void MainWindow::mousePressEvent(QMouseEvent *e)
{
    if (e->button()==Qt::LeftButton)

    {
        selectionStarted=true;
        selectionRect.setTopLeft(e->pos());
        selectionRect.setBottomRight(e->pos());
        rb->setGeometry(selectionRect);
        rb->show();
    }
}
void MainWindow::mouseMoveEvent(QMouseEvent *e)
{

    if (selectionStarted)
    {
        selectionRect.setBottomRight(e->pos());
        rb->setGeometry(selectionRect);
        rb->show();
        repaint();
    }
}
void MainWindow::mouseReleaseEvent(QMouseEvent *e)
{
    selectionStarted=false;
}





void MainWindow::on_pushButton_8_clicked()
{
    if(selectionRect.width() > 5 && selectionRect.height() > 5 && !rb->isHidden()){
        QPoint start = ui->edit_label->mapFromGlobal(selectionRect.topLeft());
        int h = (ui->edit_label->rect().height() - ui->edit_label->pixmap()->rect().height())/2 - 23, w = (ui->edit_label->rect().width() - ui->edit_label->pixmap()->rect().width())/2;
        ui->edit_label->setPixmap(ui->edit_label->pixmap()->copy(start.x() - w, start.y() - h, selectionRect.width(),selectionRect.height()));
        ui->edit_label->show();
        fileName = "C:/Users/Youssef Yossry/Desktop/3rd Year-First Term/HCI/PRO/workspace/current";
        angle=0;
        QFile file(fileName);
        file.open(QIODevice::WriteOnly);
        ui->edit_label->pixmap()->save(&file, "PNG");
        add_to_undo(*ui->edit_label->pixmap(), angle);
        redo.clear();
        redoAngle.clear();
        rb->hide();
    }
}