draw a string which fit all the width avaible

dridk2

Hi,
I would like to draw a string (using QPainter) which use all the width avaible by changing caracter spaces.
For exemple, with string A = "ACGT" and string B = "ACGTATGTAGTAGTAGTAGTAGTAGATTTGTATATTG"

+----------------WIDH----------------+
A         C           G            T  // string A
ACGTATGTAGTAGTAGTAGTAGTAGATTTGTATATTG // string B

Do you think there is a helper function to do that ? With paintText ? QTextOption ? AlignementFlags ?

mrjj

Hi
You can control the space with
http://doc.qt.io/qt-5/qfont.html#setKerning
so if you not require it to be perfect, you can quick make such function

QString StrSample = "TestMe" ;
  QRect r = QRect(0, 0, 190, 30);
  QFont font = painter.font();
  QFontMetrics fm(font);
  int tw = fm.width(StrSample);
  int diff = r.width() - tw;
  qreal lettersp = font.letterSpacing();
  qreal delta = diff / ( StrSample.length() - 1);
  font.setLetterSpacing(QFont::AbsoluteSpacing, lettersp + delta);
  painter.setFont(font);

There might be a Qt function that does it but im not stumbled upon it :)