On 13.01.2007 06:32:15 Manuel Mall wrote: > While looking into the support for the Soft Hyphen the area of > hyphenation combined with kerning is causing me trouble. > > Aside 1: our fonts page claims we don't support kerning but I believe we > do.
Yes, we do. > Aside 2: Our tests are based on setting the base14kerning flag. I don't > think this flag is documented anywhere on the fop site. Can it be set > in the config file? Not yet, no, only through the FopFactory. > I wrote a simple test under fop 0.93 and noticed that the ipd of text > areas with the combination of kerning and hyphenation are not correctly > calculated (at least I think so). With the Base 14 sans-serif font at > 20pt we get: > > Word "vanda" alone on a line: ipd=53980 > Word "vandavanda" alone on a line: ipd=107560 (53980+53980-400) > Word "vandavandavanda" alone on a line: ipd=161140 > (53980+53980+53980-400-400) > If we now take the word "vandavandavandavanda" and get it hyphenated > after the 3rd "vanda" the line containing "vandavandavanda-" reports an > ipd of 168800 which is incorrect. I think it should be 161140 + 6660 > (width of hyphen) = 167800. I think you mean it is 168600 (that's what I get) and it should be 167800, which is a difference of 800mpt. 800mpt looks much like two times 400mpt kerning which are not removed from the area objects's IPD for the break at a hyphenation point. However, I'd expect a difference of only 400mpt, not 800mpt. I did fix [1] the behaviour for that condition so the layout looks correct, but apparently I didn't adjust the IPD for the area object. [1] http://svn.apache.org/viewvc?rev=407774&view=rev > Before I investigate this more can someone else check this and see if > they get similar results. > > I have attached the test case I have constructed. > > Manuel > > > Jeremias Maerki
