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<section id="moving-points-py-periodically-rewrite-a-break-point-function-table">
<h1>07-moving-points.py - Periodically rewrite a break-point function table.<a class="headerlink" href="#moving-points-py-periodically-rewrite-a-break-point-function-table" title="Permalink to this heading">¶</a></h1>
<p>This example shows how we can dynamically modify a function table to create a
curve that varies over time.</p>
<p>Note: Rewriting a large table can produce xruns in the audio output. Usually,
for this kind of processes, we want to keep the table size relatively small.</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"># Initialize an empty table.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.LinTable" title="pyo.lib.tables.LinTable"><span class="n">table</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.LinTable" title="pyo.lib.tables.LinTable"><span class="n">LinTable</span></a><span class="p">([(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">),</span> <span class="p">(</span><span class="mi">255</span><span class="p">,</span> <span class="mi">0</span><span class="p">)],</span> <span class="n">size</span><span class="o">=</span><span class="mi">256</span><span class="p">)</span>
<span class="n">table</span><span class="o">.</span><span class="n">view</span><span class="p">()</span>

<span class="c1"># Two LFOs whose values will change the center points in the table.</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">lfo1</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">Sine</span></a><span class="p">(</span><span class="mf">0.1</span><span class="p">,</span> <span class="n">phase</span><span class="o">=</span><span class="mf">0.75</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">lfo2</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/generators.html#pyo.Sine" title="pyo.lib.generators.Sine"><span class="n">Sine</span></a><span class="p">(</span><span class="mf">0.15</span><span class="p">,</span> <span class="n">phase</span><span class="o">=</span><span class="mf">0.75</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">add</span><span class="o">=</span><span class="mf">0.5</span><span class="p">)</span>


<span class="k">def</span> <span class="nf">create_line</span><span class="p">():</span>
    <span class="s2">"Function to create a new line."</span>
    <span class="n">lst</span> <span class="o">=</span> <span class="p">[(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)]</span>  <span class="c1"># First point of the table at value 0.</span>
    <span class="n">lst</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="mi">8</span><span class="p">,</span> <span class="n">lfo1</span><span class="o">.</span><span class="n">get</span><span class="p">()))</span>  <span class="c1"># Second point, from first LFO.</span>
    <span class="n">lst</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="mi">128</span><span class="p">,</span> <span class="n">lfo2</span><span class="o">.</span><span class="n">get</span><span class="p">()))</span>  <span class="c1"># Third point, from second LFO.</span>
    <span class="n">lst</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="mi">255</span><span class="p">,</span> <span class="mi">0</span><span class="p">))</span>  <span class="c1"># Last point of the table at value 0.</span>

    <span class="c1"># Replace the table content with the new list of points.</span>
    <span class="n">table</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">lst</span><span class="p">)</span>


<span class="c1"># Call the function "create_line" every 50 ms.</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">function</span><span class="o">=</span><span class="n">create_line</span><span class="p">,</span> <span class="n">time</span><span class="o">=</span><span class="mf">0.05</span><span class="p">)</span><span class="o">.</span><span class="n">play</span><span class="p">()</span>

<span class="c1"># Little test case...</span>
<a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Osc" title="pyo.lib.tableprocess.Osc"><span class="n">amp</span></a> <span class="o">=</span> <a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Osc" title="pyo.lib.tableprocess.Osc"><span class="n">Osc</span></a><span class="p">(</span><a class="sphinx-codeautolink-a" href="../../api/classes/tables.html#pyo.LinTable" title="pyo.lib.tables.LinTable"><span class="n">table</span></a><span class="p">,</span> <span class="n">freq</span><span class="o">=</span><span class="mi">4</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><span class="mf">0.4</span><span class="p">)</span>
<span class="n">synth</span> <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="mf">99.5</span><span class="p">,</span> <span class="mi">100</span><span class="p">],</span> <span class="n">sharp</span><span class="o">=</span><span class="mf">0.3</span><span class="p">,</span> <span class="n">mul</span><span class="o">=</span><a class="sphinx-codeautolink-a" href="../../api/classes/tableprocess.html#pyo.Osc" title="pyo.lib.tableprocess.Osc"><span class="n">amp</span></a><span class="p">)</span><span class="o">.</span><span class="n">out</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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