2021-11-17 00:45:48 +00:00
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Domino Clock</title>
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<meta http-equiv="X-UI-Compatible" content="ie-edge" />
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<meta property="og:type" content="website" />
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<meta name="theme-color" content="#000000" />
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2021-11-18 00:02:46 +00:00
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<link rel="preconnect" href="https://fonts.googleapis.com" />
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
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<link href="https://fonts.googleapis.com/css2?family=Mulish&display=swap" rel="stylesheet" />
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<style>
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body {
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font-family: "Mulish", sans-serif;
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font-size: 16px;
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line-height: 1.36;
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2023-02-15 01:09:01 +00:00
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letter-spacing: 0.012em;
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padding: 1rem;
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2021-11-18 00:02:46 +00:00
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}
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p {
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color: #282828;
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max-width: 45ch;
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}
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</style>
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2021-11-17 00:45:48 +00:00
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</head>
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<body>
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2021-11-18 00:02:46 +00:00
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<h1>The Domino Clock</h1>
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<p>
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Sometime around 1996, when I was working for CompuServe, I saw a lovely demonstration of an
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electromechanical watch that used a sort of domino face to tell the time. I liked it so much that
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when I was looking for a toy project for my first Java Applet, I decided to implement the
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algorithm of the watch.
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</p>
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<p>
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2023-02-15 01:09:01 +00:00
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25 years later, I found the source code buried somewhere in an old
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CD. I decided to try an re-implement the logic in Javascript, and to
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experiment with a
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<a href="https://developer.mozilla.org/en-US/docs/Web/Web_Components">Web Component</a>,
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using the <a href="https://lit.dev">lit-html library</a>. This is the result.
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2021-11-18 00:02:46 +00:00
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</p>
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<p>
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It might seem a bit silly to have implemented the seconds face when the minutes face has a
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resolution of only five minutes, but it allows you to watch the clock in operation and learn what
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each symbol means: an empty face is 0 (12) and all four pips visible is 11 (or 55
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minutes/seconds).
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</p>
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<domino-clock></domino-clock>
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<p>
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The source code, both for this project and for the Java original,
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<a href="https://git.elfsternberg.com/elf/dominoclock"
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>are available at my personal Git repository</a
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>
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at <a href="https://elfsternberg.com">ElfSternberg.com</a>.
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</p>
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<script type="module" src="./src/index.ts"></script>
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2021-11-17 00:45:48 +00:00
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</body>
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</html>
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