Continue migration to node express typescript

client/src/other/utils.ts

@@ -0,0 +1,65 @@
+export function distance(lat1: number, lon1: number, lat2: number, lon2: number)
+{
+    const R = 6371e3; // metres
+    const φ1 = deg2rad(lat1); // φ, λ in radians
+    const φ2 = deg2rad(lat2);
+    const Δφ = deg2rad(lat2-lat1);
+    const Δλ = deg2rad(lon2-lon1);
+
+    const a = Math.sin(Δφ/2) * Math.sin(Δφ/2) + Math.cos(φ1) * Math.cos(φ2) * Math.sin(Δλ/2) * Math.sin(Δλ/2);
+    const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
+
+    const d = R * c; // in metres
+
+    return d;
+}
+
+export function bearing(lat1: number, lon1: number, lat2: number, lon2: number)
+{
+    const φ1 = deg2rad(lat1); // φ, λ in radians
+    const φ2 = deg2rad(lat2);
+    const λ1 = deg2rad(lon1); // φ, λ in radians
+    const λ2 = deg2rad(lon2);
+    const y = Math.sin(λ2-λ1) * Math.cos(φ2);
+    const x = Math.cos(φ1)*Math.sin(φ2) - Math.sin(φ1)*Math.cos(φ2)*Math.cos(λ2-λ1);
+    const θ = Math.atan2(y, x);
+    const brng = (rad2deg(θ) + 360) % 360; // in degrees
+
+    return brng;
+}
+
+const zeroPad = function(num: number, places: number)
+{
+    var string = String(num);
+    while (string.length < places)
+    {
+        string += "0";
+    }
+    return string;
+} 
+
+export function ConvertDDToDMS(D: number, lng: boolean) 
+{
+    var dir = D < 0 ? (lng ? "W" : "S") : lng ? "E" : "N";
+    var deg = 0 | (D < 0 ? (D = -D) : D);
+    var min = 0 | (((D += 1e-9) % 1) * 60);
+    var sec = (0 | (((D * 60) % 1) * 6000)) / 100;
+    var dec = Math.round((sec - Math.floor(sec)) * 100);
+    var sec = Math.floor(sec);
+    if (lng)
+        return dir + zeroPad(deg, 3) + "°" + zeroPad(min, 2) + "'" + zeroPad(sec, 2) + "." + zeroPad(dec, 2) + "\"";
+    else
+        return dir + zeroPad(deg, 2) + "°" + zeroPad(min, 2) + "'" + zeroPad(sec, 2) + "." + zeroPad(dec, 2) + "\"";
+}
+
+export function deg2rad(deg: number)
+{
+    var pi = Math.PI;
+    return deg * (pi/180);
+}
+
+export function rad2deg(rad: number)
+{
+    var pi = Math.PI;
+    return rad / (pi/180);
+}