Thank you David! I think I should be able to work something out from here, I'll post again when I have some kind of update.
2018-02-06 11:04 GMT-03:00 David Nalesnik <david.nales...@gmail.com>: > Hi Stefano, > > > On Mon, Feb 5, 2018 at 11:53 PM, Stefano Troncaro > <stefanotronc...@gmail.com> wrote: > > David and Harm, I'm really impressed by the level of expertise you both > have > > showed in this thread. The function works wonderfully, and I'm really > > grateful for your help! > > > > I feel kind of bad for asking, but I'm stuck after trying to do what I > > thought would be a minor tweak. I wanted to make it so that the two lines > > that form the hairpin would end in the same vertical line, since when the > > hairpin is rotated the end-points of the two lines are displaced. I tried > > achieve this by drawing a white box that overlaps with the line that > > overextends, therefore "deleting" the excess. > > > > While I could not always place the box correctly, due to how > > ly:stencil-stack works (I don't explain this further because of the > > following), the real problem I found is that even when the box is > properly > > placed, the shortened line looks off. This is because Lilypond naturally > > makes line endings smooth, so the "cut the excess with a box" approach > > creates a hairpin with one line ending smoothly and the other ending > > harshly. This is less evident for thinner lines but is easy to see with > > thicker ones. Another flaw of this approach is that the white box > reserves > > unused space. > > > > So, with that in mind, I wonder: is there a way to smoothen the line > after > > "cutting" it (which I doubt) or, lacking that, is there a way to access > only > > one line of the hairpin to shorten it by the necessary amount? The later > I > > imagine like a Hairpin.shorten-pair that affects only one of the two > lines. > > Alternatively, is it more sensible to just draw the two lines and stack > them > > into a stencil? I have not yet tried this but the more I think about it > the > > more it looks like the most viable option. I tried to search the > definition > > of ly:hairpin::print to see how Lilypond does this, but I couldn't find > it. > > At this point I think you would get the best results by rewriting > ly:hairpin::print from scratch so that it has the existing > functionality with your enhancements worked in. > > At some point I translated the function from C++ into Scheme for some > experimentation. It's fairly direct. I found a version of this where > I left the original C++ code inlined as comments > (add-shorten-pair.ly). > > I used this as a preliminary to adding 'shorten-pair directly into the > C++ code, and I don't remember if I made improvements to the codebase > along the way... > > Hopefully, you can make use of it! > > I also located a file which shows what you can do from scratch: here > adjusting the size of the circle in the circled tip (not with > shorten-pair here...) FWIW. > > Hope this helps... > > David >
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