#
# 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 'RMagick'
+
+ 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
+ @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)
+
+ 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)))
+ end
+
+ def xsheet(lon)
+ lon
+ end
+
+ #and these two will give you the right points on your image. all the constants can be reduced to speed things up. FIXME
+
+ def y(lat)
+ return @height - ((ysheet(lat) - @ty) / (@by - @ty) * @height)
+ end
+
+ def x(lon)
+ return ((xsheet(lon) - @tx) / (@bx - @tx) * @width)
+ end
+ end
+
class GPXImporter
+ # FIXME swap REXML for libXML
attr_reader :possible_points
attr_reader :actual_points
attr_reader :tracksegs
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
+ 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
+ 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)
+ 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
+ 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 GeoRSS
+ def initialize(description='OpenStreetMap GPS 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 << 'OpenStreetMap GPS Traces'
+ @channel << title
+ description_el = XML::Node.new 'description'
+ @channel << description_el
+
+ description_el << description
+ link = XML::Node.new 'link'
+ link << 'http://www.openstreetmap.org/traces/'
+ @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'
+ 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 << 'http://www.openstreetmap.org/traces/'
+ 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)
+ item = XML::Node.new 'item'
+
+ title = XML::Node.new 'title'
+ item << title
+ title << title_text
+ link = XML::Node.new 'link'
+ link << url
+ item << link
+
+ description = XML::Node.new 'description'
+ description << description_text
+ item << description
+
+ pubDate = XML::Node.new 'pubDate'
+ pubDate << timestamp.xmlschema
+ item << pubDate
+
+ lat_el = XML::Node.new 'geo:lat'
+ lat_el << latitude.to_s
+ item << lat_el
+
+ lon_el = XML::Node.new 'geo:lon'
+ lon_el << longitude.to_s
+ item << lon_el
+
+ @channel << item
+ end
+
+ def to_s
+ return @doc.to_s
+ end
end
end
projects / rails.git / blobdiff