81 lines
2.1 KiB
HTML
81 lines
2.1 KiB
HTML
---
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title: Serpeński Gasket on Tektronix Terminal
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description: A simulation of a program that amazed 4 whole people at my high school in 1991
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type: bare
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---
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<!DOCTYPE html>
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<html>
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<head>
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<title>Tektronix Terminal</title>
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<link rel="preconnect" href="https://fonts.gstatic.com">
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<link href="https://fonts.googleapis.com/css2?family=VT323&display=swap" rel="stylesheet">
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<style>
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html,
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body {
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background: black;
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color: white;
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width: 100%;
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height: 100%;
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margin: 0;
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}
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#credit {
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position: fixed;
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top: 20px;
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left: 20px;
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color: goldenrod;
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font-family: VT323, monospace;
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font-size: 22px;
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}
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</style>
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<script>
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lastPoint = [0, 0]
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points = [[0, 0], [0, 0], [0, 0]]
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interval = null
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function choose(arr) {
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return arr[Math.floor(Math.random() * arr.length)]
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}
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function midpoint(a, b) {
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return [(a[0] + b[0]) / 2, (a[1] + b[1]) / 2]
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}
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function drawPoint() {
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lastPoint = midpoint(choose(points), lastPoint)
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ctx.fillRect(lastPoint[0], lastPoint[1], 2, 2)
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}
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function go() {
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canvas = document.querySelector("canvas")
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ctx = canvas.getContext("2d")
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canvas.width = innerWidth
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canvas.height = innerHeight
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ctx.fillStyle = "goldenrod"
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lastPoint = [
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Math.random() * canvas.width,
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Math.random() * canvas.height,
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]
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points = [
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[canvas.width / 2, 0],
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[canvas.width, canvas.height],
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[0, canvas.height],
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]
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if (!interval) {
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interval = setInterval(drawPoint, 40)
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}
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}
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addEventListener("load", go)
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addEventListener("resize", go)
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</script>
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</head>
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<body>
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<canvas></canvas>
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<div id="credit">The Serpenski Gasket<br>1991 by Neale Pickett</div>
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</body>
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</html>
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