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<div class="refentry" title="wterrain">
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<h2>
<span class="refentrytitle">wterrain</span>
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<p>wterrain —
A simple wave-terrain synthesis opcode.
</p>
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<div class="refsect1" title="Description">
<a id="idp54187008"></a>
<h2>Description</h2>
<p>
A simple wave-terrain synthesis opcode.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp54187728"></a>
<h2>Syntax</h2>
<pre class="synopsis">aout <span class="command"><strong>wterrain</strong></span> kamp, kpch, k_xcenter, k_ycenter, k_xradius, k_yradius, \
itabx, itaby</pre>
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<div class="refsect1" title="Initialization">
<a id="idp54198352"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>itabx, itaby</em></span> -- The two tables that define the terrain.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp54199264"></a>
<h2>Performance</h2>
<p>
The output is the result of drawing an ellipse with axes <span class="emphasis"><em>k_xradius</em></span> and <span class="emphasis"><em>k_yradius</em></span> centered at (<span class="emphasis"><em>k_xcenter</em></span>, <span class="emphasis"><em>k_ycenter</em></span>), and traversing it at frequency <span class="emphasis"><em>kpch</em></span>.
</p>
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<div class="refsect1" title="Examples">
<a id="idp54233480"></a>
<h2>Examples</h2>
<p>
Here is an example of the wterrain opcode. It uses the file <a class="ulink" href="examples/wterrain.csd" target="_top"><em class="citetitle">wterrain.csd</em></a>.
</p>
<div class="example">
<a id="idp54234472"></a>
<p class="title">
<strong>Example 1000. Example of the wterrain 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 wterrain.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="oblock">instr</span> 1
kdclk <span class="opc">linseg</span> 0, 0.01, 1, p3<span class="op">-</span>0.02, 1, 0.01, 0
kcx <span class="opc">line</span> 0.1, p3, 1.9
krx <span class="opc">linseg</span> 0.1, p3<span class="op">/</span>2, 0.5, p3<span class="op">/</span>2, 0.1
kpch <span class="opc">line</span> <span class="opc">cpspch</span>(p4), p3, p5 <span class="op">*</span> <span class="opc">cpspch</span>(p4)
a1 <span class="opc">wterrain</span> 10000, kpch, kcx, kcx, <span class="op">-</span>krx, krx, p6, p7
a1 <span class="opc">dcblock</span> a1
<span class="opc">out</span> a1<span class="op">*</span>kdclk
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 8192 10 1 0 0.33 0 0.2 0 0.14 0 0.11
<span class="stamnt">f</span>2 0 4096 10 1
<span class="stamnt">i</span>1 0 4 7.00 1 1 1
<span class="stamnt">i</span>1 4 4 6.07 1 1 2
<span class="stamnt">i</span>1 8 8 6.00 1 2 2
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="Credits">
<a id="idp54236736"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Matthew Gillard</td>
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<td>New in version 4.19</td>
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