CODEWITHSUNDEEP
qtuser-interface
Piyush
Piyush

Reputation: 2609

Rotate Image in Qt

In my application I want to rotate image (I have set image on QLabel). I have set one QPushButton, on click that button I want to rotate my image in Four directions (Right->Bottom->Left->Top)

Any help?

Upvotes: 9

Views: 26333

Answers (2)

Molham
Molham

Reputation: 175

QMatrix is deprecated so you can use QTransform instead

void MyWidget::rotateLabel()
{
    QPixmap pixmap(*my_label->pixmap());
    QTransform tr;
    tr.rotate(90);
    pixmap = pixmap.transformed(tr);
    my_label->setPixmap(pixmap);
}

Upvotes: 6

dabhaid
dabhaid

Reputation: 3879

Assuming you have a pointer to your QLabel you could do something like

void MyWidget::rotateLabel()
{
    QPixmap pixmap(*my_label->pixmap());
    QMatrix rm;
    rm.rotate(90);
    pixmap = pixmap.transformed(rm);
    my_label->setPixmap(pixmap);
}

This will take you through Right, Bottom, Left, Top in four applications.

Upvotes: 21

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