Russian Qt Forum

QPixmap canvas(width(), height());
QPainter p;
p.begin(&canvas);
p.setPen(Qt::blue);
p.drawText(0, 0, QString(text));
p.end();
imageLabel->setPixmap(canvas);

void ImageViewer::open()
{
    QString fileName = QFileDialog::getOpenFileName(this,
                       tr("Open File"), QDir::currentPath());

    QFile file(fileName);
   if (!file.open( QFile::ReadOnly | QFile::Text))
    {
        QMessageBox::information(this, tr("HTTP"),
                                 tr("Unable to open the file %1: %2.")
                                 .arg(fileName).arg(file.errorString()));

    }

    QByteArray data = file.readAll();
    QTextCodec *codec = QTextCodec::codecForName("Windows-1251");
    QString str = codec->toUnicode(data);
    file.close();
    QString text = str;
    QPixmap canvas(800, 600);
    QPainter p(&canvas);
    QColor color(0xff, 0xff, 0xff);
    QFont serifFont("MS Shell Dlg", 10);
    p.begin(&canvas);
    p.setPen(color);
    p.fillRect(0, 0, 800, 600, color);
    p.setFont(serifFont);
    for (int i = 0; i < text.size(); ++i)
    {
        //color.setHsv(255, 255, 255);
        QColor color(0, 0, 0);
        p.setPen(color);
        p.drawText(10, 20, QString(text));
    }
    p.end();

    imageLabel->setPixmap(canvas);

p.drawText( x, y, text );

p.drawText( 0, QFontMetrics( p.font() ).ascent(), text );

void ImageViewer::open()
{
    QString fileName = QFileDialog::getOpenFileName(this,
                       tr("Open File"), QDir::currentPath());

    QFile file(fileName);
    QString text;
    QTextStream stream(&file);


    QPixmap canvas(width(), height());
    QPainter p(&canvas);
    QColor color(0xff, 0xff, 0xff);
    QFont serifFont("MS Shell Dlg", 8);
    p.begin(&canvas);
    p.setPen(color);
    p.fillRect(0, 0, width(), height(), color);
    p.setFont(serifFont);
    if (file.open( QFile::ReadOnly | QFile::Text))
    {
     QString line;
        int k = 1;
        while ( !stream.atEnd() ) {
            line = stream.readLine(); // line of text excluding '\n'
            qDebug() << k++ << line;
            //text += line;
            for (int i = 0; i < line.size(); ++i)
    {
        //color.setHsv(255, 255, 255);
        QColor color(0, 0, 0);
        p.setPen(color);
        p.drawText(10, (k-1)*20, QString(line));
    }
        }
    }
     else
    {
    	QMessageBox::information(this, tr("HTTP"),
                                 tr("Unable to open the file %1: %2.")
                                 .arg(fileName).arg(file.errorString()));
    }
    QTextCodec *codec = QTextCodec::codecForName("Windows-1251");
    file.close();

    p.end();

    imageLabel->setPixmap(canvas);

Q_D(QTextDocument) --> QTextDocumentPrivate* const d = d_func();

QPrinter printer(QPrinter::HighResolution);
    printer.setOrientation(QPrinter::Landscape);
    printer.setOutputFormat(QPrinter::PdfFormat);
    printer.setOutputFileName(fileName);
    QPainter painter(&printer);
        QRect rect = painter.viewport();
        QSize size = imageLabel->pixmap()->size();
        size.scale(rect.size(), Qt::KeepAspectRatio);
        painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
        painter.setWindow(imageLabel->pixmap()->rect());
        painter.drawPixmap(0, 0, *imageLabel->pixmap());

printer.setOrientation(QPrinter::Landscape);

void ImageViewer::preview()
{

    QString fileName = QFileDialog::getOpenFileName(this,
                       tr("Open File"), QDir::currentPath());
    QFile file(fileName);
    QString str;
    if (file.open(QFile::ReadOnly))
    {
        QByteArray data = file.readAll();
        QTextCodec *codec = Qt::codecForHtml(data);
        str = codec->toUnicode(data);
        if (Qt::mightBeRichText(str))
        {
            doc->setHtml(str);
        }
        else
        {
            str = QString::fromLocal8Bit(data);
            doc->setHtml(str);
        }
    }
    file.close();
    QColor color(0xff, 0xff, 0xff);
    QPixmap preview(width(), height());
    QPainter p(&preview);
    p.setPen(color);
    p.fillRect(0, 0, width(), height(), color);
    (void)doc->documentLayout(); // make sure that there is a layout
    // QRectF body = QRectF(QPointF(0, 0), size);
    QPointF pageNumberPos;
    extern int qt_defaultDpi();
    qreal sourceDpiX = qt_defaultDpi();
    qreal sourceDpiY = sourceDpiX;
    QPaintDevice *dev = doc->documentLayout()->paintDevice();
    if (dev)
    {
        sourceDpiX = dev->logicalDpiX();
        sourceDpiY = dev->logicalDpiY();
    }
    // scale to dpi
    // QSizeF scaledPageSize = doc->pageSize;
    //const QSizeF printerPageSize(preview.width(), preview.height());
    QAbstractTextDocumentLayout *layout = doc->documentLayout();
    layout->setPaintDevice(p.device());
    const int dpiy = p.device()->logicalDpiY();
    //const int margin = (int) ((2/2.54)*dpiy); // 2 cm margins
    const int margin = 0;
    QTextFrameFormat fmt = doc->rootFrame()->frameFormat();
    fmt.setMargin(margin);
    doc->rootFrame()->setFrameFormat(fmt);

    QRectF body = QRectF(0, 0, p.device()->width(), p.device()->height());
    pageNumberPos = QPointF(body.width() - margin,
                            body.height() - margin
                            + QFontMetrics(doc->defaultFont(), p.device()).ascent()
                            + 5 * p.device()->logicalDpiY() / 72);

    QFont font(doc->defaultFont());
    font.setPointSize(8); // we define 10pt to be a nice base size for printing
    doc->setDefaultFont(font);
    doc->setPageSize(body.size());
    QRectF view(0, 0, body.width(), body.height());
    QAbstractTextDocumentLayout::PaintContext ctx;
    p.setClipRect(view);
    ctx.clip = view;
    layout->draw(&p,ctx);
    imageLabel->setPixmap(preview);
    scaleFactor = 1.0;
    printAct->setEnabled(true);
    fitToWindowAct->setEnabled(true);
    updateActions();

    if (!fitToWindowAct->isChecked())
        imageLabel->adjustSize();
    delete doc;

frame ->resize(width() * 3, height() * 2);

{
		m_printer->setFullPage(true);
		QPrintDialog dlg(m_printer, this);
		if (dlg.exec() != QDialog::Accepted)
			return;
	}
	m_printer->setFromTo(1, 1);

	m_preview->setDocument(ui.textEdit->document());
	m_preview->updatePreview();
	updateScaleEdit(); 

m_preview->paintTo(m_printer);