Comments on: GPX Viewer

By: Qball

Qball — Sun, 25 Apr 2010 09:43:32 +0000

Plotting height v.s. time has been supported for a while now. Dev. branch has 5 different plots it can show. waiting for libchamplain todo a release.

By: Peter

Peter — Sun, 25 Apr 2010 06:34:48 +0000

Very nice tool!

Maybe an idea for a feature that is relatively simple to add: instead of plotting the speed vs. time, you could have an option to plot the height vs. time.

I did this once for the gpx files coming from my Garmin Etrex Vista (simple gnuplot graphs: see e.g. http://www.peterverthez.net/gps/070603.html). You have to make sure you set the height in the GPS when you start a trip, because it drifts a lot over time (because it’s simply based on barometric measurements). But still, it is very usable, if you also add some smoothing.

(Of course Belgium has some more elevation differences than Holland, so maybe you’re not that interested in that )

By: Qball

Qball — Sat, 27 Mar 2010 23:07:53 +0000

Calculated, My gps does not write down the speed entry in its gpx file. I guess it should be an easy fix to read out the value and if not available calculate it.
Please file a bug.

By: Ian

Ian — Sat, 27 Mar 2010 17:01:24 +0000

It ate my includes too. It read:
In src/gpx-viewer.c, change #include to #include

By: Ian

Ian — Sat, 27 Mar 2010 16:58:38 +0000

Yep, removing the line “default=4″ from src/gpx-graph.vala did the trick. It complied and is now working sans problem on Karmic. And in terms of the clutter include, I think martijn had a typo. This worked for me:
In src/gpx-viewer.c, change “#include ” to “#include ”

I’m wondering: for the speed data, are you taking a discrete derivative of the coordinates? Or does it look for tags too?

This program is exactly what I was looking for, ie. a distance vs. time plot with a map. Thanks for you help.

By: Qball

Qball — Sat, 27 Mar 2010 11:02:29 +0000

Vala’s syntax changed. You can fix it by completely removing the default = 4 from that property definition.

By: Ian

Ian — Sat, 27 Mar 2010 05:15:18 +0000

I would love to get this working on Karmic. I am not terribly knowledgeable compiling this sort of thing. I changed the include and and the library dependency from 0.3 to 0.4, but make is giving me this error:

gpx-graph.vala:54.14-54.14: error: only automatic properties can have default values
default = 4;
^
Compilation failed: 1 error(s), 0 warning(s)
make[2]: *** [gpx_viewer_vala.stamp] Error 1
make[2]: Leaving directory `/home/ihincks/Downloads/gpx-viewer-0.1.2′
make[1]: *** [check-recursive] Error 1
make[1]: Leaving directory `/home/ihincks/Downloads/gpx-viewer-0.1.2′
make: *** [check] Error 2

I would love some help here. Let me know if you need more info.

By: Qball

Qball — Thu, 25 Mar 2010 22:09:14 +0000

Because I do not have time for updating sites, I rather code.

By: martijn

martijn — Thu, 25 Mar 2010 22:04:37 +0000

Ah, might want to put a on it next time .

Bit confusing that 0.1.2 isn’t listed with the downloads? Will try later

By: martijn

martijn — Thu, 25 Mar 2010 22:02:18 +0000

hm. my comment got partially eaten there. the include stuff should read

if I change the #include to #include