lily/system-start-delimiter.cc

   1 /*
   2   system-start-delimiter.cc --  implement System_start_delimiter
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9 #include <math.h>
  10
  11 #include "axis-group-interface.hh"
  12 #include "system-start-delimiter.hh"
  13 #include "paper-def.hh"
  14 #include "molecule.hh"
  15 #include "lookup.hh"
  16 #include "all-font-metrics.hh"
  17 #include "score-element.hh"
  18
  19 Molecule
  20 System_start_delimiter::staff_bracket (Score_element*me,Real height)
  21 {
  22   Paper_def* p= me->paper_l ();
  23   SCM scmss = p->get_scmvar ("staffspace");
  24   Real ss = gh_scm2double (scmss);
  25   Real arc_height = gh_scm2double (me->get_elt_property("arch-height")) * ss ;
  26
  27   SCM at = gh_list (ly_symbol2scm ("bracket"),
  28                     scm_product (me->get_elt_property ("arch-angle"), scmss),
  29                     scm_product (me->get_elt_property ("arch-width"), scmss),
  30                     gh_double2scm (arc_height),
  31                     scm_product (me->get_elt_property ("bracket-width"),scmss),
  32                     gh_double2scm (height),
  33                     scm_product (me->get_elt_property ("arch-thick"),scmss),
  34                     scm_product (me->get_elt_property ("bracket-thick"),scmss),
  35                     SCM_UNDEFINED);
  36
  37   Real h = height + 2 * arc_height;
  38   Box b (Interval (0, 1.5 * ss), Interval (-h/2, h/2));
  39   Molecule mol (b, at);
  40   mol.align_to (X_AXIS, CENTER);
  41   return mol;
  42 }
  43
  44 void
  45 System_start_delimiter::set_interface (Score_element*me)
  46 {
  47   me->set_extent_callback (0, Y_AXIS);
  48   Pointer_group_interface (me).set_interface();
  49   me->set_interface (ly_symbol2scm ("system-start-delimiter-interface"));
  50 }
  51
  52 bool
  53 System_start_delimiter::has_interface (Score_element*me)
  54 {
  55   return  me->has_interface (ly_symbol2scm ("system-start-delimiter-interface"));
  56 }
  57
  58 Molecule
  59 System_start_delimiter::simple_bar (Score_element*me,Real h)
  60 {
  61   Real w = me->paper_l ()->get_var ("stafflinethickness") *
  62     gh_scm2double (me->get_elt_property ("thickness"));
  63   return me->lookup_l ()->filledbox (Box (Interval(0,w), Interval(-h/2, h/2)));
  64 }
  65
  66 MAKE_SCHEME_CALLBACK(System_start_delimiter,after_line_breaking);
  67
  68 SCM
  69 System_start_delimiter::after_line_breaking (SCM smob)
  70 {
  71   try_collapse (unsmob_element (smob));
  72   return SCM_UNSPECIFIED;
  73 }
  74
  75 void
  76 System_start_delimiter::try_collapse (Score_element*me)
  77 {
  78   SCM   gl = me->get_elt_property ("glyph");
  79
  80   if (scm_ilength (me->get_elt_property ("elements")) <=  1 && gl == ly_symbol2scm ("bar-line"))
  81     {
  82       me->suicide ();
  83     }
  84
  85 }
  86
  87
  88 MAKE_SCHEME_CALLBACK(System_start_delimiter,brew_molecule);
  89
  90 SCM
  91 System_start_delimiter::brew_molecule (SCM smob)
  92 {
  93   Score_element * me = unsmob_element (smob);
  94   Interval ext = Axis_group_interface::group_extent_callback (me, Y_AXIS);
  95   Real l = ext.length ();
  96   Molecule m;
  97
  98   SCM s = me->get_elt_property ("collapse-height");
  99   if (gh_number_p (s) && l < gh_scm2double (s))
 100     {
 101       me->suicide();
 102       return SCM_EOL;
 103     }
 104
 105   s = me->get_elt_property ("glyph");
 106   if (!gh_symbol_p(s))
 107     return SCM_EOL;
 108
 109   if (s == ly_symbol2scm ("bracket"))
 110     m = staff_bracket (me,l);
 111   else if (s == ly_symbol2scm ("brace"))
 112     m =  staff_brace (me,l);
 113   else if (s == ly_symbol2scm ("bar-line"))
 114     m = simple_bar (me,l);
 115
 116
 117   m.translate_axis (ext.center (), Y_AXIS);
 118   return m.create_scheme ();
 119 }
 120
 121 /*
 122   Ugh. Suck me plenty.
 123  */
 124 Molecule
 125 System_start_delimiter::staff_brace (Score_element*me,Real y)
 126 {
 127   Real staffht  = me->paper_l ()->get_var ("staffheight");
 128   int staff_size  = int (rint (staffht ));
 129
 130   // URG
 131   Real step  = 1.0;
 132   int minht  = 2 * staff_size;
 133   int maxht = 7 *  minht;
 134   int idx = int (((maxht - step) <? y - minht) / step);
 135   idx = idx >? 0;
 136
 137   SCM l = scm_assoc (ly_str02scm ("brace"),
 138                      scm_eval (ly_symbol2scm ("cmr-alist")));
 139
 140   String nm = "feta-braces";
 141   if (l != SCM_BOOL_F)
 142     nm = ly_scm2string (gh_cdr (l));
 143   nm += to_str (staff_size);
 144   SCM e =gh_list (ly_symbol2scm ("char"), gh_int2scm (idx), SCM_UNDEFINED);
 145   SCM at = (e);
 146
 147   at = fontify_atom (find_font (nm), at);
 148
 149   Box b (Interval (0,0), Interval (-y/2, y/2));
 150
 151   return Molecule(b, at);
 152 }
 153