<AWT Dev> Instability of texts in Graphics2D imaging

[Phil Race]

2d-dev at openjdk.java.net is the right place for 2D, not AWT.
However this list and that list is are for people working
together on the implementation. Its not a developer forum
for users of the APIs. So if you have a patch to fix this then
2d-dev is the place. If you want to report a bug (but get no
support), go to bugs.sun.com .. if you'd like some support
from fellow developers you want the forum at
http://www.java.net/forums/javadesktop/java-desktop-technologies/java-2d
or
https://forums.oracle.com/forums/forum.jspa?forumID=938

If you'd like to pay, I'm sure Oracle has some options there too :-)

-phil.

On 3/14/12 5:18 PM, Herve Girod wrote:
> Hello,
>
> I don't know if it's the right place to post this, but in one of our
> applications we have a strange problem with texts when drawing Java2D
> images. Basically it is an application which draws a Graphics2D image
> with a rotation, the rotation quickly changing with time.
>
> There is s strange effect with characters when they rotate: it appears
> as if each character "was rotated seperately", there is a small
> discrepancy between the various characters of each String (they appear
> to lose their alignment during the movement, then they seem to
> realign), as if their position were computed separately or at
> different times. However, each String is rendered using the standard
> drawString method of the Graphics2D class.
>
> First we thought it could have been because of of the rendering hints
> we used, but we already used some of them (including antialiasing),
> and this effect does  not disappear even after setting various options
> (for example:  VALUE_FRACTIONALMETRICS_ON, VALUE_RENDER_QUALITY,
> VALUE_STROKE_PURE, VALUE_TEXT_ANTIALIAS_ON).
>
> The particularity of our use case is that :
> - the graphics are updated very quickly,
> - we are on Java 6 on a Windows machine (I did not try on Java 7)
> - the drawings is in fact performed inside Swing components
>
> My main question is: do I need to check closely our app to hunt for a
> problem in our part, or is it possible that this behavior may be
> linked to how Java draws Strings?
>
> Regards,
>
> Herve Girod