Update to latest upstream polyline decoder

[rails.git] / vendor / assets / leaflet / leaflet.polyline.js

diff --git a/vendor/assets/leaflet/leaflet.polyline.js b/vendor/assets/leaflet/leaflet.polyline.js
old mode 100755 (executable)
new mode 100644 (file)
index b7e85d6..5f35ed0
--- a/vendor/assets/leaflet/leaflet.polyline.js
+++ b/vendor/assets/leaflet/leaflet.polyline.js
@@ -1,127 +1,235 @@
 /*
 /*

- * 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;
+       }
+})();