90 lines
3.0 KiB
HTML
90 lines
3.0 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<title>Honestly stolen from BlackSharkDen</title>
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<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
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<script src="https://unpkg.com/maplibre-gl@2.4.0/dist/maplibre-gl.js"></script>
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<link href="https://unpkg.com/maplibre-gl@2.4.0/dist/maplibre-gl.css" rel="stylesheet" />
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<style>
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body { margin: 0; padding: 0; }
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#map { position: absolute; top: 0; bottom: 0; width: 100%; }
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#info {
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display: block;
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position: relative;
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margin: 0px auto;
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width: 50%;
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padding: 10px;
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border: none;
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border-radius: 3px;
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font-size: 12px;
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text-align: center;
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color: #222;
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background: #fff;
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}
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</style>
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</head>
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<body>
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<div id="map"></div>
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<pre id="info"></pre>
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<script>
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var map = new maplibregl.Map({
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container: 'map',
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style: 'https://api.maptiler.com/maps/topo-v2/style.json?key=<replace-me>',
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center: [42, 42],
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zoom: 7
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});
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map.on('load', function () {
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});
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function MGRSString (Lat, Long) {
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//if (Lat < -80) return 'Too far South' ; if (Lat > 84) return 'Too far North' ;
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var c = 1 + Math.floor ((Long+180)/6);
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var e = c*6 - 183 ;
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var k = Lat*Math.PI/180;
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var l = Long*Math.PI/180;
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var m = e*Math.PI/180;
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var n = Math.cos (k);
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var o = 0.006739496819936062*Math.pow (n,2);
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var p = 40680631590769/(6356752.314*Math.sqrt(1 + o));
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var q = Math.tan (k);
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var r = q*q;
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var s = (r*r*r) - Math.pow (q,6);
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var t = l - m;
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var u = 1.0 - r + o;
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var v = 5.0 - r + 9*o + 4.0*(o*o);
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var w = 5.0 - 18.0*r + (r*r) + 14.0*o - 58.0*r*o;
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var x = 61.0 - 58.0*r + (r*r) + 270.0*o - 330.0*r*o;
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var y = 61.0 - 479.0*r + 179.0*(r*r) - (r*r*r);
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var z = 1385.0 - 3111.0*r + 543.0*(r*r) - (r*r*r);
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var aa = p*n*t + (p/6.0*Math.pow (n,3)*u*Math.pow (t,3)) + (p/120.0*Math.pow (n,5)*w*Math.pow (t,5)) + (p/5040.0*Math.pow (n,7)*y*Math.pow (t,7));
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var ab = 6367449.14570093*(k - (0.00251882794504*Math.sin (2*k)) + (0.00000264354112*Math.sin (4*k)) - (0.00000000345262*Math.sin (6*k)) + (0.000000000004892*Math.sin (8*k))) + (q/2.0*p*Math.pow (n,2)*Math.pow (t,2)) + (q/24.0*p*Math.pow (n,4)*v*Math.pow (t,4)) + (q/720.0*p*Math.pow (n,6)*x*Math.pow (t,6)) + (q/40320.0*p*Math.pow (n,8)*z*Math.pow (t,8));
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aa = aa*0.9996 + 500000.0;
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ab = ab*0.9996; if (ab < 0.0) ab += 10000000.0;
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var ad = 'CDEFGHJKLMNPQRSTUVWXX'.charAt (Math.floor (Lat/8 + 10));
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var ae = Math.floor (aa/100000);
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var af = ['ABCDEFGH','JKLMNPQR','STUVWXYZ'][(c-1)%3].charAt (ae-1);
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var ag = Math.floor (ab/100000)%20;
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var ah = ['ABCDEFGHJKLMNPQRSTUV','FGHJKLMNPQRSTUVABCDE'][(c-1)%2].charAt (ag);
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function pad (val) {if (val < 10) {val = '0000' + val} else if (val < 100) {val = '000' + val} else if (val < 1000) {val = '00' + val} else if (val < 10000) {val = '0' + val};return val};
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aa = Math.floor (aa%100000); aa = pad (aa);
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ab = Math.floor (ab%100000); ab = pad (ab);
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return c + ad + ' ' + af + ah + ' ' + aa + ' ' + ab;
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};
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map.on('mousemove', function (e) {
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var coordinate = e.lngLat.wrap();
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document.getElementById('info').innerHTML = MGRSString(coordinate.lat, coordinate.lng);
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});
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</script>
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</body>
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</html>
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