/*
-staff-spacing.cc -- implement Staff_spacing
+ staff-spacing.cc -- implement Staff_spacing
-source file of the GNU LilyPond music typesetter
+ source file of the GNU LilyPond music typesetter
-(c) 2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 2001--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
- */
+*/
#include "staff-spacing.hh"
-#include "grob.hh"
-bool
-Staff_spacing::has_interface (Grob* g)
+#include <cstdio>
+
+#include "paper-column.hh"
+#include "separation-item.hh"
+#include "warn.hh"
+#include "bar-line.hh"
+#include "staff-symbol-referencer.hh"
+#include "note-column.hh"
+#include "stem.hh"
+#include "accidental-placement.hh"
+
+/*
+ Insert some more space for the next note, in case it has a stem in
+ the wrong direction
+
+ */
+Real
+Staff_spacing::next_note_correction (Grob * me,
+ Grob * g,
+ Interval bar_size)
{
- return g && g->has_interface (ly_symbol2scm ("staff-spacing-interface"));
+ if (!g || !Note_column::has_interface (g))
+ return 0.0;
+
+ Item *col = dynamic_cast<Item*> (g)->get_column ();
+ Real max_corr = 0. >? (- g->extent (col, X_AXIS)[LEFT]);
+
+ /*
+ Duh. If this gets out of hand, we should invent something more generic.
+ */
+ if (Grob * a = Note_column::accidentals (g))
+ {
+ Interval v;
+ if (Accidental_placement::has_interface (a))
+ {
+ v = Accidental_placement::get_relevant_accidental_extent (a, col, me);
+ }
+ else
+ v = a->extent (col, X_AXIS);
+
+ max_corr = max_corr >? (- v[LEFT]);
+ }
+ if (Grob* a = unsmob_grob (g->get_property ("arpeggio")))
+ {
+ max_corr = max_corr >? (- a->extent (col, X_AXIS)[LEFT]);
+ }
+
+ /*
+ Let's decrease the space a little if the problem is not located
+ after a barline.
+ */
+ if (bar_size.is_empty ())
+ max_corr *= 0.75;
+
+ if (!bar_size.is_empty ())
+ if (Grob *stem = Note_column::get_stem (g))
+ {
+ Direction d = Stem::get_direction (stem);
+ if (d == DOWN)
+ {
+ Real stem_start = Stem::head_positions (stem) [DOWN];
+ Real stem_end = Stem::stem_end_position (stem);
+ Interval stem_posns (stem_start <? stem_end,
+ stem_end >? stem_start);
+
+ stem_posns.intersect (bar_size);
+
+ Real corr = abs (stem_posns.length ()/7.) <? 1.0;
+ corr *=
+ robust_scm2double (me->get_property ("stem-spacing-correction"), 1);
+
+ if (d != DOWN)
+ corr = 0.0;
+ max_corr = max_corr >? corr;
+ }
+ }
+ return max_corr;
}
/*
+ Y-positions that are covered by BAR_GROB, in the case that it is a
+ barline. */
+Interval
+Staff_spacing::bar_y_positions (Grob *bar_grob)
+{
+ Interval bar_size;
+ bar_size.set_empty ();
+ if (Bar_line::has_interface (bar_grob))
+ {
+ SCM glyph = bar_grob->get_property ("glyph");
+
+ String glyph_string = scm_is_string (glyph) ? ly_scm2string (glyph) : "";
+ if (glyph_string.left_string (1) == "|" || glyph_string.left_string (1) == ".")
+ {
+ SCM sz = Bar_line::get_staff_bar_size (bar_grob->self_scm ());
+ bar_size = Interval (-1, 1);
+ bar_size *= robust_scm2double (sz, 1)
+ / Staff_symbol_referencer::staff_space (bar_grob);
+ }
+ }
+ return bar_size;
+}
+
+/*
+ Do corrections for the following notes.
+
+ This is slightly convoluted, since the staffspacing grob gets
+ pointers to the separation-items, not the note-columns or
+ note-spacings.
+
+ */
+Real
+Staff_spacing::next_notes_correction (Grob *me, Grob * last_grob)
+{
+ Interval bar_size = bar_y_positions (last_grob);
+ Real max_corr = 0.0;
+
+ for (SCM s = me->get_property ("right-items");
+ scm_is_pair (s); s = scm_cdr (s))
+ {
+ Grob * g = unsmob_grob (scm_car (s));
+
+ max_corr = max_corr >? next_note_correction (me, g, bar_size);
+ for (SCM t = g->get_property ("elements");
+ scm_is_pair (t); t = scm_cdr (t))
+ max_corr = max_corr >? next_note_correction (me, unsmob_grob (scm_car (t)), bar_size);
+
+ }
- TODO: move computation of clef/key-sig/whatever to first-note
- distance here.
+ return max_corr;
+}
-*/
+void
+Staff_spacing::get_spacing_params (Grob *me, Real * space, Real * fixed)
+{
+ *space = 1.0;
+ *fixed = 1.0;
+
+ Grob * separation_item = 0;
+ Item * me_item = dynamic_cast<Item*> (me);
+
+ for (SCM s = me->get_property ("left-items");
+ scm_is_pair (s); s = scm_cdr (s))
+ {
+ Grob * cand = unsmob_grob (scm_car (s));
+ if (cand && Separation_item::has_interface (cand))
+ separation_item = cand ;
+ }
+
+ // printf ("doing col %d\n" , Paper_column::get_rank (left_col));
+
+ if (!separation_item)
+ {
+ programming_error ("no sep item");
+ return;
+ }
+
+ Interval last_ext;
+ Grob *last_grob = Separation_item::extremal_break_aligned_grob (separation_item, RIGHT,
+ &last_ext);
+ if (!last_grob)
+ {
+ /*
+ TODO:
+
+ Should insert a adjustable space here? For excercises, you might want to
+ use a staff without a clef in the beginning.
+ */
+
+ /*
+ we used to have a warning here, but itgenerates a lot of
+ spurious error messages.
+ */
+ return ;
+ }
+
+ *fixed = last_ext[RIGHT];
+ *space = *fixed + 1.0;
+
+ SCM alist = last_grob->get_property ("space-alist");
+ if (!scm_list_p (alist))
+ return ;
+
+ SCM space_def = scm_sloppy_assq (ly_symbol2scm ("first-note"), alist);
+ if (me_item->break_status_dir () == CENTER)
+ {
+ SCM nndef = scm_sloppy_assq (ly_symbol2scm ("next-note"), alist);
+ if (scm_is_pair (nndef))
+ space_def = nndef;
+ }
+
+
+ if (!scm_is_pair (space_def))
+ {
+ programming_error ("Unknown prefatory spacing. ");
+ return;
+ }
+
+ space_def = scm_cdr (space_def);
+ Real distance = scm_to_double (scm_cdr (space_def));
+ SCM type = scm_car (space_def) ;
+
+ *fixed = last_ext[RIGHT];
+ if (type == ly_symbol2scm ("fixed-space"))
+ {
+ *fixed += distance;
+ *space = *fixed;
+ }
+ else if (type == ly_symbol2scm ("extra-space"))
+ {
+ *space = *fixed + distance;
+ }
+ else if (type == ly_symbol2scm ("semi-fixed-space"))
+ {
+ *fixed += distance / 2;
+ *space = *fixed + distance/2;
+ }
+ else if (type == ly_symbol2scm ("minimum-space"))
+ {
+ *space = last_ext[LEFT] + (last_ext.length () >? distance);
+ }
+ else if (type == ly_symbol2scm ("minimum-fixed-space"))
+ {
+ *space = last_ext[LEFT] + (last_ext.length () >? distance);
+ *fixed = *space;
+ }
+
+ *space += next_notes_correction (me, last_grob);
+}
+
+
+ADD_INTERFACE (Staff_spacing, "staff-spacing-interface",
+ "This object calculates spacing details from a "
+ " breakable symbol (left) to another object. For example, it takes care "
+ " of optical spacing from a bar lines to a note.",
+ "stem-spacing-correction left-items right-items");
projects / lilypond.git / blobdiff