polyline - npm Package Compare versions

Comparing version 0.0.1 to 0.0.2

API.md

@@ -1,9 +0,10 @@
-### polyline.decode(string)
+### polyline.decode(string[, precision])
 
 Takes a string representation of 1+ coordinate pairs
-and returns an array of lat, lon arrays.
+and returns an array of lat, lon arrays. If not specified,
+precision defaults to 5.
 
-### polyline.encode(array)
+### polyline.encode(array[, precision])
 
 Takes an array of lat, lon arrays and returns an encoded
-string.
+string. If not specified, precision defaults to 5.

package.json

@@ -5,3 +5,3 @@ {
   "description": "Polyline encoding and decoding",
-  "version": "0.0.1",
+  "version": "0.0.2",
   "repository": {
@@ -8,0 +8,0 @@ "type": "git",

src/polyline.js

@@ -8,4 +8,4 @@ var polyline = {};
 
-function encode(coordinate) {
-    coordinate = Math.round(coordinate * 1e5);
+function encode(coordinate, factor) {
+    coordinate = Math.round(coordinate * factor);
     coordinate <<= 1;
@@ -26,4 +26,3 @@ if (coordinate < 0) {
 // https://github.com/DennisOSRM/Project-OSRM-Web/blob/master/WebContent/routing/OSRM.RoutingGeometry.js
-polyline.decode = function(str) {
-
+polyline.decode = function(str, precision) {
     var index = 0,
@@ -37,3 +36,4 @@ lat = 0,
         latitude_change,
-        longitude_change;
+        longitude_change,
+        factor = Math.pow(10, -(precision || 5));
 
@@ -71,5 +71,3 @@ // Coordinates have variable length when encoded, so just keep
 
-        var precision = Math.pow(10, -5);
-
-        coordinates.push([lat * precision, lng * precision]);
+        coordinates.push([lat * factor, lng * factor]);
     }
@@ -80,11 +78,12 @@
 
-polyline.encode = function(coordinates) {
+polyline.encode = function(coordinates, precision) {
     if (!coordinates.length) return '';
 
-    var output = encode(coordinates[0][0]) + encode(coordinates[0][1]);
+    var factor = Math.pow(10, precision || 5),
+        output = encode(coordinates[0][0], factor) + encode(coordinates[0][1], factor);
 
     for (var i = 1; i < coordinates.length; i++) {
         var a = coordinates[i], b = coordinates[i - 1];
-        output += encode(a[0] - b[0]);
-        output += encode(a[1] - b[1]);
+        output += encode(a[0] - b[0], factor);
+        output += encode(a[1] - b[1], factor);
     }
@@ -91,0 +90,0 @@

test/polyline.test.js

@@ -5,2 +5,4 @@ var assert = require('assert'),
 describe('polyline', function() {
+    var example = [[38.5, -120.2], [40.7, -120.95], [43.252, -126.453]];
+
     function compare(coords, against) {
@@ -20,10 +22,8 @@ function a(x) { return Math.round(x * 100) / 100; }
         it('decodes a String into an Array of lat/lon pairs', function() {
-            var coords = polyline.decode('_p~iF~ps|U_ulLnnqC_mqNvxq`@');
-            var against = [
-                [38.5, -120.2],
-                [40.7, -120.95],
-                [43.252, -126.453]
-            ];
-            compare(coords, against);
+            compare(polyline.decode('_p~iF~ps|U_ulLnnqC_mqNvxq`@'), example);
         });
+
+        it('decodes with a custom precision', function() {
+            compare(polyline.decode('_izlhA~rlgdF_{geC~ywl@_kwzCn`{nI', 6), example);
+        });
     });
@@ -37,5 +37,9 @@
         it('encodes an Array of lat/lon pairs into a String', function() {
-            assert.equal(polyline.encode([[38.5, -120.2], [40.7, -120.95], [43.252, -126.453]]), '_p~iF~ps|U_ulLnnqC_mqNvxq`@');
+            assert.equal(polyline.encode(example), '_p~iF~ps|U_ulLnnqC_mqNvxq`@');
         });
+
+        it('encodes with a custom precision', function() {
+            assert.equal(polyline.encode(example, 6), '_izlhA~rlgdF_{geC~ywl@_kwzCn`{nI');
+        });
     });
 });

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Improved metrics

Total package byte prevSize

25998

increased by10.59%

Lines of code

106

increased by1.92%

Number of medium supply chain risk alerts

0

decreased by-100%

No dependency changes