3 # This piece of magic reads a GPX with SAX and spits out
6 # This would print every latitude value:
8 # gpx = OSM:GPXImporter.new('somefile.gpx')
9 # gpx.points {|p| puts p['latitude']}
12 require 'rexml/parsers/sax2parser'
20 def initialize(lat, lon, degrees_per_pixel, width, height)
21 #init me with your centre lat/lon, the number of degrees per pixel and the size of your image
24 @degrees_per_pixel = degrees_per_pixel
27 @dlon = width / 2 * degrees_per_pixel
28 @dlat = height / 2 * degrees_per_pixel * cos(@clat * PI / 180)
30 @tx = xsheet(@clon - @dlon)
31 @ty = ysheet(@clat - @dlat)
33 @bx = xsheet(@clon + @dlon)
34 @by = ysheet(@clat + @dlat)
38 #the following two functions will give you the x/y on the entire sheet
41 return 40008.0 / 360.0 * @degrees_per_pixel
45 log(tan(PI / 4 + (lat * PI / 180 / 2)))
52 #and these two will give you the right points on your image. all the constants can be reduced to speed things up. FIXME
55 return @height - ((ysheet(lat) - @ty) / (@by - @ty) * @height)
59 return ((xsheet(lon) - @tx) / (@bx - @tx) * @width)
65 # FIXME swap REXML for libXML
66 attr_reader :possible_points
67 attr_reader :actual_points
68 attr_reader :tracksegs
70 def initialize(filename)
78 file = File.new(@filename)
79 parser = REXML::Parsers::SAX2Parser.new( file )
89 parser.listen( :start_element, %w{ trkpt }) do |uri,localname,qname,attributes|
90 lat = attributes['lat'].to_f
91 lon = attributes['lon'].to_f
96 parser.listen( :characters, %w{ ele } ) do |text|
101 parser.listen( :characters, %w{ time } ) do |text|
102 if text && text != ''
103 date = Time.parse(text)
108 parser.listen( :end_element, %w{ trkseg } ) do |uri, localname, qname|
112 parser.listen( :end_element, %w{ trkpt } ) do |uri,localname,qname|
113 if gotlatlon && gotdate
114 ele = '0' unless gotele
115 if lat < 90 && lat > -90 && lon > -180 && lon < 180
117 yield Hash['latitude' => lat,'longitude' => lon,'timestamp' => date,'altitude' => ele,'segment' => @tracksegs]
127 def get_picture(min_lat, min_lon, max_lat, max_lon, num_points)
128 #puts "getting picfor bbox #{min_lat},#{min_lon} - #{max_lat},#{max_lon}"
132 rat= Math.cos( ((max_lat + min_lat)/2.0) / 180.0 * 3.141592)
133 proj = OSM::Mercator.new((min_lat + max_lat) / 2, (max_lon + min_lon) / 2, (max_lat - min_lat) / width / rat, width, height)
138 gc = Magick::Draw.new
139 gc.stroke_linejoin('miter')
142 gc.rectangle(0,0,width,height)
155 px = proj.x(p['longitude'])
156 py = proj.y(p['latitude'])
158 images[n].stroke_width(1)
159 images[n].stroke('#BBBBBB')
160 images[n].fill('#BBBBBB')
161 # puts "A #{px},#{py} - #{oldpx},#{oldpy}"
162 images[n].line(px, py, oldpx, oldpy ) unless first
164 images[mm].stroke_width(3)
165 images[mm].stroke('#000000')
166 images[mm].fill('#000000')
167 images[mm].line(px, py, oldpx, oldpy ) unless first
168 # puts "B #{px},#{py} - #{oldpx},#{oldpy}"
170 if m > num_points.to_f / frames.to_f * (mm+1)
178 il = Magick::ImageList.new
181 canvas = Magick::Image.new(width, height) {
182 self.background_color = 'white'
185 images[n].draw(canvas)
188 canvas.format = 'GIF'
197 def get_icon(min_lat, min_lon, max_lat, max_lon)
198 puts "getting icon for bbox #{min_lat},#{min_lon} - #{max_lat},#{max_lon}"
201 rat= Math.cos( ((max_lat + min_lat)/2.0) / 180.0 * 3.141592)
202 proj = OSM::Mercator.new((min_lat + max_lat) / 2, (max_lon + min_lon) / 2, (max_lat - min_lat) / width / rat, width, height)
206 gc = Magick::Draw.new
207 gc.stroke_linejoin('miter')
219 px = proj.x(p['longitude'])
220 py = proj.y(p['latitude'])
221 gc.line(px, py, oldpx, oldpy ) unless first
222 # puts "C #{px},#{py} - #{oldpx},#{oldpy}"
228 canvas = Magick::Image.new(width, height) {
229 self.background_color = 'white'
235 canvas.format = 'GIF'
236 return canvas.to_blob
242 def initialize(description='OpenStreetMap GPS Traces')
243 @doc = XML::Document.new
244 @doc.encoding = 'UTF-8'
246 rss = XML::Node.new 'rss'
248 rss['version'] = "2.0"
249 rss['xmlns:geo'] = "http://www.w3.org/2003/01/geo/wgs84_pos#"
250 @channel = XML::Node.new 'channel'
252 title = XML::Node.new 'title'
253 title << 'OpenStreetMap GPS Traces'
255 description_el = XML::Node.new 'description'
256 @channel << description_el
258 description_el << description
259 link = XML::Node.new 'link'
260 link << 'http://www.openstreetmap.org/traces/'
262 image = XML::Node.new 'image'
264 url = XML::Node.new 'url'
265 url << 'http://www.openstreetmap.org/feeds/mag_map-rss2.0.png'
267 title = XML::Node.new 'title'
268 title << "OpenStreetMap"
270 width = XML::Node.new 'width'
273 height = XML::Node.new 'height'
276 link = XML::Node.new 'link'
277 link << 'http://www.openstreetmap.org/traces/'
281 def add(latitude=0, longitude=0, title_text='dummy title', url='http://www.example.com/', description_text='dummy description', timestamp=Time.now)
282 item = XML::Node.new 'item'
284 title = XML::Node.new 'title'
287 link = XML::Node.new 'link'
291 description = XML::Node.new 'description'
292 description << description_text
295 pubDate = XML::Node.new 'pubDate'
296 pubDate << timestamp.xmlschema
299 lat_el = XML::Node.new 'geo:lat'
300 lat_el << latitude.to_s
303 lon_el = XML::Node.new 'geo:lon'
304 lon_el << longitude.to_s
317 doc = XML::Document.new
318 doc.encoding = 'UTF-8'
319 root = XML::Node.new 'osm'
320 root['version'] = API_VERSION
321 root['generator'] = 'OpenStreetMap server'