+# 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 '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)
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
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
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
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
#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
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"
return "#{tilesql} AND #{prefix}latitude BETWEEN #{minlat} AND #{maxlat} AND #{prefix}longitude BETWEEN #{minlon} AND #{maxlon}"
end
+
+
end
projects / rails.git / blobdiff