[GRASS5] Zoom

[Radim Blazek]

Hi,

it was already mentioned in grass list few times, that d.zoom could be 
modified, because I also think so, here is my proposal how to do that:

Prerequisities (for discussion):
1. Most improtant zoom operations: 
   - zoom in by window
   - zoom out by point 
   - pan by point
2. Right button used for "Quit/Go to upper menu". Right button is already
   used for quit by many functions in v.digit. 
3. d.zoom and Zoom in v.digit must be identical.
4. Menu should not have more than 2 levels, more levels are confusing. 
5. No need to ask always user if he realy wants to do what he already
   selected.

Proposed behaviour for d.zoom:

Main menu:
L:Zoom menu  
M:Pan                                
R:Quit                                

Zoom menu - Mode 1:
L: 1. corner + switch to mode 2. 
M: Unzoom
R: Main menu 

Zoom menu - Mode 2: 
L: 1. corner (reset) 
M: 2. corner
R: Main menu  

This (or something better) should be done before 5.0.0 release, I think.

Modified module is here:
http://mpa.itc.it/radim/g50/d.zoom2.tar.gz
and precompiled version for Linux/i386:
http://mpa.itc.it/radim/g50/d.zoom2


Radim