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--2004 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 "stencil.hh"
  15 #include "font-interface.hh"
  16 #include "all-font-metrics.hh"
  17 #include "grob.hh"
  18 #include "staff-symbol-referencer.hh"
  19 #include "lookup.hh"
  20
  21 Stencil
  22 System_start_delimiter::staff_bracket (Grob*me,Real height)
  23 {
  24   Real arc_height = ly_scm2double (me->get_property ("arch-height")) ;
  25
  26   SCM at = scm_list_n (ly_symbol2scm ("bracket"),
  27                     me->get_property ("arch-angle"),
  28                     me->get_property ("arch-width"),
  29                     scm_make_real (arc_height),
  30                     scm_make_real (height),
  31                     me->get_property ("arch-thick"),
  32                     me->get_property ("thickness"),
  33                     SCM_UNDEFINED);
  34
  35 /*
  36 TODO: sort this out.
  37
  38 Another thing:
  39 In system-start-delimiter.cc I see the line
  40
  41   Real h = height + 2 * arc_height;
  42
  43 But I really think that you mean
  44
  45  Real h = height + 2 * arc_width;
  46
  47 (arc_height changes the x-axis-size of arc ; arc_width changes the
  48 y-axis-size)
  49 Will not fix it since I'm not sure.
  50
  51    */
  52
  53   Real h = height + 2 * arc_height;
  54   Box b (Interval (0, 1.5), Interval (-h/2, h/2));
  55   Stencil mol (b, at);
  56   mol.align_to (X_AXIS, CENTER);
  57   return mol;
  58 }
  59
  60
  61
  62 Stencil
  63 System_start_delimiter::simple_bar (Grob*me,Real h)
  64 {
  65   Real lt =me->get_paper ()->get_dimension (ly_symbol2scm ("linethickness")) ;
  66   Real w = lt * robust_scm2double (me->get_property ("thickness"), 1);
  67   return Lookup::round_filled_box (Box (Interval (0,w), Interval (-h/2, h/2)),
  68                                    lt);
  69 }
  70
  71 MAKE_SCHEME_CALLBACK (System_start_delimiter,after_line_breaking,1);
  72
  73 SCM
  74 System_start_delimiter::after_line_breaking (SCM smob)
  75 {
  76   Grob * me = unsmob_grob (smob);
  77   SCM   gl = me->get_property ("glyph");
  78   if (ly_equal_p (gl,scm_makfrom0str ("bar-line")))
  79     {
  80       int count = 0;
  81
  82       /*
  83         Get all coordinates, to trigger Hara kiri.
  84       */
  85       SCM elts = me->get_property ("elements");
  86       Grob *common = common_refpoint_of_list (elts, me, Y_AXIS);
  87       for (SCM s = elts; ly_pair_p (s); s = ly_cdr (s))
  88         {
  89           Interval v = unsmob_grob (ly_car (s))->extent (common, Y_AXIS);
  90
  91           if (!v.is_empty ())
  92             count ++;
  93         }
  94
  95
  96       if (count <=  1)
  97         {
  98           me->suicide ();
  99         }
 100     }
 101   return SCM_UNSPECIFIED;
 102 }
 103
 104
 105 MAKE_SCHEME_CALLBACK (System_start_delimiter,print,1);
 106 SCM
 107 System_start_delimiter::print (SCM smob)
 108 {
 109   Grob * me = unsmob_grob (smob);
 110
 111   SCM s = me->get_property ("glyph");
 112   if (!ly_string_p (s))
 113     return SCM_EOL;
 114   SCM gsym = scm_string_to_symbol (s) ;
 115
 116   Real staff_space = Staff_symbol_referencer::staff_space (me);
 117   Interval ext = ly_scm2interval (Axis_group_interface::group_extent_callback
 118  (me->self_scm (), scm_int2num (Y_AXIS)));
 119   Real l = ext.length () / staff_space;
 120
 121   if (ext.is_empty ()
 122       || (robust_scm2double (me->get_property ("collapse-height"), 0.0) >= l))
 123     {
 124       me->suicide ();
 125       return SCM_EOL;
 126     }
 127
 128   Stencil m;
 129
 130   if (gsym== ly_symbol2scm ("bracket"))
 131     m = staff_bracket (me,l);
 132   else if (gsym == ly_symbol2scm ("brace"))
 133     m =  staff_brace (me,l);
 134   else if (gsym == ly_symbol2scm ("bar-line"))
 135     m = simple_bar (me,l);
 136
 137   m.translate_axis (ext.center (), Y_AXIS);
 138   return m.smobbed_copy ();
 139 }
 140
 141 Stencil
 142 System_start_delimiter::staff_brace (Grob*me, Real y)
 143 {
 144   Font_metric *fm = 0;
 145
 146   /* We go through the style sheet to lookup the font file
 147      name.  This is better than using find_font directly,
 148      esp. because that triggers mktextfm for non-existent
 149      fonts. */
 150   SCM fam = scm_cons (ly_symbol2scm ("font-encoding"), ly_symbol2scm ("braces"));
 151
 152   SCM alist = scm_list_n (fam, SCM_UNDEFINED);
 153   fm = select_font (me->get_paper (), scm_list_n (alist, SCM_UNDEFINED));
 154
 155
 156   int lo = 0;
 157
 158   int hi = (fm->count () - 1) >? 2;
 159   Box b;
 160
 161   /* do a binary search for each Y, not very efficient, but passable?  */
 162   do
 163     {
 164       int cmp = (lo + hi) / 2;
 165       b = fm->get_indexed_char (cmp);
 166       if (b[Y_AXIS].is_empty () || b[Y_AXIS].length () > y)
 167         hi = cmp;
 168       else
 169         lo = cmp;
 170     }
 171   while (hi - lo > 1);
 172
 173   Stencil m (fm->get_indexed_char_stencil (lo)); // ugh.  ascii?
 174   b=m.extent_box ();
 175   b[X_AXIS] = Interval (0,0);
 176
 177   return Stencil (b, m.get_expr ());
 178 }
 179
 180
 181
 182
 183 ADD_INTERFACE (System_start_delimiter,"system-start-delimiter-interface",
 184                "The brace, bracket or bar in front of the system. "
 185                "It is implemented as a spanner."
 186                ,
 187                "collapse-height thickness "
 188                "arch-height arch-angle arch-thick arch-width bracket-thick glyph");