+/*
+ beam-concave.cc -- implement Concaveness for beams.
+
+ source file of the GNU LilyPond music typesetter
+
+ (c) 2004 Han-Wen Nienhuys <hanwen@lilypond.org>
+
+*/
+
/*
Determine whether a beam is concave.
+
+ A beam is concave when the middle notes get closer to the
+ beam than the left and right edge notes.
+
+ This is determined in two ways: by looking at the positions of the
+ middle notes, or by looking at the deviation of the inside notes
+ compared to the line connecting first and last.
+
+ The tricky thing is what to do with beams with chords. There are no
+ real guidelines in this case.
*/
#include "pointer-group-interface.hh"
-#include "std-vector.hh"
#include "stem.hh"
#include "beam.hh"
+#include "grob.hh"
#include "staff-symbol-referencer.hh"
#include "directional-element-interface.hh"
/*
notes above and below the interval covered by 1st and last note.
*/
- for (vsize i = 1; i < positions.size () - 1; i++)
+ for (vsize i = 1; i + 1 < positions.size (); i++)
{
above = above || (positions[i] > covering[UP]);
below = below || (positions[i] < covering[DOWN]);
*/
int dy = positions.back () - positions[0];
int closest = max (beam_dir * positions.back (), beam_dir * positions[0]);
- for (vsize i = 2; !concave && i < positions.size () - 1; i++)
+ for (vsize i = 2; !concave && i + 1 < positions.size (); i++)
{
int inner_dy = positions[i] - positions[i - 1];
if (sign (inner_dy) != sign (dy)
}
bool all_closer = true;
- for (vsize i = 1; all_closer && i < positions.size () - 1; i++)
+ for (vsize i = 1; all_closer && i + 1 < positions.size (); i++)
{
all_closer = all_closer
&& (beam_dir * positions[i] > closest);
Real dy = positions.back () - positions[0];
Real slope = dy / Real (positions.size () - 1);
Real concaveness = 0.0;
- for (vsize i = 1; i < positions.size () - 1; i++)
+ for (vsize i = 1; i + 1 < positions.size (); i++)
{
Real line_y = slope * i + positions[0];
Direction beam_dir = CENTER;
for (vsize i = stems.size (); i--;)
{
- if (Stem::is_invisible (stems[i]))
- stems.erase (stems.begin () + i);
- else
+ if (Stem::is_normal_stem (stems[i]))
{
if (Direction dir = get_grob_direction (stems[i]))
beam_dir = dir;
}
+ else
+ stems.erase (stems.begin () + i);
}
if (stems.size () <= 2)
- return SCM_UNSPECIFIED;
+ return scm_from_int (0);
vector<int> close_positions;
vector<int> far_positions;
Hmmm.. wait, for the beams in the last measure of morgenlied,
this doesn't look so good. Let's try the heads farthest from
the beam.
-
*/
Interval posns = Stem::head_positions (stems[i]);
Real concaveness = 0.0;
- if (is_concave_single_notes (far_positions, beam_dir))
+ if (is_concave_single_notes (beam_dir == UP ? close_positions : far_positions, beam_dir))
{
concaveness = 10000;
}