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tour.rb
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tour.rb
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class Tour
def initialize( tour = nil )
if tour
set_tour( tour )
else
reset_tour
end
end
def generate_individual
set_tour
# Loop through all our destination cities and add them to our tour
TourManager.each_city do |city|
tour << city
end
# randomly reorder the tour
shuffle_tour!
end
def set_at_first_available( city )
index = tour.index( nil )
raise "No available spot left in tour! #{to_s}" unless index
tour[index] = city
index
end
def get_city( tour_position )
tour[ tour_position ]
end
def set_city( tour_position, city )
tour[tour_position] = city
# reset cached fitness and distance
@fitness = @distance = 0
end
def fitness
if @fitness == 0
@fitness = 1.0/distance
end
@fitness
end
def distance
if @distance == 0
tour_distance = 0
tour.each_with_index do |city, index|
from_city = city
if index + 1 < size
destination_city = get_city(index+1)
else
# If it is the last city in the turn, set
# the first city as the destination
destination_city = get_city(0)
end
tour_distance += from_city.distance_to(destination_city)
end
@distance = tour_distance
end
@distance
end
def contains_city?( city )
tour.include?( city )
end
def each_with_index(&block)
tour.each_with_index &block
end
def to_s
gene_string = "|"
tour.each do |city|
gene_string << "#{city}|"
end
"#{gene_string} => #{distance}"
end
def size
@tour.size
end
private
def tour
@tour
end
def shuffle_tour!
@tour = tour.shuffle
end
def set_tour( tour = [])
@fitness = 0
@distance = 0
@tour = tour
end
def reset_tour
set_tour
TourManager.number_of_cities.times { |i| tour << nil }
end
end