On 6 March 2017 at 23:45, Mark Johnson <mj10...@googlemail.com> wrote: > The spatialite function 'ST_Project' is based on the librttopo functionality > (formally LWGEOM) > - and is only available when compiled with '--enable-rttopo' > > https://git.osgeo.org/gogs/rttopo/librttopo > > So if a support for 'Meters as Map units' was desired, in the case of > degrees > - the use the librttopo functionality as a part of the 'QgsGeos' would be > the most effective way to deal with this > > This would be a new dependency, but would also offer many other > functionalities (such as Topology).
Hi Mark, This shouldn't be implemented using an external dependency -- instead you'll need to use the existing QGIS classes like QgsCoordinateTransform. You'd just need to modify: QgsRenderContext::convertToPainterUnits QgsRenderContext::convertToMapUnits QgsRenderContext::convertFromMapUnits Everything you need should already be encapsulated in QgsRenderContext (and the QgsMapToPixel member). Nyall _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
