Qpainter, Drawing text in reverse color

[Hariprasasth]

Hello,

I am using QBitmap and QPainter to draw a text with underline option.

I am implementing two cases: 1. Draw text 2. Draw text in reversed/inverted color - both text and background

Problem here is, when I reverse the background and pen color the underline is not drawn.

   QBitmap m_hBitmap(476,568);
   QPen m_hPen(Qt::SolidLine);
   QBrush	m_hBrush(Qt::SolidPattern);
   QPainter m_hdcMem;
   QImage image;

   //Initialize QPainter with Bitmap
   m_hBitmap.clear();
   m_hdcMem.begin(&m_hBitmap);
   m_hdcMem.setBackgroundMode(Qt::OpaqueMode);

   //Initialize Brush & Pen
   m_hBrush.setColor(Qt::color1);
   m_hPen.setWidth(2);//1
   m_hPen.setColor(Qt::color1);
   m_hPen.setCapStyle(Qt::FlatCap);
   m_hPen.setJoinStyle(Qt::MiterJoin);

   //Set to QPainter
   m_hdcMem.setPen(m_hPen);
   m_hdcMem.setBrush(m_hBrush);

   //Draw text
   //Normal
   QRect rect(50,50,125,100);
   QRect rect_rev(50,150,125,100);

   QFont font;
   font.setFamily(QString("Liberation Sans"));
   font.setBold(false);
   font.setUnderline(true);
   m_hdcMem.setFont(font);
   m_hdcMem.drawText(rect,QString("My test text"));


   //Reverse the backgrond & text color
   if(m_hBrush.color()!=Qt::color1)
       m_hBrush.setColor(Qt::color0);
   else
       m_hBrush.setColor(Qt::color1);
   m_hdcMem.setBrush(m_hBrush);
   m_hdcMem.setBackground(m_hBrush);

   if(m_hPen.color()!=Qt::color1)
       m_hPen.setColor(Qt::color1);
   else
       m_hPen.setColor(Qt::color0);
   m_hdcMem.setPen(m_hPen);
   m_hdcMem.drawText(rect_rev,QString("My test text"));

   //Save as image
   image = m_hBitmap.toImage();
   image.save("test1.bmp",0,-1); //Testing

   //end
   if(m_hBitmap.isNull()!= true && m_hdcMem.isActive()){
       m_hdcMem.end();
   }
   m_hBitmap.clear();

 image url)

Could someone help me on this?

Best regards,
Hari

[J.Hilk]

@Hariprasasth
no, I think the underline is there, in white, right at the edge of the image, that sits on a white background.

That's why you don't see it :P

[Hariprasasth]

@J-Hilk You are right. I am implementing like below picture. Could you give some ideas to do that?


[mrjj]

Hi
Could you not just make the bg rect slightly bigger ?
QRect rect_rev(50,150,125,100+12);

[Hariprasasth]

@mrjj I tried its not working.

[mrjj]

@Hariprasasth
Hi
Its due to setBackground.

You can just cheat and fill the rect your self
.....
m_hdcMem.fillRect(rect_rev, m_hBrush); // fill it
m_hdcMem.drawText(rect_rev,QString("My test text"));

You can use FontMetric class to get the rect needed for the text-only.