mirror of
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19 lines
669 B
JavaScript
19 lines
669 B
JavaScript
export async function findConvexHull(pts){
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const {default:_}=await import('https://cdn.jsdelivr.net/npm/lodash-es@4.17.21/lodash.js');
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const p=_.orderBy(_.uniqWith(pts,(a,b)=>a.x===b.x&&a.y===b.y),['x','y']);
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if(p.length<3)return p;
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const c=(o,a,b)=>(a.x-o.x)*(b.y-o.y)-(a.y-o.y)*(b.x-o.x);
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const l=[],u=[];
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for(const v of p){
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while(l.length>1&&c(l[l.length-2],l[l.length-1],v)<=0)l.pop();
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l.push(v);
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}
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for(const v of [...p].reverse()){
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while(u.length>1&&c(u[u.length-2],u[u.length-1],v)<=0)u.pop();
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u.push(v);
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}
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return l.slice(0,-1).concat(u.slice(0,-1));
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}
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export default findConvexHull;
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// Generation time: 10.565s
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// Result: PASS
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