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<h2>
<span class="refentrytitle">line</span>
</h2>
<p>line —
Trace a straight line between specified points.
</p>
</div>
<div class="refsect1">
<a id="idm281472920982424"></a>
<h2>Description</h2>
<p>
Trace a straight line between specified points.
</p>
</div>
<div class="refsect1">
<a id="idm281472920981080"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>line</strong></span> ia, idur, ib</pre>
<pre class="synopsis">kres <span class="command"><strong>line</strong></span> ia, idur, ib</pre>
</div>
<div class="refsect1">
<a id="idm281472920916936"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ia</em></span> -- starting value.
</p>
<p>
<span class="emphasis"><em>ib</em></span> -- value after <span class="emphasis"><em>idur</em></span> seconds.
</p>
<p>
<span class="emphasis"><em>idur</em></span> -- duration in seconds of segment. A zero or negative value will cause all initialization to be skipped.
</p>
</div>
<div class="refsect1">
<a id="idm281472920912904"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>line</em></span> generates control or audio signals whose values move linearly from an initial value to a final one.
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
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<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
A common error with this opcode is to assume that the value of
<span class="emphasis"><em>ib</em></span> is held after the time
<span class="emphasis"><em>idur1</em></span>. <span class="emphasis"><em>line</em></span> does not
automatically end or stop at the end of the duration given. If your
note length is longer than <span class="emphasis"><em>idur</em></span> seconds,
<span class="emphasis"><em>kres</em></span> (or <span class="emphasis"><em>ares</em></span>) will not come
to rest at <span class="emphasis"><em>ib</em></span>, but will instead continue to rise
or fall with the same rate. If a rise (or fall) and then hold is
required that the <span class="emphasis"><em>linseg</em></span> opcode should be
considered instead.
</p>
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<div class="refsect1">
<a id="idm281472920906056"></a>
<h2>Examples</h2>
<p>
Here is an example of the line opcode. It uses the file <a class="ulink" href="examples/line.csd" target="_top"><em class="citetitle">line.csd</em></a>.
</p>
<div class="example">
<a id="idm281472920904280"></a>
<p class="title">
<strong>Example 457. Example of the line opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<div class="refsect1">
<a id="idm281472748245352"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o line.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">p</span> <span class="o">=</span> <span class="nb">p6</span>
<span class="c1">;choose between expon or line</span>
<span class="k">if</span> <span class="p">(</span>k<span class="n">p</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="k">then</span>
k<span class="n">pitch</span> <span class="nb">expon</span> <span class="nb">p4</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="nb">p5</span>
<span class="k">elseif</span> <span class="p">(</span>k<span class="n">p</span> <span class="o">==</span> <span class="mi">1</span><span class="p">)</span> <span class="k">then</span>
k<span class="n">pitch</span> <span class="nb">line</span> <span class="nb">p4</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="nb">p5</span>
<span class="k">endif</span>
a<span class="n">sig</span> <span class="nb">vco2</span> <span class="mf">.6</span><span class="p">,</span> k<span class="n">pitch</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">2</span> <span class="mi">300</span> <span class="mi">600</span> <span class="mi">0</span> <span class="c1">;if p6=0 then expon is used</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">3</span> <span class="mi">2</span> <span class="mi">300</span> <span class="mi">600</span> <span class="mi">1</span> <span class="c1">;if p6=1 then line is used</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">6</span> <span class="mi">2</span> <span class="mi">600</span> <span class="mi">1200</span> <span class="mi">0</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">9</span> <span class="mi">2</span> <span class="mi">600</span> <span class="mi">1200</span> <span class="mi">1</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">12</span> <span class="mi">2</span> <span class="mi">1200</span> <span class="mi">2400</span> <span class="mi">0</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">15</span> <span class="mi">2</span> <span class="mi">1200</span> <span class="mi">2400</span> <span class="mi">1</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">18</span> <span class="mi">2</span> <span class="mi">2400</span> <span class="mi">30</span> <span class="mi">0</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">21</span> <span class="mi">2</span> <span class="mi">2400</span> <span class="mi">30</span> <span class="mi">1</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
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<p><br class="example-break" />
</p>
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<div class="refsect1">
<a id="idm281472920900088"></a>
<h2>See Also</h2>
<p>
<a class="link" href="expon.html" title="expon"><em class="citetitle">expon</em></a>,
<a class="link" href="expseg.html" title="expseg"><em class="citetitle">expseg</em></a>,
<a class="link" href="expsegr.html" title="expsegr"><em class="citetitle">expsegr</em></a>,
<a class="link" href="linseg.html" title="linseg"><em class="citetitle">linseg</em></a>,
<a class="link" href="linsegr.html" title="linsegr"><em class="citetitle">linsegr</em></a>
</p>
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<div class="refsect1">
<a id="idm281472920894136"></a>
<h2>Credits</h2>
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distrib
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Mageia
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7
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armv7hl
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media
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core-release
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by-pkgid
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5fcfcb7517038d1f44ab4e478e6e61fa
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2347
