implicitly shared copy of an internal cache instead of recreating the
coordinate sequence again and again.
Improves performance of the nodetool on large features a lot (refs #13963)
Also introduce Qgs(Coordinate|Ring|Point)SequenceV2 typedefs.
- removes storage of bounding box from QgsPointV2 (gives significant
decrease in size of object)
- more efficient calculation of bounding box for linestrings
Additionally, this commit moves the bounding box invalidation to a
virtual QgsAbstractGeometryV2::clearCache() method, so that other
non-bounding box caches can also be cleared when the geometry
is modified.
ton of available area units (eg m2, km2, mi2, ft2, yd2, ha, ac,
etc)
Adds a new option in both the QGIS setting and project properties to
set the units used for area measurements. Just like the distance
setting, this defaults to the units set in QGIS options, but can
then be overridden for specific projects.
The setting is respected for area calculations in:
- Attribute table field update bar
- Field calculator calculations
- Identify tool derived length and perimeter values
Also adds unit tests to ensure that area calculated by attribute table
update bar, field calculator and identify tool are consistent wrt
ellipsoidal calculations and area units.
TODO: make measure tool respect area setting
(refs #13209, #4252 and fixes#12939, #2402, #4857)
Adds a new option in project properties to set the units used for
distance measurements. This setting defaults to the units set in
QGIS options, but can then be overridden for specific projects.
The setting is respected for length and perimeter calculations in:
- Attribute table field update bar
- Field calculator calculations
- Identify tool derived length and perimeter values
- Default unit shown in measure dialog
Also adds unit tests to ensure that length and perimeter calculated
by attribute table update bar, field calculator and identify tool
are consistent wrt ellipsoidal calculations and distance units.
(refs #13209, #12939, #2402, #4857, #4252)
calculations for $length, $area, $perimeter (refs #13209)
ie, the default is now to use planimeteric calculations unless
a geomCalculator has been explicitly set
Implemented a simple heuristic that should keep the number of cached
features per layer reasonable - and thus lower the amount of consumed
memory and CPU for big layers.
