Try this

Qt Code: 
  1. void edpForm::paintEvent(QPaintEvent *event)
  2. {
  3.       double angle;
  4.       QPainter painter( this );
  5.  
  6.       for( n = 0; n < paintLines.count(); ++n )  {
  7.               k = paintLines[n];
  8.               temp = k.split( "," );
  9.               xs = temp[0].toInt( &ok );
  10.               ys = temp[1].toInt( &ok );
  11.               xe = temp[2].toInt( &ok );
  12.               ye = temp[3].toInt( &ok );
  13.               painter.drawLine(  xs, ys, xe, ye );
  14.        }
  15.  
  16.       for( n = 0; n < paintLabels.count(); ++n )  {
  17.               k = paintLabels[n];
  18.               temp = k.split( "," );
  19.               xs = temp[0].toInt( &ok );
  20.               ys = temp[1].toInt( &ok );
  21.               angle = temp[2].toDouble( &ok );           
  22.  
  23.              painter.save(); 
  24.  
  25.               painter.translate( xs, ys );
  26.               painter.rotate( angle );
  27.               painter.drawText(  0, 0,  temp[3] );
  28.               //painter.drawText( xs, ys, temp[3] );
  29.  
  30.               painter.restore();
  31.        }
  32. }
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