Qt Widget for cropping images.
Use ImageCropper - it's easy. First you need to create instance and configure it:
// Create instance
imageCropper = new ImageCropper(this);
// If you need to fix proportions of cropping rect
// ... set proportions if needed
imageCropper->setProportion(QSize(4,3));
// ... and fix it
imageCropper->setProportionFixed(true);
// Set image for cropping
imageCropper->setImage(QPixmap(":/img.jpg"));
// Set background color under cropped image pane
imageCropper->setBackgroundColor(Qt::lightGray);
// Set border color of cropping rect helper
imageCropper->setCroppingRectBorderColor(Qt::magenta);And when you need crop image, just do it:
QPixmap croppedImage = imageCropper->cropImage();Qt 4.6 and greater, or Qt 5.1 and greater