QwtPlot::drawItems(...) using QRectF

[Pasquale T. <tri...@ps...>]

Hi,

I just updated to latest Qwt trunk v708, and noticed that now
QwtPlot::drawItems uses QRectF instead of the old QRect. Most code
compiled without need for any change, but I have some doubts:

1) in the old code, I was using, inside QwtPlot::drawItems, this line:
QPixmap * pm = new QPixmap(rect.size());
But now I had to change it to something like:
QPixmap * pm = new QPixmap(rect.width(),rect.height());
This pixmap is used to cache a QwtPlot rendered plot. Is this correct,
or should I round up or down the size?

2) old code:
painter->drawPixmap(QRect,QPixmap);
new code:
painter->drawPixmap(QRectF,QPixmap,QRectF);
is it OK to use the QRectF like this, or should I correct the sizes somehow?

3) for some reason a plotcurve is now offset by 2 pixel too low. I'm
not 100% positive this is related to the last Qwt update, but if so,
how could that be? I thought it could be related to some margins, or
to the fact that the QRectF has values (x,y) = (2,2), but could not
figure out how to fix this.

Thanks for all. If curious about the actual code, or the latest commit
with the changes, here it is:
http://orsa.git.sourceforge.net/git/gitweb.cgi?p=orsa/orsa;a=commitdiff;h=56f44e4a593c3369c5073b92631d2abdb7df8f83

Regards,

-- 
Pasquale Tricarico
Planetary Science Institute
http://orbit.psi.edu/~tricaric