wakaba/js-geo-encodedpolyline
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encodedpolyline.js ~~~~~~~~~~~~~~~~~~ Encoding and decoding of encoded polylines. This script implements the Encoded Polyline Algorithm as used by Google Maps and other map applications. * Usage <script src=encodedpolyline.js></script> <script> console.log (EncodedPolyline.encode ([[lat, lon], ...], 1e5)); console.log (EncodedPolyline.decode (input, 2, 1e5)); </script> * Methods Following methods are available: encoded = EncodedPolyline.encode (decoded, f) Encodes the list of items and returns the result string. The first argument must be an Array of Arrays, where the inner Arrays must contain same numbers of items. Each item of the inner Arrays must be numbers. To encode a list of pairs of latitude and longitude, as used by Google Maps, specify the list of latitude and longitude (both in decimal), as an Array of Arrays, and the factor value |1e5|, as the arguments. decoded = EncodedPolyline.decode (encoded, n, f) Decodes the encoded polyline string and returns the result list. The second argument represents the number of the items in each pair. To decode a polyline encoded list of pairs of latitude and longitude, as used by Google Maps, specify the encoded string, the number of items in each pair |2| (i.e. latitude and longitude), and the factor value |1e5|. The method returns an Array of Arrays, where inner Arrays represent the pairs in the list. When the input is broken, the returned list might be incomplete. Please note that the factor value I<$f> affects the precision of encoded numbers, i.e. whether the original value can be obtained by encoding a number and then decoding its result. When /n/ * /f/ is an integer, the exact number /n/ can be obtained. * Specification Encoded Polyline Algorithm Format <https://developers.google.com/maps/documentation/utilities/polylinealgorithm>. * See also SuikaWiki: Encoded Polyline <https://wiki.suikawiki.org/n/Encoded%20Polyline>. * Author Wakaba <wakaba@suikawiki.org>. * License Copyright 2016 Wakaba <wakaba@suikawiki.org>. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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