X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/349413a520d05cf9c55fe6870de6ea2f933a3248..59e2349b5a04718fef17e0d8ea18681eb89d3ae8:/lib/osm.rb diff --git a/lib/osm.rb b/lib/osm.rb index 300d9fa7a..bd9351026 100644 --- a/lib/osm.rb +++ b/lib/osm.rb @@ -1,13 +1,6 @@ +# 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' @@ -15,36 +8,51 @@ module OSM 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 - @degrees_per_pixel = 0.0000000001 if @degrees_per_pixel < 0.0000000001 + #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) @@ -63,14 +71,21 @@ module OSM end + # 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']} class GPXImporter # FIXME swap REXML for libXML attr_reader :possible_points attr_reader :actual_points attr_reader :tracksegs - def initialize(filename) - @filename = filename + def initialize(file) + @file = file end def points @@ -86,12 +101,16 @@ module OSM gotele = false gotdate = false - parser = REXML::Parsers::SAX2Parser.new(File.new(@filename)) + @file.rewind + + parser = REXML::Parsers::SAX2Parser.new(@file) parser.listen( :start_element, %w{ trkpt }) do |uri,localname,qname,attributes| lat = attributes['lat'].to_f lon = attributes['lon'].to_f gotlatlon = true + gotele = false + gotdate = false @possible_points += 1 end @@ -135,19 +154,29 @@ module OSM 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) + proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height) + + linegc = Magick::Draw.new + linegc.stroke_linejoin('miter') + linegc.stroke_width(1) + linegc.stroke('#BBBBBB') + linegc.fill('#BBBBBB') + + highlightgc = Magick::Draw.new + highlightgc.stroke_linejoin('miter') + highlightgc.stroke_width(3) + highlightgc.stroke('#000000') + highlightgc.fill('#000000') 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 + image = Magick::Image.new(width, height) do |image| + image.background_color = 'white' + image.format = 'GIF' + end + + images << image end oldpx = 0.0 @@ -160,43 +189,39 @@ module OSM 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 + + if m > 0 + frames.times do |n| + if n == mm + gc = highlightgc.dup + else + gc = linegc.dup + end + + gc.line(px, py, oldpx, oldpy) + + gc.draw(images[n]) + end 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 + + 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 + images.each do |f| + il << f end il.delay = 50 il.format = 'GIF' + return il.to_blob end @@ -204,42 +229,36 @@ module OSM #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 = [] + proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height) - gc = Magick::Draw.new + gc = Magick::Draw.new gc.stroke_linejoin('miter') + gc.stroke_width(1) + gc.stroke('#000000') + gc.fill('#000000') + + image = Magick::Image.new(width, height) do |image| + image.background_color = 'white' + image.format = 'GIF' + end 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}" + + gc.dup.line(px, py, oldpx, oldpy).draw(image) 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 + return image.to_blob end end @@ -276,7 +295,7 @@ module OSM 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" @@ -374,7 +393,7 @@ module OSM 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" + 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| @@ -414,11 +433,13 @@ module OSM # 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 * 1000000).round - minlon = (minlon * 1000000).round - maxlat = (maxlat * 1000000).round - maxlon = (maxlon * 1000000).round + 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