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<div class="refentry" title="setctrl">
<a id="setctrl"></a>
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<a id="IndexSetctrl" class="indexterm"></a>
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<h2>
<span class="refentrytitle">setctrl</span>
</h2>
<p>setctrl —
Configurable slider controls for realtime user input.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp42170568"></a>
<h2>Description</h2>
<p>
Configurable slider controls for realtime user input. Requires Winsound or TCL/TK. <span class="emphasis"><em>setctrl</em></span> sets a slider to a specific value, or sets a minimum or maximum range.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp42173944"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>setctrl</strong></span> inum, ival, itype</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp42174976"></a>
<h2>Initialization</h2>
<p>
Note that this opcode is not available on Windows due to the implimentation of pipes on that system
</p>
<p>
<span class="emphasis"><em>inum</em></span> -- number of the slider to set
</p>
<p>
<span class="emphasis"><em>ival</em></span> -- value to be sent to the slider
</p>
<p>
<span class="emphasis"><em>itype</em></span> -- type of value sent to the slider as follows:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p>1 -- set the current value. Initial value is 0.</p>
</li>
<li class="listitem">
<p>2 -- set the minimum value. Default is 0.</p>
</li>
<li class="listitem">
<p>3 -- set the maximum value. Default is 127.</p>
</li>
<li class="listitem">
<p>4 -- set the label. (New in Csound version 4.09)</p>
</li>
</ul>
</div>
<p>
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp42230304"></a>
<h2>Performance</h2>
<p>
Calling <span class="emphasis"><em>setctrl</em></span> will create a new slider on the screen. There is no theoretical limit to the number of sliders. Windows and TCL/TK use only integers for slider values, so the values may need rescaling. GUIs usually pass values at a fairly slow rate, so it may be advisable to pass the output of control through <span class="emphasis"><em>port</em></span>.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp42231680"></a>
<h2>Examples</h2>
<p>
Here is an example of the setctrl opcode. It uses the file <a class="ulink" href="examples/setctrl.csd" target="_top"><em class="citetitle">setctrl.csd</em></a>.
</p>
<div class="example">
<a id="idp42232664"></a>
<p class="title">
<strong>Example 759. Example of the setctrl 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>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o setctrl.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
<span class="comment">; Display the label "Volume" on Slider #1.</span>
<span class="opc">setctrl</span> 1, "Volume", 4
<span class="comment">; Set Slider #1's initial value to 20.</span>
<span class="opc">setctrl</span> 1, 20, 1
<span class="comment">; Capture and display the values for Slider #1.</span>
k1 <span class="opc">control</span> 1
<span class="opc">printk2</span> k1
<span class="comment">; Play a simple oscillator.</span>
<span class="comment">; Use the values from Slider #1 for amplitude.</span>
kamp <span class="op">=</span> k1 <span class="op">*</span> 128
a1 <span class="opc">oscil</span> kamp, 440, 1
<span class="opc">out</span> a1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Table #1, a sine wave.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="comment">; Play Instrument #1 for thirty seconds.</span>
<span class="stamnt">i</span> 1 0 30
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
Its output should include lines like this:
</p>
<pre class="screen">
i1 38.00000
i1 40.00000
i1 43.00000
</pre>
<p>
</p>
</div>
<div class="refsect1" title="See Also">
<a id="idp42235424"></a>
<h2>See Also</h2>
<p>
<a class="link" href="control.html" title="control"><em class="citetitle">control</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp42236496"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
</tr>
<tr>
<td>University of Bath, Codemist. Ltd.</td>
</tr>
<tr>
<td>Bath, UK</td>
</tr>
<tr>
<td>May 2000</td>
</tr>
</table>
<p>
</p>
<p>Example written by Kevin Conder.</p>
<p>New in Csound version 4.06</p>
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