Merge with master

[lilypond.git] / lily / arpeggio.cc

diff --git a/lily/arpeggio.cc b/lily/arpeggio.cc
index b05187d8050e5f032defccc062a3a9eafa0121a5..234dbc44e3bd2575b9ffc5b87f9284ad49d7c4dc 100644 (file)
--- a/lily/arpeggio.cc
+++ b/lily/arpeggio.cc
@@ -1,50 +1,158 @@
-/*   
-  arpegggio.cc -- implement Arpeggio
+/*
+  arpeggio.cc -- implement Arpeggio
 
   source file of the GNU LilyPond music typesetter
-  
-  (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
- */
 
-#include "molecule.hh"
-#include "paper-def.hh"
-#include "lookup.hh"
+  (c) 2000--2007 Jan Nieuwenhuizen <janneke@gnu.org>
+*/
+
 #include "arpeggio.hh"
-#include "score-element.hh"
+
+#include "grob.hh"
+#include "output-def.hh"
 #include "stem.hh"
 #include "staff-symbol-referencer.hh"
+#include "staff-symbol.hh"
+#include "warn.hh"
+#include "font-interface.hh"
+#include "lookup.hh"
+#include "pointer-group-interface.hh"
 
-bool
-Arpeggio::has_interface (Score_element* me)
+MAKE_SCHEME_CALLBACK (Arpeggio, print, 1);
+SCM
+Arpeggio::print (SCM smob)
 {
-  return me && me->has_interface (ly_symbol2scm ("arpeggio-interface"));
+  Grob *me = unsmob_grob (smob);
+
+  Grob *common = me;
+
+  extract_grob_set (me, "stems", stems);
+  for (vsize i = 0; i < stems.size (); i++)
+    {
+      Grob *stem = stems[i];
+      common = common->common_refpoint (Staff_symbol_referencer::get_staff_symbol (stem),
+                                       Y_AXIS);
+    }
+
+  /*
+    TODO:
+
+    Using stems here is not very convenient; should store noteheads
+    instead, and also put them into the support. Now we will mess up
+    in vicinity of a collision.
+
+  */
+  Interval heads;
+  Real my_y = me->relative_coordinate (common, Y_AXIS);
+
+  for (vsize i = 0; i < stems.size (); i++)
+    {
+      Grob *stem = stems[i];
+      Grob *ss = Staff_symbol_referencer::get_staff_symbol (stem);
+      Interval iv = Stem::head_positions (stem);
+      iv *= Staff_symbol::staff_space (ss) / 2.0;
+
+      heads.unite (iv + ss->relative_coordinate (common, Y_AXIS)
+                  - my_y);
+    }
+
+  if (heads.is_empty () || heads.length () < 0.5)
+    {
+      if (!to_boolean (me->get_property ("transparent")))
+       {
+         me->warning ("no heads for arpeggio found?");
+         me->suicide ();
+       }
+      return SCM_EOL;
+    }
+
+  SCM ad = me->get_property ("arpeggio-direction");
+  Direction dir = CENTER;
+  if (is_direction (ad))
+    dir = to_dir (ad);
+
+  Stencil mol;
+  Font_metric *fm = Font_interface::get_default_font (me);
+  Stencil squiggle = fm->find_by_name ("scripts.arpeggio");
+
+  Stencil arrow;
+  if (dir)
+    {
+      arrow = fm->find_by_name ("scripts.arpeggio.arrow." + to_string (dir));
+      heads[dir] -= dir * arrow.extent (Y_AXIS).length ();
+    }
+
+  for (Real y = heads[LEFT]; y < heads[RIGHT];
+       y += squiggle.extent (Y_AXIS).length ())
+    mol.add_at_edge (Y_AXIS, UP, squiggle, 0.0);
+
+  mol.translate_axis (heads[LEFT], Y_AXIS);
+  if (dir)
+    mol.add_at_edge (Y_AXIS, dir, arrow, 0);
+
+  return mol.smobbed_copy ();
 }
 
-MAKE_SCHEME_CALLBACK (Arpeggio, brew_molecule, 1);
-SCM 
-Arpeggio::brew_molecule (SCM smob) 
+/* Draws a vertical bracket to the left of a chord
+   Chris Jackson <chris@fluffhouse.org.uk> */
+
+MAKE_SCHEME_CALLBACK (Arpeggio, brew_chord_bracket, 1);
+SCM
+Arpeggio::brew_chord_bracket (SCM smob)
 {
-  Score_element *me = unsmob_element (smob);
-  
-  Interval iv; 
-  for (SCM s = me->get_elt_property ("stems"); gh_pair_p (s); s = gh_cdr (s))
+  Grob *me = unsmob_grob (smob);
+  Grob *common = me;
+
+  extract_grob_set (me, "stems", stems);
+  for (vsize i = 0; i < stems.size (); i++)
     {
-      Score_element *stem = unsmob_element (gh_car (s));
-      iv.unite (Stem::head_positions (stem));
+      Grob *stem = stems[i];
+      common = common->common_refpoint (Staff_symbol_referencer::get_staff_symbol (stem),
+                                       Y_AXIS);
     }
 
-  Molecule mol;
-  Molecule arpeggio = me->paper_l ()->lookup_l (0)->afm_find ("scripts-arpeggio");
-  Real staff_space = Staff_symbol_referencer::staff_space (me);
-  for (int i = (int)iv[MIN]/ 2; i < (int)(iv[MAX] - 1)/ 2; i++)
+  Interval heads;
+  Real my_y = me->relative_coordinate (common, Y_AXIS);
+
+  for (vsize i = 0; i < stems.size (); i++)
     {
-      Molecule a (arpeggio);
-      a.translate_axis (i * staff_space, Y_AXIS);
-      mol.add_molecule (a);
+      Grob *stem = stems[i];
+      Grob *ss = Staff_symbol_referencer::get_staff_symbol (stem);
+      Interval iv = Stem::head_positions (stem);
+      iv *= Staff_symbol::staff_space (ss) / 2.0;
+      heads.unite (iv + ss->relative_coordinate (common, Y_AXIS) - my_y);
     }
-  mol.translate (Offset (-2 * staff_space, 0);
 
-  return mol.create_scheme (); 
+  Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
+  Real sp = 1.5 * Staff_symbol_referencer::staff_space (me);
+  Real dy = heads.length () + sp;
+  Real x = 0.7;
+
+  Stencil mol (Lookup::bracket (Y_AXIS, Interval (0, dy), lt, x, lt));
+  mol.translate_axis (heads[LEFT] - sp / 2.0, Y_AXIS);
+  return mol.smobbed_copy ();
+}
+
+/*
+  We have to do a callback, because print () triggers a
+  vertical alignment if it is cross-staff.
+*/
+MAKE_SCHEME_CALLBACK (Arpeggio, width, 1);
+SCM
+Arpeggio::width (SCM smob)
+{
+  Grob *me = unsmob_grob (smob);
+  Stencil arpeggio = Font_interface::get_default_font (me)->find_by_name ("scripts.arpeggio");
+
+  return ly_interval2scm (arpeggio.extent (X_AXIS));
 }
 
+ADD_INTERFACE (Arpeggio,
+              "Functions and settings for drawing an arpeggio symbol (a wavy line left to noteheads.",
+
+              /* properties */
+              "arpeggio-direction "
+              "stems "
+              "script-priority " // TODO: make around-note-interface
+              );