[QGIS-Developer] QgsMapCanvas refresh for geometries only possible?
mj10777 at googlemail.com
Wed May 30 03:57:33 PDT 2018
I have the impression that when in the main QGis Canvas only a geometry
(with QgsMapTool / QgsVectorLayer) is being changed, only the geometry is
being refreshed and not the underlining Rasters (which have not changed).
I would like to know how this is done since I am working with an adapted
Georeferencer with QgsMapTool / QgsVectorLayer for the points, where when
the Pixel-Point is moved in the Georeferencer-MapCanvas both the geometry
and the Raster are being refreshed, which when multiple points need to be
moved is quite time consuming.
I have looked through the QgisApp, QgsMapTool, QgsMapLayer/QgsVectorLayer
classes but I fail to see what is being done differently.
If an hint could be given where this done, I would be grateful.
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