Hi,

I want to print something. That's not a big problem: I create a QPrinter and a QPainter to paint on the QPrinter. I can draw an image and some text. I also want to draw some lines. In the preview window (QPrintPreviewDialog), everything looks fine. But, when I print to PDF with an external PDF-Printer or to a real printer, the lines lose their color and appear in black. The Textcolor remains at it should be...

Qt Code: 
  1. void MyClass::Print(bool preview)
  2.   {
  3.     QPrinter *printer = new QPrinter(QPrinter::HighResolution;
  4.     printer->setPageMargins(20,20,20,20,QPrinter::DevicePixel);
  5.     printer->setColorMode(QPrinter::Color);
  6.     printer->setPageSize(QPrinter::A4);
  7.     printer->setPrintRange(QPrinter::AllPages); 
  8.  
  9.     if(preview)
  10.       {
  11.         QPrintPreviewDialog ppd(printer);
  12.         connect(&ppd, SIGNAL(paintRequested(QPrinter*)), this, SLOT(Print(QPrinter*)));
  13.         ppd.exec();
  14.       }
  15.     else
  16.       {
  17.         QPrintDialog *printDialog = new QPrintDialog(printer, CMainFrame::GetMainFrame().GetMainWin());
  18.         if (printDialog->exec()) 
  19.           Print(printer);    
  20.       } 
  21.     delete printer;
  22.   }
To copy to clipboard, switch view to plain text mode 

Qt Code: 
  1. void MyClass::Print(QPrinter* printer)
  2.   {
  3. //this is just a demonstration. My "real" code makes more sense ;)
  4.  
  5.     QPainter p(printer);
  6.     QRectF border(QPoint(0,0), printer->pageRect().size() - QSize(1,1));
  7.  
  8.     p.setPen(Qt::red);
  9.     p.drawRect(border);
  10.  
  11.     QDateTime time = QDateTime::currentDateTime();
  12.     QString timestr = time.toString("dddd, MMMM d, yyyy hh:mm:ss");
  13.     p.drawText(400, 400, timestr);
  14.  
  15.     p.drawLine(QLine(1000, 2000, 1800, 3500));
  16. }
To copy to clipboard, switch view to plain text mode 

see the attached results. Preview: preview.png, Print:print.png

what can I do to print colored lines? I could draw everything onto a QPixmap first and
print this QPixmap. But I think this may be too much memory-consuming, especially when printing in HighResolution mode...

thanks!
Felix