Am Dienstag, 3. Februar 2015, 10:59:44 schrieb René J.V. Bertin: > I have no experience whatsoever in doing this kind of thing in Qt, but > looking at the 2 images in the OP it strikes me that the image prepared in > the background simply has (been scaled up from) a much lower resolution. No, there's no scaling involved here. The pixmap has the same size as the bounding rectangulare of the graphics item.
> Has it occurred to you that the speed gain you're seeing might be related > to doing the expensive operation (drawing a vast number of dots, circles > and line segments with AA) at a much lower resolution? It's really related to the loop over many points with all the painting inside. -- Alexander _______________________________________________ Interest mailing list [email protected] http://lists.qt-project.org/mailman/listinfo/interest
