+# 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
+ 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
+ #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)
end
end
+ class GreatCircle
+ include Math
- class GPXImporter
- # FIXME swap REXML for libXML
- attr_reader :possible_points
- attr_reader :actual_points
- attr_reader :tracksegs
-
- def initialize(filename)
- @filename = filename
- @possible_points = 0
- @actual_points = 0
- @tracksegs = 0
- 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
-
- parser.listen( :characters, %w{ ele } ) do |text|
- ele = text
- gotele = true
- end
-
- parser.listen( :characters, %w{ time } ) do |text|
- if text && text != ''
- date = Time.parse(text)
- gotdate = true
- 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
+ # initialise with a base position
+ def initialize(lat, lon)
+ @lat = lat * PI / 180
+ @lon = lon * PI / 180
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
+ # 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 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
+ # 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(description='OpenStreetMap GPS Traces')
+ 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"
@channel = XML::Node.new 'channel'
rss << @channel
title = XML::Node.new 'title'
- title << 'OpenStreetMap GPS Traces'
+ title << feed_title
@channel << title
description_el = XML::Node.new 'description'
@channel << description_el
- description_el << description
+ description_el << feed_description
link = XML::Node.new 'link'
- link << 'http://www.openstreetmap.org/traces/'
+ link << feed_url
@channel << link
image = XML::Node.new 'image'
@channel << image
url = XML::Node.new 'url'
- url << 'http://www.openstreetmap.org/feeds/mag_map-rss2.0.png'
+ url << 'http://www.openstreetmap.org/images/mag_map-rss2.0.png'
image << url
title = XML::Node.new 'title'
title << "OpenStreetMap"
height << '100'
image << height
link = XML::Node.new 'link'
- link << 'http://www.openstreetmap.org/traces/'
+ link << feed_url
image << link
end
- def add(latitude=0, longitude=0, title_text='dummy title', url='http://www.example.com/', description_text='dummy description', timestamp=Time.now)
+ 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'
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.xmlschema
+ pubDate << timestamp.to_s(:rfc822)
item << pubDate
- lat_el = XML::Node.new 'geo:lat'
- lat_el << latitude.to_s
- item << lat_el
+ if latitude
+ lat_el = XML::Node.new 'geo:lat'
+ lat_el << latitude.to_s
+ item << lat_el
+ end
- lon_el = XML::Node.new 'geo:lon'
- lon_el << longitude.to_s
- item << lon_el
+ if longitude
+ lon_el = XML::Node.new 'geo:long'
+ lon_el << longitude.to_s
+ item << lon_el
+ end
@channel << item
end
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
projects / rails.git / blobdiff