[GRASSLIST:9972] Re: v.digit additions

[Michael Barton]

These sound like very helpful additions.

Since you are looking at v.digit, I'd like to ask if it looks like v.digit
can be modified so that it doesn't require an x-display to run?

Michael
______________________________
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ  85287-2402
USA

voice: 480-965-6262; fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton


> From: Ralf Gerlich <ralf.gerlich at bsse.biz>
> Date: Mon, 23 Jan 2006 12:48:56 +0100
> To: GRASSLIST <grasslist at baylor.edu>
> Subject: [GRASSLIST:9952] v.digit additions
> 
> Hello,
> 
> I have created some additions to v.digit, namely
> 
> 1. the possibility to change the width of displayed lines in the
> settings dialog,
> 2. a tool for continuous appending of points to a previously closed
> line, and
> 3. a tool for copying categories between features.
> 
> I have attached the separated patches in a tar.gz together with the
> additional icons.
> 
> ad 1.
> =====
> 
> On some raster maps the 1-pixel wide lines and point-markers are hard to
> see, even when changing the colors. This patch enables setting of the
> width of such lines in the settings dialog.
> 
> The patch is a bit quick-and-dirty, but worked fine so far.
> 
> ad 2.
> =====
> 
> When digitising large objects on a large scale, these objects tend to
> cross the display border. In that case, one has to stop digitising the
> line or boundary, pan the view and continue editing. While "add vertex"
> allows for adding vertices anywhere in the line, it is tedious to use
> when continuing at the end, as for any additional vertex two clicks are
> necessary.
> 
> Simply starting with a new line adds an additional node where none is
> topologically required and in case of many occurrences of such nodes
> may, e.g., prevent "v.clean tool=prune" from doing proper simplification
> (which is important for my application of creating custom scenery for
> the open source flight simulator FlightGear)
> 
> The "edit line" tool allows the user to select one end of a line and
> continue editing as if the line was newly created, including deletion of
> previous vertices using button 2 up to the first vertex, resulting in
> the deletion of the line.
> 
> ad 3.
> =====
> 
> When digitising discontinuous but related features it may be desirable
> for the parts to have the same categories, pointing to the same table rows.
> 
> I am now in a situation where I have a considerable data set with
> related features being assigned different categories. The "copy
> categories" tool allows you to copy the categories of one feature to
> another. Simply select the source feature and the target feature and
> confirm by clicking once with button 1. The categories are copied from
> source to target and the old categories of the target are deleted using
> check_record(). The old target becomes the new source and you can select
> a new target by the next click with button 1.
> 
> =====
> 
> I am not sure if any of this is actually useful for others and whether I
> did these things the right way, but I tought, I'd share them.
> 
> Best Regards,
> Ralf