On 01.10.2015 11:47, Sandro Santilli wrote:
I've found that qgis is now dependent on the C++ GEOS API,
due to the new src/core/geosextra.
It seems to me that the "geosextra" code in its current incarnation
only exposes a function to basically round coordinates to a precision
grid, but in no way changes the precision of operations performed by
further GEOS functions on the resulting geometries.
This is discussed in detail in https://trac.osgeo.org/geos/ticket/713
So my question is: if grid-snapping is enough for QGIS use, is adding
a new dependency on GEOS really needed, or isn't there other internal
code for doing coordinates editing work (would seem easy with Qt
standard library?).
As resulted from the discussion in the geos ticket: the goal is having
the operations run in reduced precision, not just merely snap to grid.
The discussion revealed however that snap to grid is basically what ends
up being done with the current implementation, due to a
mis-understanding of mine of the geos internals. As suggested in the
geos ticket, I'd like to fix this to work as initially intended, and
keep geosextra in QGIS until a new release of GEOS comes out which
implements needed changes in the C-API.
As I've been asked to help with getting the code in place for what
I've understood are good new functionalities I'm here to better
understsand the issue, why the new code is needed and how to best have
it available, considering also that latest GEOS release was published
on August 15, 2015.
See also https://github.com/qgis/qgis/pull/2302
--strk;
_______________________________________________
Qgis-developer mailing list
Qgis-developer@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/qgis-developer
