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make a beautiful pdf with qt



  • hy tout le monde :)

    I'm trying to make a nice pdf document and I'd like some information and explanations to make a good document.

    in my to do list :
    put a picture - is okay
    center a title - is okay
    grow the writing title - not okay
    soooo ...

    for explain i want this :
    pdf_style.png

    my graphs are qcustomplot

    so if you have any template or advice for beautiful pdf it's super cool :)


  • Lifetime Qt Champion

    Hi,

    What are you using currently to build the document you want to print ?



  • for my test i use qt 5.9.9 and the class are qprinter and qpainter, for basic using is cool but to insert the qtablewidget in the doc is not simple and the graphs are worse.



  • for my graphs it's okay.

    i use this code for convert the graph to picture :

    QCP::ResolutionUnit resolutionUnit = QCP::ruDotsPerCentimeter;
    ui->graph->savePng("test_save_graph.png",1000,500,1.0,-1,96,resolutionUnit);
    
    

    and after i put the image in my pdf easly.

    for the qtablewidget it's still complicated, I still don't have the solution.


  • Lifetime Qt Champion

    @Albator

    Hi
    All widget can be asked to draw them self on device.
    https://doc.qt.io/qt-5/qwidget.html#render

    so you can render both table and graphs this way.



  • so i look an another answers :
    credits @mrjj and @Ni. Sumi

    and i found solution for display my qtablewidget but i don't understand how the layout or size works.
    I display everything I needed, but now I need to understand how everything works to place everything correctly.

    for exemple in this code i have :

    QString nomFichier = QFileDialog::getSaveFileName(0, QString::fromUtf8("Générer PDF"), QCoreApplication::applicationDirPath(), "*.pdf");
    
        if (!nomFichier.isEmpty())
        {
            if (QFileInfo(nomFichier).suffix().isEmpty())
                nomFichier.append(".pdf");
    
            QPrinter printer(QPrinter::HighResolution);
            printer.setOutputFormat(QPrinter::PdfFormat);
            printer.setOutputFileName(nomFichier);
            printer.setOrientation(QPrinter::Portrait);
            printer.setPaperSize(QPrinter::A4);
            printer.setPageSize(QPrinter::A4);
            printer.setPageMargins(15,15,15,15,QPrinter::Millimeter);
    
            qDebug() << "Page px :" << printer.pageRect() << printer.paperRect();
            qDebug() << "Page mm :" << printer.pageRect(QPrinter::Millimeter) << printer.paperRect(QPrinter::Millimeter);
            qreal left, top, right, bottom;
            printer.getPageMargins(&left, &top, &right, &bottom, QPrinter::DevicePixel);
            qDebug() << "Marges px :" << left << top << right << bottom;
            printer.getPageMargins(&left, &top, &right, &bottom, QPrinter::Millimeter);
            qDebug() << "Marges mm :" << left << top << right << bottom;
    
            QPainter painter(&printer);
    
                // Pour écrire du texte
            QFont police("Tekton Pro",30);
                QFontMetrics tailleMotPx = painter.fontMetrics();
                int largeurLabel = tailleMotPx.width("titre");
    
                painter.setPen(Qt::black);
                painter.drawText(printer.width()/2 - largeurLabel/2,50,"titre");
                painter.drawText(0, printer.pageRect().y()*2, QString::fromUtf8("Ligne 1"));
    
                // Une nouvelle page
                printer.newPage();
                const QImage image("C:/Users/portalc/Pictures/Saved Pictures/logo_moni.jpg");
                const QPoint imageCoordinates(15,0);
    
                const QImage image1("C:/Users/portalc/Pictures/Saved Pictures/logo_moni.jpg");
                const QPoint imageCoordinates1(9000,0);
    
    
                painter.drawImage(imageCoordinates, image);
                painter.drawImage(imageCoordinates1, image1);
                //pdfWriter.newPage();
    
                painter.drawText(0, printer.pageRect().y()*3, QString::fromUtf8("Ligne 2"));
    
    
                 QPixmap pix(ui->tab_indic->size());
                 QPainter painter1(&pix);
                 ui->tab_indic->render(&painter);
                 painter.end();
    
    
                 painter1.begin(&printer);
                 double xscale = printer.pageRect().width() / double(pix.width());
                 double yscale = printer.pageRect().height() / double(pix.height());
                 double scale = qMin(xscale, yscale);
                 painter.translate(printer.paperRect().x() + printer.pageRect().width() / 2,
                                   printer.paperRect().y()*4 + printer.pageRect().height() / 2);
                 painter.scale(scale, scale);
                 painter.translate(-ui->tab_indic->width() / 2, -ui->tab_indic->height() / 2);
                 painter.drawPixmap(0, 0, pix);
                 painter.end();
    
                 qDebug() << printer.pageRect().width();
                 qDebug() << printer.pageRect().height();
                 qDebug() << printer.paperRect().x();
                 qDebug() << printer.pageRect().y()*4;
                 qDebug() << yscale << xscale << scale ;
    

    with this code everything overlaps.

    how to play with the parameters to make it right?

    layout_size.png


  • Lifetime Qt Champion

    Well since you have simple requirements, you could also consider building an html document and print that. It could prove simpler to get the way you want it.



  • I'm trying to familiarize myself with this method so for the moment it's not too complex but it could become one.
    but the idea of html is still an interesting option :)


  • Lifetime Qt Champion

    If memory serves well, the "C++ GUI Programming with Qt 4" book has a chapter dedicated to that with examples. Even if it's Qt 4, the concepts still applies here.



  • to take the whole qtablewidget with a lot of rows and columns, just go to the .ui and change the :
    minimum size

    then we use this piece of code to insert the tab in a pdf :

    QPixmap pix(QSize(1800,1000)); //with the new size of minimum size
    QPainter painter(&pix);
    ui->tab_indic->render(&painter);
    painter.end();
    
    QPrinter printer(QPrinter::HighResolution);
    printer.setOrientation(QPrinter::Portrait);
    printer.setOutputFormat(QPrinter::PdfFormat);
    printer.setPaperSize(QPrinter::A4);
    printer.setPageMargins(15,15,15,15,QPrinter::Millimeter);
    printer.setOutputFileName("test.pdf"); // will be in build folder
    
    painter.begin(&printer);
    
    painter.drawText(0,printer.pageRect().y()*1,QString::fromUtf8("Ligne 0"));
    
    painter.save(); // save the parameters of painter for a normal use to write texte
    
    qDebug() <<"before translate"<< printer.pageRect().y()<<printer.pageRect().x()<<printer.pageRect().width()<<printer.pageRect().height()<<ui->tab_indic->size();
    
    double xscale = printer.pageRect().width() / double(pix.width());
    double yscale = printer.pageRect().height() / double(pix.height());
    double scale = qMin(xscale, yscale);
    
    qDebug() <<"scale = "<< scale;
    
    /////////// Translate new parameters to the painter for draw the qtablewidget /////////////////
    
    painter.translate(printer.paperRect().x() + printer.pageRect().width() / 2,printer.paperRect().y() + printer.pageRect().height() / 2);
    
    painter.scale(scale, scale);
    
    painter.translate(-ui->tab_indic->width() / 2, -ui->tab_indic->height() / 2);
    
    painter.drawPixmap(0, 0, pix);
    
    qDebug() <<"post translate"<< printer.pageRect().y()<<printer.pageRect().x()<<printer.pageRect().width()
    <<printer.pageRect().height()<<ui->tab_indic->size()
    <<printer.paperRect().x() + printer.pageRect().width() / 2
    <<printer.paperRect().y() + printer.pageRect().height() / 2;
    
    painter.restore();// restore the parameters save latest
    
    qDebug() <<"post restore"<< printer.pageRect().y()<<printer.pageRect().x()<<printer.pageRect().width()<<printer.pageRect().height()<<ui->tab_indic->size();
    
    QFont police("Tekton Pro",10);
    QFontMetrics tailleMotPx = painter.fontMetrics();
    
    
    painter.setPen(Qt::black);
    
    painter.drawText((printer.paperRect().x())/2,0,"titre");
    
    painter.drawText(0, printer.pageRect().y()*2,QString::fromUtf8("Ligne 1"));
    
    printer.newPage();
    

    I still have some questions to do a mad pdf but for now it's cool.


  • Lifetime Qt Champion

    Hi
    Can i ask what a "mad pdf" is ?



  • it's a good question,@mrjj
    well I'd say it's a mad pdf when it's visually beautiful but not only when I've managed to make a code that automate pdf creation by including all the widgets I need in a fast and ergonomic way without any placement hassle, no problem to cut a table when the table is bigger than the page and it doesn't display on another page etc etc etc
    it's not exactly crazy for programming champions like you jajaja!



  • Dear @Albator

    Please use LimeReport .
    Don't make torture yourselves. :)

    Regards,
    Mucip:)



  • limereport it looks really nice, I didn't know it at all ! then you have to see if it's easy to use.
    For the moment the report I want to create contains only:

    • 1 table
    • 2 graphs
    • a dozen text boxes in qlineEdit or qtextEdit
      it's not a big deal. but the report could be useful one day thanks to me :)

    and I have one more question:
    Can you make line breaks appear in qtextEdit with a basic painter.drawText?


  • Lifetime Qt Champion

    @Albator said in make a beautiful pdf with qt:

    Can you make line breaks appear in qtextEdit with a basic painter.drawText?

    drawText can wordwrap if you use the overload that takes a rect.

    using LimeReport might be a good option as not to hand program all of it.
    Its very powerfull and once you learn it good, you can make almost anything.



  • @mrjj said in make a beautiful pdf with qt:

    Its very powerfull and once you learn it good, you can make almost anything.

    Hi,
    Absolutely true...

    Dive into LimeReport... :)

    Regards,
    Mucip:)



  • @Mucip @mrjj @SGaist
    Okay, you convinced me :) thanks again



  • I've been watching limereport and I'm thinking that at first glance it's not bad because you can find all our widgets directly in the database and all you have to do is drag and drop them to get them in a report.

    But it doesn't do it automatically? we have to place them manually, at first glance anyway.


  • Lifetime Qt Champion

    @Albator
    Well that is very normal with report generators as its very hard to guess
    what to put in the report for the app.
    So often that is the creative process.


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