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<section id="breakpoints-functions-py-multi-segments-envelopes">
<h1>05-breakpoints-functions.py - Multi-segments envelopes.<a class="headerlink" href="#breakpoints-functions-py-multi-segments-envelopes" title="Permalink to this heading">¶</a></h1>
<p>Linseg and Expseg objects draw a series of line segments between
specified break-points, either linear or exponential.</p>
<p>These objects wait for play() call to start reading the envelope.</p>
<p>They have methods to set loop mode, call pause/play without reset,
and replace the breakpoints.</p>
<p>One can use the graph() method to open a graphical display of the current
envelope, edit it, and copy the points (in the list format) to the
clipboard (Menu “File” of the graph display =&gt; “Copy all Points …”).
This makes it easier to explore and paste the result into the python
script when happy with the envelope!</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="kn">import</span> <span class="nn">random</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"># Randomly built 10-points amplitude envelope.</span>
<span class="n">t</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">points</span> <span class="o">=</span> <span class="p">[(</span><span class="mf">0.0</span><span class="p">,</span> <span class="mf">0.0</span><span class="p">),</span> <span class="p">(</span><span class="mf">2.0</span><span class="p">,</span> <span class="mf">0.0</span><span class="p">)]</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">8</span><span class="p">):</span>
    <span class="n">t</span> <span class="o">+=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.2</span><span class="p">)</span>
    <span class="n">v</span> <span class="o">=</span> <span class="n">random</span><span class="o">.</span><span class="n">uniform</span><span class="p">(</span><span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.9</span><span class="p">)</span>
    <span class="n">points</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">v</span><span class="p">))</span>

<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Expseg" title="pyo.lib.controls.Expseg"><span class="n">amp</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Expseg" title="pyo.lib.controls.Expseg"><span class="n">Expseg</span></a><span class="p">(</span><span class="n">points</span><span class="p">,</span> <span class="n">exp</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<span class="n">amp</span><span class="o">.</span><span class="n">graph</span><span class="p">(</span><span class="n">title</span><span class="o">=</span><span class="s2">"Amplitude envelope"</span><span class="p">)</span>

<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.RCOsc" title="pyo.lib.generators.RCOsc"><span class="n">sig</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.RCOsc" title="pyo.lib.generators.RCOsc"><span class="n">RCOsc</span></a><span class="p">(</span><span class="n">freq</span><span class="o">=</span><span class="p">[</span><span class="mi">150</span><span class="p">,</span> <span class="mi">151</span><span class="p">],</span> <span class="n">sharp</span><span class="o">=</span><span class="mf">0.85</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Expseg" title="pyo.lib.controls.Expseg"><span class="n">amp</span></a><span class="p">)</span>

<span class="c1"># A simple linear function to vary the amount of frequency shifting.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Linseg" title="pyo.lib.controls.Linseg"><span class="n">sft</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Linseg" title="pyo.lib.controls.Linseg"><span class="n">Linseg</span></a><span class="p">([(</span><span class="mf">0.0</span><span class="p">,</span> <span class="mf">0.0</span><span class="p">),</span> <span class="p">(</span><span class="mf">0.5</span><span class="p">,</span> <span class="mf">20.0</span><span class="p">),</span> <span class="p">(</span><span class="mi">2</span><span class="p">,</span> <span class="mf">0.0</span><span class="p">)])</span>
<span class="n">sft</span><span class="o">.</span><span class="n">graph</span><span class="p">(</span><span class="n">yrange</span><span class="o">=</span><span class="p">(</span><span class="mf">0.0</span><span class="p">,</span> <span class="mf">20.0</span><span class="p">),</span> <span class="n">title</span><span class="o">=</span><span class="s2">"Frequency shift"</span><span class="p">)</span>

<span class="n">fsg</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.FreqShift" title="pyo.lib.effects.FreqShift"><span class="n">FreqShift</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.RCOsc" title="pyo.lib.generators.RCOsc"><span class="n">sig</span></a><span class="p">,</span> <span class="n">shift</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/controls.html#pyo.Linseg" title="pyo.lib.controls.Linseg"><span class="n">sft</span></a><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>

<span class="n">rev</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/effects.html#pyo.WGVerb" title="pyo.lib.effects.WGVerb"><span class="n">WGVerb</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.RCOsc" title="pyo.lib.generators.RCOsc"><span class="n">sig</span></a> <span class="o">+</span> <span class="n">fsg</span><span class="p">,</span> <span class="n">feedback</span><span class="o">=</span><span class="mf">0.9</span><span class="p">,</span> <span class="n">cutoff</span><span class="o">=</span><span class="mi">3500</span><span class="p">,</span> <span class="n">bal</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span><span class="o">.</span><span class="n">out</span><span class="p">()</span>


<span class="k">def</span> <span class="nf">playnote</span><span class="p">():</span>
    <span class="s2">"Start the envelopes to play an event."</span>
    <span class="n">amp</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>
    <span class="n">sft</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>


<span class="c1"># Periodically call a function.</span>
<span class="n">pat</span> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/pattern.html#pyo.Pattern" title="pyo.lib.pattern.Pattern"><span class="n">Pattern</span></a><span class="p">(</span><span class="n">playnote</span><span class="p">,</span> <span class="mi">2</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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