Help with a visual effect

[SkripT]

In honor of jacek, look what I have achieved using his code I've noticed some strange issues:
1) In my computer it goes very slow. I think that's some issue with QPainter....
2) The movement in the right side is not simetric with the left side . The matrix should work "equally" with both sides, isn't it?


PD: copy the images where the exe file is
PD2: tune the speed with the value passed to QTimer::start