95e5178bfb
This avoids constructing xml by hand in both the controller and the model, and opens the way for other rendering in future. The complexity of deciding which point goes where, along with revisiting previous tracks and tracksegs means that I've broken it down into two parts - sorting the points into the right trksegs is done first, before rendering them all as xml. I couldn't find a way to allow revisiting using the builder.
79 lines
2 KiB
Ruby
79 lines
2 KiB
Ruby
xml.instruct!
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xml.gpx("version" => "1.0",
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"creator" => "OpenStreetMap.org",
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"xmlns" => "http://www.topografix.com/GPX/1/0") do
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# initialise these variables outside of the loop so that they
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# stay in scope and don't get free'd up by the GC during the
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# loop.
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gpx_id = -1
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trackid = -1
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tracks = []
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track = nil
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trkseg = nil
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anon_track = nil
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anon_trkseg = nil
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@points.each do |point|
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if gpx_id != point.gpx_id
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gpx_id = point.gpx_id
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trackid = -1
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if point.trace.trackable?
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track = {}
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track["trksegs"] = []
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tracks << track
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if point.trace.identifiable?
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track["name"] = point.trace.name
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track["desc"] = point.trace.description
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track["url"] = url_for(:controller => "/traces", :action => "show", :display_name => point.trace.user.display_name, :id => point.trace.id)
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end
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else
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# use the anonymous track segment if the user hasn't allowed
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# their GPX points to be tracked.
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if anon_track.nil?
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anon_track = {}
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anon_track["trksegs"] = []
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tracks << anon_track
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end
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track = anon_track
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end
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end
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if trackid != point.trackid
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if point.trace.trackable?
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trkseg = []
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track["trksegs"] << trkseg
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trackid = point.trackid
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else
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if anon_trkseg.nil?
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anon_trkseg = []
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anon_track["trksegs"] << anon_trkseg
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end
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trkseg = anon_trkseg
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end
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end
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trkseg << point
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end
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tracks.each do |trk|
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xml.trk do
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if trk.key?("name")
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xml.name trk["name"]
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xml.desc trk["desc"]
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xml.url trk["url"]
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end
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trk["trksegs"].each do |trksg|
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xml.trkseg do
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trksg.each do |tracepoint|
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xml.trkpt("lat" => tracepoint.lat.to_s, "lon" => tracepoint.lon.to_s) do
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xml.time tracepoint.timestamp.xmlschema if tracepoint.trace.trackable?
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end
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end
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end
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end
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end
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end
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end
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