X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/93dab8a1272f8c807da841c0a55b37f74b65b8c3..9e1946b2837abe146777773177f4c48ffde8c06f:/lib/osm.rb diff --git a/lib/osm.rb b/lib/osm.rb index f9f77d1b5..82fc835b4 100644 --- a/lib/osm.rb +++ b/lib/osm.rb @@ -1,47 +1,102 @@ +# 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' + require 'xml/libxml' + require 'digest/md5' require 'RMagick' + # The base class for API Errors. + class APIError < RuntimeError + def render_opts + { :text => "", :status => :internal_server_error } + end + 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 + def render_opts + { :text => "", :status => :precondition_failed } + end + end + + # Raised when to delete an already-deleted object. + class APIAlreadyDeletedError < APIError + def render_opts + { :text => "", :status => :gone } + end + end + + # Raised when the user logged in isn't the same as the changeset + class APIUserChangesetMismatchError < APIError + def render_opts + { :text => "The user doesn't own that changeset", :status => :conflict } + end + end + + # Raised when the changeset provided is already closed + class APIChangesetAlreadyClosedError < APIError + def render_opts + { :text => "The supplied changeset has already been closed", :status => :conflict } + end + end + + # Raised when a change is expecting a changeset, but the changeset doesn't exist + class APIChangesetMissingError < APIError + def render_opts + { :text => "You need to supply a changeset to be able to make a change", :status => :conflict } + end + end + + # Raised when the provided version is not equal to the latest in the db. + class APIVersionMismatchError < APIError + def initialize(provided, latest) + @provided, @latest = provided, latest + end + + attr_reader :provided, :latest + + def render_opts + { :text => "Version mismatch: Provided " + provided.to_s + + ", server had: " + latest.to_s, :status => :conflict } + end + 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 + #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) @@ -59,176 +114,183 @@ module OSM end end + class GreatCircle + include Math + + # initialise with a base position + def initialize(lat, lon) + @lat = lat * PI / 180 + @lon = lon * PI / 180 + end - class GPXImporter - attr_reader :possible_points - attr_reader :actual_points - attr_reader :tracksegs + # 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 - def initialize(filename) - @filename = filename - @possible_points = 0 - @actual_points = 0 - @tracksegs = 0 + # 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 - def points - file = File.new(@filename) - parser = REXML::Parsers::SAX2Parser.new( file ) + 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 - lat = -1 - lon = -1 - ele = -1 - date = Time.now(); - gotlatlon = false - gotele = false - gotdate = false + 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' - 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 + title = XML::Node.new 'title' + item << title + title << title_text + link = XML::Node.new 'link' + link << url + item << link - parser.listen( :characters, %w{ ele } ) do |text| - ele = text - gotele = true - end + guid = XML::Node.new 'guid' + guid << url + item << guid - parser.listen( :characters, %w{ time } ) do |text| - if text && text != '' - date = Time.parse(text) - gotdate = true - end - end + description = XML::Node.new 'description' + description << description_text + item << description - parser.listen( :end_element, %w{ trkseg } ) do |uri, localname, qname| - @tracksegs += 1 - end + author = XML::Node.new 'author' + author << author_text + item << author - 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) - 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 + 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 - 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') - 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 - - m +=1 - if m > num_points.to_f / frames.to_f * (mm+1) - mm += 1 - end - first = false - oldpy = py - oldpx = px + if longitude + lon_el = XML::Node.new 'geo:long' + lon_el << longitude.to_s + item << lon_el end - il = Magick::ImageList.new + @channel << item + end - frames.times do |n| - canvas = Magick::Image.new(width, height) { - self.background_color = 'white' - } - begin - images[n].draw(canvas) - rescue ArgumentError + 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 - 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) - 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) + return nil + rescue Exception + return nil + end - images = [] + # Construct a random token of a given length + def self.make_token(length = 30) + chars = 'abcdefghijklmnopqrtuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789' + token = '' - gc = Magick::Draw.new - gc.stroke_linejoin('miter') + length.times do + token += chars[(rand * chars.length).to_i].chr + end - oldpx = 0.0 - oldpy = 0.0 + return token + end - first = true + # 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 - gc.stroke_width(1) - gc.stroke('#000000') - gc.fill('#000000') + # 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 - points do |p| - px = proj.x(p['longitude']) - py = proj.y(p['latitude']) - gc.line(px, py, oldpx, oldpy ) unless first - first = false - oldpy = py - oldpx = px - end + return "#{tilesql} AND #{prefix}latitude BETWEEN #{minlat} AND #{maxlat} AND #{prefix}longitude BETWEEN #{minlon} AND #{maxlon}" + 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 end