Commit crschmdt's data browser patch.

[rails.git] / lib / osm.rb

diff --git a/lib/osm.rb b/lib/osm.rb
index af9608132e8f293aa971dbbb8317cbfa93aef99a..bd935102658576295b2670ca46a8b28de89e94b4 100644 (file)
--- a/lib/osm.rb
+++ b/lib/osm.rb
@@ -1,45 +1,116 @@
+# The OSM module provides support functions for OSM.

 module OSM
 
 module OSM
 

+  require 'time'
+  require 'rexml/parsers/sax2parser'
+  require 'rexml/text'
+  require 'xml/libxml'
+  require 'digest/md5'
+  require 'RMagick'
+
+  # 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
+
+    #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
+
+    #the following two functions will give you the x/y on the entire sheet
+
+    def ysheet(lat)
+      log(tan(PI / 4 + (lat * PI / 180 / 2))) / (PI / 180)
+    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
+
+

   # This piece of magic reads a GPX with SAX and spits out
   # lat/lng and stuff
   #
   # This would print every latitude value:
   #
   # 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 = OSM::GPXImporter.new('somefile.gpx')

   # gpx.points {|p| puts p['latitude']}
   # gpx.points {|p| puts p['latitude']}

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

   class GPXImporter
   class GPXImporter

+    # FIXME swap REXML for libXML

     attr_reader :possible_points
     attr_reader :actual_points
     attr_reader :tracksegs
 
     attr_reader :possible_points
     attr_reader :actual_points
     attr_reader :tracksegs
 

-    def initialize(filename)
-      @filename = filename
-      @possible_points = 0
-      @actual_points = 0
-      @tracksegs = 0
+    def initialize(file)
+      @file = file

     end
 
     def points
     end
 
     def points

-      file = File.new(@filename)
-      parser = REXML::Parsers::SAX2Parser.new( file )
+      @possible_points = 0
+      @actual_points = 0
+      @tracksegs = 0

 
       lat = -1
       lon = -1
       ele = -1
 
       lat = -1
       lon = -1
       ele = -1

-      date = Time.now();
+      date = DateTime.now();

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

+      @file.rewind
+
+      parser = REXML::Parsers::SAX2Parser.new(@file)
+

       parser.listen( :start_element,  %w{ trkpt }) do |uri,localname,qname,attributes| 
         lat = attributes['lat'].to_f
         lon = attributes['lon'].to_f
         gotlatlon = true
       parser.listen( :start_element,  %w{ trkpt }) do |uri,localname,qname,attributes| 
         lat = attributes['lat'].to_f
         lon = attributes['lon'].to_f
         gotlatlon = true

+        gotele = false
+        gotdate = false

         @possible_points += 1
       end
 
         @possible_points += 1
       end
 


@@ -50,8 +121,11 @@ module OSM
 
       parser.listen( :characters, %w{ time } ) do |text|
         if text && text != ''
 
       parser.listen( :characters, %w{ time } ) do |text|
         if text && text != ''

-          date = Time.parse(text)
-          gotdate = true
+          begin
+            date = DateTime.parse(text)
+            gotdate = true
+          rescue
+          end

         end
       end
 
         end
       end
 


@@ -64,14 +138,308 @@ module OSM
           ele = '0' unless gotele
           if lat < 90 && lat > -90 && lon > -180 && lon < 180
             @actual_points += 1
           ele = '0' unless gotele
           if lat < 90 && lat > -90 && lon > -180 && lon < 180
             @actual_points += 1

-            yield Hash['latitude' => lat,'longitude' => lon,'timestamp' => date,'altitude' => ele,'segment' => @tracksegs]
+            yield Hash['latitude' => lat, 'longitude' => lon, 'timestamp' => date, 'altitude' => ele, 'segment' => @tracksegs]

           end
         end
         gotlatlon = false
         gotele = false
         gotdate = false
       end
           end
         end
         gotlatlon = false
         gotele = false
         gotdate = false
       end

+

       parser.parse
     end
       parser.parse
     end

+
+    def get_picture(min_lat, min_lon, max_lat, max_lon, num_points)
+      #puts "getting picfor bbox #{min_lat},#{min_lon} - #{max_lat},#{max_lon}"
+      frames = 10
+      width = 250
+      height = 250
+      proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height)
+
+      linegc = Magick::Draw.new
+      linegc.stroke_linejoin('miter')
+      linegc.stroke_width(1)
+      linegc.stroke('#BBBBBB')
+      linegc.fill('#BBBBBB')
+
+      highlightgc = Magick::Draw.new
+      highlightgc.stroke_linejoin('miter')
+      highlightgc.stroke_width(3)
+      highlightgc.stroke('#000000')
+      highlightgc.fill('#000000')
+
+      images = []
+
+      frames.times do
+        image = Magick::Image.new(width, height) do |image|
+          image.background_color = 'white'
+          image.format = 'GIF'
+        end
+
+        images << image
+      end
+
+      oldpx = 0.0
+      oldpy = 0.0
+
+      first = true
+
+      m = 0
+      mm = 0
+      points do |p|
+        px = proj.x(p['longitude'])
+        py = proj.y(p['latitude'])
+
+        if m > 0
+          frames.times do |n|
+            if n == mm
+              gc = highlightgc.dup
+            else
+              gc = linegc.dup
+            end
+
+            gc.line(px, py, oldpx, oldpy)
+
+            gc.draw(images[n])
+          end
+        end
+
+        m += 1
+        if m > num_points.to_f / frames.to_f * (mm+1)
+          mm += 1
+        end
+
+        oldpy = py
+        oldpx = px
+      end
+
+      il = Magick::ImageList.new
+
+      images.each do |f|
+        il << f
+      end
+
+      il.delay = 50
+      il.format = 'GIF'
+
+      return il.to_blob
+    end
+
+    def get_icon(min_lat, min_lon, max_lat, max_lon)
+      #puts "getting icon for bbox #{min_lat},#{min_lon} - #{max_lat},#{max_lon}"
+      width = 50
+      height = 50
+      proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height)
+
+      gc = Magick::Draw.new
+      gc.stroke_linejoin('miter')
+      gc.stroke_width(1)
+      gc.stroke('#000000')
+      gc.fill('#000000')
+
+      image = Magick::Image.new(width, height) do |image|
+        image.background_color = 'white'
+        image.format = 'GIF'
+      end
+
+      oldpx = 0.0
+      oldpy = 0.0
+
+      first = true
+
+      points do |p|
+        px = proj.x(p['longitude'])
+        py = proj.y(p['latitude'])
+
+        gc.dup.line(px, py, oldpx, oldpy).draw(image) unless first
+
+        first = false
+        oldpy = py
+        oldpx = px
+      end
+
+      return image.to_blob
+    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
   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
+
+      if longitude
+        lon_el = XML::Node.new 'geo:long'
+        lon_el << longitude.to_s
+        item << lon_el
+      end
+
+      @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
+
+    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
+
+  # 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