along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
+/*
+ Note that several internal functions have a calc_beam bool argument.
+ This argument means: "If set, acknowledge the fact that there is a beam
+ and deal with it. If not, give me the measurements as if there is no beam."
+ Most pure functions are called WITHOUT calc_beam, whereas non-pure functions
+ are called WITH calc_beam.
+
+ The only exception to this is ::pure_height, which calls internal_pure_height
+ with "true" for calc_beam in order to trigger the calculations of other
+ pure heights in case there is a beam. It passes false, however, to
+ internal_height and internal_pure_height for all subsequent iterations.
+*/
+
#include "stem.hh"
#include "spanner.hh"
}
void
-Stem::set_stemend (Grob *me, Real se)
+Stem::set_stem_positions (Grob *me, Real se)
{
// todo: margins
Direction d = get_grob_direction (me);
+ Grob *beam = unsmob_grob (me->get_object ("beam"));
if (d && d * head_positions (me)[get_grob_direction (me)] >= se * d)
me->warning (_ ("weird stem size, check for narrow beams"));
- me->set_property ("stem-end-position", scm_from_double (se));
+ Interval height = me->pure_height (me, 0, INT_MAX);
+ Real half_space = Staff_symbol_referencer::staff_space (me) * 0.5;
+
+ height[d] = se * half_space + beam_end_corrective (me);
+
+ Real stemlet_length = robust_scm2double (me->get_property ("stemlet-length"),
+ 0.0);
+ bool stemlet = stemlet_length > 0.0;
+
+ Grob *lh = get_reference_head (me);
+
+ if (!lh)
+ {
+ if (stemlet && beam)
+ {
+ Real beam_translation = Beam::get_beam_translation (beam);
+ Real beam_thickness = Beam::get_beam_thickness (beam);
+ int beam_count = beam_multiplicity (me).length () + 1;
+
+ height[-d] = (height[d] - d
+ * (0.5 * beam_thickness
+ + beam_translation * max (0, (beam_count - 1))
+ + stemlet_length));
+ }
+ else if (!stemlet && beam)
+ height[-d] = height[d];
+ else if (stemlet && !beam)
+ me->programming_error ("Can't have a stemlet without a beam.");
+ }
+
+ me->set_property ("Y-extent", ly_interval2scm (height));
}
/* Note head that determines hshift for upstems
SCM /* end */)
{
Grob *me = unsmob_grob (smob);
- Interval iv;
+ return ly_interval2scm (internal_pure_height (me, true));
+}
+Interval
+Stem::internal_pure_height (Grob *me, bool calc_beam)
+{
if (!is_normal_stem (me))
- return ly_interval2scm (iv);
+ return Interval (0.0, 0.0);
- Real ss = Staff_symbol_referencer::staff_space (me);
- Real rad = Staff_symbol_referencer::staff_radius (me);
+ Grob *beam = unsmob_grob (me->get_object ("beam"));
+
+ Interval iv = internal_height (me, false);
- if (!to_boolean (me->get_property ("cross-staff")))
+ if (!beam)
+ return iv;
+ if (!to_boolean (me->get_property ("cross-staff")) && calc_beam)
{
- Real len_in_halfspaces;
- SCM user_set_len_scm = me->get_property_data ("length");
- if (scm_is_number (user_set_len_scm))
- len_in_halfspaces = scm_to_double (user_set_len_scm);
- else
- len_in_halfspaces = scm_to_double (calc_length (smob));
- Real len = len_in_halfspaces * ss / 2;
+ Interval overshoot;
Direction dir = get_grob_direction (me);
+ Direction d = DOWN;
+ do
+ overshoot[d] = d == dir ? dir * infinity_f : iv[d];
+ while (flip (&d) != DOWN);
- Interval hp = head_positions (me);
- if (dir == UP)
- iv = Interval (0, len);
- else
- iv = Interval (-len, 0);
+ vector<Interval> heights;
+ vector<Grob *> my_stems;
+ extract_grob_set (beam, "normal-stems", normal_stems);
+ for (vsize i = 0; i < normal_stems.size (); i++)
+ if (normal_stems[i] != me && get_grob_direction (normal_stems[i]) == dir)
+ {
+ heights.push_back (Stem::internal_pure_height (normal_stems[i], false));
+ my_stems.push_back (normal_stems[i]);
+ iv.unite (heights.back ());
+ }
+ for (vsize i = 0; i < my_stems.size (); i++)
+ cache_pure_height (my_stems[i], iv, heights[i]);
+ iv.intersect (overshoot);
+ }
- if (!hp.is_empty ())
- {
- iv.translate (hp[dir] * ss / 2);
- iv.add_point (hp[-dir] * ss / 2);
- }
+ return iv;
+}
- /* extend the stem (away from the head) to cover the staff */
- if (dir == UP)
- iv[UP] = max (iv[UP], rad * ss);
- else
- iv[DOWN] = min (iv[DOWN], -rad * ss);
- }
- else
- iv = Interval (-rad * ss, rad * ss);
+void
+Stem::cache_pure_height (Grob *me, Interval iv, Interval my_iv)
+{
+ Interval overshoot;
+ Direction dir = get_grob_direction (me);
+ Direction d = DOWN;
+ do
+ overshoot[d] = d == dir ? dir * infinity_f : my_iv[d];
+ while (flip (&d) != DOWN);
- return ly_interval2scm (iv);
+ iv.intersect (overshoot);
+ dynamic_cast<Item *> (me)->cache_pure_height (iv);
}
MAKE_SCHEME_CALLBACK (Stem, calc_stem_end_position, 1)
Stem::calc_stem_end_position (SCM smob)
{
Grob *me = unsmob_grob (smob);
+ return scm_from_double (internal_calc_stem_end_position (me, true));
+}
+
+MAKE_SCHEME_CALLBACK (Stem, pure_calc_stem_end_position, 3)
+SCM
+Stem::pure_calc_stem_end_position (SCM smob,
+ SCM, /* start */
+ SCM /* end */)
+{
+ Grob *me = unsmob_grob (smob);
+ return scm_from_double (internal_calc_stem_end_position (me, false));
+}
+Real
+Stem::internal_calc_stem_end_position (Grob *me, bool calc_beam)
+{
if (!head_count (me))
- return scm_from_double (0.0);
+ return 0.0;
- if (Grob *beam = get_beam (me))
+ Grob *beam = get_beam (me);
+ Real ss = Staff_symbol_referencer::staff_space (me);
+ if (beam && calc_beam)
{
(void) beam->get_property ("quantized-positions");
- return me->get_property ("stem-end-position");
+ return me->extent (me, Y_AXIS)[get_grob_direction (me)] * ss * 2;
}
vector<Real> a;
/* WARNING: IN HALF SPACES */
- Real length = robust_scm2double (me->get_property ("length"), 7);
-
- Direction dir = get_grob_direction (me);
- Interval hp = head_positions (me);
- Real stem_end = dir ? hp[dir] + dir * length : 0;
-
- /* TODO: change name to extend-stems to staff/center/'() */
- bool no_extend = to_boolean (me->get_property ("no-stem-extend"));
- if (!no_extend && dir * stem_end < 0)
- stem_end = 0.0;
-
- return scm_from_double (stem_end);
-}
-
-/* Length is in half-spaces (or: positions) here. */
-MAKE_SCHEME_CALLBACK (Stem, calc_length, 1)
-SCM
-Stem::calc_length (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
-
SCM details = me->get_property ("details");
int durlog = duration_log (me);
- Real ss = Staff_symbol_referencer::staff_space (me);
Real staff_rad = Staff_symbol_referencer::staff_radius (me);
Real length = 7;
SCM s = ly_assoc_get (ly_symbol2scm ("lengths"), details, SCM_EOL);
/* Tremolo stuff. */
Grob *t_flag = unsmob_grob (me->get_object ("tremolo-flag"));
- if (t_flag && !unsmob_grob (me->get_object ("beam")))
+ if (t_flag && (!unsmob_grob (me->get_object ("beam")) || !calc_beam))
{
/* Crude hack: add extra space if tremolo flag is there.
length = max (length, minlen + 1.0);
}
- return scm_from_double (length);
+ Real stem_end = dir ? hp[dir] + dir * length : 0;
+
+ /* TODO: change name to extend-stems to staff/center/'() */
+ bool no_extend = to_boolean (me->get_property ("no-stem-extend"));
+ if (!no_extend && dir * stem_end < 0)
+ stem_end = 0.0;
+
+ return stem_end;
}
+
/* The log of the duration (Number of hooks on the flag minus two) */
int
Stem::duration_log (Grob *me)
return scm_from_int (dir);
}
+// note - height property necessary to trigger quantized beam positions
+// otherwise, we could just use Grob::stencil_height_proc
MAKE_SCHEME_CALLBACK (Stem, height, 1);
SCM
Stem::height (SCM smob)
{
Grob *me = unsmob_grob (smob);
- if (!is_normal_stem (me))
- return ly_interval2scm (Interval ());
-
- Direction dir = get_grob_direction (me);
+ return ly_interval2scm (internal_height (me, true));
+}
- Grob *beam = get_beam (me);
- if (beam)
- {
- /* trigger set-stem-lengths. */
- beam->get_property ("quantized-positions");
- }
+Grob*
+Stem::get_reference_head (Grob *me)
+{
+ return to_boolean (me->get_property ("avoid-note-head"))
+ ? last_head (me)
+ : first_head (me);
+}
- /*
- Can't get_stencil (), since that would cache stencils too early.
- This causes problems with beams.
- */
- Stencil *stencil = unsmob_stencil (print (smob));
- Interval iv = stencil ? stencil->extent (Y_AXIS) : Interval ();
+Real
+Stem::beam_end_corrective (Grob *me)
+{
+ Grob *beam = unsmob_grob (me->get_object ("beam"));
+ Direction dir = get_grob_direction (me);
if (beam)
{
if (dir == CENTER)
programming_error ("no stem direction");
dir = UP;
}
- iv[dir] += dir * Beam::get_beam_thickness (beam) * 0.5;
+ return dir * Beam::get_beam_thickness (beam) * 0.5;
}
-
- return ly_interval2scm (iv);
+ return 0.0;
}
-Real
-Stem::stem_end_position (Grob *me)
+Interval
+Stem::internal_height (Grob *me, bool calc_beam)
{
- return robust_scm2double (me->get_property ("stem-end-position"), 0);
+ if (!is_valid_stem (me))
+ return Interval ();
+
+ Direction dir = get_grob_direction (me);
+
+ Grob *beam = get_beam (me);
+ if (beam && calc_beam)
+ {
+ /* trigger set-stem-lengths. */
+ (void) beam->get_property ("quantized-positions");
+ return me->extent (me, Y_AXIS);
+ }
+
+ Real y2 = internal_calc_stem_end_position (me, calc_beam);
+ Real y1 = internal_calc_stem_begin_position (me, calc_beam);
+
+ Real half_space = Staff_symbol_referencer::staff_space (me) * 0.5;
+
+ Interval stem_y = Interval (min (y1, y2), max (y2, y1)) * half_space;
+ stem_y[dir] += beam_end_corrective (me);
+
+ return stem_y;
}
MAKE_SCHEME_CALLBACK (Stem, width, 1);
Stem::calc_stem_begin_position (SCM smob)
{
Grob *me = unsmob_grob (smob);
+ return scm_from_double (internal_calc_stem_begin_position (me, true));
+}
+
+MAKE_SCHEME_CALLBACK (Stem, pure_calc_stem_begin_position, 3);
+SCM
+Stem::pure_calc_stem_begin_position (SCM smob,
+ SCM, /* start */
+ SCM /* end */)
+{
+ Grob *me = unsmob_grob (smob);
+ return scm_from_double (internal_calc_stem_begin_position (me, false));
+}
+
+Real
+Stem::internal_calc_stem_begin_position (Grob *me, bool calc_beam)
+{
+ Grob *beam = get_beam (me);
+ Real ss = Staff_symbol_referencer::staff_space (me);
+ if (beam && calc_beam)
+ {
+ (void) beam->get_property ("quantized-positions");
+ return me->extent (me, Y_AXIS)[-get_grob_direction (me)] * ss * 2;
+ }
+
Direction d = get_grob_direction (me);
- Real half_space = Staff_symbol_referencer::staff_space (me) * 0.5;
- Grob *lh
- = to_boolean (me->get_property ("avoid-note-head"))
- ? last_head (me)
- : first_head (me);
+ Grob *lh = get_reference_head (me);
Real pos = Staff_symbol_referencer::get_position (lh);
Real y_attach = Note_head::stem_attachment_coordinate (head, Y_AXIS);
y_attach = head_height.linear_combination (y_attach);
- pos += d * y_attach / half_space;
+ pos += d * y_attach * 2 / ss;
}
- return scm_from_double (pos);
+ return pos;
}
-MAKE_SCHEME_CALLBACK (Stem, print, 1);
-SCM
-Stem::print (SCM smob)
+bool
+Stem::is_valid_stem (Grob *me)
{
- Grob *me = unsmob_grob (smob);
- Grob *beam = get_beam (me);
-
- Stencil mol;
- Direction d = get_grob_direction (me);
-
+ /* TODO: make the stem start a direction ?
+ This is required to avoid stems passing in tablature chords. */
Real stemlet_length = robust_scm2double (me->get_property ("stemlet-length"),
0.0);
bool stemlet = stemlet_length > 0.0;
- /* TODO: make the stem start a direction ?
- This is required to avoid stems passing in tablature chords. */
- Grob *lh
- = to_boolean (me->get_property ("avoid-note-head"))
- ? last_head (me)
- : first_head (me);
+ Grob *lh = get_reference_head (me);
+ Grob *beam = unsmob_grob (me->get_object ("beam"));
if (!lh && !stemlet)
- return SCM_EOL;
+ return false;
if (!lh && stemlet && !beam)
- return SCM_EOL;
+ return false;
if (lh && robust_scm2int (lh->get_property ("duration-log"), 0) < 1)
- return SCM_EOL;
+ return false;
if (is_invisible (me))
- return SCM_EOL;
+ return false;
- Real y2 = robust_scm2double (me->get_property ("stem-end-position"), 0.0);
- Real y1 = y2;
- Real half_space = Staff_symbol_referencer::staff_space (me) * 0.5;
+ return true;
+}
- if (lh)
- y2 = robust_scm2double (me->get_property ("stem-begin-position"), 0.0);
- else if (stemlet)
- {
- Real beam_translation = Beam::get_beam_translation (beam);
- Real beam_thickness = Beam::get_beam_thickness (beam);
- int beam_count = beam_multiplicity (me).length () + 1;
-
- y2 -= d
- * (0.5 * beam_thickness
- + beam_translation * max (0, (beam_count - 1))
- + stemlet_length) / half_space;
- }
+MAKE_SCHEME_CALLBACK (Stem, print, 1);
+SCM
+Stem::print (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+ if (!is_valid_stem (me))
+ return SCM_EOL;
+
+ Interval stem_y = me->extent (me, Y_AXIS);
+ Direction dir = get_grob_direction (me);
- Interval stem_y (min (y1, y2), max (y2, y1));
+ stem_y[dir] -= beam_end_corrective (me);
// URG
Real stem_width = thickness (me);
= me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"));
Box b = Box (Interval (-stem_width / 2, stem_width / 2),
- Interval (stem_y[DOWN] * half_space, stem_y[UP] * half_space));
+ stem_y);
+ Stencil mol;
Stencil ss = Lookup::round_filled_box (b, blot);
mol.add_stencil (ss);
"duration-log "
"flag "
"french-beaming "
- "length "
"length-fraction "
"max-beam-connect "
"neutral-direction "
"note-heads "
"positioning-done "
"rests "
- "stem-begin-position "
- "stem-end-position "
"stem-info "
"stemlet-length "
"thickness "
projects / lilypond.git / commitdiff