On Fri, Jul 15, 2016 at 9:48 AM, Andrew Bernard <andrew.bern...@gmail.com> wrote: > What does the property Beam.positions actually represent? I have seen code > that treats it as the y position coordinates of the end points of the beam,
If I recall correctly, in the case of Beam, 'positions represents the Y-coordinate of the vertical midpoint of the "0" beam, the beam which touches the endpoints of the outermost stems. Thankfully, in the case of Beam, this info is usable to get measurements of the beam you see. In the case of Slur, the positions numbers are instead used to select the closest "trial curve" out of a range of pre-calculated possibilities which Lilypond scores for appropriateness. Thus, they don't correlate with, say, control-points. What on earth is ‘beam::place-broken-parts-individually’ in the > context of beam start end vertical positioning? Dear me. When Beams are broken across systems there are several options for handling the slope and relative alignment of the Beam bits. I believe this oddly named callback has its origin in a attempt to support several distinguishable traditions of dealing with this: an Edition Peters style, and several others. You could check the issue tracker for more info. > > [I hate to continually complain about the IR manuals, and I dearly wish I > was in a position to understand this material enough to rewrite these > unclear sections, but I apologise, I don’t.] > Unfortunately, it is a matter of studying the code yourself, doing simple experiments, or asking on the lists where you likely be answered by someone who did just that to get whatever knowledge they have. (That includes me.) David _______________________________________________ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user