Adds a native k-means clustering algorithm.
Based on a port of PostGIS' ST_ClusterKMeans function, this
new algorithm adds a new cluster ID field to a set of input
features identify the feature's cluster based on the k-means
clustering approach. If non-point geometries are used as input,
the clustering is based off the centroid of the input geometries.
bool(obj) in Python has the following semantics:
1. if the object has __bool__() method, return its value
2. if the object has __len__() method, return its value
3. return True
So for objects in QGIS API that implement __len__() method, we were getting
unexpected behavior - for example, "if layer: ..." would evaluate as False
in case the layer was empty, while the usual expectation is that any reference
to an object that is not None should evaluate to True.
- Adding datasets to mesh layer from properties panel
- Information and source panel in properties panel
- Selection of active dataset (properties or styling panel)
- Styling of contours/scalars (properties or styling panel)
- Styling of mesh frame (properties or styling panel)
- Styling of vector arrows (properties or styling panel)
Converts a raster layer into a vector layer, with a polygon feature
corresponding to each pixel from the raster and a single field
containing the band value from the raster.
Sponsored by SMEC/SJ
It turns out that an empty QComboBox evaluates to False:
>>> t=QLineEdit()
>>> bool(t)
True
>>> c=QComboBox()
>>> bool(c)
False
Due to that, the 'TABLE' parameter was missing if its (editable) combo box was empty.
Original error - while updating an algorithm's parameters (gdal:importvectorintopostgisdatabaseavailableconnections)
Traceback (most recent call last):
File "/home/martin/qgis/git-master/build-debug/output/python/plugins/processing/algs/gdal/GdalAlgorithmDialog.py", line 121, in parametersHaveChanged
or (not p.checkValueIsAcceptable(parameters[p.name()])):
KeyError: 'TABLE'
existing folder match for a path
E.g. if \a path is "/home/user/projects/2018/P4343"
and "/home/user/projects" exists but no "2018" subfolder
exists, then the function will return "/home/user/projects".
(Suprisingly no existing Qt method for this!)
A pseudo color renderer was getting created in classify() but never deleted.
Spotted by @PeterPetrik
As a bonus switched a for loop from mixed constBegin()/end() usage to range for.
when clicking on ok of an attribute form, tell all embedded widgets (all
widgets actually) that we are going to close the form and it's the last
call to push changes to the edit buffer or they will be lost.
Fix#19137
