365 lines
9.5 KiB
Ruby
365 lines
9.5 KiB
Ruby
module OSM
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# This piece of magic reads a GPX with SAX and spits out
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# lat/lng and stuff
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#
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# This would print every latitude value:
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#
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# gpx = OSM:GPXImporter.new('somefile.gpx')
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# gpx.points {|p| puts p['latitude']}
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require 'time'
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require 'rexml/parsers/sax2parser'
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require 'rexml/text'
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require 'xml/libxml'
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require 'RMagick'
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class Mercator
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include Math
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def initialize(lat, lon, degrees_per_pixel, width, height)
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#init me with your centre lat/lon, the number of degrees per pixel and the size of your image
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@clat = lat
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@clon = lon
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@degrees_per_pixel = degrees_per_pixel
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@degrees_per_pixel = 0.0000000001 if @degrees_per_pixel < 0.0000000001
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@width = width
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@height = height
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@dlon = width / 2 * @degrees_per_pixel
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@dlat = height / 2 * @degrees_per_pixel * cos(@clat * PI / 180)
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@tx = xsheet(@clon - @dlon)
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@ty = ysheet(@clat - @dlat)
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@bx = xsheet(@clon + @dlon)
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@by = ysheet(@clat + @dlat)
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end
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#the following two functions will give you the x/y on the entire sheet
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def kilometerinpixels
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return 40008.0 / 360.0 * @degrees_per_pixel
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end
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def ysheet(lat)
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log(tan(PI / 4 + (lat * PI / 180 / 2)))
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end
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def xsheet(lon)
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lon
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end
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#and these two will give you the right points on your image. all the constants can be reduced to speed things up. FIXME
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def y(lat)
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return @height - ((ysheet(lat) - @ty) / (@by - @ty) * @height)
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end
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def x(lon)
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return ((xsheet(lon) - @tx) / (@bx - @tx) * @width)
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end
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end
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class GPXImporter
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# FIXME swap REXML for libXML
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attr_reader :possible_points
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attr_reader :actual_points
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attr_reader :tracksegs
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def initialize(filename)
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@possible_points = 0
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@actual_points = 0
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@tracksegs = 0
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@points = []
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file = File.new(filename)
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parser = REXML::Parsers::SAX2Parser.new( file )
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lat = -1
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lon = -1
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ele = -1
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date = DateTime.now();
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gotlatlon = false
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gotele = false
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gotdate = false
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parser.listen( :start_element, %w{ trkpt }) do |uri,localname,qname,attributes|
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lat = attributes['lat'].to_f
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lon = attributes['lon'].to_f
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gotlatlon = true
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@possible_points += 1
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end
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parser.listen( :characters, %w{ ele } ) do |text|
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ele = text
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gotele = true
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end
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parser.listen( :characters, %w{ time } ) do |text|
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if text && text != ''
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date = DateTime.parse(text)
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gotdate = true
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end
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end
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parser.listen( :end_element, %w{ trkseg } ) do |uri, localname, qname|
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@tracksegs += 1
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end
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parser.listen( :end_element, %w{ trkpt } ) do |uri,localname,qname|
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if gotlatlon && gotdate
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ele = '0' unless gotele
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if lat < 90 && lat > -90 && lon > -180 && lon < 180
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@actual_points += 1
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@points.push(Hash['latitude' => lat,'longitude' => lon,'timestamp' => date,'altitude' => ele,'segment' => @tracksegs])
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end
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end
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gotlatlon = false
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gotele = false
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gotdate = false
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end
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parser.parse
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end
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def points
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@points.each { |p| yield p }
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end
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def get_picture(min_lat, min_lon, max_lat, max_lon, num_points)
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#puts "getting picfor bbox #{min_lat},#{min_lon} - #{max_lat},#{max_lon}"
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frames = 10
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width = 250
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height = 250
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rat= Math.cos( ((max_lat + min_lat)/2.0) / 180.0 * 3.141592)
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proj = OSM::Mercator.new((min_lat + max_lat) / 2, (max_lon + min_lon) / 2, (max_lat - min_lat) / width / rat, width, height)
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images = []
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frames.times do
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gc = Magick::Draw.new
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gc.stroke_linejoin('miter')
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gc.stroke('#FFFFFF')
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gc.fill('#FFFFFF')
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gc.rectangle(0,0,width,height)
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gc.stroke_width(1)
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images << gc
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end
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oldpx = 0.0
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oldpy = 0.0
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first = true
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m = 0
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mm = 0
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points do |p|
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px = proj.x(p['longitude'])
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py = proj.y(p['latitude'])
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frames.times do |n|
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images[n].stroke_width(1)
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images[n].stroke('#BBBBBB')
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images[n].fill('#BBBBBB')
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# puts "A #{px},#{py} - #{oldpx},#{oldpy}"
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images[n].line(px, py, oldpx, oldpy ) unless first
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end
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images[mm].stroke_width(3)
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images[mm].stroke('#000000')
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images[mm].fill('#000000')
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images[mm].line(px, py, oldpx, oldpy ) unless first
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# puts "B #{px},#{py} - #{oldpx},#{oldpy}"
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m +=1
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if m > num_points.to_f / frames.to_f * (mm+1)
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mm += 1
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end
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first = false
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oldpy = py
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oldpx = px
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end
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il = Magick::ImageList.new
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frames.times do |n|
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canvas = Magick::Image.new(width, height) {
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self.background_color = 'white'
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}
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begin
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images[n].draw(canvas)
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rescue ArgumentError
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end
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canvas.format = 'GIF'
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il << canvas
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end
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il.delay = 50
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il.format = 'GIF'
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return il.to_blob
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end
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def get_icon(min_lat, min_lon, max_lat, max_lon)
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#puts "getting icon for bbox #{min_lat},#{min_lon} - #{max_lat},#{max_lon}"
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width = 50
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height = 50
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rat= Math.cos( ((max_lat + min_lat)/2.0) / 180.0 * 3.141592)
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proj = OSM::Mercator.new((min_lat + max_lat) / 2, (max_lon + min_lon) / 2, (max_lat - min_lat) / width / rat, width, height)
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images = []
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gc = Magick::Draw.new
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gc.stroke_linejoin('miter')
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oldpx = 0.0
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oldpy = 0.0
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first = true
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gc.stroke_width(1)
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gc.stroke('#000000')
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gc.fill('#000000')
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points do |p|
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px = proj.x(p['longitude'])
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py = proj.y(p['latitude'])
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gc.line(px, py, oldpx, oldpy ) unless first
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# puts "C #{px},#{py} - #{oldpx},#{oldpy}"
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first = false
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oldpy = py
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oldpx = px
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end
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canvas = Magick::Image.new(width, height) {
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self.background_color = 'white'
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}
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begin
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gc.draw(canvas)
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rescue ArgumentError
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end
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canvas.format = 'GIF'
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return canvas.to_blob
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end
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end
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class GreatCircle
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include Math
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# initialise with a base position
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def initialize(lat, lon)
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@lat = lat * PI / 180
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@lon = lon * PI / 180
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end
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# get the distance from the base position to a given position
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def distance(lat, lon)
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lat = lat * PI / 180
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lon = lon * PI / 180
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return 6372.795 * 2 * asin(sqrt(sin((lat - @lat) / 2) ** 2 + cos(@lat) * cos(lat) * sin((lon - @lon)/2) ** 2))
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end
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# get the worst case bounds for a given radius from the base position
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def bounds(radius)
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latradius = 2 * asin(sqrt(sin(radius / 6372.795 / 2) ** 2))
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lonradius = 2 * asin(sqrt(sin(radius / 6372.795 / 2) ** 2 / cos(@lat) ** 2))
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minlat = (@lat - latradius) * 180 / PI
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maxlat = (@lat + latradius) * 180 / PI
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minlon = (@lon - lonradius) * 180 / PI
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maxlon = (@lon + lonradius) * 180 / PI
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return { :minlat => minlat, :maxlat => maxlat, :minlon => minlon, :maxlon => maxlon }
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end
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end
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class GeoRSS
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def initialize(feed_title='OpenStreetMap GPS Traces', feed_description='OpenStreetMap GPS Traces', feed_url='http://www.openstreetmap.org/traces/')
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@doc = XML::Document.new
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@doc.encoding = 'UTF-8'
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rss = XML::Node.new 'rss'
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@doc.root = rss
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rss['version'] = "2.0"
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rss['xmlns:geo'] = "http://www.w3.org/2003/01/geo/wgs84_pos#"
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@channel = XML::Node.new 'channel'
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rss << @channel
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title = XML::Node.new 'title'
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title << feed_title
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@channel << title
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description_el = XML::Node.new 'description'
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@channel << description_el
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description_el << feed_description
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link = XML::Node.new 'link'
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link << feed_url
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@channel << link
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image = XML::Node.new 'image'
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@channel << image
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url = XML::Node.new 'url'
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url << 'http://www.openstreetmap.org/feeds/mag_map-rss2.0.png'
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image << url
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title = XML::Node.new 'title'
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title << "OpenStreetMap"
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image << title
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width = XML::Node.new 'width'
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width << '100'
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image << width
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height = XML::Node.new 'height'
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height << '100'
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image << height
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link = XML::Node.new 'link'
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link << feed_url
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image << link
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end
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def add(latitude=0, longitude=0, title_text='dummy title', url='http://www.example.com/', description_text='dummy description', timestamp=DateTime.now)
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item = XML::Node.new 'item'
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title = XML::Node.new 'title'
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item << title
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title << title_text
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link = XML::Node.new 'link'
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link << url
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item << link
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guid = XML::Node.new 'guid'
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guid << url
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item << guid
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description = XML::Node.new 'description'
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description << description_text
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item << description
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pubDate = XML::Node.new 'pubDate'
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pubDate << timestamp.to_s(:rfc822)
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item << pubDate
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if latitude
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lat_el = XML::Node.new 'geo:lat'
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lat_el << latitude.to_s
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item << lat_el
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end
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if longitude
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lon_el = XML::Node.new 'geo:long'
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lon_el << longitude.to_s
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item << lon_el
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end
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@channel << item
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end
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def to_s
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return @doc.to_s
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end
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end
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class API
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def get_xml_doc
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doc = XML::Document.new
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doc.encoding = 'UTF-8'
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root = XML::Node.new 'osm'
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root['version'] = API_VERSION
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root['generator'] = 'OpenStreetMap server'
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doc.root = root
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return doc
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end
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end
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end
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