include LibXML
- attr_reader :possible_points
- attr_reader :actual_points
- attr_reader :tracksegs
+ attr_reader :possible_points, :actual_points, :tracksegs
def initialize(file)
@file = file
end
- def points
- return enum_for(:points) unless block_given?
-
- @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
elsif reader.name == "time" && point
point.timestamp = Time.parse(reader.read_string)
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 picture(min_lat, min_lon, max_lat, max_lon, _num_points)
- # frames = 10
+ 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 MimeMagic.by_magic(io)&.type
+ 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)
+ nframes = 10
width = 250
height = 250
+ delay = 50
+
+ points_per_frame = (num_points.to_f / nframes).ceil
+
proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height)
- # TODO: create animated gif
- # https://github.com/openstreetmap/openstreetmap-website/issues/281
- image = GD2::Image::IndexedColor.new(width, height)
+ frames = []
- black = image.palette.allocate(GD2::Color[0, 0, 0])
- white = image.palette.allocate(GD2::Color[255, 255, 255])
+ (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])
- image.draw do |pen|
- pen.color = white
- pen.rectangle(0, 0, width, height, true)
- end
+ frames[n].draw do |pen|
+ pen.color = white
+ pen.rectangle(0, 0, width, height, true)
+ end
- image.draw do |pen|
- pen.color = black
- pen.anti_aliasing = true
- pen.dont_blend = false
+ 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
- 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)
- pen.line(px, py, oldpx, oldpy) unless first
+ if (pt >= (points_per_frame * n)) && (pt <= (points_per_frame * (n + 1)))
+ pen.thickness = 3
+ pen.color = black
+ else
+ pen.thickness = 1
+ pen.color = grey
+ end
- first = false
- oldpy = py
- oldpx = px
+ pen.line(px, py, oldpx, oldpy) unless first
+ first = false
+ oldpy = py
+ oldpx = px
+ end
end
end
- image.gif
+ image = GD2::AnimatedGif.new
+ image.add(frames.first)
+ frames.each do |frame|
+ image.add(frame, :delay => delay)
+ end
+ image.end
+
+ output = StringIO.new
+ image.export(output)
+ output.read
end
def icon(min_lat, min_lon, max_lat, max_lon)