[GRASS5] zoom and pan in v.digit (was raster map file format)

[Daniel Calvelo Aros]

How about introducing a "stack of WIND settings" from which you can pop
previous settings and push new settings, and maybe select them from a list?
Then, assuming d.view.pop and d.view.push commands, not only v.digit could
push on entering and popping on leaving, but I guess other users/scripts would
benefit.

It would be just a kind of versioning system for the WIND file, wouldn't it?

-- Daniel Calvelo Aros

---------- Original Message -----------
From: Glynn Clements <glynn at gclements.plus.com>
To: Michael Barton <michael.barton at asu.edu>
Cc: grass5 at grass.itc.it
Sent: Mon, 7 Nov 2005 21:11:23 +0000
Subject: Re: [GRASS5] zoom and pan in v.digit (was raster map file format)

> Michael Barton wrote:
> 
> > I'd like to add, a bit different from what Maciek suggests, that any zooming
> > OR panning in v.digit should stay in v.digit and have no effect on the
> > region for display or analysis outside of v.digit.
> 
> v.digit does this so that any external commands which it invokes use
> the same region settings as v.digit.
> 
> AFAICT, there are two cases, both in display.c:
> 
> 1. display_bg() executes a sequence of user-specified commands to 
> draw the background.
> 
> 2. display_erase() executes d.erase to erase the background.
> 
> The second is gratuitous; it should just erase the background itself.
> 
> However, there's no getting around the former; the only way to make 
> an external command use a specific region is to modify the WIND file.
> 
> One option is to save the WIND file prior to executing the commands
> then restore them afterwards.
> 
> Another option would be to modify G_get_window() so that you can 
> force it to read a different file by using an environment variable. 
> Then,
> v.digit could write the modified region to a temporary file and 
> force the background commands to use that via the environment variable.
> 
> In either case, the auto-redraw feature won't work, as the commands
> will get the normal region rather than v.digit's internal version.
> 
> -- 
> Glynn Clements <glynn at gclements.plus.com>
> 
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------- End of Original Message -------