[Solved]QPixmap being clipped after rotation

[stereomatching]

@

QImage img("lena.jpg");

rotate_image_implace(img, angle); //rotate the img with angle degrees
graph_pixmap_->setPixmap(QPixmap::fromImage(img));
graph_scene_->setSceneRect(img.rect());

@

type of graph_pixmap_ is QGraphicsPixmapItem
type of graph_scene_ is QGraphicsScene

This may clip the image if their height and width are different, how could
I rotate the image without clipping it?

Because the program need to save the image after rotating and mirror(vertical and horizontal),
rotation of QGraphicsPixmapItem is not adopted.

[stereomatching]

After struggling of several hours, I find out that my scaling methods has some bugs, sorry to
bother you all.