On 03/03/11 20:18, Andreas Delmelle wrote:
> On 03 Mar 2011, at 13:08, Vincent Hennebert wrote:
>
>>> Unless ... the viewport is where the actual rotation takes place.
>>> IIC, the region-viewport's before-edge is still parallel to the
>>> page-reference-area's before edge. The before-edge of the
>>> region-reference-area, however, is the one that is rotated another 90
>>> degrees...
>>
>> See the following sentence in Section 6.4.15, “fo:region-before”:
>> “The reference-orientation and writing-mode of the
>> region-viewport-area are determined by the formatting object that
>> generates the area (see 6.4.5 fo:page-sequence). The
>> reference-orientation of the region-reference-area is set to "0" and
>> is, therefore, the same as the orientation established by the
>> region-viewport-area. The writing-mode of the region-reference-area
>> is set to the same value as that of the region-viewport-area.”
>>
>> So the region-reference-area has the same orientation as the
>> page-viewport-area.
>
> Let's assume that this refers to the default/normal situation. After all, we
> are quoting the _general_ fo:region-before definition (= where no deviating
> reference-orientation has been specified on the region). I would not believe
> anyone claiming that this definition was written with the intention of
> covering all possible combinations of reference-orientation/writing-mode.
I’m not sure I’m following. The specification is supposed to cover all
cases, isnt’it?
> The general definition just states the normal behavior: if no deviating
> reference-orientation has been specified, the region-reference-area will have
> the same orientation as the viewport.
>
> The definition of reference-orientation (7.21.3) states that a value of '90'
> means that "the reference-orientation of this *reference-area* is rotated 90
> degrees counter-clockwise from the reference-orientation of the *containing
> reference-area*."
Exactly. So the reference-orientation of the region-viewport-area is
rotated from the reference-orientation of the page-reference-area.
> So, specifying reference-orientation="90" on the region rotates its
> reference-area by 90 degrees from the page-reference-area. Nothing is said
> about the viewport here, mind you.
There is, see Section 6.4.15, “fo:region-before”:
“The reference-orientation and writing-mode of the
region-viewport-area are determined by the formatting object that
generates the area (see 6.4.5 fo:page-sequence).”
> It is in the viewport that a new coordinate system is established, not
> 'around' it, so to speak. The before-edge still remains in parallel with the
> page-reference-area's before-edge, when looking at it from the parent.
> Inside the viewport, before/after/start/end get different meanings, for the
> placement/dimensions of the child (reference-area).
I’m a bit puzzled. Did you see this paragraph from my first message?
“[...] Because, as explained in Section 4.2.3, “Geometric
Definitions”, the definition of the before/after/start/end-edges of
the content-rectangle of an area uses the
inline/block-progression-direction of that area; Whereas the
border/padding/allocation-rectangles use the directions of the
parent area.”
> Regards,
>
> Andreas
> ---
Thanks,
Vincent
