QPixmap xAxis Rotation

Question

I want to rotate a pixmap from its xAxis, but it just rotates from top left corner.(I want it to be rotated from the center) here is my code:

QTransform *X = new QTransform();
X->translate(pixmap().size().width() / 2, pixmap().size().height() / 2);
X->rotate(rtn, Qt::XAxis); //rtn is an angle
setTransform(*X);

It seems that the translate method does not change the origin point to the center of my pixmap. Now I want some help to solve this problem.

score 0 · Accepted Answer · answered Jul 19 '15 at 14:20

ok, the problem was that I didn't translate back my transformation after rotate method, this is the appropriate rotation from center on xAxis:

setTransform(QTransform().translate(pixmap().size().width() / 2, pixmap().size().height() / 2).rotate(rtn, Qt::XAxis).translate(-pixmap().size().width() / 2, -pixmap().size().height() / 2));

QPixmap xAxis Rotation

1 Answers1