Hi Jim,
interesting read. I guess I learned more about the topic than I can
help. Also found this resource interesting:
http://kynosarges.de/GuiDpiScaling.html
Some thoughts. Obviously it is less desirable to require every
application to do their own scaling. I can't imagine that this would
work on a larger basis. As to the question of integer vs float
coordinates, there is a lot of snapToPixel stuff going on. And one of
the reasons is to get crisp pixel-aligned lines. Snapping to logical
coordinates could then snap to non-integer physical coordinates (if the
scaling factor is 125% or somesuch). Which may be ok if hidpi makes up
for it...
As to em-based styling, I was under the impression that there was a
constant factor for 1em. Reading section "RESIZING FOR DIFFERENT SCREEN
DPI" in modena.css I am not so sure anymore. The resource above also is
unsure (FWIW):
"JavaFX em handling is inconsistent, sometimes referring to the
automatically acquired system font but at other times yielding a
hard-coded default size."
Finally, it would be nice to get information about the actual screen
DPI. In my tests Screen.getDpi always returns 96, regardless of what it
actually is...
Werner
