Re: [Qlandkartegt-users] User definable track filtering?

[Michael K. <mic...@pu...>]

On Fri, 23 Sep 2011, Michael Klein wrote:

> Attached is also a simple implementation of the Douglas-Peucker algorithm in 
> Lua. Filtering a track with 3000 points takes only a few seconds on my dated 
> G4 Powerbook, and it seems most of the time is actually spent in 
> track.rebuild() *after* the Lua work. So performance is IMHO no showstopper.

the reason for track.rebuild() being rather slow is actually a Qt/Mac 
deficiency, where QDateTime::toString(Qt::TextDate) if rather expensive.

I filed a bug: https://bugreports.qt.nokia.com/browse/QTBUG-21678

-- 
Michael

fjelljo.puffin.lb.shuttle.de:~ > uptime
23:27  up 3 days,  4:17, 4 users, load averages: 0.79 1.25 0.89