[Qgis-user] Re: delete ring/part search radius

Mon Nov 30 16:37:19 PST 2009

Hi Giovanni and list

I had noticed this also and made a remark about it on an e-mail dated
September 2 (the thread is in the end of this message). I got a reply
from Richard Kostecky (I presume he was the dev behind the vector
editing overhaul) saying that he would change this unexpected
behaviour for next version... I don't know if he did get around to
change it yet.

The mentioned September 2 e-mails follow (sorry for the bad formatting):

Hello list
Having installed QGIS1.2.0 and done some trial digitizing I just want
to leave here some remarks of my experience:

- Overall experience: Great. Especially the new undo/redo capability
is really useful. Excellent job!

- The whole digitizing process feels a lot more robust now. I'm not
afraid to crash QGIS everytime I make an edit as was usual for me some
releases back :)

- I'd like to propose adding the "Numerical Vertex Edit" plugin to the
main QGIS code base. I use it regularly for precise placement of
points and it would be a good enhancement to the digitizing toolbar
IMO.

- I noticed some small inconsistencies in the UI:

1. The button for adding a new part to a polygon is called "Add
Island", but the button to remove it is called "Remove Part". They
should be using the same name, be it island or part.

2. when digitizing polygons, some tools allow you to click anywhere
inside the polygon you want to edit while others expect you to click
on the vertices.
To clarify:
2.1. Say I made a new polygon and now want to move it somewhere.
2.2. As expected, I select the adequate tool and then click anywhere
inside my new polygon to drag it wherever I want.
2.3. Now suppose I created a new part for my polygon (It's great to
have that message asking me to select the polygon first ;)).
2.4. Later I change my mind and try to delete this new part. The
expected behaviour would be to select the adequate tool and then click
anywhere inside the part in order to delete it. This doesn't work, and
pops up the familiar "Could not snap segment" message. The way to make
it work is clicking on some vertice of the part I wish to delete,
which does the trick of deleting the whole part. This is not very
intuitive. Besides that, if the vertice is shared by other polygons
they all get deleted (which is where the undo functionality comes to
the rescue).

3. When digitizing point and line layers the "Delete part" button
should be greyed out, as it doesn't do anything

4. Using the "gis" icon theme, the "copy features" icon that shows up
in the digitizing toolbar is too grey. It is easily mistaken for a
disabled tool. I think it should be a bit darker.

Thanks again!

reply from Richard Kostecky:

Hello

at first it's good to know that someone appreciate changes.

On Wed, Sep 2, 2009 at 1:21 PM, Ricardo Filipe Soares Garcia da
<ricardo.garcia.silva at gmail.com> wrote:

    Hello list
    Having installed QGIS1.2.0 and done some trial digitizing I just want
    to leave here some remarks of my experience:

    - Overall experience: Great. Especially the new undo/redo capability
    is really useful. Excellent job!

    - The whole digitizing process feels a lot more robust now. I'm not
    afraid to crash QGIS everytime I make an edit as was usual for me some
    releases back :)

    - I'd like to propose adding the "Numerical Vertex Edit" plugin to the
    main QGIS code base. I use it regularly for precise placement of
    points and it would be a good enhancement to the digitizing toolbar
    IMO.

    - I noticed some small inconsistencies in the UI:

    1. The button for adding a new part to a polygon is called "Add
    Island", but the button to remove it is called "Remove Part". They
    should be using the same name, be it island or part.

For this I have a simple explanation. Adding island is only to add
"part" in this case island to polygon. And it's only action provided
directly by QGIS which creates multi part geometry. Tool Remove Part
was introduces because it works not only with polygons but is able to
delete also part of multi-point or multi-line feature. As I know QGIS
isn't able to create them, but they can be already in some shapefiles,
so it's good to be able to delete part of it. That's just reason why
it's called remove part and it's not deactivated on point or line
geometries.

    2. when digitizing polygons, some tools allow you to click anywhere
    inside the polygon you want to edit while others expect you to click
    on the vertices.
    To clarify:
    2.1. Say I made a new polygon and now want to move it somewhere.
    2.2. As expected, I select the adequate tool and then click anywhere
    inside my new polygon to drag it wherever I want.
    2.3. Now suppose I created a new part for my polygon (It's great to
    have that message asking me to select the polygon first ;)).
    2.4. Later I change my mind and try to delete this new part. The
    expected behaviour would be to select the adequate tool and then click
    anywhere inside the part in order to delete it. This doesn't work, and
    pops up the familiar "Could not snap segment" message. The way to make
    it work is clicking on some vertice of the part I wish to delete,
    which does the trick of deleting the whole part. This is not very
    intuitive. Besides that, if the vertice is shared by other polygons
    they all get deleted (which is where the undo functionality comes to
    the rescue).

I'm sorry that's my problem I'll think about it and provide change
probably to next version.

On Mon, Nov 30, 2009 at 10:44 PM, Giovanni Manghi
<giovanni.manghi at gmail.com> wrote:
>
>> I noticed that the "delete ring/part" tool sensitivity is taken from the
>> "search radius for vertex edits" configuration in the qgis options. Is
>> this on purpose?
>
>
> Hi, can someone confirm the above question?
>
> thanks in advance
>
> -- Giovanni --
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-user
>

-- 
___________________________ ___ __
Ricardo Garcia Silva