X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/33a65a90c9d0e2ab121e1da9c3efedaf9e6a9789..6d7e69d4d3ec1a873ab5a6accab4ab3a290e5989:/lib/osm.rb

diff --git a/lib/osm.rb b/lib/osm.rb
index e5d3c7fbb..9c271607d 100644
--- a/lib/osm.rb
+++ b/lib/osm.rb
@@ -1,13 +1,6 @@
+# The OSM module provides support functions for 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'
@@ -15,36 +8,51 @@ module OSM
   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
 
-    def initialize(lat, lon, degrees_per_pixel, width, height)
-      #init me with your centre lat/lon, the number of degrees per pixel and the size of your image
-      @clat = lat
-      @clon = lon
-      @degrees_per_pixel = degrees_per_pixel
-      @degrees_per_pixel = 0.0000000001 if @degrees_per_pixel < 0.0000000001
+    #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
-      @dlon = width / 2 * @degrees_per_pixel
-      @dlat = height / 2 * @degrees_per_pixel  * cos(@clat * PI / 180)
-
-      @tx = xsheet(@clon - @dlon)
-      @ty = ysheet(@clat - @dlat)
 
-      @bx = xsheet(@clon + @dlon)
-      @by = ysheet(@clat + @dlat)
+      @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 kilometerinpixels
-      return 40008.0  / 360.0 * @degrees_per_pixel
-    end
-
     def ysheet(lat)
-      log(tan(PI / 4 +  (lat  * PI / 180 / 2)))
+      log(tan(PI / 4 + (lat * PI / 180 / 2))) / (PI / 180)
     end
 
     def xsheet(lon)
@@ -62,188 +70,6 @@ module OSM
     end
   end
 
-
-  class GPXImporter
-    # FIXME swap REXML for libXML
-    attr_reader :possible_points
-    attr_reader :actual_points
-    attr_reader :tracksegs
-
-    def initialize(filename)
-      @filename = filename
-    end
-
-    def points
-      @possible_points = 0
-      @actual_points = 0
-      @tracksegs = 0
-
-      lat = -1
-      lon = -1
-      ele = -1
-      date = DateTime.now();
-      gotlatlon = false
-      gotele = false
-      gotdate = false
-
-      parser = REXML::Parsers::SAX2Parser.new(File.new(@filename))
-
-      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
-
-      parser.listen( :characters, %w{ ele } ) do |text|
-        ele = text
-        gotele = true
-      end
-
-      parser.listen( :characters, %w{ time } ) do |text|
-        if text && text != ''
-          begin
-            date = DateTime.parse(text)
-            gotdate = true
-          rescue
-          end
-        end
-      end
-
-      parser.listen( :end_element, %w{ trkseg } ) do |uri, localname, qname|
-        @tracksegs += 1
-      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
-            @actual_points += 1
-            yield Hash['latitude' => lat, 'longitude' => lon, 'timestamp' => date, 'altitude' => ele, 'segment' => @tracksegs]
-          end
-        end
-        gotlatlon = false
-        gotele = false
-        gotdate = false
-      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
-      rat= Math.cos( ((max_lat + min_lat)/2.0) /  180.0 * 3.141592)
-      proj = OSM::Mercator.new((min_lat + max_lat) / 2, (max_lon + min_lon) / 2, (max_lat - min_lat) / width / rat, width, height)
-
-      images = []
-
-      frames.times do
-        gc =  Magick::Draw.new
-        gc.stroke_linejoin('miter')
-        gc.stroke('#FFFFFF')
-        gc.fill('#FFFFFF')
-        gc.rectangle(0,0,width,height)
-        gc.stroke_width(1)
-        images << gc
-      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'])
-        frames.times do |n|
-          images[n].stroke_width(1)
-          images[n].stroke('#BBBBBB')
-          images[n].fill('#BBBBBB')
-        #  puts "A #{px},#{py} - #{oldpx},#{oldpy}"
-          images[n].line(px, py, oldpx, oldpy ) unless first
-        end
-        images[mm].stroke_width(3)
-        images[mm].stroke('#000000')
-        images[mm].fill('#000000')
-        images[mm].line(px, py, oldpx, oldpy ) unless first
-      #  puts "B #{px},#{py} - #{oldpx},#{oldpy}"
-        m +=1
-        if m > num_points.to_f / frames.to_f * (mm+1)
-          mm += 1
-        end
-        first = false
-        oldpy = py
-        oldpx = px
-      end
-
-      il = Magick::ImageList.new
-
-      frames.times do |n|
-        canvas = Magick::Image.new(width, height) {
-          self.background_color = 'white'
-        }
-        begin
-          images[n].draw(canvas)
-        rescue ArgumentError
-        end
-        canvas.format = 'GIF'
-        il << canvas
-      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
-      rat= Math.cos( ((max_lat + min_lat)/2.0) /  180.0 * 3.141592)
-      proj = OSM::Mercator.new((min_lat + max_lat) / 2, (max_lon + min_lon) / 2, (max_lat - min_lat) / width / rat, width, height)
-
-      images = []
-
-      gc =  Magick::Draw.new
-      gc.stroke_linejoin('miter')
-
-      oldpx = 0.0
-      oldpy = 0.0
-
-      first = true
-
-      gc.stroke_width(1)
-      gc.stroke('#000000')
-      gc.fill('#000000')
-
-      points do |p|
-        px = proj.x(p['longitude'])
-        py = proj.y(p['latitude'])
-        gc.line(px, py, oldpx, oldpy ) unless first
-       # puts "C #{px},#{py} - #{oldpx},#{oldpy}"
-        first = false
-        oldpy = py
-        oldpx = px
-      end
-
-      canvas = Magick::Image.new(width, height) {
-        self.background_color = 'white'
-      }
-      begin
-        gc.draw(canvas)
-      rescue ArgumentError
-      end
-      canvas.format = 'GIF'
-      return canvas.to_blob
-    end
-
-  end
-
   class GreatCircle
     include Math
 
@@ -276,7 +102,7 @@ module OSM
     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"
@@ -374,7 +200,7 @@ module OSM
     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"
+        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|
@@ -412,13 +238,15 @@ module OSM
   end
 
   # Return an SQL fragment to select a given area of the globe
-  def self.sql_for_area(minlat, minlon, maxlat, maxlon)
-    tilesql = QuadTile.sql_for_area(minlat, minlon, maxlat, maxlon)
-    minlat = (minlat * 1000000).round
-    minlon = (minlon * 1000000).round
-    maxlat = (maxlat * 1000000).round
-    maxlon = (maxlon * 1000000).round
-
-    return "#{tilesql} AND latitude BETWEEN #{minlat} AND #{maxlat} AND longitude BETWEEN #{minlon} AND #{maxlon}"
+  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