Ah, ok I recall the stuff.
I do not know of a library to read GPX files written in C or C++. In the first place you need an XML parser and writer. There are libraries for that task. Qt has one, too. That's what I use in QMS. Of course you can extract the code from QMS. But the GPX and track classes and their sub-classes are quite some beasts. After all tracks are incredible complex GIS items. So you might end up like Karl, writing your own track filter in QMS. By that you can focus on the task without dealing too much with GPX, drawing stuff etc.. Oliver Am Dienstag, 13. März 2018, 14:07:43 CET schrieben Sie: > -------- Weitergeleitete Nachricht -------- > Betreff: Fwd: Re: [Qlandkartegt-users] Shift the Startpoint from a > track to another point; Programming an own tool > Datum: Tue, 13 Mar 2018 14:03:35 +0100 > Von: APM <apschwim...@apmland.de> > An: Qmapshack mailing list <qlandkartegt-users@lists.sourceforge.net> > > > > Note: I got a SMTP error for my first mail, second try. > > Hi Oliver, > > > yes of course! > > We mainly use circle hiking paths, the tracks are given. The track > starts and end at the same point. > > But from time to time we start and finish at another point on the circle. > > Problem: If I use my Garmin GPS with this track, the "journey-computer" > (in German menue 'Reisecomputer') shows me the remaining distance and > time to the end of the track, which is not the endpoint we really have > and the remaining distance and time are 'wrong'. > > My idea is to manipulate the track in this way, that I define a new > startpoint and the c++ programm change the trackpoints in accordance to > the new startpoint. > > So far as I know, the Garmin GPS can't do a shift of a startpoint from a > track. > > > Kind regards > > > Axel > > Am 13.03.2018 um 12:57 schrieb Oliver Eichler: > > Can you explain again what you want to do? It sounds like moving > > trackpoints without changing the timestamp or other properties. > > > > Oliver > > > >> Gesendet: Dienstag, 13. März 2018 um 10:09 Uhr > >> Von: APM <apschwim...@apmland.de> > >> An: "Qmapshack mailing list" <qlandkartegt-users@lists.sourceforge.net> > >> Betreff: [Qlandkartegt-users] Shift the Startpoint from a track to > >> another point; Programming an own tool > >> > >> Dear all, > >> > >> for a couple of month I asked in this list how to shift a startpoint > >> from a given track without to cut and assemble the track. > >> > >> It's a pity, but I have no solution until now or do not understand what > >> to do in this case. > >> > >> My idea is to progamm a tool in C++ of my own, but I'm inexperienced. > >> > >> My question is, if there's a class in the libary I can use or maybe a > >> similar tool is already present? > >> > >> > >> Thank you very much! > >> > >> > >> Kind regards > >> > >> > >> Axel > >> > >> > >> > >> > >> ------------------------------------------------------------------------- > >> ----- Check out the vibrant tech community on one of the world's most > >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot > >> _______________________________________________ > >> Qlandkartegt-users mailing list > >> Qlandkartegt-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users > > > > -------------------------------------------------------------------------- > > ---- Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Qlandkartegt-users mailing list > > Qlandkartegt-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Qlandkartegt-users mailing list Qlandkartegt-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users
