how to scale according to the used resolution

[rmagro]

Hi guys,

I was trying to to produce a printed copy of a QTableWidget.

Thanks to JPN I get closer to the goal but I am still experiencing
some problems..

Here is the code as it is so far:

QPrinter printer(QPrinter::ScreenResolution);
 
	QPrintDialog dlg(&printer, this);
 
    if (dlg.exec() == QDialog::Accepted) 
    {
        // calculate the total width/height table would need without scaling  
        const int rows = tableWidget->model()->rowCount(); 
        const int cols = tableWidget->model()->columnCount();  
        double totalWidth = 0.0;
 
        for (int c = 0; c < cols; ++c)  
        {  
            totalWidth += tableWidget->columnWidth(c); 
        }
 
        double totalHeight = 0.0;
 
        for (int r = 0; r < rows; ++r) 
        { 
            totalHeight += tableWidget->rowHeight(r);
        }
 
        // redirect table's painting on a pixmap 
        QPixmap pixmap(totalWidth, totalHeight);
		QPainter::setRedirected(tableWidget->viewport(), &pixmap);
        QPaintEvent event(QRect(0, 0, totalWidth, totalHeight));
        QApplication::sendEvent(tableWidget->viewport(), &event);
        QPainter::restoreRedirected(tableWidget->viewport());
 
        // print scaled pixmap 
        QPainter painter(&printer);		
        //painter.drawPixmap(printer.pageRect(), pixmap, pixmap.rect());
	painter.drawPixmap(printer.pageRect().topLeft(), pixmap, pixmap.rect()); 
    }

QPrinter printer(QPrinter::ScreenResolution);

	QPrintDialog dlg(&printer, this);

    if (dlg.exec() == QDialog::Accepted) 
    {
        // calculate the total width/height table would need without scaling  
        const int rows = tableWidget->model()->rowCount(); 
        const int cols = tableWidget->model()->columnCount();  
        double totalWidth = 0.0;

        for (int c = 0; c < cols; ++c)  
        {  
            totalWidth += tableWidget->columnWidth(c); 
        }

        double totalHeight = 0.0;

        for (int r = 0; r < rows; ++r) 
        { 
            totalHeight += tableWidget->rowHeight(r);
        }

        // redirect table's painting on a pixmap 
        QPixmap pixmap(totalWidth, totalHeight);
		QPainter::setRedirected(tableWidget->viewport(), &pixmap);
        QPaintEvent event(QRect(0, 0, totalWidth, totalHeight));
        QApplication::sendEvent(tableWidget->viewport(), &event);
        QPainter::restoreRedirected(tableWidget->viewport());

        // print scaled pixmap 
        QPainter painter(&printer);		
        //painter.drawPixmap(printer.pageRect(), pixmap, pixmap.rect());
	painter.drawPixmap(printer.pageRect().topLeft(), pixmap, pixmap.rect()); 
    }

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The problem is that I can't get the entire table fitting in the page.

What I am doing wrong?

Thank you for your attention,

Any even partial reply is much appreciated
Roby

[wysota]

I suggest you use the window-viewport transformation of the painter. This way you'll be using logical coordinates of the pixmap but they'll be scaled to device coordinates of the printer.