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Re: [platform-swt-dev] Precise font metrics
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Hi Stephan,
I'm not sure if it's suitable for your requirements, but I recently had a problem with metrics for strings without ascenders/descenders etc, that I needed to fit within pre-determined vertical bounds so I wrote a small method that uses a very
simplistic approach to work out the exact height of the actual rendered text for a specific string.
It can be used to select the correct font size for the height you require in combination with the other code on this page;
http://stackoverflow.com/questions/5829703/java-getting-a-font-with-a-specific-height-in-pixels/7737840#7737840
I hope you find it useful.
Sincerely,
Rob
Stephan Aßmus <superstippi@xxxxxx>
Sent by: platform-swt-dev-bounces@xxxxxxxxxxx
To
platform-swt-dev@xxxxxxxxxxx
24/10/2011 15:38 cc
Subject
Please respond to [platform-swt-dev] Precise font metrics
"Eclipse Platform SWT component developers list." <platform-swt-dev@xxxxxxxxxxx>
Hi all,
The FontMetrics class only returns rounded int values for ascent,
descent and leading values, but I need to know the precise floating
point measurements.
I've searched the web for a solution to this problem, but even though I
think people would stumble over this issue more frequently, I have found
nothing helpful.
Basically, my situation is this. I am working on an SWT/JFace
application where the user can edit large rich text documents (WYSIWYG
in pages). To support this we developed a new styled text document model
with a LineStyleListener based adapter to the SWT StyledText control.
The StyledText control itself and the LineStyleListener interface needed
heavy modifications for all the features that we needed. In principle we
would be willing to donate the related code. At least when I initially
researched rich text editing, it appeared many developers were also in
need for a powerful framework similar to what is available in Swing. One
problem with me donating code could be that I can't promise to maintain
anything. But if there were plans already to offer a rich text framework
in JFace/SWT that is not focussed on editing code so much as is current
JFace/Text, it may be a good starting point.
Anyway, after not paying it enough attention for the longest time, I was
looking into more precise text rendering and comparing the amount of
glyphs per line and number of lines per page with other text packages
and I am realizing that the rounding of the font metrics to integer
values could be posing quite a problem for my use case. Neither can I
control text rendering beyond anti-alisaing on/off, nor can I position
each line based on individual absolute rounding from the page top. So
the font metric rounding adds up and I end up fitting much less text on
a page compared to other professional text packages.
Can anyone provide some directions which I could investigate to solve
this problem? Thank you for any help!
Best regards,
-Stephan
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