X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/92418b7954d8915734f07a66abf76f52b437a517..a8d6714aebfacfc32808a5aca41f6dae785a14cf:/lib/osm.rb diff --git a/lib/osm.rb b/lib/osm.rb index af9608132..adf34684f 100644 --- a/lib/osm.rb +++ b/lib/osm.rb @@ -7,12 +7,62 @@ module OSM # # 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 @@ -73,5 +123,200 @@ module OSM 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 + + 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 end