Re: MapProjectionDisplay question

Hi Stuart-

Stuart Maclean wrote:
Hi Don, many thanks for the speedy reply.

Well, it was either that or write performance evaluations.  Helping
users is much more rewarding. ;-)

I build a Mercator projection, and set its defaultMapArea with a ProjectionRect (cartesian values, i.e. projected from the lat,lon). I then construct a MapProjectionDisplay and call setMapProjection.

That's the best way to do it.

I have got it all working. This was actually a sort of red herring. I wasn't seeing any Displayables show up, and I was erroneously assuming that my projection logic was wrong. So I looked at the main method in the MapProjectionDisplay (was a life saver, thanks for including it!). I wasn't ever calling the 'draw' method, doh!

Yeah, that draw command used to get me all the time.too!  That's
kind of left over from the old VisAD days when anything you
did to a display caused a redraw.  The idea was that you could
create the DisplayMaster, add all the displayables, then call draw()
which would render everything.  These days, you can add and
remove displayables with much less overhead. In the IDV, we
use the ViewManager classes (wrapper around a DisplayMaster)
to call draw so in most cases it's "automatic".

Don Murray                               UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx                        P.O. Box 3000
(303) 497-8628                              Boulder, CO 80307