QLabel图像在另一个图像上旋转

Question

I try to make clock on QLabel and control needle rotate

And I put needle.png on clock.png.

I want to control angle let QLabel work like needle rotate on clock.

I don't know how to rotate needle.png.

How to achieve this rotate needle.png on clock.png.

Answer 1

use a transformation

QPixmap orig (":/n/apple-touch-icon.png");
QTransform t;
t.rotate(45+i);
ui->label->setPixmap(orig.transformed(t).scaledToWidth(32));
i+=10;