geo-point - npm Package Compare versions

Comparing version 1.1.1 to 1.1.2

lib/geo-point.js

@@ -103,8 +103,11 @@ 'use strict';
   static calculateBearing(point1, point2) {
-    const dLongitude = point2.longitude - point1.longitude;
-    const y = (cos(point1.latitude) * sin(point2.latitude)) - (sin(point1.latitude) * cos(point2.latitude) * cos(dLongitude));
-    const x = sin(dLongitude) * cos(point2.latitude);
-    const bearing = deg2rad(atan2(x, y));
+    const φ1 = deg2rad(point1.latitude), φ2 = deg2rad(point2.latitude);
+    const Δλ = deg2rad(point2.longitude - point1.longitude);
 
-    return 360 - (bearing + 360) % 360;
+    // see http://mathforum.org/library/drmath/view/55417.html
+    const y = sin(Δλ) * cos(φ2);
+    const x = cos(φ1) * sin(φ2) - sin(φ1) * cos(φ2) * cos(Δλ);
+    const θ = atan2(y, x);
+
+    return (rad2deg(θ) + 360) % 360;
   }
@@ -111,0 +114,0 @@

package.json

 {
   "name": "geo-point",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "description": "geo point",
@@ -5,0 +5,0 @@ "main": "index.js",

test/all-tests.spec.js

@@ -65,3 +65,3 @@ 'use strict';
       new GeoPoint(51.5, 1.15)
-    )).should.equals(360);
+    )).should.equals(89);
 
@@ -71,3 +71,8 @@ GeoPoint.calculateBearing(
       new GeoPoint(52, 0)
-    ).should.equals(360);
+    ).should.equals(0);
+
+    Math.round(GeoPoint.calculateBearing(
+      new GeoPoint(-6.231624, 106.802569),
+      new GeoPoint(-6.22063, 106.61694)
+    )).should.equals(273);
   });
@@ -74,0 +79,0 @@

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Improved metrics

Total package byte prevSize

13734

increased by1.47%

Lines of code

275

increased by2.23%

No dependency changes