[Xastir] New code testing

[Stephen West-Fisher]

Curt Mills, WE7U wrote:
> On Wed, 23 Jul 2003, Stephen West-Fisher wrote:
> 
> 
>>HSP all the time into a DJ580, magmount antenna on the roof.
>>Yes, the laptop is reliable, but slow.
>>
>>I'll be testing again in my truck later this week on the same routes.
> 
> 
> If you could try it with just the GPS plugged in instead of the
> radio, perhaps creating a Serial GPS interface for the task, that
> might tell us whether the HSP code is at fault.
> 
> 
> 
>>I still think it is the combination of slow laptop/map redraw/low zoom
>>level since a longer trip at higher zoom had no faults. My thoughts are
>>that the map needs redrawn, so a redraw is started. By the time the map
>>redraw is finished, I'm off the edge again. Due to screen aspect ratio
>>this happens more on north/south routes. This really only happens at
>>higher speeds, when I'm on streets at less than about 50mph, it doesn't
>>seem to happen.
> 
> 
> Ok.  It's possible that the TrackMe code needs to initiate a map
> interrupt in this case, so that Xastir can try to keep up.  In that
> case you might not get a complete redraw before you get a map
> interrupt (depending on speed/zoom level/number & type of maps
> selected), so the maps drawn into memory won't even show up on the
> display.  Xastir might appear to be doing nothing, but in fact would
> be frantically drawing maps into a pixmap, then getting interrupted
> before you get to the copy-to-the-display stage, then starting the
> process all over again.  It might alleviate the segfaults you're
> seeing though, so it's probably a step in the right direction.
> 
> There's not a lot we can do about that except suggest running on a
> laptop capable of redrawing in the time allotted.  It seems to me
> that we should do the map draw interrupt in this case though, so
> that Xastir doesn't get bogged down trying to draw maps that you're
> already past, queuing up more maps to load as it goes.
> 
> Another thing we _could_ do is to copy the maps up to the display as
> each map is loaded into memory.  This would slow things down
> slightly overall, but would at least give you partial maps as you
> were going along.  Problem is, if we interrupt the map drawing when
> you get to the edge, you'd never get the weather alerts/ symbols/
> tracks drawn on top of the maps either, so you wouldn't even get to
> see where you were on the map.
> 
> Ideas anyone?
> 

I'm not really conserned about it, so far no problems at zoom level 32 
which is fine for my needs.

But you mentioned something that might be helpful. The moble segfault 
occurs in this manner, a map redraw starts (watch for cursor) after a 
little while, the map disapears, trakme symbol occurs in center of 
screen, and background is background color. No map at all. Then segfault.

-- 
Stephen West-Fisher
Coastal Data Systems
727.418.9774
http://www.coastaldatasystems.com/