Hi,
Absolutely not !
(it is always painful to exclude pure GeometryCollections because
MultiPolygon or MultiLineString and MultiPoint are "instanceof"
GeometryCollection
altough their class name is not GeometryCollection).
Thanks for your watchfullness
Michaël
Le 07/12/2015 23:19, Rahkonen Jukka (MML) a écrit :
Hi,
Is it intentional that r4582 does not cut multipolygons and
multilinestrings at all, not even if they have only one part?
-Jukka-
*Lähettäjä:*Michaël Michaud [mailto:m.michael.mich...@orange.fr]
*Lähetetty:* 7. joulukuuta 2015 23:45
*Vastaanottaja:* jump-pilot-devel@lists.sourceforge.net
*Aihe:* Re: [JPP-Devel] CutFeatureTool
Hi Jukka,
Thanks, here are some more improvements :
- polygon/multipolygon case : preserve original geometry if number of
geometries after cutting is still 1
- also GeometryCollection was throwing an exception. Now, it is still
not cut, but it just display a (yellow) warning and let the process go on.
Michaël
Le 07/12/2015 09:08, Rahkonen Jukka (MML) a écrit :
Seems to work right with points and multipoints. It was OK already
in r4578 my Michael. I suppose that the same fix corrected also
another issue of previous versions: If polygons or lines were
selected but the split line did not intersect with any the
selected features were deleted.
Found one more small issue: If polygon is selected and the
splitting line crosses some of the rings but not the whole
polygon, the tool edits the source polygon by adding vertices into
the locations of intersections. Perhaps the tool should check in
some phase the dimensions of the intersection that is computed for
polygons and revert noding if intersection is not an area?
-Jukka-
Giuseppe Aruta wrote:
Hi Jukka,
see OJ 4578. I added a small code to prevent deleting
points/multipoints
Peppe
2015-12-06 23:25 GMT+01:00 Michaël Michaud
<m.michael.mich...@orange.fr <mailto:m.michael.mich...@orange.fr>>:
Hi,
Thanks for the tests Jukka.
Exploding selected multi-geometries even if they are not split
seems
reasonnable.
Problem with points / multi-points should be resolved (they
should be
unmodified)
I found another problem : the tool processed only selected
features of
the first selected layer in the layerNamePanel.
It now processes all selected features, but the undo tool undo
features
from one layer at a time.
Michaël
Le 06/12/2015 22:38, Rahkonen Jukka (MML) a écrit :
> Hi,
>
> Some comments:
>
> - Works well with polygon containing holes
> - Works with multipolygons and multilinestrings
> - Seems to explode multigeometries which may be a surprise
for the user. On the other hand it would be very hard to
define what else to do it multigeometries have many parts and
linestring splits only some of them so I think that "explode
and split" is OK.
> - Tool should check that no point/multipoint geometries are
selected. Now I get "Layer must be editable" error with such
misuse and the selected points are deleted. Undo fortunately
works.
>
> -Jukka Rahkonen-
>
> Michaël Michaud wrote:
>
> Hi Peppe, Jukka,
>
> I just improved CutFeatureTool recently added by Peppe,
>
> - simplified split routines
> - can now split a feature in more than two parts
> - more robust (should remove artefacts noticed by Jukka :
can you confirm ?)
> - more transactional : undo will now un-split all features
splitted durnig an operation
>
> There is still a side effect which is difficult to avoid :
> - if a linestring contains a desired self-intersection (non
simple-linestring), splitting the linestring will node the
self-intersection (splitting uses union op which is noding all
input features).
>
> Michaël
>
> Le 04/12/2015 10:21, Rahkonen Jukka (MML) a écrit :
>> Hi,
>>
>> The tool has good features:
>> - can split many polygons at the same time
>> - splits also linestrings
>>
>> Something to study:
>> - Splitting a polygon with hole through the hole creates
odd geometries. The existing Split polygon with linestring
toold does good job with those.
>> - Splitting multipolygons can create odd geometries.
>>
>> -Jukka Rahkonen-
>>
>>
>>
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