TigerStable
19 lines
1.3 KiB
JavaScript
19 lines
1.3 KiB
JavaScript
'use strict';
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/* ═══════════════════════════════════════════════════════════
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1. HELPERS
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═══════════════════════════════════════════════════════════ */
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const H = {
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uid: () => Math.random().toString(36).slice(2,9) + Date.now().toString(36),
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esc: s => String(s||'').replace(/[&<>"']/g, c=>({'&':'&','<':'<','>':'>','"':'"',"'":'''}[c])),
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fmDist: m => m==null?'-': m>=1000? (m/1000).toFixed(2)+' km': Math.round(m).toLocaleString('id-ID')+' m',
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fmArea: m => m==null?'-': m>=10000? (m/10000).toFixed(4)+' ha': Math.round(m).toLocaleString('id-ID')+' m²',
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fmNum: n => (n||0).toLocaleString('id-ID'),
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today: () => new Date().toISOString().slice(0,10),
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geoLen: lls => { let t=0; for(let i=0;i<lls.length-1;i++) t+=lls[i].distanceTo(lls[i+1]); return Math.round(t); },
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geoArea: lls => {
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const R=6371008.8; let a=0,n=lls.length;
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for(let i=0;i<n;i++){const j=(i+1)%n,φ1=lls[i].lat*Math.PI/180,φ2=lls[j].lat*Math.PI/180,dλ=(lls[j].lng-lls[i].lng)*Math.PI/180;a+=dλ*(2+Math.sin(φ1)+Math.sin(φ2));}
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return Math.round(Math.abs(a*R*R/2));
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},
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};
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