbox.js
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<li>
<a class="source" href="boundingboxcomputation.html">
boundingboxcomputation.js
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<li>
<a class="source" href="canvascontext.html">
canvascontext.js
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<a class="source" href="clef.html">
clef.js
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<a class="source" href="clefnote.html">
clefnote.js
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<a class="source" href="crescendo.html">
crescendo.js
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<a class="source" href="curve.html">
curve.js
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<a class="source" href="dot.html">
dot.js
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<a class="source" href="easyscore.html">
easyscore.js
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<a class="source" href="element.html">
element.js
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<a class="source" href="factory.html">
factory.js
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<a class="source" href="formatter.html">
formatter.js
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<a class="source" href="fraction.html">
fraction.js
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<a class="source" href="frethandfinger.html">
frethandfinger.js
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<a class="source" href="ghostnote.html">
ghostnote.js
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<a class="source" href="glyph.html">
glyph.js
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<a class="source" href="glyphnote.html">
glyphnote.js
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<a class="source" href="gracenote.html">
gracenote.js
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<a class="source" href="gracenotegroup.html">
gracenotegroup.js
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<li>
<a class="source" href="gracetabnote.html">
gracetabnote.js
</a>
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<a class="source" href="index.html">
index.js
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<li>
<a class="source" href="keymanager.html">
keymanager.js
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<a class="source" href="keysignature.html">
keysignature.js
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<a class="source" href="keysignote.html">
keysignote.js
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<a class="source" href="modifier.html">
modifier.js
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<a class="source" href="modifiercontext.html">
modifiercontext.js
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<a class="source" href="multimeasurerest.html">
multimeasurerest.js
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<a class="source" href="music.html">
music.js
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<a class="source" href="note.html">
note.js
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<a class="source" href="notehead.html">
notehead.js
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<a class="source" href="notesubgroup.html">
notesubgroup.js
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<a class="source" href="ornament.html">
ornament.js
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<a class="source" href="parser.html">
parser.js
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<li>
<a class="source" href="pedalmarking.html">
pedalmarking.js
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<a class="source" href="raphaelcontext.html">
raphaelcontext.js
</a>
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<li>
<a class="source" href="registry.html">
registry.js
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<a class="source" href="renderer.html">
renderer.js
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<a class="source" href="repeatnote.html">
repeatnote.js
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<a class="source" href="smufl.html">
smufl.js
</a>
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<a class="source" href="stave.html">
stave.js
</a>
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<li>
<a class="source" href="stavebarline.html">
stavebarline.js
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<a class="source" href="staveconnector.html">
staveconnector.js
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<li>
<a class="source" href="stavehairpin.html">
stavehairpin.js
</a>
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<a class="source" href="staveline.html">
staveline.js
</a>
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<li>
<a class="source" href="stavemodifier.html">
stavemodifier.js
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<a class="source" href="stavenote.html">
stavenote.js
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<a class="source" href="staverepetition.html">
staverepetition.js
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<a class="source" href="stavesection.html">
stavesection.js
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<li>
<a class="source" href="stavetempo.html">
stavetempo.js
</a>
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<li>
<a class="source" href="stavetext.html">
stavetext.js
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<li>
<a class="source" href="stavetie.html">
stavetie.js
</a>
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<li>
<a class="source" href="stavevolta.html">
stavevolta.js
</a>
</li>
<li>
<a class="source" href="stem.html">
stem.js
</a>
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<li>
<a class="source" href="stemmablenote.html">
stemmablenote.js
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</li>
<li>
<a class="source" href="stringnumber.html">
stringnumber.js
</a>
</li>
<li>
<a class="source" href="strokes.html">
strokes.js
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<a class="source" href="svgcontext.html">
svgcontext.js
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<a class="source" href="system.html">
system.js
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<a class="source" href="tables.html">
tables.js
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<a class="source" href="tabnote.html">
tabnote.js
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<li>
<a class="source" href="tabslide.html">
tabslide.js
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<a class="source" href="tabstave.html">
tabstave.js
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</li>
<li>
<a class="source" href="tabtie.html">
tabtie.js
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</li>
<li>
<a class="source" href="textbracket.html">
textbracket.js
</a>
</li>
<li>
<a class="source" href="textdynamics.html">
textdynamics.js
</a>
</li>
<li>
<a class="source" href="textnote.html">
textnote.js
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</li>
<li>
<a class="source" href="tickable.html">
tickable.js
</a>
</li>
<li>
<a class="source" href="tickcontext.html">
tickcontext.js
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</li>
<li>
<a class="source" href="timesignature.html">
timesignature.js
</a>
</li>
<li>
<a class="source" href="timesignote.html">
timesignote.js
</a>
</li>
<li>
<a class="source" href="tremolo.html">
tremolo.js
</a>
</li>
<li>
<a class="source" href="tuning.html">
tuning.js
</a>
</li>
<li>
<a class="source" href="tuplet.html">
tuplet.js
</a>
</li>
<li>
<a class="source" href="vex.html">
vex.js
</a>
</li>
<li>
<a class="source" href="vibrato.html">
vibrato.js
</a>
</li>
<li>
<a class="source" href="vibratobracket.html">
vibratobracket.js
</a>
</li>
<li>
<a class="source" href="voice.html">
voice.js
</a>
</li>
<li>
<a class="source" href="voicegroup.html">
voicegroup.js
</a>
</li>
</ol>
</div>
</div>
<p><a href="http://vexflow.com">VexFlow</a> - Copyright (c) Mohit Muthanna 2010.</p>
<h2 id="description">Description</h2>
<p>This class implements vibratos.</p>
<div class='highlight'><pre>
<span class="hljs-keyword">import</span> { Vex } <span class="hljs-keyword">from</span> <span class="hljs-string">'./vex'</span>;
<span class="hljs-keyword">import</span> { Modifier } <span class="hljs-keyword">from</span> <span class="hljs-string">'./modifier'</span>;
<span class="hljs-keyword">import</span> { Bend } <span class="hljs-keyword">from</span> <span class="hljs-string">'./bend'</span>;
<span class="hljs-keyword">export</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Vibrato</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">Modifier</span> </span>{
<span class="hljs-keyword">static</span> get CATEGORY() { <span class="hljs-keyword">return</span> <span class="hljs-string">'vibratos'</span>; }</pre></div>
<h2 id="static-methods">Static Methods</h2>
<p>Arrange vibratos inside a <code>ModifierContext</code>.</p>
<div class='highlight'><pre> <span class="hljs-keyword">static</span> format(vibratos, state, context) {
<span class="hljs-keyword">if</span> (!vibratos || vibratos.length === <span class="hljs-number">0</span>) <span class="hljs-keyword">return</span> <span class="hljs-literal">false</span>;</pre></div>
<p>Vibratos are always on top.</p>
<div class='highlight'><pre> <span class="hljs-keyword">let</span> text_line = state.top_text_line;
<span class="hljs-keyword">let</span> width = <span class="hljs-number">0</span>;
<span class="hljs-keyword">let</span> shift = state.right_shift - <span class="hljs-number">7</span>;</pre></div>
<p>If there’s a bend, drop the text line</p>
<div class='highlight'><pre> <span class="hljs-keyword">const</span> bends = context.getModifiers(Bend.CATEGORY);
<span class="hljs-keyword">if</span> (bends && bends.length > <span class="hljs-number">0</span>) {
text_line--;
}</pre></div>
<p>Format Vibratos</p>
<div class='highlight'><pre> <span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> i = <span class="hljs-number">0</span>; i < vibratos.length; ++i) {
<span class="hljs-keyword">const</span> vibrato = vibratos[i];
vibrato.setXShift(shift);
vibrato.setTextLine(text_line);
width += vibrato.getWidth();
shift += width;
}
state.right_shift += width;
state.top_text_line += <span class="hljs-number">1</span>;
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
}</pre></div>
<h2 id="prototype-methods">Prototype Methods</h2>
<div class='highlight'><pre> <span class="hljs-keyword">constructor</span>() {
<span class="hljs-keyword">super</span>();
<span class="hljs-keyword">this</span>.setAttribute(<span class="hljs-string">'type'</span>, <span class="hljs-string">'Vibrato'</span>);
<span class="hljs-keyword">this</span>.position = Modifier.Position.RIGHT;
<span class="hljs-keyword">this</span>.render_options = {
<span class="hljs-attr">harsh</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">vibrato_width</span>: <span class="hljs-number">20</span>,
<span class="hljs-attr">wave_height</span>: <span class="hljs-number">6</span>,
<span class="hljs-attr">wave_width</span>: <span class="hljs-number">4</span>,
<span class="hljs-attr">wave_girth</span>: <span class="hljs-number">2</span>,
};
<span class="hljs-keyword">this</span>.setVibratoWidth(<span class="hljs-keyword">this</span>.render_options.vibrato_width);
}
getCategory() { <span class="hljs-keyword">return</span> Vibrato.CATEGORY; }
setHarsh(harsh) { <span class="hljs-keyword">this</span>.render_options.harsh = harsh; <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>; }
setVibratoWidth(width) {
<span class="hljs-keyword">this</span>.render_options.vibrato_width = width;
<span class="hljs-keyword">this</span>.setWidth(width);
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
}
draw() {
<span class="hljs-keyword">const</span> ctx = <span class="hljs-keyword">this</span>.checkContext();
<span class="hljs-keyword">if</span> (!<span class="hljs-keyword">this</span>.note) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> Vex.RERR(<span class="hljs-string">'NoNoteForVibrato'</span>, <span class="hljs-string">"Can't draw vibrato without an attached note."</span>);
}
<span class="hljs-keyword">this</span>.setRendered();
<span class="hljs-keyword">const</span> start = <span class="hljs-keyword">this</span>.note.getModifierStartXY(Modifier.Position.RIGHT, <span class="hljs-keyword">this</span>.index);
<span class="hljs-keyword">const</span> vx = start.x + <span class="hljs-keyword">this</span>.x_shift;
<span class="hljs-keyword">const</span> vy = <span class="hljs-keyword">this</span>.note.getYForTopText(<span class="hljs-keyword">this</span>.text_line) + <span class="hljs-number">2</span>;
Vibrato.renderVibrato(ctx, vx, vy, <span class="hljs-keyword">this</span>.render_options);
}</pre></div>
<p>Static rendering method that can be called from
other classes (e.g. VibratoBracket)</p>
<div class='highlight'><pre> <span class="hljs-keyword">static</span> renderVibrato(ctx, x, y, opts) {
<span class="hljs-keyword">const</span> { harsh, vibrato_width, wave_width, wave_girth, wave_height } = opts;
<span class="hljs-keyword">const</span> num_waves = vibrato_width / wave_width;
ctx.beginPath();
<span class="hljs-keyword">let</span> i;
<span class="hljs-keyword">if</span> (harsh) {
ctx.moveTo(x, y + wave_girth + <span class="hljs-number">1</span>);
<span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>; i < num_waves / <span class="hljs-number">2</span>; ++i) {
ctx.lineTo(x + wave_width, y - (wave_height / <span class="hljs-number">2</span>));
x += wave_width;
ctx.lineTo(x + wave_width, y + (wave_height / <span class="hljs-number">2</span>));
x += wave_width;
}
<span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>; i < num_waves / <span class="hljs-number">2</span>; ++i) {
ctx.lineTo(x - wave_width, (y - (wave_height / <span class="hljs-number">2</span>)) + wave_girth + <span class="hljs-number">1</span>);
x -= wave_width;
ctx.lineTo(x - wave_width, (y + (wave_height / <span class="hljs-number">2</span>)) + wave_girth + <span class="hljs-number">1</span>);
x -= wave_width;
}
ctx.fill();
} <span class="hljs-keyword">else</span> {
ctx.moveTo(x, y + wave_girth);
<span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>; i < num_waves / <span class="hljs-number">2</span>; ++i) {
ctx.quadraticCurveTo(x + (wave_width / <span class="hljs-number">2</span>), y - (wave_height / <span class="hljs-number">2</span>), x + wave_width, y);
x += wave_width;
ctx.quadraticCurveTo(x + (wave_width / <span class="hljs-number">2</span>), y + (wave_height / <span class="hljs-number">2</span>), x + wave_width, y);
x += wave_width;
}
<span class="hljs-keyword">for</span> (i = <span class="hljs-number">0</span>; i < num_waves / <span class="hljs-number">2</span>; ++i) {
ctx.quadraticCurveTo(
x - (wave_width / <span class="hljs-number">2</span>),
(y + (wave_height / <span class="hljs-number">2</span>)) + wave_girth,
x - wave_width, y + wave_girth);
x -= wave_width;
ctx.quadraticCurveTo(
x - (wave_width / <span class="hljs-number">2</span>),
(y - (wave_height / <span class="hljs-number">2</span>)) + wave_girth,
x - wave_width, y + wave_girth);
x -= wave_width;
}
ctx.fill();
}
}
}</pre></div>
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