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23 lines
771 B
JavaScript
23 lines
771 B
JavaScript
async function findConvexHull(p) {
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const { default: _ } = await import('https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js'),
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u = _.uniqWith(_.sortBy(p, 'x', 'y'), (a, b) => a.x === b.x && a.y === b.y);
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if (u.length < 3) return u;
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const cross = (o, a, b) => (a.x - o.x) * (b.y - o.y) - (a.y - o.y) * (b.x - o.x),
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build = (pts) => {
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const h = [];
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for (const q of pts) {
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while (h.length > 1 && cross(h[h.length - 2], h[h.length - 1], q) <= 0) h.pop();
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h.push(q);
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}
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return h;
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};
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const l = build(u),
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r = build([...u].reverse());
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return [...l.slice(0, -1), ...r.slice(0, -1)];
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}
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export default findConvexHull;
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// Generation time: 147.393s
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// Result: FAIL
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