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<section id="arithmetic-ops-py-using-arithmetic-with-event-generators">
<h1>10-arithmetic-ops.py - Using arithmetic with event generators.<a class="headerlink" href="#arithmetic-ops-py-using-arithmetic-with-event-generators" title="Permalink to this heading">¶</a></h1>
<p>Arithmetic operators can be used with EventGenerator objects to control
their behaviour (and change the pattern of the sequence of values).</p>
<p>Available operators are:</p>
<p><cite>+</cite> : addition</p>
<p><cite>-</cite> : substraction</p>
<p><cite>*</cite> : multiplication</p>
<p><cite>/</cite> : division</p>
<p><cite>**</cite>: exponent</p>
<p><cite>%</cite> : modulo (remaining of the division)</p>
<p><cite>//</cite>: quantizer (returns te nearest multiple of its argument)</p>
<p>Arithmetic can be done with event generators as both operand and operator.</p>
<div class="highlight-python notranslate"><div class="highlight"><pre><span></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="c1"># Half-semitone scale (the octave is divided in 24 equally-spaced steps).</span>
<span class="c1"># The integer (a semitone in midi note) is divided by 2, which mean that</span>
<span class="c1"># there are two values inside a single integer.</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.EventDrunk" title="pyo.lib.events.EventDrunk"><span class="n">EventDrunk</span></a><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">48</span><span class="p">)),</span> <span class="n">maxStep</span><span class="o">=-</span><span class="mi">2</span><span class="p">)</span> <span class="o">/</span> <span class="mf">2.0</span> <span class="o">+</span> <span class="mi">72</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><span class="mi">12</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="c1"># Quantize to multiples of a minor third.</span>
<span class="n">e2</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">uniform</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span> <span class="mi">72</span><span class="p">)</span> <span class="o">//</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><span class="mi">12</span><span class="p">,</span>
    <span class="n">durmul</span><span class="o">=</span><span class="mi">1</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="c1"># EventGenerator as arithmetic operator. Kind of ostinato.</span>
<span class="n">e3</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.EventSeq" title="pyo.lib.events.EventSeq"><span class="n">EventSeq</span></a><span class="p">([</span><span class="mi">48</span><span class="p">,</span> <span class="mi">50</span><span class="p">,</span> <span class="mi">52</span><span class="p">])</span> <span class="o">-</span> <a class="sphinx-codeautolink-a" href="../../api/classes/events.html#pyo.EventSeq" title="pyo.lib.events.EventSeq"><span class="n">EventSeq</span></a><span class="p">([</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">6</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><span class="mi">12</span><span class="p">,</span>
    <span class="n">durmul</span><span class="o">=</span><span class="mi">1</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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