lilypond-1.3.96

diff --git a/lily/text-spanner.cc b/lily/text-spanner.cc
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+/*
+  text-spanner.cc -- implement Text_spanner
+
+  source file of the GNU LilyPond music typesetter
+
+  (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
+*/
+
+#include "molecule.hh"
+#include "text-spanner.hh"
+#include "spanner.hh"
+#include "lookup.hh"
+#include "dimensions.hh"
+#include "paper-def.hh"
+#include "debug.hh"
+#include "paper-column.hh"
+#include "staff-symbol-referencer.hh"
+
+/*
+  Generic Text spanner:
+
+  type: "line", "dashed-line", "dotted-line"
+  edge-text: ("le" . "re")
+  text-style: "italic"
+  egde-height: (lh . rh)
+
+  "le"--------------"re"
+                    |^ 
+                    |v rh
+
+  fine tuning:
+
+  dash-period 
+  dash-length 
+  line-thickness
+
+  TODO:
+    - vertical start / vertical end (fixme-name) |
+    - contination types (vert. star, vert. end)  |-> eat volta-spanner
+    - more styles
+    - more texts/positions
+    - style: hairpin ?
+ */
+
+MAKE_SCHEME_CALLBACK (Text_spanner, brew_molecule, 1);
+
+SCM
+Text_spanner::brew_molecule (SCM smob) 
+{
+  Score_element *me= unsmob_element (smob);
+  Spanner *spanner = dynamic_cast<Spanner*> (me);
+
+  Real staff_space = Staff_symbol_referencer::staff_space (me);
+  Real thickness = me->paper_l ()->get_var ("stafflinethickness");  
+  
+
+  Drul_array<bool> broken;
+  Direction d = LEFT;
+  do
+    {
+      Paper_column* s = dynamic_cast<Paper_column*>(spanner->get_bound (d)); // UGH
+      broken[d] = (!s->musical_b ());
+    }
+  while (flip (&d) != LEFT);
+  
+  SCM s = me->get_elt_property ("text-style");
+  String text_style = "italic";
+  if (gh_string_p (s))
+    text_style = ly_scm2string (s);
+ 
+  SCM edge_text = me->get_elt_property ("edge-text");
+  Drul_array<Molecule> edge;
+  if (gh_pair_p (edge_text))
+    {
+      Direction d = LEFT;
+      do
+       {
+         String text = ly_scm2string (index_cell (edge_text, d));
+         edge[d] = me->lookup_l ()->text (text_style, text, me->paper_l ());
+         if (!edge[d].empty_b ())
+           edge[d].align_to (Y_AXIS, CENTER);
+       }
+      while (flip (&d) != LEFT);
+    }
+
+  Drul_array<Real> shorten;
+  shorten[LEFT] = 0;
+  shorten[RIGHT] = 0;
+
+  s = me->get_elt_property ("shorten");
+  if (gh_pair_p (s))
+    {
+      shorten[LEFT] = gh_scm2double (gh_car (s)) * staff_space;
+      shorten[RIGHT] = gh_scm2double (gh_cdr (s)) * staff_space;
+    }
+
+  Real broken_left =  spanner->get_broken_left_end_align ();
+  Real width = spanner->spanner_length ();
+  Score_element *bnd = spanner->get_bound (RIGHT);
+  width += bnd->extent (bnd, X_AXIS).length ();
+  width -= broken_left;
+  width -= shorten[LEFT] + shorten[RIGHT];
+  width -= edge[LEFT].extent (X_AXIS).length ()
+    + edge[RIGHT].extent (X_AXIS).length ();
+
+  if (width < 0)
+    {
+      warning (_ ("Text_spanner too small"));
+      width = 0;
+    }
+
+
+  String type = "dashed-line";
+  s = me->get_elt_property ("type");
+  if (gh_string_p (s))
+    type = ly_scm2string (s);
+
+  Molecule line;
+  Drul_array<Molecule> edge_line;
+  if (type == "line"
+      || type == "dashed-line"
+      || type == "dotted-line")
+    {
+      Real thick = thickness;
+      s = me->get_elt_property ("line-thickness");
+      if (gh_number_p (s))
+       thick *= gh_scm2double (s);
+  
+      // maybe these should be in line-thickness?
+      Real length = staff_space;
+      s = me->get_elt_property ("dash-length");
+      if (gh_number_p (s))
+       length = gh_scm2double (s) * staff_space;
+
+      Real period = 2 * length + thick;
+      s = me->get_elt_property ("dash-period");
+      if (gh_number_p (s))
+       period = gh_scm2double (s) * staff_space;
+      
+      if (type == "dotted-line")
+       length = thick;
+       
+      if (type == "line")
+       length = period + thick;
+
+      Real on = length - thick;
+      Real off = period - on;
+
+      SCM list = gh_list (ly_symbol2scm ("dashed-line"),
+                         gh_double2scm (thick),
+                         gh_double2scm (on),
+                         gh_double2scm (off),
+                         gh_double2scm (width),
+                         gh_double2scm (0),
+                         SCM_UNDEFINED);
+
+      Box b (Interval (0, width), Interval (-thick / 2, thick / 2));
+      line = Molecule (b, list);
+
+      s = me->get_elt_property ("edge-height");
+      if (gh_pair_p (s))
+       {
+         Direction d = LEFT;
+         int dir = me->get_elt_property ("direction");
+         do
+           {
+             Real dy = gh_scm2double (index_cell (s, d)) * - dir;
+             if (dy)
+               {
+                 SCM list = gh_list (ly_symbol2scm ("dashed-line"),
+                                     gh_double2scm (thick),
+                                     gh_double2scm (on),
+                                     gh_double2scm (off),
+                                     gh_double2scm (0),
+                                     gh_double2scm (dy),
+                                     SCM_UNDEFINED);
+                 
+                 Box b (Interval (0, thick),
+                        dy > 0
+                        ? Interval (0, dy)
+                        : Interval (dy, 0));
+                 edge_line[d] = Molecule (b, list);
+               }
+           }
+         while (flip (&d) != LEFT);
+       }
+    }
+
+  Molecule m;
+  if (!edge[LEFT].empty_b ())
+    m = edge[LEFT];
+
+  if (!edge_line[LEFT].empty_b ())
+    m.add_at_edge (X_AXIS, RIGHT, edge_line[LEFT], 0);
+  if (!line.empty_b ())
+    m.add_at_edge (X_AXIS, RIGHT, line, 0);
+  if (!edge_line[RIGHT].empty_b ())
+    m.add_at_edge (X_AXIS, RIGHT, edge_line[RIGHT], 0);
+  if (!edge[RIGHT].empty_b ())
+    m.add_at_edge (X_AXIS, RIGHT, edge[RIGHT], 0);
+  m.translate_axis (broken_left, X_AXIS);
+
+  return m.create_scheme ();
+}
+
+