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97 lines
3.4 KiB
JavaScript
97 lines
3.4 KiB
JavaScript
// Fisher-Yates shuffle
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function shuffle (array) {
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var i = 0,
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j = 0,
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temp = null;
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for (i = array.length - 1; i > 0; i -= 1) {
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j = Math.floor(Math.random() * (i + 1));
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temp = array[i];
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array[i] = array[j];
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array[j] = temp;
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}
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return array;
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}
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function getRandom(min, max) {
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return Math.random() * (max - min) + min;
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}
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function getNextHighestIndex(arr, value) {
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var i = arr.length;
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while (arr[--i] > value);
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return ++i;
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}
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function getUrlParameter(e) {
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return decodeURI((new RegExp(e + "=(.+?)(&|$)").exec(location.search) || [, null])[1])
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}
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// convert celsius to farenheight
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function C2F(c){
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return Math.round( c * 9 / 5 + 32 );
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}
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// meters per second to mph
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function mps2mph(meters) {
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return Math.round( parseFloat(meters) * 2.23694 );
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}
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// array swap
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Array.prototype.swap = function(a,b){ var tmp=this[a];this[a]=this[b];this[b]=tmp;};
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function degToCompass(deg){
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val = Math.round((deg/22.5)+.5);
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arr=["N","NE","E","SE","S","SW","W","NW"];
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return arr[(val % 8)];
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}
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function distance(lat1, lon1, lat2, lon2) {
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var radlat1 = Math.PI * lat1/180,
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radlat2 = Math.PI * lat2/180,
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theta = lon1-lon2,
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radtheta = Math.PI * theta/180,
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dist = Math.sin(radlat1) * Math.sin(radlat2) + Math.cos(radlat1) * Math.cos(radlat2) * Math.cos(radtheta);
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dist = Math.acos(dist);
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dist = dist * 180/Math.PI;
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dist = dist * 60 * 1.1515;
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return dist;
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}
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function dewPoint(tem, r){
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tem = -1.0*(tem-32)*5/9 ;
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es = 6.112*Math.exp(-1.0*17.67*tem/(243.5 - tem));
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ed = r/100.0*es;
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eln = Math.log(ed/6.112);
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td = -243.5*eln/(eln - 17.67 );
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return Math.round( (td*9/5)+32 );
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}
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function heatIndex(T, R) { // T = temp, R = relative humidity
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var T2 = T*T, R2= R*R,
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c1 = -42.379, c2 = 2.04901523, c3 = 10.14333127,
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c4 = -0.22475541, c5 = -6.83783*Math.pow(10,-3), c6 = -5.481717*Math.pow(10,-2),
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c7 = 1.22874*Math.pow(10,-3), c8 = 8.5282*Math.pow(10,-4), c9 = -1.99*Math.pow(10,-6);
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return Math.round(c1 + c2*T + c3 *R + c4*T*R + c5*T2 + c6*R2 + c7*T2*R + c8*T*R2 + c9*T2*R2);
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}
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// maps current condition code to icon
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function getCCicon(ccCode){
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return "images/icons/" + ( "0" + {"20011d":1,"20011n":1,"20111d":1,"20111n":1,"20211d":1,"20211n":1,"21011d":1,"21011n":1,"21111d":1,"21111n":1,"21211d":1,"21211n":1,"22111d":1,"22111n":1,"23011d":1,"23011n":1,"23111d":1,"23111n":1,"23211d":1,"23211n":1,"30009d":5,"30009n":5,"30109d":5,"30109n":5,"30209d":5,"30209n":5,"31009d":5,"31009n":5,"31109d":5,"31109n":5,"31209d":5,"31209n":5,"31309d":5,"31309n":5,"31409d":5,"31409n":5,"32109d":5,"32109n":5,"50010d":7,"50010n":7,"50110d":8,"50110n":8,"50210d":31,"50210n":31,"50310d":31,"50310n":31,"50410d":31,"50410d":31,"51110d":6,"51110n":6,"52010d":7,"52010n":7,"52110d":8,"52110n":8,"52210d":31,"52210n":31,"53110d":29,"53110n":37,"60013d":10,"60013n":10,"60113d":12,"60113n":12,"60213d":33,"60213n":33,"61113d":13,"61113n":13,"61213d":13,"61213n":13,"61313d":13,"61313n":13,"61513d":2,"61513n":2,"61613d":2,"61613n":2,"62013d":10,"62013n":10,"62113d":12,"62113n":12,"62213d":33,"62213n":33,"70150d":15,"70150n":15,"71150d":14,"71150n":14,"72150d":16,"72150n":16,"73150d":16,"73150n":16,"74150d":15,"74150n":15,"75150d":16,"75150n":16,"76150d":14,"76150n":14,"76250d":14,"76250n":14,"77150d":18,"77150n":18,"78150d":1,"78150n":1,"80001d":26,"80001n":25,"80102d":28,"80102n":27,"80203d":22,"80203n":21,"80304d":24,"80304n":23,"80405d":20,"80405n":20}[ccCode]).slice(-2) + ".png";
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}
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// https://date-fns.org/docs/Getting-Started
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