[GRASS-dev] PROPOSAL: v.edit WAS: d.* commands

[Michael Barton]

These would be very good functions to build in. The undo, would probably
best be implemented in the GUI/display management system. It could store up
changes and implement them on command. I'm not sure how this could be done,
but it probably could be.

Michael


On 5/24/06 9:01 PM, "Trevor Wiens" <twiens at interbaun.com> wrote:

> On Wed, 24 May 2006 20:50:20 -0700
> Michael Barton <michael.barton at asu.edu> wrote:
> 
>> This is along the lines of what I thought would be a good replacement for
>> v.digit. Glynn had some ideas too, so I hope he offers an opinion here. This
>> kind of command line module for modifying vector objects could then be
>> accessed by any GUI/display management system that could draw on a display,
>> capture coordinates, and pass them to the relevant vector. The on-screen
>> vector could then be redrawn to reflect the change.
>> 
> 
> Would this type of implementation also allow for adding functions like
> joining polygons in a digitizing window environment. This might be
> really elegant if one could specify which of the two or more objects
> attributes of the objects being merged would be retained. Right, AFAIK
> we need to manually delete the common boundary and one of the
> centroids. Since there is a function to dissolve common boundaries in
> v.extract, perhaps this might be a nice addition. I've used v.reclass
> and v.extract for this, but sometimes it is necessary to do some of
> this interactively. I suppose I could assign attributes accordingly and
> then extract to dissolve, but it would be nice to do this interactively.
> 
> Also, it would be really nice to have an undo function built in. I find
> using v.digit very frustrating because I can't just "undo" my mistakes
> or exit without saving.
> 
>> On 5/24/06 2:49 PM, "Wolf Bergenheim" <wolf+grass at bergenheim.net> wrote:
>> 
>>> On Wed, 24 May 2006, Michael Barton wrote:
>>>>> 
>>>>> If this is something that I can do, I would like to try and get a few
>>>>> of the more important ones updated before the feature freeze. I am not
>>>>> a great C coder, however, so this could get ugly.
>>>> 
>>>> Thanks very much for offering to help. IMHO, the most valuable thing anyone
>>>> could do to make GRASS 6.2 a complete system would be to port i.points
>>>> and/or v.digit to the new architecture so that they could work in a TclTk
>>>> canvas rather than requiring X11. NVIZ seems already on track to get there
>>>> soon.
>>>> 
>>> 
>>> How about making a v.edit that would work a bit like this:
>>> 
>>> v.edit task=[add,del,move,etc..] what=[point,line,centroid]
>>>         db=[an SQL statement for UPDATE
>>>         args=[task and what specific]
>>> 
>>> so for example to add a new point one could call
>>> 
>>> v.edit task=add what=point db='name="survey location 73" depth=34'
>>> args=x=25.242424,y=34.45634
>>> 
>>> and to add a line one could call
>>> 
>>> v.edit task=add what=line db='name="road #73" speed=70'
>>> args=25.242424:34.45634,25.34343:34.34353,25.6754:34.6453
>>> 
>>> delete is trivial
>>> 
>>> v.edit task=del what=line args=345
>>> ^This is the cat ID.
>>> 
>>> Just as an idea. If you like this I can start working on defining the
>>> syntax so that one can edit all sorts of shapes. Another possibility would
>>> be that it would read commands from a file (or stdin). Which would you
>>> guys prefer?
>>> 
>>> If reading from a file then the syntax can be more complex (even XML if we
>>> want it to).
>>> 
>>> --Wolf
>> 
>> ___________________________
>> Michael Barton, Professor of Anthropology
>> School of Human Evolution & Social Change
>> Center for Social Dynamics & Complexity
>> Arizona State University
>> 
>> WWW - http://www.public.asu.edu/~cmbarton
>> Phone: 480-965-6262
>> Fax: 480-965-7671
>> 
>> _______________________________________________
>> grass-dev mailing list
>> grass-dev at grass.itc.it
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> 

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

WWW - http://www.public.asu.edu/~cmbarton
Phone: 480-965-6262
Fax: 480-965-7671