/*
This file is part of LilyPond, the GNU music typesetter.
- Copyright (C) 2007--2011 Joe Neeman <joeneeman@gmail.com>
+ Copyright (C) 2007--2015 Joe Neeman <joeneeman@gmail.com>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
+/*
+ Springs help chains of objects, such as the notes in a line of music,
+ distribute themselves evenly.
+ Each spring decides the length from the reference point of one object
+ along the line to the reference point of the next, based on a force
+ applied to the entire chain (see Spring::length() for details):
+ length = distance_ + flexibility * force
+
+ distance_ is the ideal separation between reference points
+ inverse_stretch_strength_ is the flexibility when the force is stretching
+ inverse_compress_strength_ is the flexibility when the force is compressing
+ min_distance_ sets a lower limit on length
+
+ Typically, the force applied to a list of objects ranges from about
+ -1 to about 1, though there are no set limits.
+*/
+
#include "spring.hh"
Spring::Spring ()
{
distance_ = max (min_distance_, distance_ * r);
inverse_compress_strength_ = max (0.0, distance_ - min_distance_);
- inverse_stretch_strength_ *= 0.8;
+ inverse_stretch_strength_ *= r;
update_blocking_force ();
}
blocking_force_ = -infinity_f;
min_distance_ = length (f);
- distance_ = max (distance_, min_distance_);
update_blocking_force ();
}