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https://impactfm.fr/player/js/lib/system/math.js

js impactfm.fr collected 2026-10-02 11:33:20 UTC 980 bytes, 29 lines download raw bytes

1//==============================================================================
2function haversine(lat1, lon1, lat2, lon2){  
3    // generally used geo measurement function
4    
5    var R = 6378.137; // Radius of earth in KM
6    
7    var dLat = lat2 * Math.PI / 180 - lat1 * Math.PI / 180;
8    var dLon = lon2 * Math.PI / 180 - lon1 * Math.PI / 180;
9    
10    var a = Math.sin(dLat/2) * Math.sin(dLat/2) +            
11        Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
12        Math.sin(dLon/2) * Math.sin(dLon/2);
13
14    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
15    var d = R * c;
16    
17    return d * 1000; // meters
18}
19//==============================================================================
20function minmax(aValue, aMin, aMax) {
21    if (aValue > aMax) 
22        aValue = aMax ; 
23
24    if (aValue < aMin) 
25        aValue = aMin ; 
26    
27    return aValue ; 
28}
29//==============================================================================

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