X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/d45db3acc42f2f19ac7df25e7c7af70559cfba3d..7aeead9175285ed2d8afa7d40057b57125bf8f2e:/lib/osm.rb diff --git a/lib/osm.rb b/lib/osm.rb index aab3e1335..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| @@ -410,4 +236,17 @@ module OSM 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