@clat = lat
@clon = lon
@degrees_per_pixel = degrees_per_pixel
+ @degrees_per_pixel = 0.0000000001 if @degrees_per_pixel < 0.0000000001
@width = width
@height = height
- @dlon = width / 2 * degrees_per_pixel
- @dlat = height / 2 * degrees_per_pixel * cos(@clat * PI / 180)
+ @dlon = width / 2 * @degrees_per_pixel
+ @dlat = height / 2 * @degrees_per_pixel * cos(@clat * PI / 180)
@tx = xsheet(@clon - @dlon)
@ty = ysheet(@clat - @dlat)
attr_reader :tracksegs
def initialize(filename)
- @filename = filename
@possible_points = 0
@actual_points = 0
@tracksegs = 0
- end
+ @points = []
- def points
- file = File.new(@filename)
+ file = File.new(filename)
parser = REXML::Parsers::SAX2Parser.new( file )
lat = -1
lon = -1
ele = -1
- date = Time.now();
+ date = DateTime.now();
gotlatlon = false
gotele = false
gotdate = false
parser.listen( :characters, %w{ time } ) do |text|
if text && text != ''
- date = Time.parse(text)
+ date = DateTime.parse(text)
gotdate = true
end
end
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]
+ @points.push(Hash['latitude' => lat,'longitude' => lon,'timestamp' => date,'altitude' => ele,'segment' => @tracksegs])
end
end
gotlatlon = false
parser.parse
end
+ def points
+ @points.each { |p| yield p }
+ 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
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
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)
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
+ 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
+
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'
@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
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', 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
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
projects / rails.git / blobdiff