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<section id="function-calls-py-using-custom-algorithms-with-python-function-calls">
<h1>08-function-calls.py - Using custom algorithms with python function calls.<a class="headerlink" href="#function-calls-py-using-custom-algorithms-with-python-function-calls" title="Permalink to this heading">¶</a></h1>
<p><strong>EventCall</strong></p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">EventCall</span><span class="p">(</span><span class="n">function</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="n">occurrences</span><span class="o">=</span><span class="n">inf</span><span class="p">,</span> <span class="n">stopEventsWhenDone</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
</pre></div>
</div>
<p>EventCall calls a function, with any number of arguments (*args) and uses
its return value for the given parameter. The example below use a function
from the random module, <em>randrange</em>, with arguments and a user-defined
function, without argument, to create a rising, then falling, amplitude curve.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">random</span>
<span class="kn">from</span> <a class="sphinx-codeautolink-a" href="../../api/alphabetical.html#module-pyo" title="pyo"><span class="nn">pyo</span></a> <span class="kn">import</span> <span class="o">*</span>
<span class="n">s</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/server.html#pyo.Server" title="pyo.lib.server.Server"><span class="n">Server</span></a><span class="p">()</span><span class="o">.</span><span class="n">boot</span><span class="p">()</span>
<span class="n">db</span> <span class="o">=</span> <span class="o">-</span><span class="mi">30</span>
<span class="nb">dir</span> <span class="o">=</span> <span class="mi">1</span>
<span class="k">def</span> <span class="nf">riseFallAmp</span><span class="p">():</span>
<span class="s2">"Rises and falls amplitude between -30 and -3 dB, 1 db at the time."</span>
<span class="k">global</span> <span class="n">db</span><span class="p">,</span> <span class="nb">dir</span>
<span class="n">db</span> <span class="o">+=</span> <span class="nb">dir</span>
<span class="k">if</span> <span class="n">db</span> <span class="o">>=</span> <span class="o">-</span><span class="mi">3</span><span class="p">:</span>
<span class="nb">dir</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
<span class="k">elif</span> <span class="n">db</span> <span class="o"><</span> <span class="o">-</span><span class="mi">30</span><span class="p">:</span>
<span class="nb">dir</span> <span class="o">=</span> <span class="mi">1</span>
<span class="k">return</span> <span class="n">db</span>
<span class="c1"># Midi notes are chosen randomly with a function from the random module,</span>
<span class="c1"># while the amplitude change according to the riseFallAmp function's output.</span>
<span class="n">e</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.Events" title="pyo.lib.events.Events"><span class="n">Events</span></a><span class="p">(</span>
<span class="n">midinote</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventCall" title="pyo.lib.events.EventCall"><span class="n">EventCall</span></a><span class="p">(</span><span class="n">random</span><span class="o">.</span><span class="n">randrange</span><span class="p">,</span> <span class="mi">48</span><span class="p">,</span> <span class="mi">72</span><span class="p">,</span> <span class="mi">3</span><span class="p">),</span>
<span class="n">beat</span><span class="o">=</span><span class="mi">1</span> <span class="o">/</span> <span class="mf">4.0</span><span class="p">,</span>
<span class="n">db</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventCall" title="pyo.lib.events.EventCall"><span class="n">EventCall</span></a><span class="p">(</span><span class="n">riseFallAmp</span><span class="p">),</span>
<span class="n">attack</span><span class="o">=</span><span class="mf">0.001</span><span class="p">,</span>
<span class="n">decay</span><span class="o">=</span><span class="mf">0.05</span><span class="p">,</span>
<span class="n">sustain</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span>
<span class="n">release</span><span class="o">=</span><span class="mf">0.005</span><span class="p">,</span>
<span class="p">)</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>
<span class="n">s</span><span class="o">.</span><span class="n">gui</span><span class="p">(</span><span class="nb">locals</span><span class="p">())</span>
</pre></div>
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