/*
- * L.PolylineUtil contains utilify functions for polylines, two methods
- * are added to the L.Polyline object to support creation of polylines
- * from an encoded string and converting existing polylines to an
- * encoded string.
+ * Utility functions to decode/encode numbers and array's of numbers
+ * to/from strings (Google maps polyline encoding)
*
- * - L.Polyline.fromEncoded(encoded [, options]) returns a L.Polyline
- * - L.Polyline.encodePath() returns a string
+ * Extends the L.Polyline and L.Polygon object with methods to convert
+ * to and create from these strings.
*
- * Actual code from:
- * http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/\
+ * Jan Pieter Waagmeester <jieter@jieter.nl>
+ *
+ * Original code from:
+ * http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/
+ * (which is down as of december 2014)
*/
-/*jshint browser:true, debug: true, strict:false, globalstrict:false, indent:4, white:true, smarttabs:true*/
-/*global L:true, console:true*/
+(function () {
+ 'use strict';
+ var defaultOptions = function (options) {
+ if (typeof options === 'number') {
+ // Legacy
+ options = { precision: options };
+ } else {
+ options = options || {};
+ }
-// Inject functionality into Leaflet
-(function (L) {
- if (!(L.Polyline.prototype.fromEncoded)) {
- L.Polyline.fromEncoded = function (encoded, options) {
- return new L.Polyline(L.PolylineUtil.decode(encoded), options);
- };
- }
- if (!(L.Polygon.prototype.fromEncoded)) {
- L.Polygon.fromEncoded = function (encoded, options) {
- return new L.Polygon(L.PolylineUtil.decode(encoded), options);
- };
- }
+ options.precision = options.precision || 5;
+ options.factor = options.factor || Math.pow(10, options.precision);
+ options.dimension = options.dimension || 2;
+ return options;
+ };
+
+ var PolylineUtil = {
+ encode: function (points, options) {
+ options = defaultOptions(options);
+
+ var flatPoints = [];
+ for (var i = 0, len = points.length; i < len; ++i) {
+ var point = points[i];
+
+ if (options.dimension === 2) {
+ flatPoints.push(point.lat || point[0]);
+ flatPoints.push(point.lng || point[1]);
+ } else {
+ for (var dim = 0; dim < options.dimension; ++dim) {
+ flatPoints.push(point[dim]);
+ }
+ }
+ }
+
+ return this.encodeDeltas(flatPoints, options);
+ },
+
+ decode: function (encoded, options) {
+ options = defaultOptions(options);
+
+ var flatPoints = this.decodeDeltas(encoded, options);
+
+ var points = [];
+ for (var i = 0, len = flatPoints.length; i + (options.dimension - 1) < len;) {
+ var point = [];
+
+ for (var dim = 0; dim < options.dimension; ++dim) {
+ point.push(flatPoints[i++]);
+ }
+
+ points.push(point);
+ }
+
+ return points;
+ },
+
+ encodeDeltas: function(numbers, options) {
+ options = defaultOptions(options);
+
+ var lastNumbers = [];
+
+ for (var i = 0, len = numbers.length; i < len;) {
+ for (var d = 0; d < options.dimension; ++d, ++i) {
+ var num = numbers[i];
+ var delta = num - (lastNumbers[d] || 0);
+ lastNumbers[d] = num;
+
+ numbers[i] = delta;
+ }
+ }
+
+ return this.encodeFloats(numbers, options);
+ },
+
+ decodeDeltas: function(encoded, options) {
+ options = defaultOptions(options);
+
+ var lastNumbers = [];
+
+ var numbers = this.decodeFloats(encoded, options);
+ for (var i = 0, len = numbers.length; i < len;) {
+ for (var d = 0; d < options.dimension; ++d, ++i) {
+ numbers[i] = lastNumbers[d] = numbers[i] + (lastNumbers[d] || 0);
+ }
+ }
+
+ return numbers;
+ },
+
+ encodeFloats: function(numbers, options) {
+ options = defaultOptions(options);
+
+ for (var i = 0, len = numbers.length; i < len; ++i) {
+ numbers[i] = Math.round(numbers[i] * options.factor);
+ }
+
+ return this.encodeSignedIntegers(numbers);
+ },
+
+ decodeFloats: function(encoded, options) {
+ options = defaultOptions(options);
+
+ var numbers = this.decodeSignedIntegers(encoded);
+ for (var i = 0, len = numbers.length; i < len; ++i) {
+ numbers[i] /= options.factor;
+ }
- var encodeMixin = {
- encodePath: function () {
- return L.PolylineUtil.encode(this.getLatLngs());
+ return numbers;
+ },
+
+ /* jshint bitwise:false */
+
+ encodeSignedIntegers: function(numbers) {
+ for (var i = 0, len = numbers.length; i < len; ++i) {
+ var num = numbers[i];
+ numbers[i] = (num < 0) ? ~(num << 1) : (num << 1);
+ }
+
+ return this.encodeUnsignedIntegers(numbers);
+ },
+
+ decodeSignedIntegers: function(encoded) {
+ var numbers = this.decodeUnsignedIntegers(encoded);
+
+ for (var i = 0, len = numbers.length; i < len; ++i) {
+ var num = numbers[i];
+ numbers[i] = (num & 1) ? ~(num >> 1) : (num >> 1);
+ }
+
+ return numbers;
+ },
+
+ encodeUnsignedIntegers: function(numbers) {
+ var encoded = '';
+ for (var i = 0, len = numbers.length; i < len; ++i) {
+ encoded += this.encodeUnsignedInteger(numbers[i]);
+ }
+ return encoded;
+ },
+
+ decodeUnsignedIntegers: function(encoded) {
+ var numbers = [];
+
+ var current = 0;
+ var shift = 0;
+
+ for (var i = 0, len = encoded.length; i < len; ++i) {
+ var b = encoded.charCodeAt(i) - 63;
+
+ current |= (b & 0x1f) << shift;
+
+ if (b < 0x20) {
+ numbers.push(current);
+ current = 0;
+ shift = 0;
+ } else {
+ shift += 5;
+ }
+ }
+
+ return numbers;
+ },
+
+ encodeSignedInteger: function (num) {
+ num = (num < 0) ? ~(num << 1) : (num << 1);
+ return this.encodeUnsignedInteger(num);
+ },
+
+ // This function is very similar to Google's, but I added
+ // some stuff to deal with the double slash issue.
+ encodeUnsignedInteger: function (num) {
+ var value, encoded = '';
+ while (num >= 0x20) {
+ value = (0x20 | (num & 0x1f)) + 63;
+ encoded += (String.fromCharCode(value));
+ num >>= 5;
+ }
+ value = num + 63;
+ encoded += (String.fromCharCode(value));
+
+ return encoded;
}
+
+ /* jshint bitwise:true */
};
- if (!L.Polyline.prototype.encodePath) {
- L.Polyline.include(encodeMixin);
- }
- if (!L.Polygon.prototype.encodePath) {
- L.Polygon.include(encodeMixin);
- }
-})(L);
-
-// Utility functions.
-L.PolylineUtil = {};
-
-L.PolylineUtil.encode = function (latlngs) {
- var i, dlat, dlng;
- var plat = 0;
- var plng = 0;
- var encoded_points = "";
-
- for (i = 0; i < latlngs.length; i++) {
- var lat = latlngs[i].lat;
- var lng = latlngs[i].lng;
- var late5 = Math.floor(lat * 1e5);
- var lnge5 = Math.floor(lng * 1e5);
- dlat = late5 - plat;
- dlng = lnge5 - plng;
- plat = late5;
- plng = lnge5;
- encoded_points +=
- L.PolylineUtil.encodeSignedNumber(dlat) +
- L.PolylineUtil.encodeSignedNumber(dlng);
- }
- return encoded_points;
-};
-
-// This function is very similar to Google's, but I added
-// some stuff to deal with the double slash issue.
-L.PolylineUtil.encodeNumber = function (num) {
- var encodeString = "";
- var nextValue, finalValue;
- while (num >= 0x20) {
- nextValue = (0x20 | (num & 0x1f)) + 63;
- encodeString += (String.fromCharCode(nextValue));
- num >>= 5;
- }
- finalValue = num + 63;
- encodeString += (String.fromCharCode(finalValue));
- return encodeString;
-};
-
-// This one is Google's verbatim.
-L.PolylineUtil.encodeSignedNumber = function (num) {
- var sgn_num = num << 1;
- if (num < 0) {
- sgn_num = ~(sgn_num);
- }
- return (L.PolylineUtil.encodeNumber(sgn_num));
-};
-
-L.PolylineUtil.decode = function (encoded) {
- var len = encoded.length;
- var index = 0;
- var latlngs = [];
- var lat = 0;
- var lng = 0;
-
- while (index < len) {
- var b;
- var shift = 0;
- var result = 0;
- do {
- b = encoded.charCodeAt(index++) - 63;
- result |= (b & 0x1f) << shift;
- shift += 5;
- } while (b >= 0x20);
- var dlat = ((result & 1) ? ~(result >> 1) : (result >> 1));
- lat += dlat;
-
- shift = 0;
- result = 0;
- do {
- b = encoded.charCodeAt(index++) - 63;
- result |= (b & 0x1f) << shift;
- shift += 5;
- } while (b >= 0x20);
- var dlng = ((result & 1) ? ~(result >> 1) : (result >> 1));
- lng += dlng;
-
- latlngs.push(new L.LatLng(lat * 1e-5, lng * 1e-5));
+ // Export Node module
+ if (typeof module === 'object' && typeof module.exports === 'object') {
+ module.exports = PolylineUtil;
}
- return latlngs;
-};
\ No newline at end of file
+ // Inject functionality into Leaflet
+ if (typeof L === 'object') {
+ if (!(L.Polyline.prototype.fromEncoded)) {
+ L.Polyline.fromEncoded = function (encoded, options) {
+ return new L.Polyline(PolylineUtil.decode(encoded), options);
+ };
+ }
+ if (!(L.Polygon.prototype.fromEncoded)) {
+ L.Polygon.fromEncoded = function (encoded, options) {
+ return new L.Polygon(PolylineUtil.decode(encoded), options);
+ };
+ }
+
+ var encodeMixin = {
+ encodePath: function () {
+ return PolylineUtil.encode(this.getLatLngs());
+ }
+ };
+
+ if (!L.Polyline.prototype.encodePath) {
+ L.Polyline.include(encodeMixin);
+ }
+ if (!L.Polygon.prototype.encodePath) {
+ L.Polygon.include(encodeMixin);
+ }
+
+ L.PolylineUtil = PolylineUtil;
+ }
+})();
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