13 Commits

Author	SHA1	Message	Date
Matthias Kuhn	28a21209b9	[sipify] seealso	2017-04-30 16:52:05 +02:00
Denis Rouzaud	c1832854a2	sipify batch ... * QgsDial * QgsDialog * QgsDockWidget * QgsEncodingFileDialog * QgsErrorDialog	2017-04-25 13:46:56 +02:00
Denis Rouzaud	1bfa539df1	[sipify] remove extra blank line	2017-04-24 07:39:30 +02:00
Denis Rouzaud	8f2a5c7c00	sipify all	2017-04-20 14:21:36 +02:00
Nyall Dawson	bfd37e1122	[sipify] Add return types for functions in docstrings ... and change \return -> :return: in docystrings	2017-04-08 09:48:48 +10:00
Matthias Kuhn	58d2d6d7f9	sipify_all	2017-04-07 12:26:30 +02:00
Matthias Kuhn	cd3528a109	Sipification	2017-04-07 12:26:30 +02:00
nirvn	2a326ef8ad	[FEATURE] support aggregation of geometry ... This feature adds a 'collect' aggregation method resulting in a single multipart geometry from a list of geometries. This is exposed in the expression engine via the existing aggregate() function, as well as a new collect() function.	2016-08-24 08:39:05 +07:00
Nyall Dawson	2d50895d04	Const correctness for QgsVectorLayer methods	2016-07-15 06:07:52 +10:00
Nyall Dawson	307aabd66a	[FEATURE] Aggregates for expressions ... This commit adds a number of different forms of aggregates to the expression engine. 1. Aggregates within the current layer, eg sum("passengers") Supports sub expressions (ie sum("passengers"/2) ), group by ( sum("passengers", group_by:="line_segment") ), and optional filters ( sum("passengers", filter:= "station_class" > 3 ) ) 2. Relational aggregates, which calculate an aggregate over all matching child features from a relation, eg relation_aggregate( 'my_relation', 'mean', "some_child_field" ) 3. A summary aggregate function, for calculating aggregates on other layers. Eg aggregate('rail_station_layer','sum',"passengers") The summary aggregate function supports an optional filter, making it possible to calculate things like: aggregate('rail_stations','sum',"passengers", intersects(@atlas_geometry, $geometry ) ) for calculating the total number of passengers for the stations inside the current atlas feature In all cases the calculations are cached inside the expression context, so they only need to be calculated once for each set of expression evaluations. Sponsored by Kanton of Zug, Switzerland	2016-05-17 10:53:25 +10:00
Nyall Dawson	821134ca91	Add method to convert string to aggregate type	2016-05-17 10:53:24 +10:00
Nyall Dawson	dcc047af49	Add possibility to handle aggregate calculation at data provider ... (not implemented for any providers yet)	2016-05-17 10:53:24 +10:00
Nyall Dawson	50e41c8133	New utility class QgsAggregateCalculator, simplifies calculating ... aggregates from vector layer fields and expressions	2016-05-17 10:53:24 +10:00