On Donnerstag, 21. April 2022 16:09:37 CEST Thiago Macieira wrote: > On Thursday, 21 April 2022 06:22:57 PDT Tomi Pannila wrote: > > Is there a possibility to add a picture to Qt documentation where you > > have a rectangle grid and shade the > > edge cells with some color to identify them as edges? If I'm the only > > one confused of the term edge, not edge cell, in integer > > rectangle, then this is not needed. > > You're not. The problem is that, as Aavit described, the class was designed > as an intuitive chess board or pixel board, not as a mathematical > construct. > > A QRect of (0,0) to (1,1) is a 2x2 square. So a square of a single pixel is > (0,0) to (0,0). But then how do you make an empty QRect, that is, a (0,0) > +0+0? > (0,0) to (-1,-1)
When the "bottom-right" corner is above and to the left of the "top-left" corner, the borders excluded instead of included. Weird but it works, and I made it consistent in Qt6 (I believe it was 6.0, could have been before). So (1,1)->(2,2) is the same as (3,3)->(0,0) But yes. It is weird and ugly logic, to keep this old nonsense going. 'Allan _______________________________________________ Development mailing list Development@qt-project.org https://lists.qt-project.org/listinfo/development
