Class: Navaid

Inherits:
Object
  • Object
show all
Defined in:
lib/fgmapping/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/fgmapping/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/fgmapping/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/fgmapping/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/fgmapping/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