Is there a good alternative library that can render maps (and preferable highlight tracks on them)?

Thx

It turned out I had to call clutter_actor_set_reactive() on the map. Not knowing clutter at all, it would have been nice if the champlain docs mentioned this.

But now in gpx-viewer-BZR you can click on the track, to see that point highlighted in the graph. The next thing I want to figure out is how to easily see a plot of 2 combined tracks. I am thinking of only showing tracks that are selected, and allow you to select multiple tracks.  But no idea how other people use gpx-viewer.

1. The missing events.

I am trying to catch click events on the map, idea is that the users clicks a point on the track, and that point is highlighted in the graph.

So reading the GtkChamplain and Champlain documentation, I saw the following:

Get the ChamplainView from the GtkChamplainEmbed widget via the GtkChamplain.Embed::get_view() function, then on the ChamplainView there is a signal (inherited from ClutterActor, but it is also mentioned explicitly in the api documenation) button-release-event and button-press-event.

However, these never ever fire. I also tried the captured-event and the event signal, but no dice.

2. Crash on gtk_main_quit

When I do gtk_main_quit in my program, it crashes.  Looking at the backtrace this crash originates in

• gtk_main_quit()
• gtk_recent_manager_real_changed
• … <snip>..
• g_string_maybe_expand
• g_realloc
• libc_malloc
• _int_malloc

This only happens when I do not use GtkRecentManager, the moment I do gtk_recent_manager_add_item, it won’t crash.

The problem with this crash is, it completely screws up fglrx and causes it to start leaking memory like crazy. (I guess because clutter is never properly closed).

I _realy_ need a solution for this mess.

On a side note, I discovered an odd thing, on my laptop (based around the amd vision platform) I am getting more then 1 1/2 hour more battery life under linux, then I get under windows7. Normally that is the other way around.

One of the problems with GPX-Viewer is that libchamplain gets pretty slow with complex routes that have a lot of points. So I thought, why not try to filter out points?

The idea is simple, if  you have 3 points: A->B->C and if C is just a linear  continuation of A and B we can remove B.

So I wrote a small algorithm that checks if the speed in the latitude and longitude both do not deviate more then 30% (got this by trail and error) then the point in-between is removed. So large speedup or moves should not be removed. I will probably push a lower value to be on the safe side.

This algorithm seems to be working very good; I get a 22% reduction of points and the deviation I see in the updated track and the original track seems to be limited.

Here is a small screenshot showing the largest distance I found, as you can see we are still on the road.

I will look this week if I can find some paper on filtering GPX tracks, it would be nice to also remove false points, sometimes with bad receptions you get very odd points in the track that are clearly wrong, would be nice to remove those. (I got an algorithm for this, but it is not tested and thought out very well)

Forgot to mention, I ignore the elevation for now, it seems to be unreliable. But that is a problem with my Garmin having a very unreliable height measurement.

I should update my site better, as only old versions are visible on it ..

GPX-Viewer is a simple program to view gpx files. It is focussed for viewing files generated why riding my bike. It is simple and ‘just-work’.

Changelog:

• Updated translations
• Fix for bug 448392
• Treeview for switching tracks.
• Improved Playback
• Display number of points and average speed in tracklist.
• Add point list view.
• Add acceleration, elevation speed, etc. graph.
• Add recent file support
• Show scale in graph.
• Add map-type selector.
• Add dock’s and allow them to be moved.
• Indicator that the map is loading data.
• Preferences backend with signal hooks.
• Unique app support.

URL: https://edge.launchpad.net/gpx-viewer/trunk/0.2.0

Download: http://edge.launchpad.net/gpx-viewer/trunk/0.2.0/+download/gpx-viewer-0.2.0.tar.gz (md5)

• Support multiple maps (cycle map, transport map, etc).
• Fix playback
• Show elevation difference/Gradient.
• Recent File support.
• Distance vs. time graph.
• Docks.

I added docks using libgdl, but having some problems.  If somebody can tell me what I am doing wrong?

Problems I am having: 1. Sometimes the dock when dragged is empty (until docked again). 2. Sometimes widgets in the dock are disappearing.

I do think it is some improvement..

Screenshots:

The tracks (now per file) are listed in a treeview instead of drowdown. It also stores window size and pane position.

http://images.sarine.nl/gpx-viewer-24102009.png

It also moves to automake 1.11 with build-in vala support and fixes some wrong dependencies.

You can get it here: http://download.sarine.nl/Programs/GPXViewer/gpxviewer-0.0.7.tar.gz