Re: Funding for Float support in FOP?
Vincent Hennebert writes: > On top of this, an implementation of the standard fo:float element > wouldn’t allow you to achieve the Sigplan layout you mentioned in this > other thread: > http://mail-archives.apache.org/mod_mbox/xmlgraphics-fop-users/201402.mbox/%3C87ob2mkv58.fsf%40sacrideo.us%3E Thanks. I'm aware that floats won't help me there. That was made clear to me from the outset, though I do wish they would. However, floats seem helpful in some other elements of handling DocBook documents. > All that said, implementing before-floats should be doable in the > current layout engine without too much effort. There’s a branch in > Subversion with the start of an implementation that would need to be > brought up-to-date, debugged, completed and cleaned up. I can’t say much > more without studying the problem in more details, but we are talking in > terms of weeks rather than months or years. Thanks for this information. I think it would be nice if FOP could get an extension to XSL-FO that would allow it to put "headers" or "footers" on specific pages and specific columns. I do not know if that is a feature generally desirable or not, but I know it would be nice for at least me. :-) On the other hand, I have a working workaround, so I'm not worried about it right now. -- Aaron W. Hsu | arcf...@sacrideo.us | http://www.sacrideo.us Please support my work: https://www.gittip.com/arcfide/ לֵ֤ב חֲכָמִים֙ בְּבֵ֣ית אֵ֔בֶל וְלֵ֥ב כְּסִילִ֖ים בְּבֵ֥ית שִׂמְחָֽה׃ - To unsubscribe, e-mail: fop-users-unsubscr...@xmlgraphics.apache.org For additional commands, e-mail: fop-users-h...@xmlgraphics.apache.org
Re: Funding for Float support in FOP?
On 13/02/14 18:29, Aaron W. Hsu wrote: Chris Bowditch writes: Assuming the prototype can be finished within say another 12 months, it would then take several further man years to port the rest of FOP's functionality onto the prototype. We estimate the implementation cost would be in the range of several hundred thousand GBP :-o This is why fo:float has not yet been implemented. Sorry to be the bearer of bad news. Thanks for the information. It's not bad news for me at all, but more just a data point. I wanted to see an actual estimate of just how difficult it is to add float support to FOP, and your estimate is quite helpful. I haven't read the specification myself, so I have no intuition about how crazy floats are, and it doesn't surprise me that a feature like this could take years to implement. On top of this, an implementation of the standard fo:float element wouldn’t allow you to achieve the Sigplan layout you mentioned in this other thread: http://mail-archives.apache.org/mod_mbox/xmlgraphics-fop-users/201402.mbox/%3C87ob2mkv58.fsf%40sacrideo.us%3E You can’t use side-float because you don’t know in which paragraph to put the anchor such that it would end up at the bottom of the first column. You can’t use before-float because it would flow up to the top of the page. Neither can you use a footnote, because it would take up the whole width of the page, so it would push both columns up. Plus in some cases it might be deferred to the next page. So to my knowledge your requirement is not achievable in plain XSL-FO. All that said, implementing before-floats should be doable in the current layout engine without too much effort. There’s a branch in Subversion with the start of an implementation that would need to be brought up-to-date, debugged, completed and cleaned up. I can’t say much more without studying the problem in more details, but we are talking in terms of weeks rather than months or years. Implementing side-floats is IMO not achievable without undertaking a major redesign of the layout engine. HTH, Vincent - To unsubscribe, e-mail: fop-users-unsubscr...@xmlgraphics.apache.org For additional commands, e-mail: fop-users-h...@xmlgraphics.apache.org
Re: Funding for Float support in FOP?
Chris Bowditch writes: > Assuming the prototype can be finished within say another 12 months, > it would then take several further man years to port the rest of FOP's > functionality onto the prototype. We estimate the implementation cost > would be in the range of several hundred thousand GBP :-o > > This is why fo:float has not yet been implemented. Sorry to be the > bearer of bad news. Thanks for the information. It's not bad news for me at all, but more just a data point. I wanted to see an actual estimate of just how difficult it is to add float support to FOP, and your estimate is quite helpful. I haven't read the specification myself, so I have no intuition about how crazy floats are, and it doesn't surprise me that a feature like this could take years to implement. -- Aaron W. Hsu | arcf...@sacrideo.us | http://www.sacrideo.us לֵ֤ב חֲכָמִים֙ בְּבֵ֣ית אֵ֔בֶל וְלֵ֥ב כְּסִילִ֖ים בְּבֵ֥ית שִׂמְחָֽה׃ - To unsubscribe, e-mail: fop-users-unsubscr...@xmlgraphics.apache.org For additional commands, e-mail: fop-users-h...@xmlgraphics.apache.org
Re: Funding for Float support in FOP?
Hi Aaron, Implementation of fo:float is one of the most trickest algorithms within the XSL-FO specification. Vincent H worked on a prototype layout engine that could accomodate fo:floats in 2008, but after 12 months we had to abandon it as it was still some distance from being finished. Thats just the prototype, and excluded all the output generation and many other features in FOP. Assuming the prototype can be finished within say another 12 months, it would then take several further man years to port the rest of FOP's functionality onto the prototype. We estimate the implementation cost would be in the range of several hundred thousand GBP :-o This is why fo:float has not yet been implemented. Sorry to be the bearer of bad news. Of course, I'm happy to learn if anyone has any idea how to implement a solution using the existing Knuth Layout Algorithm. Chris On 11/02/2014 03:47, Aaron W. Hsu wrote: It's nice that I've been able to work around the lack of floats in FOP for my sigplan article stylesheet, but it still irks me quite a bit. I don't have the time an inclination to fix the problem myself, given the lack of time and expertise in this area. However, I at least want to look into whether it might not be possible to support getting float support into FOP somehow. Thus, the following: Given appropriate amounts of funding, is there someone with the appropriate expertise willing to implement float support and the like in FOP? If so, what is the funding amount that would be necessary? I'm looking for honest answers here. I'm not sure I can raise this level of funding, but at the very least it would be good to know how much it would cost. I have enough people somewhat interested in this that it would make sense to make an effort if possible. - To unsubscribe, e-mail: fop-users-unsubscr...@xmlgraphics.apache.org For additional commands, e-mail: fop-users-h...@xmlgraphics.apache.org
