c++ - how to save an edited image from qgraphicsview in QT -


i writing codes load in image file , did edits on image(change pixels' value), zoomed in or zoomed out , save image. tried use qgraphicview , qgraphicsscene save image. however, when tried save image, save visible region of scene. purpose save edited image in original resolution. below codes. loading part:

void imageviewer::loadfile(const qstring &filename) {     if (!filename.isempty()) {         image = new qimage(filename);         if (image->isnull()) {             qmessagebox::information(this, tr("image viewer"),                 tr("cannot load %1.").arg(filename));             return;         }         qgraphicsscene = myqgraphicsview->getscene();         qgraphicsscene->setscenerect(image->rect());         myqgraphicsview->setscene(qgraphicsscene);         qgraphicsscene->addpixmap(qpixmap::fromimage(*image));         currentname = filename;     } }

saving part:

qpixmap pixmap = qpixmap::grabwidget(myqgraphicsview);     pixmap.save(filename);

i think problem may in saving part. tried find method in qgraphicsscene can extract image it, failed. can that? thank much!!!

the addpixmap method returns qgraphicspixmapitem*. need remember it, , use save pixmap. example:

class imageviewer {   qgraphicsview * m_view;   qstring m_currentname;   qgraphicspixmapitem * m_item;   ... };  imageviewer::imageviewer() : m_item(nullptr) { ... }  void imageviewer::loadfile(const qstring &filename) {   if (filename.isempty()) return;   qimage image(filename);   if (image.isnull()) {     qmessagebox::information(this, tr("image viewer"),       tr("cannot load %1.").arg(filename));     return;   }   qgraphicsscene * scene = m_view->scene();   scene->setscenerect(image->rect());   m_item = scene->addpixmap(qpixmap::fromimage(image));   m_currentname = filename; }  void imageviewer::save() {   if (!m_item) return;   qsavefile file(m_currentname);   if (! file.open(qiodevice::writeonly | qiodevice::unbuffered)) {     qmessagebox::information(this, tr("image viewer"),       tr("cannot save %1.").arg(m_currentname));     return;   }   qimage const image = m_item->pixmap().toimage();   image.save(&file);   file.commit(); }

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