include LibXML
- attr_reader :possible_points
- attr_reader :actual_points
- attr_reader :tracksegs
+ attr_reader :possible_points, :actual_points, :tracksegs
- def initialize(file)
+ def initialize(file, options = {})
@file = file
+ @maximum_points = options[:maximum_points] || Float::INFINITY
end
- def points
- @possible_points = 0
- @actual_points = 0
- @tracksegs = 0
-
- @file.rewind
-
- reader = XML::Reader.io(@file)
-
+ def parse_file(reader)
point = nil
while reader.read
- if reader.node_type == XML::Reader::TYPE_ELEMENT
+ case reader.node_type
+ when XML::Reader::TYPE_ELEMENT
if reader.name == "trkpt"
point = TrkPt.new(@tracksegs, reader["lat"].to_f, reader["lon"].to_f)
@possible_points += 1
+ raise FileTooBigError if @possible_points > @maximum_points
elsif reader.name == "ele" && point
point.altitude = reader.read_string.to_f
elsif reader.name == "time" && point
- point.timestamp = DateTime.parse(reader.read_string)
+ point.timestamp = Time.parse(reader.read_string).utc
end
- elsif reader.node_type == XML::Reader::TYPE_END_ELEMENT
+ when XML::Reader::TYPE_END_ELEMENT
if reader.name == "trkpt" && point && point.valid?
point.altitude ||= 0
yield point
end
end
+ def points(&block)
+ return enum_for(:points) unless block
+
+ @possible_points = 0
+ @actual_points = 0
+ @tracksegs = 0
+
+ begin
+ Archive::Reader.open_filename(@file).each_entry_with_data do |entry, data|
+ parse_file(XML::Reader.string(data), &block) if entry.regular?
+ end
+ rescue Archive::Error
+ io = ::File.open(@file)
+
+ case Marcel::MimeType.for(io)
+ when "application/gzip" then io = Zlib::GzipReader.open(@file)
+ when "application/x-bzip" then io = Bzip2::FFI::Reader.open(@file)
+ end
+
+ parse_file(XML::Reader.io(io), &block)
+ end
+ end
+
def picture(min_lat, min_lon, max_lat, max_lon, num_points)
- frames = 10
+ nframes = 10
width = 250
height = 250
- proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height)
+ delay = 50
+
+ points_per_frame = (num_points.to_f / nframes).ceil
- linegc = Magick::Draw.new
- linegc.stroke_linejoin('miter')
- linegc.stroke_width(1)
- linegc.stroke('#BBBBBB')
- linegc.fill('#BBBBBB')
+ proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height)
- highlightgc = Magick::Draw.new
- highlightgc.stroke_linejoin('miter')
- highlightgc.stroke_width(3)
- highlightgc.stroke('#000000')
- highlightgc.fill('#000000')
+ frames = []
- images = []
+ (0...nframes).each do |n|
+ frames[n] = GD2::Image::IndexedColor.new(width, height)
+ black = frames[n].palette.allocate(GD2::Color[0, 0, 0])
+ white = frames[n].palette.allocate(GD2::Color[255, 255, 255])
+ grey = frames[n].palette.allocate(GD2::Color[187, 187, 187])
- frames.times do
- image = Magick::Image.new(width, height) do |image|
- image.background_color = 'white'
- image.format = 'GIF'
+ frames[n].draw do |pen|
+ pen.color = white
+ pen.rectangle(0, 0, width, height, true)
end
- images << image
- end
+ frames[n].draw do |pen|
+ pen.color = black
+ pen.anti_aliasing = true
+ pen.dont_blend = false
- oldpx = 0.0
- oldpy = 0.0
+ oldpx = 0.0
+ oldpy = 0.0
- first = true
+ first = true
- m = 0
- mm = 0
- points do |p|
- px = proj.x(p.longitude)
- py = proj.y(p.latitude)
+ points.each_with_index do |p, pt|
+ px = proj.x(p.longitude)
+ py = proj.y(p.latitude)
- if m > 0
- frames.times do |n|
- if n == mm
- gc = highlightgc.dup
+ if (pt >= (points_per_frame * n)) && (pt <= (points_per_frame * (n + 1)))
+ pen.thickness = 3
+ pen.color = black
else
- gc = linegc.dup
+ pen.thickness = 1
+ pen.color = grey
end
- gc.line(px, py, oldpx, oldpy)
-
- gc.draw(images[n])
+ pen.line(px, py, oldpx, oldpy) unless first
+ first = false
+ oldpy = py
+ oldpx = px
end
end
-
- m += 1
- if m > num_points.to_f / frames.to_f * (mm + 1)
- mm += 1
- end
-
- oldpy = py
- oldpx = px
end
- il = Magick::ImageList.new
-
- images.each do |f|
- il << f
+ image = GD2::AnimatedGif.new
+ image.add(frames.first)
+ frames.each do |frame|
+ image.add(frame, :delay => delay)
end
+ image.end
- il.delay = 50
- il.format = 'GIF'
-
- il.to_blob
+ output = StringIO.new
+ image.export(output)
+ output
end
def icon(min_lat, min_lon, max_lat, max_lon)
height = 50
proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height)
- gc = Magick::Draw.new
- gc.stroke_linejoin('miter')
- gc.stroke_width(1)
- gc.stroke('#000000')
- gc.fill('#000000')
+ image = GD2::Image::IndexedColor.new(width, height)
+
+ black = image.palette.allocate(GD2::Color[0, 0, 0])
+ white = image.palette.allocate(GD2::Color[255, 255, 255])
- image = Magick::Image.new(width, height) do |image|
- image.background_color = 'white'
- image.format = 'GIF'
+ image.draw do |pen|
+ pen.color = white
+ pen.rectangle(0, 0, width, height, true)
end
- oldpx = 0.0
- oldpy = 0.0
+ image.draw do |pen|
+ pen.color = black
+ pen.anti_aliasing = true
+ pen.dont_blend = false
- first = true
+ oldpx = 0.0
+ oldpy = 0.0
- points do |p|
- px = proj.x(p.longitude)
- py = proj.y(p.latitude)
+ first = true
- gc.dup.line(px, py, oldpx, oldpy).draw(image) unless first
+ points do |p|
+ px = proj.x(p.longitude)
+ py = proj.y(p.latitude)
- first = false
- oldpy = py
- oldpx = px
+ pen.line(px, py, oldpx, oldpy) unless first
+
+ first = false
+ oldpy = py
+ oldpx = px
+ end
end
- image.to_blob
+ StringIO.new(image.gif)
end
end
- private
-
- class TrkPt < Struct.new(:segment, :latitude, :longitude, :altitude, :timestamp)
+ TrkPt = Struct.new(:segment, :latitude, :longitude, :altitude, :timestamp) do
def valid?
latitude && longitude && timestamp &&
latitude >= -90 && latitude <= 90 &&
longitude >= -180 && longitude <= 180
end
end
+
+ class FileTooBigError < RuntimeError
+ def initialise
+ super("GPX File contains too many points")
+ end
+ end
end
projects / rails.git / blobdiff