Bluemi.github.io/fourier-showcase.html at main · Bluemi/Bluemi.github.io · GitHub

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<!doctype html>
<html lang="en">
<head>
  <script src="https://cdn.jsdelivr.net/pyodide/v0.23.4/full/pyodide.js"></script>
  <script src="js/pygameHelper.js"></script>
  <link rel="stylesheet" type="text/css" href="styles.css">
  <title>Fourier Showcase</title>
</head>
<body>
<div class="full-page-width">
  <canvas id="mainCanvas" oncontextmenu="return false;"></canvas>
</div>

<h1 id="fourier-showcase"><a href="https://github.com/Bluemi/fourier-showcase">Fourier Showcase</a></h1>
<p>A small utility program in Python (pygame + numpy) to visualize the fourier transformation, executed in browser using <a href="https://pyodide.org/en/stable/">pyodide</a>. </p>
<h2 id="tryitout">Try it out!</h2>
<p>The left side shows a list of float values.</p>
<p>The right side shows the resulting spectrum after a fourier transformation.</p>

<h3 id="changing-the-samples">Changing the samples/spectrum</h3>
<p>To change the spectrum just click on it and move the cursor around. Left click will set the real part, right click the imaginary part.</p>
<p>There are also some predefined spectrums that can be set by pressing the following keys:</p>
<ul>
<li><code>s</code>, <code>c</code>: Create a sin()/cos()-function on the left side. Pressing it again will incease the frequency. Pressing Shift+s reduces the frequency.</li>
<li><code>0</code>: Set all samples to zero.</li>
<li><code>+</code>, <code>-</code>: Increase/decrease the number of samples.</li>
<li><code>i</code>: Toggle rendering the imaginary part of the samples.</li>
</ul>

</body>
<script src="js/fourier_showcase.js"></script>
</html>