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<h2>
<span class="refentrytitle">display</span>
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<p>display —
Displays the audio or control signals as an amplitude vs. time graph.
</p>
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<div class="refsect1" title="Description">
<a id="idp18428880"></a>
<h2>Description</h2>
<p>
These units will print orchestra init-values, or produce graphic display of orchestra control signals and audio signals. Uses X11 windows if enabled, else (or if <a class="link" href="CommandFlags.html#FlagsMinusLowerG"><em class="citetitle">-g</em></a> flag is set) displays are approximated in ASCII characters.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp18439520"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>display</strong></span> xsig, iprd [, inprds] [, iwtflg]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp18440552"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iprd</em></span> -- the period of display in seconds.
</p>
<p>
<span class="emphasis"><em>inprds</em></span> (optional, default=1) -- Number of display periods retained in each display graph. A value of 2 or more will provide a larger perspective of the signal motion. The default value is 1 (each graph completely new).
<span class="emphasis"><em>inprds</em></span> is a scaling factor for the displayed waveform, controlling how many <span class="emphasis"><em>iprd</em></span>-sized frames of samples are drawn in the window (the default and minimum value is 1.0). Higher <span class="emphasis"><em>inprds</em></span> values are slower to draw (more points to draw) but will show the waveform scrolling through the window, which is useful with low <span class="emphasis"><em>iprd</em></span> values.
</p>
<p>
<span class="emphasis"><em>iwtflg</em></span> (optional, default=0) -- wait flag. If non-zero, each display is held until released by the user. The default value is 0 (no wait).
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp18443704"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>display</em></span> -- displays the audio or control signal <span class="emphasis"><em>xsig</em></span> every <span class="emphasis"><em>iprd</em></span> seconds, as an amplitude vs. time graph.
</p>
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<div class="refsect1" title="Examples">
<a id="idp18481056"></a>
<h2>Examples</h2>
<p>
Here is an example of the display opcode. It uses the file <a class="ulink" href="examples/display.csd" target="_top"><em class="citetitle">display.csd</em></a>.
</p>
<div class="example">
<a id="idp18482000"></a>
<p class="title">
<strong>Example 181. Example of the display 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>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o display.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
kcps <span class="op">=</span> 110
ifn <span class="op">=</span> 1
knh <span class="opc">line</span> p4, p3, p5
asig <span class="opc">buzz</span> 1, kcps, knh, ifn
<span class="opc">outs</span> asig, asig
<span class="opc">display</span> asig, .1, 3
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">;sine wave.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="stamnt">i</span> 1 0 3 20 20
<span class="stamnt">i</span> 1 + 3 3 3
<span class="stamnt">i</span> 1 + 3 150 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp18484280"></a>
<h2>See Also</h2>
<p>
<a class="link" href="dispfft.html" title="dispfft"><em class="citetitle">dispfft</em></a>,
<a class="link" href="print.html" title="print"><em class="citetitle">print</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp18485776"></a>
<h2>Credits</h2>
<p>Comments about the <span class="emphasis"><em>inprds</em></span> parameter contributed by Rasmus Ekman.</p>
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