[GRASSLIST:9952] v.digit additions

[Ralf Gerlich]

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
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