Module: RailCalc

Defined in:
lib/RailCalc.rb

Class Method Summary collapse

Class Method Details

.getStation ⇒ Object 



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# File 'lib/RailCalc.rb', line 15

def self.getStation
  ir = IERail.new
    trainStations = ir.stations
  hash = {}
for code in trainStations do 
  hash[code.description]=code.location
end 
#puts hash
  #stations = { 
 #'Pearse' => [53.343160, -6.247490],
 #'Tara Street' => [53.347070, -6.253980],
 #'Dublin Connolly' => [53.351361, -6.250067],
 #'Clontarf Road' => [53.362897, -6227767],
 #'Killester' => [53.372762, -6.205333],
 #'Harmonstown' => [53.378554, -6.192266],
 #'Raheny' => [53.381485, -6177020]
#}

 hash.each do |station,coords|
# puts station
  # distance is = to hte result of the haversine with the following coords taken in
   distance = haversine(@lat,@long,coords[1].to_f,coords[0].to_f)
  # if distance is less than the set @min then replace @min with the new distance
   if distance < @min
     @min = distance
     @station = station#, coords[1],coords[0]
@coords = coords[1]
@coords2= coords[0]
   end
#puts "#{@lat} #{@long} #{coords[1]} #{coords[0]}" 
 end
 #############################
times = ir.station_times(@station.to_s,30)
 timesHash = Hash.new
#test = ir.stations

for code in times do 
#timesHash[code.traincode]=code.origin,code.destination, code.train_type ,code.duein ,code.last_location
  timesHash={:traincode => code.traincode, :traintype => code.train_type, :duein => code.duein, :lastlocation => code.last_location, :direction => code.direction}
  #, :origin => code.origin, :destination => code.destination_time

end
@times = timesHash
puts "load #{@times.to_json}"
#puts "load #{times}"
#puts "load #{timesHash}"
 #############################
return @station, @coords , @coords2
#return @times
end

.haversine(lat1, long1, lat2, long2) ⇒ Object 



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# File 'lib/RailCalc.rb', line 66

def self.haversine(lat1, long1, lat2, long2)
  dtor = Math::PI/180
  r = 6378.14*1000
  #puts  "The values are #{lat1}, #{long1}, #{lat2}, #{long2}"
  rlat1 = lat1*dtor
rlong1 = long1*dtor
  rlat2 = lat2*dtor
  rlong2 = long2*dtor

  dlon = rlong1 - rlong2
  dlat = rlat1 - rlat2

  a = power(Math::sin(dlat/2), 2) + Math::cos(rlat1)*Math::cos(rlat2)*power(Math::sin(dlon/2), 2)
  c = 2*Math::atan2(Math::sqrt(a), Math::sqrt(1-a))
  d = r*c
  d
end

.power(num, pow) ⇒ Object 



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# File 'lib/RailCalc.rb', line 84

def self.power(num, pow)
  num ** pow
end

.setupLoc(lat1, long1) ⇒ Object 



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# File 'lib/RailCalc.rb', line 5

def self.setupLoc(lat1, long1)
  @lat = lat1
  @long = long1
    # set min as an instance variable using @
    @min = 9999999999
    # create an instance variable to hold the station name
    @station = nil 
  self.getStation
end