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From Simon Pepping <spepp...@leverkruid.eu>
Subject Re: [Xmlgraphics-fop Wiki] Update of "GoogleSummerOfCode2006/FloatsImplementationProgress/ImplementingSideFloats" by VincentHennebert
Date Mon, 14 Aug 2006 20:01:51 GMT

This page represents a good piece of work.

First some nit picking regarding language:

'A, if X; B, else': change else -> otherwise (2x)

'We may choose to either differ a side-float, or ...': change differ -> defer

Then a comment on the rules:

Rule 1. Why does the rule not require not both x >= 0 and x + ipd <=
ipd(ref-area), for both start and end floats, unless the float is
wider than the ipd(ref-area)? In other words, why is rule 7 not
required for any start and end floats?

In 'Properties of the model': I do not see that rule 7 is satisfied.

Finally some thoughts on a possible algorithm:

The algorithm should combine pagebreak and linebreak calculations in a
single dynamic calculation:

for each legal pagebreak
  for each active pagebreak node
    layout the page and calculate its demerits

Laying out the page involves breaking each paragraph on the page into
lines; each legal linebreak/active linebreak node combination (that
is, each iteration in the two nested loops of the linebreak
calculation) is associated with a certain side float layout, and thus
the line widths for that case are known and the demerits can be

It is just a rough idea. I have no clear picture what the linebreak
calculation in combination with side floats looks like. I just have
the feeling that it should be possible in principle. Obviously, it may
be necessary to break a paragraph into lines several times, each time
with a different side float layout. It will be necessary to store
earlier linebreak calculations for a paragraph in a clever way, so as
to avoid unnecessary recalculations for identical linewidths. Working
this out into a realistic algorithm requires much more thinking.

Regards, Simon

On Fri, Aug 11, 2006 at 01:26:51PM +0200, Vincent Hennebert wrote:
> 2006/8/11, Apache Wiki:
> >Dear Wiki user,
> >
> >You have subscribed to a wiki page or wiki category on "Xmlgraphics-fop 
> >Wiki" for change notification.
> >
> >The following page has been changed by VincentHennebert:
> >http://wiki.apache.org/xmlgraphics-fop/GoogleSummerOfCode2006/FloatsImplementationProgress/ImplementingSideFloats
> >
> >The comment on the change is:
> >Difficulties around side-floats


Simon Pepping
home page: http://www.leverkruid.eu

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