I have a months-open bug. It took me forever to convince the trolls that it is
a bug. What I discovered is that it assumes 72dpi, rather than using the proper
DPI setting. Scaling your fonts by newDPI/72 *fontSize will get it to the
correct size. Note that when printing I only ever use pointSize, not pixelSize.
https://bugreports.qt.io/browse/QTBUG-45082
Though the bug description I think is some-what over limiting. I have it on
Linux too, where it was discovered. I don't know why/if it is limited to
widgets. But I wrote a trivial function to find the QLabels and such to adjust
their font size before rendering. (At this point in the discussion I should
mention I do my print-outs as widgets, with a widget heirarchy)
Code:
> > void PdfReport::fixFonts(QObject *w, QPaintDevice *pd) {
> > qreal ratio = pd->logicalDpiX() / 72.0;
> > fixFonts(w,ratio);
> > }
> >
> > void PdfReport::fixFonts(QObject *w, qreal ratio) {
> > foreach (QObject *c, w->children())
> > {
> > QString cname = c->metaObject()->className();
> > if (cname == "QLabel") {
> > QLabel *l = qobject_cast<QLabel*>(c);
> > if (l) {
> > QFont f = l->font();
> > f.setPointSize(f.pointSize()*ratio);
> > l->setFont(f);
> > }
> > }
> > fixFonts(c, ratio);
> > }
> > }
Sent: Wednesday, June 10, 2015 at 1:35 PM
From: "Edward Sutton" <[email protected]>
To: "Giuseppe D'Angelo" <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: [Interest] QPdfWriter - ability to embed XML?
Hi Giuseppe,
On Jun 10, 2015, at 11:57 AM, Giuseppe D'Angelo <[email protected]> wrote:
On Wed, Jun 10, 2015 at 6:51 PM, Edward Sutton
<[email protected][[email protected]]> wrote:
Crap. It looks like I could have used QPdfWriter on iOS and saved me a lot
of Objective-C headaches. I replaced QPrinter with QPdfWriter and it
basically seems to work except the fonts in the PDF are extremely tiny. I
may have to switch to QPdfWriter now.
This looks like a bug that should have been already solved in 5.4.x.
If not, please report it!
I am using Qt 5.5 RC snapshot.
Are you saying the *very* *small* font size is a possible bug?
I changed to using pointsize and now my drawn text is legible.
However all output rendered using QTextDocument::setHtml(“<h3>Hello
World</h3>”) still renders *very* *very* small.
I assumed the “tiny font” issue might be the result of QPdfWriter using point
size for fonts and QPrinter was using pixel size?
-Ed
--
Giuseppe D'Angelo
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