c++ - How to change fontsize on drawText? -

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qstring str = qstring::number((double)i, 'd', 1); painter->drawtext(100 + * 800/9 - 6, 910, 40, 40, 0, str );

i increase fontsize 2x showing?

you try (haven't compiled code see if works!):

qfont font = painter->font() ;  /* twice size current font size */ font.setpointsize(font.getpointsize() * 2);  /* set modified font painter */ painter->setfont(font);  /* draw text etc. */ painter.drawtext(....);

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