vexflow
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A JavaScript library for rendering music notation and guitar tablature
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<title>tabslide.js</title>
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<h1>tabslide.js</h1>
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<h3>Table of Contents</h3>
<ol>
<li>
<a class="source" href="accidental.html">
accidental.js
</a>
</li>
<li>
<a class="source" href="annotation.html">
annotation.js
</a>
</li>
<li>
<a class="source" href="articulation.html">
articulation.js
</a>
</li>
<li>
<a class="source" href="barnote.html">
barnote.js
</a>
</li>
<li>
<a class="source" href="beam.html">
beam.js
</a>
</li>
<li>
<a class="source" href="bend.html">
bend.js
</a>
</li>
<li>
<a class="source" href="boundingbox.html">
boundingbox.js
</a>
</li>
<li>
<a class="source" href="boundingboxcomputation.html">
boundingboxcomputation.js
</a>
</li>
<li>
<a class="source" href="canvascontext.html">
canvascontext.js
</a>
</li>
<li>
<a class="source" href="clef.html">
clef.js
</a>
</li>
<li>
<a class="source" href="clefnote.html">
clefnote.js
</a>
</li>
<li>
<a class="source" href="crescendo.html">
crescendo.js
</a>
</li>
<li>
<a class="source" href="curve.html">
curve.js
</a>
</li>
<li>
<a class="source" href="dot.html">
dot.js
</a>
</li>
<li>
<a class="source" href="easyscore.html">
easyscore.js
</a>
</li>
<li>
<a class="source" href="element.html">
element.js
</a>
</li>
<li>
<a class="source" href="factory.html">
factory.js
</a>
</li>
<li>
<a class="source" href="formatter.html">
formatter.js
</a>
</li>
<li>
<a class="source" href="fraction.html">
fraction.js
</a>
</li>
<li>
<a class="source" href="frethandfinger.html">
frethandfinger.js
</a>
</li>
<li>
<a class="source" href="ghostnote.html">
ghostnote.js
</a>
</li>
<li>
<a class="source" href="glyph.html">
glyph.js
</a>
</li>
<li>
<a class="source" href="glyphnote.html">
glyphnote.js
</a>
</li>
<li>
<a class="source" href="gracenote.html">
gracenote.js
</a>
</li>
<li>
<a class="source" href="gracenotegroup.html">
gracenotegroup.js
</a>
</li>
<li>
<a class="source" href="gracetabnote.html">
gracetabnote.js
</a>
</li>
<li>
<a class="source" href="index.html">
index.js
</a>
</li>
<li>
<a class="source" href="keymanager.html">
keymanager.js
</a>
</li>
<li>
<a class="source" href="keysignature.html">
keysignature.js
</a>
</li>
<li>
<a class="source" href="keysignote.html">
keysignote.js
</a>
</li>
<li>
<a class="source" href="modifier.html">
modifier.js
</a>
</li>
<li>
<a class="source" href="modifiercontext.html">
modifiercontext.js
</a>
</li>
<li>
<a class="source" href="multimeasurerest.html">
multimeasurerest.js
</a>
</li>
<li>
<a class="source" href="music.html">
music.js
</a>
</li>
<li>
<a class="source" href="note.html">
note.js
</a>
</li>
<li>
<a class="source" href="notehead.html">
notehead.js
</a>
</li>
<li>
<a class="source" href="notesubgroup.html">
notesubgroup.js
</a>
</li>
<li>
<a class="source" href="ornament.html">
ornament.js
</a>
</li>
<li>
<a class="source" href="parser.html">
parser.js
</a>
</li>
<li>
<a class="source" href="pedalmarking.html">
pedalmarking.js
</a>
</li>
<li>
<a class="source" href="raphaelcontext.html">
raphaelcontext.js
</a>
</li>
<li>
<a class="source" href="registry.html">
registry.js
</a>
</li>
<li>
<a class="source" href="renderer.html">
renderer.js
</a>
</li>
<li>
<a class="source" href="repeatnote.html">
repeatnote.js
</a>
</li>
<li>
<a class="source" href="smufl.html">
smufl.js
</a>
</li>
<li>
<a class="source" href="stave.html">
stave.js
</a>
</li>
<li>
<a class="source" href="stavebarline.html">
stavebarline.js
</a>
</li>
<li>
<a class="source" href="staveconnector.html">
staveconnector.js
</a>
</li>
<li>
<a class="source" href="stavehairpin.html">
stavehairpin.js
</a>
</li>
<li>
<a class="source" href="staveline.html">
staveline.js
</a>
</li>
<li>
<a class="source" href="stavemodifier.html">
stavemodifier.js
</a>
</li>
<li>
<a class="source" href="stavenote.html">
stavenote.js
</a>
</li>
<li>
<a class="source" href="staverepetition.html">
staverepetition.js
</a>
</li>
<li>
<a class="source" href="stavesection.html">
stavesection.js
</a>
</li>
<li>
<a class="source" href="stavetempo.html">
stavetempo.js
</a>
</li>
<li>
<a class="source" href="stavetext.html">
stavetext.js
</a>
</li>
<li>
<a class="source" href="stavetie.html">
stavetie.js
</a>
</li>
<li>
<a class="source" href="stavevolta.html">
stavevolta.js
</a>
</li>
<li>
<a class="source" href="stem.html">
stem.js
</a>
</li>
<li>
<a class="source" href="stemmablenote.html">
stemmablenote.js
</a>
</li>
<li>
<a class="source" href="stringnumber.html">
stringnumber.js
</a>
</li>
<li>
<a class="source" href="strokes.html">
strokes.js
</a>
</li>
<li>
<a class="source" href="svgcontext.html">
svgcontext.js
</a>
</li>
<li>
<a class="source" href="system.html">
system.js
</a>
</li>
<li>
<a class="source" href="tables.html">
tables.js
</a>
</li>
<li>
<a class="source" href="tabnote.html">
tabnote.js
</a>
</li>
<li>
<a class="source" href="tabslide.html">
tabslide.js
</a>
</li>
<li>
<a class="source" href="tabstave.html">
tabstave.js
</a>
</li>
<li>
<a class="source" href="tabtie.html">
tabtie.js
</a>
</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
</a>
</li>
<li>
<a class="source" href="tickable.html">
tickable.js
</a>
</li>
<li>
<a class="source" href="tickcontext.html">
tickcontext.js
</a>
</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 varies types of ties between contiguous notes. The
ties include: regular ties, hammer ons, pull offs, and slides.</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> { TabTie } <span class="hljs-keyword">from</span> <span class="hljs-string">'./tabtie'</span>;
<span class="hljs-keyword">export</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">TabSlide</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">TabTie</span> </span>{
<span class="hljs-keyword">static</span> get SLIDE_UP() {
<span class="hljs-keyword">return</span> <span class="hljs-number">1</span>;
}
<span class="hljs-keyword">static</span> get SLIDE_DOWN() {
<span class="hljs-keyword">return</span> <span class="hljs-number">-1</span>;
}
<span class="hljs-keyword">static</span> createSlideUp(notes) {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> TabSlide(notes, TabSlide.SLIDE_UP);
}
<span class="hljs-keyword">static</span> createSlideDown(notes) {
<span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> TabSlide(notes, TabSlide.SLIDE_DOWN);
}
<span class="hljs-keyword">constructor</span>(notes, direction) {
<span class="hljs-comment">/**
* Notes is a struct that has:
*
* {
* first_note: Note,
* last_note: Note,
* first_indices: [n1, n2, n3],
* last_indices: [n1, n2, n3]
* }
*
**/</span>
<span class="hljs-keyword">super</span>(notes, <span class="hljs-string">'sl.'</span>);
<span class="hljs-keyword">this</span>.setAttribute(<span class="hljs-string">'type'</span>, <span class="hljs-string">'TabSlide'</span>);
<span class="hljs-keyword">if</span> (!direction) {
<span class="hljs-keyword">const</span> first_fret = notes.first_note.getPositions()[<span class="hljs-number">0</span>].fret;
<span class="hljs-keyword">const</span> last_fret = notes.last_note.getPositions()[<span class="hljs-number">0</span>].fret;
direction = ((<span class="hljs-built_in">parseInt</span>(first_fret, <span class="hljs-number">10</span>) > <span class="hljs-built_in">parseInt</span>(last_fret, <span class="hljs-number">10</span>)) ?
TabSlide.SLIDE_DOWN : TabSlide.SLIDE_UP);
}
<span class="hljs-keyword">this</span>.slide_direction = direction;
<span class="hljs-keyword">this</span>.render_options.cp1 = <span class="hljs-number">11</span>;
<span class="hljs-keyword">this</span>.render_options.cp2 = <span class="hljs-number">14</span>;
<span class="hljs-keyword">this</span>.render_options.y_shift = <span class="hljs-number">0.5</span>;
<span class="hljs-keyword">this</span>.setFont({ <span class="hljs-attr">font</span>: <span class="hljs-string">'Times'</span>, <span class="hljs-attr">size</span>: <span class="hljs-number">10</span>, <span class="hljs-attr">style</span>: <span class="hljs-string">'bold italic'</span> });
<span class="hljs-keyword">this</span>.setNotes(notes);
}
renderTie(params) {
<span class="hljs-keyword">if</span> (params.first_ys.length === <span class="hljs-number">0</span> || params.last_ys.length === <span class="hljs-number">0</span>) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> Vex.RERR(<span class="hljs-string">'BadArguments'</span>, <span class="hljs-string">'No Y-values to render'</span>);
}
<span class="hljs-keyword">const</span> ctx = <span class="hljs-keyword">this</span>.context;
<span class="hljs-keyword">const</span> first_x_px = params.first_x_px;
<span class="hljs-keyword">const</span> first_ys = params.first_ys;
<span class="hljs-keyword">const</span> last_x_px = params.last_x_px;
<span class="hljs-keyword">const</span> direction = <span class="hljs-keyword">this</span>.slide_direction;
<span class="hljs-keyword">if</span> (direction !== TabSlide.SLIDE_UP && direction !== TabSlide.SLIDE_DOWN) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> Vex.RERR(<span class="hljs-string">'BadSlide'</span>, <span class="hljs-string">'Invalid slide direction'</span>);
}
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> i = <span class="hljs-number">0</span>; i < <span class="hljs-keyword">this</span>.first_indices.length; ++i) {
<span class="hljs-keyword">const</span> slide_y = first_ys[<span class="hljs-keyword">this</span>.first_indices[i]] +
<span class="hljs-keyword">this</span>.render_options.y_shift;
<span class="hljs-keyword">if</span> (<span class="hljs-built_in">isNaN</span>(slide_y)) {
<span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> Vex.RERR(<span class="hljs-string">'BadArguments'</span>, <span class="hljs-string">'Bad indices for slide rendering.'</span>);
}
ctx.beginPath();
ctx.moveTo(first_x_px, slide_y + (<span class="hljs-number">3</span> * direction));
ctx.lineTo(last_x_px, slide_y - (<span class="hljs-number">3</span> * direction));
ctx.closePath();
ctx.stroke();
}
<span class="hljs-keyword">this</span>.setRendered();
}
}</pre></div>
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