Class: Navaid

Inherits:
Object
  • Object
show all
Defined in:
lib/navaid.rb

Overview

NAVAID_FILE = “/home/chief/dev/nav.dat.gz”

Defined Under Namespace

Classes: Runway, Vor

Instance Method Summary collapse

Constructor Details

#initialize(arg = nil) ⇒ Navaid

Returns a new instance of Navaid.



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# File 'lib/navaid.rb', line 19

def initialize(arg=nil)
  @vors = Array.new
  @runways = Array.new
  @lonSort = Array.new
  @latSort = Array.new
  @rwlatSort = Array.new
  @rwlonSort = Array.new
  @navaidFile = NAVAID_FILE
  
  vorCount = 0
  rwCount = 0
  
  checkForNavaidFile(arg)
  
  begin
    Zlib::GzipReader.open(@navaidFile) {|gz|
      gz.each_line do |l|
        vordata=[]
        if l[0,2] == "2 " or l[0,2] == "3 " then
          vordata = l.split(" ")
          # is it a NDB?
          if l[0,2] == "2 " then
            freq = vordata[4].to_i
            type = "NDB"
          else
            # freq is in MHz * 100
            freq = vordata[4].to_i / 100.0
            type = vordata[-1]
          end
          @vors << Vor.new( vordata[1], vordata[2], freq, vordata[7], vordata[8..-2].join(" "), type, nil)
          @latSort << [vordata[1].to_f, vorCount]
          @lonSort << [vordata[2].to_f, vorCount]
          vorCount += 1
        end

        # check for runways
        if l[0,2] == "4 " then
          rwdata = l.split(" ")
          # freq is in MHz * 100
          @runways << Runway.new( rwdata[1], rwdata[2], rwdata[4].to_i / 100.0, rwdata[3].to_i, 
              rwdata[6].to_f, rwdata[8], rwdata[9], nil)
          @rwlatSort << [rwdata[1].to_f, rwCount]
          @rwlonSort << [rwdata[2].to_f, rwCount]
          rwCount += 1
        end
      end
    }

    @runways.sort! do |a,b|
      a.airportName <=> b.airportName
    end

    Zlib::GzipReader.open(@navaidFile) {|gz|
      mmdata = nil
      range = nil
      gz.each_line do |l|
        # check for MiddleMarker used for placement of cone peak
        if l[0,2] == "8 " then
          mmdata = l.split(" ")
          range = @runways.bsearch_range {|rw| rw.airportName <=> mmdata[8]}
          rwMod = @runways[range].find do |rw|
            rw.runwayName == mmdata[9]
          end
          # exchange lat and lon with position of corresponding MiddleMarker
          if !rwMod.nil? then
            rwMod.lat = mmdata[1]
            rwMod.lon = mmdata[2]
          end
        end
      end
    }


    @latSort.sort! do |a,b|
      a[0] <=> b[0]
    end
    @lonSort.sort! do |a,b|
      a[0] <=> b[0]
    end
    @rwlatSort.sort! do |a,b|
      a[0] <=> b[0]
    end
    @rwlonSort.sort! do |a,b|
      a[0] <=> b[0]
    end
  rescue Errno::ENOENT
    puts "Warning. Could not find data file for VORs."
  end
#   ap @vors
end

Instance Method Details

#checkForNavaidFile(arg) ⇒ Object 



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# File 'lib/navaid.rb', line 110

def checkForNavaidFile(arg)
  root = ENV['FG_ROOT']
  root = "" if root.nil?
  arg="" if arg.nil?
  paths=[ arg, root + "/Navaids", "/usr/share/games/FlightGear/Navaids", "%ProgramFiles%/FlightGear/data/Navaids" ]
  paths.each do |path|
    if FileTest.exist?(path) then
      @navaidFile = path + "/nav.dat.gz"
      puts "Found \"#{path}\" for loading navigation aids."
      break
    end
  end
end

#getRunways(box) ⇒ Object 



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# File 'lib/navaid.rb', line 150

def getRunways(box)
  i = @rwlatSort.bsearch_lower_boundary {|x| x[0] <=> box[1][0]}
  j = @rwlatSort.bsearch_upper_boundary {|x| x[0] <=> box[1][1]}
  latCandidates = @rwlatSort[i...j].collect do |a|
    a[1] # return its array index
  end
  # protect against excessive CPU load
  return [] if j-i > 1000

  i = @rwlonSort.bsearch_lower_boundary {|x| x[0] <=> box[0][0]}
  j = @rwlonSort.bsearch_upper_boundary {|x| x[0] <=> box[0][1]}
  lonCandidates = @rwlonSort[i...j].collect do |a|
    a[1] # return its array index
  end
  # protect against excessive CPU load
  return [] if j-i > 1000
  
  cross=latCandidates.find_all do |a|
    lonCandidates.include?(a)
  end

  cross.collect do |a|
    @runways[a]
  end
end

#getVORs(box) ⇒ Object 



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# File 'lib/navaid.rb', line 124

def getVORs(box)
  i = @latSort.bsearch_lower_boundary {|x| x[0] <=> box[1][0]}
  j = @latSort.bsearch_upper_boundary {|x| x[0] <=> box[1][1]}
  latCandidates = @latSort[i...j].collect do |a|
    a[1] # return its array index
  end
  # protect against excessive CPU load
  return [] if j-i > 2000

  i = @lonSort.bsearch_lower_boundary {|x| x[0] <=> box[0][0]}
  j = @lonSort.bsearch_upper_boundary {|x| x[0] <=> box[0][1]}
  lonCandidates = @lonSort[i...j].collect do |a|
    a[1] # return its array index
  end
  # protect against excessive CPU load
  return [] if j-i > 2000
  
  cross=latCandidates.find_all do |a|
    lonCandidates.include?(a)
  end

  cross.collect do |a|
    @vors[a]
  end
end