2024-06-25 02:37:57 +00:00
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<!DOCTYPE html>
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<html>
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<head>
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<style>
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body {
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background-color: #ffe0f0;
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}
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/* needed to keep Ganja canvas from blowing up */
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canvas {
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min-width: 600px;
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max-width: 600px;
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min-height: 600px;
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max-height: 600px;
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}
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</style>
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<script src="https://unpkg.com/ganja.js"></script>
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</head>
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<body>
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2024-06-25 10:11:50 +00:00
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<p><button onclick="flipPoint()">Flip point</button></p>
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2024-06-25 02:37:57 +00:00
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<script>
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2024-06-25 08:54:01 +00:00
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// in the default view, e4 + e5 is the point at infinity
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2024-06-25 09:07:39 +00:00
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let CGA3 = Algebra(4, 1);
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2024-06-25 10:11:50 +00:00
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let v = [
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CGA3.inline(() => 1e1 + 1e5)(),
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CGA3.inline(() => 1e2 + 1e5)(),
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CGA3.inline(() => 1e3 + 1e5)()
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];
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let w = [
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CGA3.inline(() => 1e1 - Math.sqrt(0.2)*1e4 + Math.sqrt(1.2)*1e5)(),
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CGA3.inline(() => 1e2 - Math.sqrt(0.2)*1e4 + Math.sqrt(1.2)*1e5)(),
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CGA3.inline(() => 1e3 - Math.sqrt(0.2)*1e4 + Math.sqrt(1.2)*1e5)()
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];
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2024-06-25 09:07:39 +00:00
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let s = CGA3.inline(() => -Math.sqrt(1.2)*1e4 + Math.sqrt(0.2)*1e5);
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2024-06-25 02:37:57 +00:00
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2024-06-25 10:11:50 +00:00
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// create scene function
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let scene = () => [
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0xff00b0, v[0],
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0x00ffb0, v[1],
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0x00b0ff, v[2],
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0x800040, w[0],
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0x008040, w[1],
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0x004080, w[2],
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0xd0e0f0, s
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];
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// initialize graph
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let gr = CGA3.graph(
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scene,
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2024-06-25 08:54:01 +00:00
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{
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conformal: true, gl: true, grid: true
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}
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2024-06-25 10:11:50 +00:00
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)
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document.body.appendChild(gr);
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function flipPoint() {
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v[0] = CGA3.Dual(CGA3.Mul(s, v[0]));
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requestAnimationFrame(gr.update.bind(gr, scene));
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}
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2024-06-25 02:37:57 +00:00
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</script>
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</body>
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</html>
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