[Xr] Dealing with groups in Xr
dlazaro at acm.org
Wed Apr 23 10:08:37 PDT 2003
> BUT, beyond all of this, Keith has an interesting suggestion for the
> problem of the default unit. He proposed taking some nominal unit
> size, (some "point"), and rounding it up to the nearest device pixel
> size. That should meet help address the need for device independent
> metrics while still allowing alignment with the pixel grid, (which
> will remain important for some number of years).
> If I remember correctly, Keith got this idea from CSS. I haven't read
> that specification yet myself.
This is a possible reference:
http://www.w3.org/TR/REC-CSS2/syndata.html#length-units. It comes from
the CSS2 specification.
In this model the definition of a pixel is a relative unit that depends
on the viewers distance. It is a very good model for maintaining
relative sizes for web page elements.
I'm not defending the idea, though, because I feel that this abstraction
only makes sense in a limited context as web page rendering. I'll
develop an explanation when I find a little bit more of time.
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