[GRASS5] gis.m limitation

[Michael Barton]

Cedric,

Unless there is a lot more changed than is clear here, it is a mistake to
remove the zoom to current region button. The standard display button IS
acting incorrectly as you describe it below, but didn't behave that way
previous to recent changes in display architecture. The left button should
never respect the generic region (set by g.region from the shell) but only
respect the region specific to that particular display.

Let me explain. Each display monitor needs to have an independent region
setting. That is, you should be able to zoom to one resolution and extents
in one display and a different resolution and extents in another. This is
the reason for the zoom to current region button. A particular display
should adopt the current region setting (i.e., generically set with
g.region) only if you explicitly tell it to do so. Otherwise, its region
settings should be completely independent of any other display. That is why
each display has its own saved region (mon1, mon2, etc). This makes it
possible to show a region in one display and the close up of a city in
another. In the same way, each display has its own independent layer tree
and can show a different set of maps from any other display.

I fear that you have changed it so that all displays now have the same
region settings. If so, it needs to be changed back.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics and Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton


> From: Cedric Shock <cedricgrass at shockfamily.net>
> Date: Wed, 3 May 2006 11:46:25 -0700
> To: <grass5 at grass.itc.it>
> Cc: Trevor Wiens <twiens at interbaun.com>, Michael Barton
> <michael.barton at asu.edu>
> Subject: Re: [GRASS5] gis.m limitation
> 
> Trevor,
> 
> It's fixed in CVS. There's no need for the zoom to current region button
> anymore; I removed it.
> 
> -- Cedric
> 
>>> On of the short comings with gis.m that I now find is that it is
>>> impossible to zoom to a file with the new interface since shell
>>> commands no longer affect the current window.
>> 
>> Shell commands do affect the region, which affects the window if it is
>> redrawn. Currently there are two redraw buttons. The one on the left draws
>> changes in layers. The one on the redraws everything and will draw
>> correctly if the region has been changed.
>> 
>> I imagine that if I change the region and change a layer and use the left
>> redraw button I'll get two layers rendered at different regions which is a
>> bug. I just tried this and indeed it is so.
>> 
>> The correct thing for us to do is have one redraw button and a belief state
>> about the region. If the region is not in our belief state we should assert
>> that the layers are dirty and must be redrawn.
>> 
>> --Cedric
>> 
>> _______________________________________________
>> grass5 mailing list
>> grass5 at grass.itc.it
>> http://grass.itc.it/mailman/listinfo/grass5