QPainter::drawText doesn't work

[ivanicy]

Hello!

I am trying to write a pdf file with QPainter. I have a problem because the drawText function doesn't work. I use drawText and drawImage and the second one works correctly. This is my function code:

void report_tab::on_pdfButton_clicked()
{
    QIcon icon(":/MainIcons/Resources/pdf_pressed_2.png");
    icon.addPixmap(QPixmap(":/MainIcons/Resources/pdf_pressed_2.png"));
    ui->pdfButton->setIcon(icon);

    printer.setPageSize(QPrinter::A4);
    printer.setOrientation(QPrinter::Portrait);
    printer.setOutputFormat(QPrinter::PdfFormat);

    QString fileName = QFileDialog::getSaveFileName(this, "Save pdf...", QCoreApplication::applicationDirPath(), "PDF (*.pdf)" );
    if (!fileName.isNull())
    {
        printer.setOutputFileName(fileName);
        QImage imagen = imageShot.toImage();
        QImage graph = profileShot.toImage();
        QImage table = tableShot.toImage();
        QImage fileInf = fileInfo.toImage();
        QImage generalDat = genData.toImage();

        //imagen = imagen.scaled(imagen.width() - 300, imagen.height() - 100);
        QPainter painter(&printer);
        QRect rect = painter.viewport();
        rect.setSize(QSize(imagen.width(), imagen.height()));
        QSize size = imagen.size();
        size.scale(rect.size(), Qt::KeepAspectRatio);
        double xscale = printer.pageRect().width() / double(imagen.width()*1.19);
        double yscale = printer.pageRect().height() / double(imagen.height());

        double scale = qMin(xscale, yscale);
        painter.scale(scale, scale);
        painter.translate(140, 220);

        QFont font("Courier New");
        font.setStretch(QFont::ExtraExpanded);
        painter.setFont(font);
        QTextOption options;
        options.setWrapMode(QTextOption::WordWrap);

        painter.setPen(Qt::SolidLine);
        painter.drawText(0, 0, ui->projectLabel->text());
        painter.drawImage(0, ui->projectLabel->height() + 30, imagen);
        painter.drawImage(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30, fileInf);
        painter.drawImage(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + fileInf.rect().height() + 30, generalDat);
        painter.drawImage(imagen.rect().width() - graph.rect().width(), ui->projectLabel->height() + 30 + imagen.rect().height() + 30, graph);
        painter.drawImage(imagen.rect().width() - table.rect().width(), ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + graph.rect().height() + 30, table);
        painter.drawText(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + graph.rect().height() + 30 + table.rect().height() + 30, ui->projectLabel->text());
        painter.drawText(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + graph.rect().height() + 30 + table.rect().height() + 30 + ui->projectLabel->height() + 30, ui->codeLabel->text());
        painter.drawText(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + graph.rect().height() + 30 +
                         table.rect().height() + 30 + ui->projectLabel->height() + 30 + ui->codeLabel->height() + 30, ui->dateEdit->text());
        painter.drawText(QRectF(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + graph.rect().height() + 30 + table.rect().height() + 30 + ui->projectLabel->height() + 30 + ui->codeLabel->height() + 30 + ui->dateEdit->height() + 30, imagen.width(), 300), ui->descriptionLabel->toPlainText(), options);

        painter.end();

        QIcon icon(":/MainIcons/Resources/pdf.png");
        icon.addPixmap(QPixmap(":/MainIcons/Resources/pdf.png"));
        ui->pdfButton->setIcon(icon);
        pdfButtonClicked = false;
        QMessageBox::information(NULL, "Export PDF", "PDF created.", QMessageBox::Ok);
    } else {
        QIcon icon(":/MainIcons/Resources/pdf.png");
        icon.addPixmap(QPixmap(":/MainIcons/Resources/pdf.png"));
        ui->pdfButton->setIcon(icon);
        pdfButtonClicked = false;
    }

}

How can I fix this problem? Thank you very much!

[m.sue]

Hi @ivanicy

What is it that does not work? No text at all, wrong position, wrong font, wrong whatever?

I have no problem with PDF text output. Well I do not use these options, though:

font.setStretch(QFont::ExtraExpanded);
options.setWrapMode(QTextOption::WordWrap);

-Michael.

[ivanicy]

@m.sue The text doesn't appear in the pdf. These options only format the text. I tried commenting these lines without changes.

[raven-worx]

@ivanicy said in QPainter::drawText doesn't work:
instead of

painter.setPen(Qt::SolidLine);

try

peinter.setPen( QPen(Qt::black,1) );

At a short glance this might be the problem, not necessarily though.

[m.sue]

Hi @ivanicy

I use Tahoma font, I explicitly set a pen with color via QBrush. I do not explicitly call painter.end(). I do not use QRect textDraw, just positional text draw with QPoint. Nothing special, as it seems.

Which OS, which Qt version anyway?

-Michael.

[ivanicy]

@raven-worx This give me the same result. No text

[ivanicy]

I use the drawText function in a QPrintPreviewDialog and the text appears correctly. I don't know why when I want to write a pdf, the text doesn't appear. Here is my QPrintPreviewDialog code:

void report_tab::print(QPrinter *p) {
    QImage imagen = imageShot.toImage();
    QImage graph = profileShot.toImage();
    QImage table = tableShot.toImage();
    QImage fileInf = fileInfo.toImage();
    QImage generalDat = genData.toImage();

    //imagen = imagen.scaled(imagen.width() - 200, imagen.height() - 100);
    QPainter painter(p);
    QRect rect = painter.viewport();
    rect.setSize(QSize(imagen.width(), imagen.height()));
    QSize size = imagen.size();
    size.scale(rect.size(), Qt::KeepAspectRatio);
    double xscale = printer.pageRect().width() / double(imagen.width()*1.19);
    double yscale = printer.pageRect().height() / double(imagen.height());

    double scale = qMin(xscale, yscale);
    painter.scale(scale, scale);
    painter.translate(160, 220);

    QFont font("Courier New");
    font.setStretch(QFont::ExtraExpanded);
    painter.setFont(font);
    QTextOption options;
    options.setWrapMode(QTextOption::WordWrap);

    painter.drawText(0, 0, ui->projectLabel->text());
    painter.drawImage(0, ui->projectLabel->height() + 30, imagen);
    painter.drawImage(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30, fileInf);
    painter.drawImage(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + fileInf.rect().height() + 30, generalDat);
    painter.drawImage(imagen.rect().width() - graph.rect().width(), ui->projectLabel->height() + 30 + imagen.rect().height() + 30, graph);
    painter.drawImage(imagen.rect().width() - table.rect().width(), ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + graph.rect().height() + 30, table);
    painter.drawText(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + graph.rect().height() + 30 + table.rect().height() + 30, ui->projectLabel->text());
    painter.drawText(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + graph.rect().height() + 30 + table.rect().height() + 30 + ui->projectLabel->height() + 30, ui->codeLabel->text());
    painter.drawText(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + graph.rect().height() + 30 +
                     table.rect().height() + 30 + ui->projectLabel->height() + 30 + ui->codeLabel->height() + 30, ui->dateEdit->text());
    painter.drawText(QRectF(0, ui->projectLabel->height() + 30 + imagen.rect().height() + 30 + graph.rect().height() + 30 + table.rect().height() + 30 + ui->projectLabel->height() + 30 + ui->codeLabel->height() + 30 + ui->dateEdit->height() + 30, imagen.width(), 300), ui->descriptionLabel->toPlainText(), options);

}

Thank you