qt rotate qimage

To rotate a QImage using the Qt framework in C++, you can follow these steps:

1. Create a QImage object and load an image into it using the appropriate constructor or the load() function.

2. Create a QTransform object to represent the transformation you want to apply to the image.

3. Use the QTransform::rotate() function to specify the angle of rotation in degrees. This function returns a new QTransform object representing the rotated transformation.

4. Use the QImage::transformed() function to apply the rotation transformation to the image. Pass the rotated QTransform object as the argument to this function. This function returns a new QImage object with the applied transformation.

5. Optionally, you can save the rotated image to a file using the QImage::save() function.

Here is an example code snippet that demonstrates the rotation of a QImage object using Qt in C++:

#include <QImage>
#include <QTransform>

int main()
{
    QImage image;
    image.load("path_to_image.jpg");

    QTransform transform;
    transform.rotate(90);

    QImage rotatedImage = image.transformed(transform);

    rotatedImage.save("path_to_rotated_image.jpg");

    return 0;
}

Note: Make sure to replace "path_to_image.jpg" and "path_to_rotated_image.jpg" with the actual paths to your image files.

I hope this explanation helps you understand how to rotate a QImage using Qt in C++. Let me know if you have any further questions.