lily/encompass-info.cc

   1 /*
   2   encompass-info.cc -- implement Encompass_info
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--1999 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8 */
   9
  10 #include "proto.hh"
  11 #include "stem.hh"
  12 #include "note-column.hh"
  13 #include "paper-def.hh"
  14 #include "encompass-info.hh"
  15 #include "slur.hh"
  16 #include "staff-symbol.hh"
  17 #include "note-head.hh"
  18 #include "debug.hh"
  19 #include "align-element.hh"
  20
  21 Encompass_info::Encompass_info ()
  22 {
  23   assert (0);
  24 }
  25
  26 Encompass_info::Encompass_info (Note_column const* note, Direction dir, Slur const* slur_l)
  27 {
  28   interstaff_f_ = 0;
  29
  30   Paper_def* paper = note->paper_l ();
  31
  32   // UGH
  33   Real notewidth = paper->note_width () * 0.8;
  34
  35
  36   Stem* stem_l = note->stem_l_;
  37   if (!stem_l)
  38     {
  39       warning ("Slur over rest?");
  40       o_[X_AXIS] = note->hpos_f ();
  41       return;
  42     }
  43
  44   Real internote = stem_l-> staff_line_leading_f ()/2.;
  45
  46   /*
  47     set o_[X_AXIS] to middle of notehead or on the exact position of stem,
  48     according to slur direction
  49    */
  50   o_[X_AXIS] = stem_l->hpos_f ();
  51
  52   /*
  53      stem_l->dir == dir
  54                       ________
  55            |   |     /        \
  56           x|  x|       |x  |x
  57         \________/     |   |
  58
  59    */
  60
  61   if (stem_l->dir_ != dir)
  62     o_[X_AXIS] -= 0.5 * notewidth * stem_l->dir_;
  63
  64   o_[Y_AXIS] = stem_l->extent (Y_AXIS)[dir];
  65   /*
  66    leave a gap: slur mustn't touch head/stem
  67    */
  68   o_[Y_AXIS] += 2.5 * internote * dir;
  69
  70   if (stem_l->dir_ != dir)
  71     o_[Y_AXIS] += 1.0 * internote * dir;
  72
  73
  74   Dimension_cache *common = stem_l->common_group (slur_l, Y_AXIS);
  75   Align_element * align = dynamic_cast<Align_element*> (common->element_l ());
  76   if (align && align->axis() == Y_AXIS)
  77     {
  78       if (align->threshold_interval_[MIN] !=
  79           align->threshold_interval_[MAX])
  80         warning (_ ("minVerticalAlign != maxVerticalAlign: interstaff beams/slurs may be broken"));
  81
  82       interstaff_f_ = align->threshold_interval_[MIN];
  83
  84       Dimension_cache * slur_refpoint = slur_l->dim_cache_[Y_AXIS];
  85       Dimension_cache * note_refpoint = note->dim_cache_[Y_AXIS];
  86
  87       while (slur_refpoint->parent_l_ != common)
  88         slur_refpoint = slur_refpoint->parent_l_;
  89       while (note_refpoint->parent_l_ != common)
  90         note_refpoint = note_refpoint->parent_l_;
  91
  92
  93       int slur_prio =
  94         align->get_priority (dynamic_cast<Score_element*> (slur_refpoint->element_l ()));
  95       int stem_prio =
  96         align->get_priority (dynamic_cast<Score_element*> (note_refpoint->element_l ()));
  97
  98       /*
  99         our staff is lower -> interstaff_f_ *= -1
 100        */
 101
 102       if (slur_prio < stem_prio)
 103         interstaff_f_ *= -1;
 104       o_[Y_AXIS] += interstaff_f_;
 105     }
 106 }