lily/idealspacing.cc

   1 /*
   2   idealspacing.cc -- implement Idealspacing
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996, 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "idealspacing.hh"
  10 #include "paper-column.hh"
  11 #include "paper-score.hh"
  12 #include "debug.hh"
  13
  14 void
  15 Idealspacing::print() const
  16 {
  17 #ifndef NPRINT
  18   DEBUG_OUT << "idealspacing {" ;
  19   DEBUG_OUT << "distance " << space_f_ << " strength " << hooke_f_;
  20   DEBUG_OUT << "left " << cols_drul_[LEFT] << " right " << cols_drul_[RIGHT] << "}\n";
  21 #endif
  22 }
  23
  24 Idealspacing::Idealspacing()
  25 {
  26   space_f_ = 0.0;
  27   hooke_f_ = 0.0;
  28   cols_drul_[LEFT] = cols_drul_[RIGHT] = -1;
  29 }
  30
  31 void
  32 Idealspacing::OK() const
  33 {
  34   assert (hooke_f_ >= 0);
  35 }
  36
  37 Real
  38 Idealspacing::energy_f(Real x) const
  39 {
  40   Real dx = (space_f_ - x);
  41
  42   Real e =  sqr(dx);
  43   if ( dx < 0)
  44     e *= 4;                     // ugh.
  45
  46   return hooke_f_ * e;
  47 }