X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fstem-tremolo.cc;h=b3ea13d30d1f0fac3992b4ae9391e10b76e9f99f;hb=47db9a3883d726ca53e2133a3b2298f78dd6a32e;hp=2bfd4dfcbe423176dfff102c54b43dcfd362656f;hpb=105fd7580334c8f42838ac62504c5f290f3428c5;p=lilypond.git

diff --git a/lily/stem-tremolo.cc b/lily/stem-tremolo.cc
index 2bfd4dfcbe..9021642785 100644
--- a/lily/stem-tremolo.cc
+++ b/lily/stem-tremolo.cc
@@ -1,134 +1,353 @@
-/*   
-  stem-tremolo.cc --  implement Stem_tremolo
-  
-  source file of the GNU LilyPond music typesetter
-  
-  (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-  
- */
+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
+
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
+*/
 
 #include "stem-tremolo.hh"
-#include "debug.hh"
+
+#include "spanner.hh"
 #include "beam.hh"
-#include "paper-def.hh"
-#include "lookup.hh"
-#include "stem.hh"
+#include "directional-element-interface.hh"
 #include "item.hh"
+#include "lookup.hh"
+#include "note-collision.hh"
+#include "note-column.hh"
+#include "output-def.hh"
 #include "staff-symbol-referencer.hh"
-#include "directional-element-interface.hh"
-
-/*
-  TODO:
-    lengthen stem if necessary
- */
+#include "stem.hh"
+#include "warn.hh"
 
-void
-Stem_tremolo::set_interface (Score_element *me)
+MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_slope, 1)
+SCM
+Stem_tremolo::calc_slope (SCM smob)
 {
+  Grob *me = Grob::unsmob (smob);
+  Grob *stem = Grob::unsmob (me->get_object ("stem"));
+  Spanner *beam = Stem::get_beam (stem);
+
+  if (beam)
+    {
+      Real dy = 0;
+      SCM s = beam->get_property ("quantized-positions");
+      if (is_number_pair (s))
+        dy = - scm_to_double (scm_car (s)) + scm_to_double (scm_cdr (s));
+
+      Grob *s2 = Beam::last_normal_stem (beam);
+      Grob *s1 = Beam::first_normal_stem (beam);
+
+      Grob *common = s1->common_refpoint (s2, X_AXIS);
+      Real dx = s2->relative_coordinate (common, X_AXIS)
+                - s1->relative_coordinate (common, X_AXIS);
+
+      return scm_from_double (dx ? dy / dx : 0);
+    }
+  else
+    /* down stems with flags should have more sloped trems (helps avoid
+       flag/stem collisions without making the stem very long) */
+    return scm_from_double ((Stem::duration_log (stem) >= 3 && get_grob_direction (me) == DOWN)
+                            ? 0.40 : 0.25);
 }
 
+MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_width, 1)
+SCM
+Stem_tremolo::calc_width (SCM smob)
+{
+  Grob *me = Grob::unsmob (smob);
+  Grob *stem = Grob::unsmob (me->get_object ("stem"));
+  Direction dir = get_grob_direction (me);
+  bool beam = Stem::get_beam (stem);
+  bool flag = Stem::duration_log (stem) >= 3 && !beam;
+
+  /* beamed stems and up-stems with flags have shorter tremolos */
+  return scm_from_double (((dir == UP && flag) || beam) ? 1.0 : 1.5);
+}
 
-Interval
-Stem_tremolo::dim_callback (Score_element * se, Axis )
+MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_style, 1)
+SCM
+Stem_tremolo::calc_style (SCM smob)
 {
-  Real space = Staff_symbol_referencer::staff_space (se);
-  return Interval (-space, space);
+  Grob *me = Grob::unsmob (smob);
+  Grob *stem = Grob::unsmob (me->get_object ("stem"));
+  Direction dir = get_grob_direction (me);
+  bool beam = Stem::get_beam (stem);
+  bool flag = Stem::duration_log (stem) >= 3 && !beam;
+
+  return ly_symbol2scm (((dir == UP && flag) || beam) ? "rectangle" : "default");
 }
 
+Real
+Stem_tremolo::get_beam_translation (Grob *me)
+{
+  Grob *stem = Grob::unsmob (me->get_object ("stem"));
+  Spanner *beam = Stem::get_beam (stem);
 
+  return (beam && beam->is_live ())
+         ? Beam::get_beam_translation (beam)
+         : (Staff_symbol_referencer::staff_space (me)
+            * robust_scm2double (me->get_property ("length-fraction"), 1.0) * 0.81);
+}
 
-MAKE_SCHEME_CALLBACK(Stem_tremolo,brew_molecule);
-SCM
-Stem_tremolo::brew_molecule (SCM smob)
+Stencil
+Stem_tremolo::raw_stencil (Grob *me, Real slope, Direction dir)
 {
-  Score_element *me= unsmob_element (smob);
-  Score_element * stem = unsmob_element (me->get_elt_property ("stem"));
-  Score_element * beam = Stem::beam_l (stem);
-  
-  Real dydx;
-  if (beam)
-    {
-      Real dy = 0;
-      SCM s = beam->get_elt_property ("height");
-      if (gh_number_p (s))
-	dy = gh_scm2double (s);
-      Real dx = Beam::last_visible_stem (beam)->relative_coordinate (0, X_AXIS)
-	- Beam::first_visible_stem (beam)->relative_coordinate (0, X_AXIS);
-      dydx = dx ? dy/dx : 0;
-    }
-  else
-    // urg
-    dydx = 0.25;
+  Real ss = Staff_symbol_referencer::staff_space (me);
+  Real thick = robust_scm2double (me->get_property ("beam-thickness"), 1);
+  Real width = robust_scm2double (me->get_property ("beam-width"), 1);
+  Real blot = me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"));
+  SCM style = me->get_property ("style");
+  if (!scm_is_symbol (style))
+    style = ly_symbol2scm ("default");
 
-  Real ss = Staff_symbol_referencer::staff_space (stem);
-  Real thick = gh_scm2double (me->get_elt_property ("beam-thickness"));
-  Real width = gh_scm2double (me->get_elt_property ("beam-width"));
   width *= ss;
   thick *= ss;
-  
-  Molecule a (me->lookup_l ()->beam (dydx, width, thick));
-  a.translate (Offset (-width/2, width / 2 * dydx));
-  
-  int tremolo_flags;
-  SCM s = me->get_elt_property ("tremolo-flags");
-  if (gh_number_p (s))
-    tremolo_flags = gh_scm2int (s);
+
+  Stencil a;
+  if (style == ly_symbol2scm ("rectangle"))
+    a = Lookup::rotated_box (slope, width, thick, blot);
   else
-    // huh?
-    tremolo_flags = 1;
+    a = Lookup::beam (slope, width, thick, blot);
 
-  int mult = beam ? Beam::get_multiplicity (beam) : 0;
-  SCM space_proc = me->get_elt_property ("beam-space-function");
-  SCM space = gh_call1 (space_proc, gh_int2scm (mult));
-  Real interbeam_f = gh_scm2double (space) * ss;
+  a.align_to (X_AXIS, CENTER);
+  a.align_to (Y_AXIS, CENTER);
 
+  int tremolo_flags = robust_scm2int (me->get_property ("flag-count"), 0);
+  if (!tremolo_flags)
+    {
+      programming_error ("no tremolo flags");
 
-  Molecule mol; 
+      me->suicide ();
+      return Stencil ();
+    }
+
+  Real beam_translation = get_beam_translation (me);
+
+  Stencil mol;
   for (int i = 0; i < tremolo_flags; i++)
     {
-      Molecule b (a);
-      b.translate_axis (interbeam_f * i, Y_AXIS);
-      mol.add_molecule (b);
+      Stencil b (a);
+      b.translate_axis (beam_translation * i * dir * -1, Y_AXIS);
+      mol.add_stencil (b);
     }
-  if (tremolo_flags)
-    mol.translate_axis (-mol.extent (Y_AXIS).center (), Y_AXIS);
-  if (beam)
+  return mol;
+}
+
+MAKE_SCHEME_CALLBACK (Stem_tremolo, pure_height, 3);
+SCM
+Stem_tremolo::pure_height (SCM smob, SCM, SCM)
+{
+  Item *me = Item::unsmob (smob);
+
+  /*
+    Cannot use the real slope, since it looks at the Beam.
+   */
+  Stencil s1 (untranslated_stencil (me, 0.35));
+  Item *stem = Item::unsmob (me->get_object ("stem"));
+  if (!stem)
+    return ly_interval2scm (s1.extent (Y_AXIS));
+
+  Direction dir = get_grob_direction (me);
+
+  Spanner *beam = Stem::get_beam (stem);
+
+  if (!beam)
+    return ly_interval2scm (s1.extent (Y_AXIS));
+
+  Interval ph = stem->pure_height (stem, 0, INT_MAX);
+  Stem_info si = Stem::get_stem_info (stem);
+  ph[-dir] = si.shortest_y_;
+  int beam_count = Stem::beam_multiplicity (stem).length () + 1;
+  Real beam_translation = get_beam_translation (me);
+
+  ph = ph - dir * max (beam_count, 1) * beam_translation;
+  ph = ph - ph.center ();
+
+  return ly_interval2scm (ph);
+}
+
+MAKE_SCHEME_CALLBACK (Stem_tremolo, width, 1);
+SCM
+Stem_tremolo::width (SCM smob)
+{
+  Grob *me = Grob::unsmob (smob);
+
+  /*
+    Cannot use the real slope, since it looks at the Beam.
+   */
+  Stencil s1 (untranslated_stencil (me, 0.35));
+
+  return ly_interval2scm (s1.extent (X_AXIS));
+}
+
+Real
+Stem_tremolo::vertical_length (Grob *me)
+{
+  return untranslated_stencil (me, 0.35).extent (Y_AXIS).length ();
+}
+
+Stencil
+Stem_tremolo::untranslated_stencil (Grob *me, Real slope)
+{
+  Grob *stem = Grob::unsmob (me->get_object ("stem"));
+  if (!stem)
     {
-      // ugh, rather calc from Stem_tremolo_req
-      int beams_i = Stem::beam_count(stem, RIGHT) >? Stem::beam_count (stem, LEFT);
-      mol.translate (Offset(stem->relative_coordinate (0, X_AXIS) - me->relative_coordinate (0, X_AXIS),
-			    Stem::stem_end_position (stem ) * ss / 2 - 
-			    Directional_element_interface::get (beam) * beams_i * interbeam_f));
+      programming_error ("no stem for stem-tremolo");
+      return Stencil ();
     }
-  else
-    {  
-      /*
-	Beams should intersect one beamthickness below stem end
-      */
-      Real dy = Stem::stem_end_position (stem ) * ss / 2;
-      dy -= mol.extent (Y_AXIS).length () / 2 *  Stem::get_direction (stem );
-
-      /*
-	uhg.  Should use relative coords and placement
-      */
-      Real whole_note_correction;
-      if (Stem::invisible_b (stem ))
-	whole_note_correction = -Stem::get_direction (stem )
-	  * Stem::support_head (stem )->extent (X_AXIS).length () / 2;
-      else
-	whole_note_correction = 0;
-	 
-      mol.translate (Offset (stem->relative_coordinate (0, X_AXIS) - me->relative_coordinate (0, X_AXIS) +
-			     whole_note_correction, dy));
+
+  Direction dir = get_grob_direction (me);
+
+  bool whole_note = Stem::duration_log (stem) <= 0;
+
+  /* for a whole note, we position relative to the notehead, so we want the
+     stencil aligned on the flag closest to the head */
+  Direction stencil_dir = whole_note ? -dir : dir;
+  return raw_stencil (me, slope, stencil_dir);
+}
+
+MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_y_offset, 1);
+SCM
+Stem_tremolo::calc_y_offset (SCM smob)
+{
+  Grob *me = Grob::unsmob (smob);
+  return scm_from_double (y_offset (me, false));
+}
+
+MAKE_SCHEME_CALLBACK (Stem_tremolo, pure_calc_y_offset, 3);
+SCM
+Stem_tremolo::pure_calc_y_offset (SCM smob,
+                                  SCM, /* start */
+                                  SCM /* end */)
+{
+  Grob *me = Grob::unsmob (smob);
+  return scm_from_double (y_offset (me, true));
+}
+
+MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_direction, 1);
+SCM
+Stem_tremolo::calc_direction (SCM smob)
+{
+  Item *me = Item::unsmob (smob);
+
+  Item *stem = Item::unsmob (me->get_object ("stem"));
+  if (!stem)
+    return scm_from_int (CENTER);
+
+  Direction stemdir = get_grob_direction (stem);
+
+  vector<int> nhp = Stem::note_head_positions (stem);
+  /*
+   * We re-decide stem-dir if there may be collisions with other
+   * note heads in the staff.
+   */
+  Grob *maybe_nc = stem->get_parent (X_AXIS)->get_parent (X_AXIS);
+  bool whole_note = Stem::duration_log (stem) <= 0;
+  if (whole_note && Note_collision_interface::has_interface (maybe_nc))
+    {
+      Drul_array<bool> avoid_me (false, false);
+      vector<int> all_nhps = Note_collision_interface::note_head_positions (maybe_nc);
+      if (all_nhps[0] < nhp[0])
+        avoid_me[DOWN] = true;
+      if (all_nhps.back () > nhp.back ())
+        avoid_me[UP] = true;
+      if (avoid_me[stemdir])
+        {
+          stemdir = -stemdir;
+          if (avoid_me[stemdir])
+            {
+              me->warning ("Whole-note tremolo may collide with simultaneous notes.");
+              stemdir = -stemdir;
+            }
+        }
     }
-  
-  return mol.create_scheme();
+  return scm_from_int (stemdir);
 }
 
+Real
+Stem_tremolo::y_offset (Grob *me, bool pure)
+{
+  Item *stem = Item::unsmob (me->get_object ("stem"));
+  if (!stem)
+    return 0.0;
+
+  Direction dir = get_grob_direction (me);
+
+  Spanner *beam = Stem::get_beam (stem);
+  Real beam_translation = get_beam_translation (me);
+
+  int beam_count = beam ? (Stem::beam_multiplicity (stem).length () + 1) : 0;
+
+  if (pure && beam)
+    {
+      Interval ph = stem->pure_height (stem, 0, INT_MAX);
+      Stem_info si = Stem::get_stem_info (stem);
+      ph[-dir] = si.shortest_y_;
+
+      return (ph - dir * max (beam_count, 1) * beam_translation)[dir] - dir * 0.5 * me->pure_height (me, 0, INT_MAX).length ();
+    }
+
+  Real end_y
+    = (pure
+       ? stem->pure_height (stem, 0, INT_MAX)[dir]
+       : stem->extent (stem, Y_AXIS)[dir])
+      - dir * max (beam_count, 1) * beam_translation
+      - Stem::beam_end_corrective (stem);
 
-void
-Stem_tremolo::set_stem (Score_element*me,Score_element *s)
+  if (!beam && Stem::duration_log (stem) >= 3)
+    {
+      end_y -= dir * (Stem::duration_log (stem) - 2) * beam_translation;
+      if (dir == UP)
+        end_y -= dir * beam_translation * 0.5;
+    }
+
+  bool whole_note = Stem::duration_log (stem) <= 0;
+  if (whole_note || isinf(end_y))
+    {
+      /* we shouldn't position relative to the end of the stem since the stem
+         is invisible */
+      Real ss = Staff_symbol_referencer::staff_space (me);
+      vector<int> nhp = Stem::note_head_positions (stem);
+      Real note_head = (dir == UP ? nhp.back () : nhp[0]) * ss / 2;
+      end_y = note_head + dir * 1.5;
+    }
+
+  return end_y;
+}
+
+MAKE_SCHEME_CALLBACK (Stem_tremolo, print, 1);
+SCM
+Stem_tremolo::print (SCM grob)
 {
-  me->set_elt_property ("stem", s->self_scm ());
+  Grob *me = Grob::unsmob (grob);
+
+  Stencil s = untranslated_stencil (me, robust_scm2double (me->get_property ("slope"), 0.25));
+  return s.smobbed_copy ();
 }
 
+ADD_INTERFACE (Stem_tremolo,
+               "A beam slashing a stem to indicate a tremolo.  The property"
+               " @code{style} can be @code{default} or @code{rectangle}.",
+
+               /* properties */
+               "beam-thickness "
+               "beam-width "
+               "direction "
+               "flag-count "
+               "length-fraction "
+               "stem "
+               "style "
+               "slope "
+              );