Potlatch 0.10f

[rails.git] / lib / osm.rb

diff --git a/lib/osm.rb b/lib/osm.rb
index 41c5874599ef957a8422834459ff21849b2e3d2a..9c271607dc0160d1d7e5b2b78138dc04ed2dedf0 100644 (file)
--- a/lib/osm.rb
+++ b/lib/osm.rb
@@ -1,74 +1,252 @@
+# The OSM module provides support functions for OSM.

 module OSM
 
 module OSM
 

-  # This piece of magic reads a GPX with SAX and spits out
-  # lat/lng and stuff
-  #
-  # This would print every latitude value:
-  #
-  # gpx = OSM:GPXImporter.new('somefile.gpx')
-  # gpx.points {|p| puts p['latitude']}
-  

   require 'time'
   require 'rexml/parsers/sax2parser'
   require 'rexml/text'
   require 'time'
   require 'rexml/parsers/sax2parser'
   require 'rexml/text'

+  require 'xml/libxml'
+  require 'digest/md5'
+  require 'RMagick'

 
 

-  class GPXImporter
-    attr_reader :possible_points
-    attr_reader :tracksegs
+  # The base class for API Errors.
+  class APIError < RuntimeError
+  end
+
+  # Raised when an API object is not found.
+  class APINotFoundError < APIError
+  end
+
+  # Raised when a precondition to an API action fails sanity check.
+  class APIPreconditionFailedError < APIError
+  end
+
+  # Raised when to delete an already-deleted object.
+  class APIAlreadyDeletedError < APIError
+  end
+
+  # Helper methods for going to/from mercator and lat/lng.
+  class Mercator
+    include Math

 
 

-    def initialize(filename)
-      @filename = filename
-      @possible_points = 0
-      @tracksegs = 0
+    #init me with your bounding box and the size of your image
+    def initialize(min_lat, min_lon, max_lat, max_lon, width, height)
+      xsize = xsheet(max_lon) - xsheet(min_lon)
+      ysize = ysheet(max_lat) - ysheet(min_lat)
+      xscale = xsize / width
+      yscale = ysize / height
+      scale = [xscale, yscale].max
+
+      xpad = width * scale - xsize
+      ypad = height * scale - ysize
+
+      @width = width
+      @height = height
+
+      @tx = xsheet(min_lon) - xpad / 2
+      @ty = ysheet(min_lat) - ypad / 2
+
+      @bx = xsheet(max_lon) + xpad / 2
+      @by = ysheet(max_lat) + ypad / 2

     end
 
     end
 

-    def points
-      file = File.new(@filename)
-      parser = REXML::Parsers::SAX2Parser.new( file )
-
-      lat = -1
-      lon = -1
-      ele = -1
-      date = Time.now();
-      gotlatlon = false
-      gotele = false
-      gotdate = false
-
-      parser.listen( :start_element,  %w{ trkpt }) do |uri,localname,qname,attributes| 
-        lat = attributes['lat'].to_f
-        lon = attributes['lon'].to_f
-        gotlatlon = true
-        @possible_points += 1
-      end
+    #the following two functions will give you the x/y on the entire sheet

 
 

-      parser.listen( :characters, %w{ ele } ) do |text|
-        ele = text
-        gotele = true
-      end
+    def ysheet(lat)
+      log(tan(PI / 4 + (lat * PI / 180 / 2))) / (PI / 180)
+    end

 
 

-      parser.listen( :characters, %w{ time } ) do |text|
-        if text && text != ''
-          date = Time.parse(text)
-          gotdate = true
-        end
+    def xsheet(lon)
+      lon
+    end
+
+    #and these two will give you the right points on your image. all the constants can be reduced to speed things up. FIXME
+
+    def y(lat)
+      return @height - ((ysheet(lat) - @ty) / (@by - @ty) * @height)
+    end
+
+    def x(lon)
+      return  ((xsheet(lon) - @tx) / (@bx - @tx) * @width)
+    end
+  end
+
+  class GreatCircle
+    include Math
+
+    # initialise with a base position
+    def initialize(lat, lon)
+      @lat = lat * PI / 180
+      @lon = lon * PI / 180
+    end
+
+    # get the distance from the base position to a given position
+    def distance(lat, lon)
+      lat = lat * PI / 180
+      lon = lon * PI / 180
+      return 6372.795 * 2 * asin(sqrt(sin((lat - @lat) / 2) ** 2 + cos(@lat) * cos(lat) * sin((lon - @lon)/2) ** 2))
+    end
+
+    # get the worst case bounds for a given radius from the base position
+    def bounds(radius)
+      latradius = 2 * asin(sqrt(sin(radius / 6372.795 / 2) ** 2))
+      lonradius = 2 * asin(sqrt(sin(radius / 6372.795 / 2) ** 2 / cos(@lat) ** 2))
+      minlat = (@lat - latradius) * 180 / PI
+      maxlat = (@lat + latradius) * 180 / PI
+      minlon = (@lon - lonradius) * 180 / PI
+      maxlon = (@lon + lonradius) * 180 / PI
+      return { :minlat => minlat, :maxlat => maxlat, :minlon => minlon, :maxlon => maxlon }
+    end
+  end
+
+  class GeoRSS
+    def initialize(feed_title='OpenStreetMap GPS Traces', feed_description='OpenStreetMap GPS Traces', feed_url='http://www.openstreetmap.org/traces/')
+      @doc = XML::Document.new
+      @doc.encoding = 'UTF-8' 
+
+      rss = XML::Node.new 'rss'
+      @doc.root = rss
+      rss['version'] = "2.0"
+      rss['xmlns:geo'] = "http://www.w3.org/2003/01/geo/wgs84_pos#"
+      @channel = XML::Node.new 'channel'
+      rss << @channel
+      title = XML::Node.new 'title'
+      title <<  feed_title
+      @channel << title
+      description_el = XML::Node.new 'description'
+      @channel << description_el
+
+      description_el << feed_description
+      link = XML::Node.new 'link'
+      link << feed_url
+      @channel << link
+      image = XML::Node.new 'image'
+      @channel << image
+      url = XML::Node.new 'url'
+      url << 'http://www.openstreetmap.org/images/mag_map-rss2.0.png'
+      image << url
+      title = XML::Node.new 'title'
+      title << "OpenStreetMap"
+      image << title
+      width = XML::Node.new 'width'
+      width << '100'
+      image << width
+      height = XML::Node.new 'height'
+      height << '100'
+      image << height
+      link = XML::Node.new 'link'
+      link << feed_url
+      image << link
+    end
+
+    def add(latitude=0, longitude=0, title_text='dummy title', author_text='anonymous', url='http://www.example.com/', description_text='dummy description', timestamp=DateTime.now)
+      item = XML::Node.new 'item'
+
+      title = XML::Node.new 'title'
+      item << title
+      title << title_text
+      link = XML::Node.new 'link'
+      link << url
+      item << link
+
+      guid = XML::Node.new 'guid'
+      guid << url
+      item << guid
+
+      description = XML::Node.new 'description'
+      description << description_text
+      item << description
+
+      author = XML::Node.new 'author'
+      author << author_text
+      item << author
+
+      pubDate = XML::Node.new 'pubDate'
+      pubDate << timestamp.to_s(:rfc822)
+      item << pubDate
+
+      if latitude
+        lat_el = XML::Node.new 'geo:lat'
+        lat_el << latitude.to_s
+        item << lat_el

       end
 
       end
 

-      parser.listen( :end_element, %w{ trkseg } ) do |uri, localname, qname|
-        @tracksegs += 1
+      if longitude
+        lon_el = XML::Node.new 'geo:long'
+        lon_el << longitude.to_s
+        item << lon_el

       end
 
       end
 

-      parser.listen( :end_element, %w{ trkpt } ) do |uri,localname,qname|
-        if gotlatlon && gotdate
-          ele = '0' unless gotele
-          if lat < 90 && lat > -90 && lon > -180 && lon < 180
-            yield Hash['latitude' => lat,'longitude' => lon,'timestamp' => date,'altitude' => ele,'segment' => @tracksegs]
+      @channel << item
+    end
+
+    def to_s
+      return @doc.to_s
+    end
+  end
+
+  class API
+    def get_xml_doc
+      doc = XML::Document.new
+      doc.encoding = 'UTF-8' 
+      root = XML::Node.new 'osm'
+      root['version'] = API_VERSION
+      root['generator'] = 'OpenStreetMap server'
+      doc.root = root
+      return doc
+    end
+  end
+
+  def self.IPLocation(ip_address)
+    Timeout::timeout(4) do
+      Net::HTTP.start('api.hostip.info') do |http|
+        country = http.get("/country.php?ip=#{ip_address}").body
+        country = "GB" if country == "UK"
+        Net::HTTP.start('ws.geonames.org') do |http|
+          xml = REXML::Document.new(http.get("/countryInfo?country=#{country}").body)
+          xml.elements.each("geonames/country") do |ele|
+            minlon = ele.get_text("bBoxWest").to_s
+            minlat = ele.get_text("bBoxSouth").to_s
+            maxlon = ele.get_text("bBoxEast").to_s
+            maxlat = ele.get_text("bBoxNorth").to_s
+            return { :minlon => minlon, :minlat => minlat, :maxlon => maxlon, :maxlat => maxlat }

           end
         end
           end
         end

-        gotlatlon = false
-        gotele = false
-        gotdate = false

       end
       end

-      parser.parse

     end
     end

+
+    return nil
+  rescue Exception
+    return nil
+  end
+
+  # Construct a random token of a given length
+  def self.make_token(length = 30)
+    chars = 'abcdefghijklmnopqrtuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
+    token = ''
+
+    length.times do
+      token += chars[(rand * chars.length).to_i].chr
+    end
+
+    return token

   end
   end

+
+  # Return an encrypted version of a password
+  def self.encrypt_password(password, salt)
+    return Digest::MD5.hexdigest(password) if salt.nil?
+    return Digest::MD5.hexdigest(salt + password)
+  end
+
+  # Return an SQL fragment to select a given area of the globe
+  def self.sql_for_area(minlat, minlon, maxlat, maxlon, prefix = nil)
+    tilesql = QuadTile.sql_for_area(minlat, minlon, maxlat, maxlon, prefix)
+    minlat = (minlat * 10000000).round
+    minlon = (minlon * 10000000).round
+    maxlat = (maxlat * 10000000).round
+    maxlon = (maxlon * 10000000).round
+
+    return "#{tilesql} AND #{prefix}latitude BETWEEN #{minlat} AND #{maxlat} AND #{prefix}longitude BETWEEN #{minlon} AND #{maxlon}"
+  end
+
+

 end
 end