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# frozen_string_literal: true
require_relative 'polyline_encoder/delta'
require_relative 'polyline_encoder/value_encoder'
module GoogleDistanceMatrix
# Encodes a set of lat/lng pairs in to a polyline
# according to Google's Encoded Polyline Algorithm Format.
#
# See https://developers.google.com/maps/documentation/utilities/polylinealgorithm
class PolylineEncoder
# Encodes a set of lat/lng pairs
#
# Example
# encoded = PolylineEncoder.encode [[lat, lng], [lat, lng]]
def self.encode(array_of_lat_lng_pairs)
new(array_of_lat_lng_pairs).encode
end
# Initialize a new encoder
#
# Arguments
# array_of_lat_lng_pairs - The array of lat/lng pairs, like [[lat, lng], [lat, lng], ..etc]
# delta - An object responsible for rounding and calculate the deltas
# between the given lat/lng pairs.
# value_encoder - After deltas are calculated each value is passed to the encoder
# to be encoded in to ASCII characters
#
# @see ::encode
def initialize(array_of_lat_lng_pairs, delta: Delta.new, value_encoder: ValueEncoder.new)
@array_of_lat_lng_pairs = array_of_lat_lng_pairs
@delta = delta
@value_encoder = value_encoder
@encoded = nil
end
# Encode and returns the encoded string
def encode
return @encoded if @encoded
deltas = @delta.deltas_rounded @array_of_lat_lng_pairs
chars_array = deltas.map { |v| @value_encoder.encode v }
@encoded = chars_array.join
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems