Removes duplicate nodes from the geometry, wherever removing the
nodes does not result in a degenerate geometry.
By default, z values are not considered when detecting duplicate
nodes. E.g. two nodes with the same x and y coordinate but
different z values will still be considered duplicate and one
will be removed. If useZValues is true, then the z values are
also tested and nodes with the same x and y but different z
will be maintained.
Note that duplicate nodes are not tested between different
parts of a multipart geometry. E.g. a multipoint geometry
with overlapping points will not be changed by this method.
The function will return true if nodes were removed, or false
if no duplicate nodes were found.
Includes unit tests and a processing algorithm which exposes
this functionality.
when snapping line layers
Because the default behavior of the snapper is to insert extra
vertices into the snapped geometry in order to make it 'follow'
the reference geometries exactly, this can result in unwanted
results for line layers where the resultant snapped layer
has overlapping line segments.
Since we can't always know what the desired result is that the
user wants (maybe they do want overlapping lines), instead
give them control over the result by exposing extra enum
options which never insert extra vertices.
When running algorithms through the toolbox, which have dynamic
numeric parameters, add a data defined property override button
next to the widget so that users can set the overrides for these
parameters.
Previously this was available only in the backend, but not
exposed anywhere in the GUI.
Note that currently no algorithms support dynamic parameters,
so don't expect to see this everywhere. It's also only available
in toolbox/batch processing modes, not in models.
Without this change optional numeric parameters have no way to
be cleared in the GUI - they are always forced to have a value
Fixes#17471 - but I've noticed that many optional numeric
GRASS parameters have a non-null default value. These may
need to be investigated and manually changed to None defaults
in the description files.
Adds a new QGIS processing provider for 3d algorithms, available
only when QGIS is built WITH_3D
Currently includes only a single algorithm for tesselating geometries,
which exposes the functionality of QgsTesselator to processing.
Like the native c++ algorithm provider, algorithms in the 3d
provider are transparently merged with the other QGIS providers
(i.e. they aren't separated into their own group)
