Class: Node

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

Constant Summary collapse

@@zoom = 
15

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id, time, lon, lat, elevation = 0, zoom = nil) ⇒ Node

Returns a new instance of Node.



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# File 'lib/fgmapping/tile.rb', line 16

def initialize(id, time, lon, lat, elevation=0, zoom=nil)
	@id = id
	if time.kind_of? String then
		#2009-06-18T20:32:16Z
		time =~ /(\d*)-(\d*)-(\d*)T(\d*):(\d*):(\d*)Z(\d*)/
		@timestamp = Time.local($1,$2,$3,$4,$5,$6,$7)
	else
		@timestamp = time
	end
	@lon = lon
	@lat = lat
	@elevation = elevation
	
	if !zoom.nil? then
		@@zoom = zoom
	end
	@xtile = toxtile
	@ytile = toytile
#		puts "Tiles: #{@xtile},#{@ytile}"
	@speed = 0
end

Instance Attribute Details

#elevation ⇒ Object

Returns the value of attribute elevation.



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# File 'lib/fgmapping/tile.rb', line 11

def elevation
  @elevation
end

#lat ⇒ Object

Returns the value of attribute lat.



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# File 'lib/fgmapping/tile.rb', line 11

def lat
  @lat
end

#lon ⇒ Object

Returns the value of attribute lon.



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# File 'lib/fgmapping/tile.rb', line 11

def lon
  @lon
end

#speed ⇒ Object

Returns the value of attribute speed.



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# File 'lib/fgmapping/tile.rb', line 11

def speed
  @speed
end

#timestamp ⇒ Object (readonly)

Returns the value of attribute timestamp.



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# File 'lib/fgmapping/tile.rb', line 11

def timestamp
  @timestamp
end

#xtile ⇒ Object

Returns the value of attribute xtile.



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# File 'lib/fgmapping/tile.rb', line 11

def xtile
  @xtile
end

#ytile ⇒ Object

Returns the value of attribute ytile.



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# File 'lib/fgmapping/tile.rb', line 11

def ytile
  @ytile
end

Instance Method Details

#distanceto(lon, lat) ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 111

def distanceto(lon, lat)
	lon1 = lon.rad
	lat1 = lat.rad
	lon2 = @lon.rad
	lat2 = @lat.rad
	begin
		return(Math.acos(Math.sin(lat1) * Math.sin(lat2) + Math.cos(lat1) * Math.cos(lat2) * Math.cos(lon2 - lon1)) * 6371000)
	rescue Errno::EDOM
		return 0
	end
end

#distanceto_str(lon, lat) ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 123

def distanceto_str(lon, lat)
	d = distanceto(lon, lat)
	if d < 2000 then
		return ("%.1f" % d) + "m"
	else
		return ("%.1f" % (d/1000.0)) + "km"
	end
end

#getfilenames(size, offset_x, offset_y) ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 56

def getfilenames(size, offset_x, offset_y)
	fn=[]
	x = (size.width / 256 + 1) / 2 
	y = (size.height / 256 + 1) / 2 
	(-x..x).each {|ix|
		cx = @xtile + ix + offset_x
		cx = 2 ** @@zoom - 1 if cx < 0
		cx = 0 if cx > 2 ** @@zoom - 1
		(-y..y).each {|iy|
			cy = @ytile + iy + offset_y
			cy = 2 ** @@zoom - 1 if cy < 0
			cy = 0 if cy > 2 ** @@zoom - 1
			fn << tofilename(cx,cy)
		}
	}
	return fn
end

#getLatLonBox(size, offset_x, offset_y) ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 48

def getLatLonBox(size, offset_x, offset_y)
	x = (size.width / 256 + 1) / 2
	y = (size.height / 256 + 1) / 2
	# add halve a tile at the borders to get to the border of each tile, not its center
	return [[tolon(@xtile + offset_x - x - 0.5), tolon(@xtile + offset_x + x + 0.5)],
			[tolat(@ytile + offset_y + y + 0.5), tolat(@ytile + offset_y - y - 0.5)]]
end

#tofilename(cx = @xtile, cy = @ytile) ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 44

def tofilename(cx=@xtile, cy=@ytile)
	return $MAPSHOME + "/#{@@zoom}/#{cx.to_i}/#{cy.to_i}"
end

#toGPStime ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 106

def toGPStime()
	#2009-06-18T20:32:16Z
	return @timestamp.strftime("%Y-%m-%dT%H:%M:%SZ")
end

#tolat(setto) ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 89

def tolat(setto)
	n = 2 ** @@zoom
	d = Math::PI - 2*Math::PI * setto / n
	return (180.0 / Math::PI * Math.atan(0.5 * (Math::exp(d) - Math::exp(-d))))
end

#tolon(setto) ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 84

def tolon(setto) 
	n = 2 ** @@zoom
	return (setto / n * 360.0 - 180.0)
end

#toxtile ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 95

def toxtile()
	n = 2 ** @@zoom
	return ((@lon + 180.0) / 360.0) * n
end

#toytile ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 100

def toytile()
	lat_rad = @lat/180.0 * Math::PI
	n = 2 ** @@zoom
	return (1.0 - (Math::log(Math::tan(lat_rad) + (1.0 / Math::cos(lat_rad))) / Math::PI)) / 2 * n
end

#zoom(zoomlevel) ⇒ Object 



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# File 'lib/fgmapping/tile.rb', line 38

def zoom(zoomlevel)
	@@zoom = zoomlevel
	@xtile = toxtile
	@ytile = toytile
end