msfs-geo - npm Package Compare versions

Comparing version 0.1.0-alpha1 to 0.1.0-alpha2

dist/index.d.ts

@@ -6,3 +6,4 @@ export * from './bearingTo';
 export * from './greatCircleIntersection';
+export * from './getDistanceBounds';
 export * from './placeBearingDistance';
 export * from './trig';

dist/index.js

@@ -179,2 +179,51 @@ 'use strict';
 
+/**
+ * Returns the Southwest and Northeast corner of a box around a point with a minimum distance
+ * @param centre - The centre of the box
+ * @param distance - Half the side length of the box, the minimum distance to the centre
+ */
+const getDistanceBounds = (centre, distance) => {
+    const radLat = DEG_TO_RAD(centre.lat);
+    const radLong = DEG_TO_RAD(centre.long);
+    const radDist = distance / EARTH_RADIUS;
+    let minLat = radLat - radDist;
+    let maxLat = radLat + radDist;
+    const MAX_LAT_RAD = DEG_TO_RAD(MAX_LAT);
+    const MIN_LAT_RAD = DEG_TO_RAD(MIN_LAT);
+    const MAX_LON_RAD = DEG_TO_RAD(MAX_LON);
+    const MIN_LON_RAD = DEG_TO_RAD(MIN_LON);
+    let minLong;
+    let maxLong;
+    if (minLat > MIN_LAT_RAD && maxLat < MAX_LAT_RAD) {
+        const deltaLong = Math.asin(Math.sin(radDist) / Math.cos(radLat));
+        minLong = radLong - deltaLong;
+        if (minLong < MIN_LON_RAD) {
+            minLong += Math.PI * 2;
+        }
+        maxLong = radLong + deltaLong;
+        if (maxLong > MAX_LON_RAD) {
+            maxLong -= Math.PI * 2;
+        }
+    }
+    else {
+        // A pole is within the distance.
+        minLat = Math.max(minLat, MIN_LAT_RAD);
+        maxLat = Math.min(maxLat, MAX_LAT_RAD);
+        minLong = MIN_LON_RAD;
+        maxLong = MAX_LON_RAD;
+    }
+    return [
+        // Southwest
+        {
+            lat: RAD_TO_DEG(minLat),
+            long: RAD_TO_DEG(minLong),
+        },
+        // Northeast
+        {
+            lat: RAD_TO_DEG(maxLat),
+            long: RAD_TO_DEG(maxLong),
+        },
+    ];
+};
+
 exports.DEG_TO_RAD = DEG_TO_RAD;
@@ -199,2 +248,3 @@ exports.EARTH_RADIUS = EARTH_RADIUS;
 exports.distanceTo = distanceTo;
+exports.getDistanceBounds = getDistanceBounds;
 exports.greatCircleIntersection = greatCircleIntersection;
@@ -201,0 +251,0 @@ exports.placeBearingDistance = placeBearingDistance;

package.json

 {
   "name": "msfs-geo",
-  "version": "0.1.0-alpha1",
+  "version": "0.1.0-alpha2",
   "description": "A set of geographic mathematical utility functions, designed for use in aviation, hence the use of Nautical Miles, Feet, and Degrees",
@@ -5,0 +5,0 @@ "scripts": {

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546

increased by21.88%

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