Le 24/06/2011 11:15, edgar.sol...@web.de a écrit :
peppe votes to have the geometry conversion also in the layerview context menu.
as i do not work with gis i don't know how often one needs this functonality.
so i put that up for voting. anybody else in favor or against it?
@michael: your vote on integrating the geomconv into core is still missing.
Hi all,
I have just tested geomconv for the first time. Good work.
Geometry type conversion is a very useful feature.
I agree with peppe that it would be nice to have the menu in layerview
context menu
In my opinion, it would need a bit more work (and translation).
I would vote to include it in 1.4.2 (and I'm ready to help to improve
and to translate it).
Here are my remarks (more or less important, feedback is welcome) :
1) It took me some times to understand the differences with existing
tools like extract points
I would reorganize Edit Geometry convert menu into
- Edit Geometry > Extract (points, boundaries, segments...)
these plugins work on a whole layer and create a new one for the result
- Edit Geometry > Convert (ede's conversion tool)
these plugins work mainly on a selection and modify directly geometries
Note : conversion are undoable, which is a great feature !
2) If no feature is selected, the tool converts the whole layer
This is a useful feature, but It would be nice to warn the user, as the
menu name is convert "selected" geometry
3) Converting polygons with holes or multipolygons into linestrings
create bridges joining linear components
It should be converted int multilinestrings
Why not use *com.vividsolutions.jts.geom.util.LinearComponentExtracter*
In a more general way, I would propose to convert geometries into :
- ponctual, lineal or polygonal geometries
The plugin should choose the best geometry type
- points into punctual -> points
- any other geometry into punctual -> multipoint
- point into lineal : not possible
- multipoint into lineal -> linestring (or linearring if first = last
coordinate)
- linestring into lineal -> linestring
- polygon without hole into lineal -> linear ring
- polygon with holes or multipolygons into lineal -> multilinestring
- point into polygonal -> not possible
- linestring into polygonal -> polygon if closed (option to close it ?)
- multilinestring into polygon -> polygon or multipolygon (may be
difficlut to find interior rings and exterior rings, I have some code
for that)
4) Missing coversion of polygons with holes and multi-polygons into
multilinestring
Possible improvements :
5) The tool works on a per feature basis. It means that a "linestring"
cannot be converted into a "point". It may be useful, but it is not
always intuitive. I would like an option like "authorize conversion of
one feature into several". Just an idea for improvement, not a requirement.
If neither a multipoint nor a linestring, nor a polygon can be converted
to a point ("Too many points selected. Only one point needed") what can
the "convert to point" plugin do ?
6) Converting linearring into multipoints keeps the starting and the
ending point (it's OK as the default behaviour, but an option as the one
in extract points would be welcome)
Converting multipoints into linear ring fails if last point is not
equals to first one (it's OK as the default behaviour, but an option to
close the line would be welcome)
7) Missing conversion of multi linear rings into polygons or
multi-polygons (not easy)
Hope it helps
regards ede
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