vexflow
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A JavaScript library for rendering music notation and guitar tablature
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<h1>stavetempo.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.
Author Radosaw Eichler 2012</p>
<div class='highlight'><pre>
<span class="hljs-keyword">import</span> { Flow } <span class="hljs-keyword">from</span> <span class="hljs-string">'./tables'</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> { StaveModifier } <span class="hljs-keyword">from</span> <span class="hljs-string">'./stavemodifier'</span>;
<span class="hljs-keyword">import</span> { Glyph } <span class="hljs-keyword">from</span> <span class="hljs-string">'./glyph'</span>;
<span class="hljs-keyword">export</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">StaveTempo</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">StaveModifier</span> </span>{
<span class="hljs-keyword">static</span> get CATEGORY() { <span class="hljs-keyword">return</span> <span class="hljs-string">'stavetempo'</span>; }
<span class="hljs-keyword">constructor</span>(tempo, x, shift_y) {
<span class="hljs-keyword">super</span>();
<span class="hljs-keyword">this</span>.setAttribute(<span class="hljs-string">'type'</span>, <span class="hljs-string">'StaveTempo'</span>);
<span class="hljs-keyword">this</span>.tempo = tempo;
<span class="hljs-keyword">this</span>.position = Modifier.Position.ABOVE;
<span class="hljs-keyword">this</span>.x = x;
<span class="hljs-keyword">this</span>.shift_x = <span class="hljs-number">10</span>;
<span class="hljs-keyword">this</span>.shift_y = shift_y;
<span class="hljs-keyword">this</span>.font = {
<span class="hljs-attr">family</span>: <span class="hljs-string">'times'</span>,
<span class="hljs-attr">size</span>: <span class="hljs-number">14</span>,
<span class="hljs-attr">weight</span>: <span class="hljs-string">'bold'</span>,
};
<span class="hljs-keyword">this</span>.render_options = {
<span class="hljs-attr">glyph_font_scale</span>: <span class="hljs-number">30</span>, <span class="hljs-comment">// font size for note</span>
};
}
getCategory() { <span class="hljs-keyword">return</span> StaveTempo.CATEGORY; }
setTempo(tempo) { <span class="hljs-keyword">this</span>.tempo = tempo; <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>; }
setShiftX(x) { <span class="hljs-keyword">this</span>.shift_x = x; <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>; }
setShiftY(y) { <span class="hljs-keyword">this</span>.shift_y = y; <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>; }
draw(stave, shift_x) {
<span class="hljs-keyword">const</span> ctx = stave.checkContext();
<span class="hljs-keyword">this</span>.setRendered();
<span class="hljs-keyword">const</span> options = <span class="hljs-keyword">this</span>.render_options;</pre></div>
<p>FIXME: What does the ‘38’ mean? Why 38? Is that supposed to
be the default font size for standard notation?</p>
<div class='highlight'><pre> <span class="hljs-keyword">const</span> scale = options.glyph_font_scale / <span class="hljs-number">38</span>;
<span class="hljs-keyword">const</span> name = <span class="hljs-keyword">this</span>.tempo.name;
<span class="hljs-keyword">const</span> duration = <span class="hljs-keyword">this</span>.tempo.duration;
<span class="hljs-keyword">const</span> dots = <span class="hljs-keyword">this</span>.tempo.dots;
<span class="hljs-keyword">const</span> bpm = <span class="hljs-keyword">this</span>.tempo.bpm;
<span class="hljs-keyword">const</span> font = <span class="hljs-keyword">this</span>.font;
<span class="hljs-keyword">let</span> x = <span class="hljs-keyword">this</span>.x + <span class="hljs-keyword">this</span>.shift_x + shift_x;
<span class="hljs-keyword">const</span> y = stave.getYForTopText(<span class="hljs-number">1</span>) + <span class="hljs-keyword">this</span>.shift_y;
ctx.save();
<span class="hljs-keyword">if</span> (name) {
ctx.setFont(font.family, font.size, font.weight);
ctx.fillText(name, x, y);
x += ctx.measureText(name).width;
}
<span class="hljs-keyword">if</span> (duration && bpm) {
ctx.setFont(font.family, font.size, <span class="hljs-string">'normal'</span>);
<span class="hljs-keyword">if</span> (name) {
x += ctx.measureText(<span class="hljs-string">' '</span>).width;
ctx.fillText(<span class="hljs-string">'('</span>, x, y);
x += ctx.measureText(<span class="hljs-string">'('</span>).width;
}
<span class="hljs-keyword">const</span> code = Flow.getGlyphProps(duration);
x += <span class="hljs-number">3</span> * scale;
Glyph.renderGlyph(ctx, x, y, options.glyph_font_scale, code.code_head);
x += code.getWidth() * scale;</pre></div>
<p>Draw stem and flags</p>
<div class='highlight'><pre> <span class="hljs-keyword">if</span> (code.stem) {
<span class="hljs-keyword">let</span> stem_height = <span class="hljs-number">30</span>;
<span class="hljs-keyword">if</span> (code.beam_count) stem_height += <span class="hljs-number">3</span> * (code.beam_count - <span class="hljs-number">1</span>);
stem_height *= scale;
<span class="hljs-keyword">const</span> y_top = y - stem_height;
ctx.fillRect(x - scale, y_top, scale, stem_height);
<span class="hljs-keyword">if</span> (code.flag) {
Glyph.renderGlyph(ctx, x, y_top, options.glyph_font_scale,
code.code_flag_upstem, { <span class="hljs-attr">category</span>: <span class="hljs-string">'flag.staveTempo'</span> });
<span class="hljs-keyword">if</span> (!dots) x += <span class="hljs-number">6</span> * scale;
}
}</pre></div>
<p>Draw dot</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 < dots; i++) {
x += <span class="hljs-number">6</span> * scale;
ctx.beginPath();
ctx.arc(x, y + <span class="hljs-number">2</span> * scale, <span class="hljs-number">2</span> * scale, <span class="hljs-number">0</span>, <span class="hljs-built_in">Math</span>.PI * <span class="hljs-number">2</span>, <span class="hljs-literal">false</span>);
ctx.fill();
}
ctx.fillText(<span class="hljs-string">' = '</span> + bpm + (name ? <span class="hljs-string">')'</span> : <span class="hljs-string">''</span>), x + <span class="hljs-number">3</span> * scale, y);
}
ctx.restore();
<span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>;
}
}</pre></div>
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