source file of the GNU LilyPond music typesetter
- (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 2000--2001 Jan Nieuwenhuizen <janneke@gnu.org>
*/
#include "molecule.hh"
#include "paper-column.hh"
#include "staff-symbol-referencer.hh"
+#include <math.h>
+
SCM
Line_spanner::line_atom (Grob* me, Real dx, Real dy)
{
return list;
}
+Offset
+Line_spanner::get_broken_offset (Grob *me, Direction dir)
+{
+ Spanner *spanner = dynamic_cast<Spanner*> (me);
+ Item* bound = spanner->get_bound (dir);
+
+ if (!bound->break_status_dir ())
+ {
+ Grob *common[] = {
+ bound->common_refpoint (Staff_symbol_referencer::staff_symbol_l (me),
+ X_AXIS),
+ bound->common_refpoint (Staff_symbol_referencer::staff_symbol_l (me),
+ Y_AXIS)
+ };
+
+ return Offset (abs (bound->extent (common[X_AXIS], X_AXIS)[-dir]),
+ bound->extent (common[Y_AXIS], Y_AXIS).center ());
+ }
+ return Offset ();
+}
+
+Offset
+Line_spanner::broken_trend_offset (Grob *me, Direction dir)
+{
+ /* A broken line-spaner should maintain the same vertical trend
+ the unbroken line-spanner would have had.
+ From slur */
+ Offset o;
+ if (Spanner *mother = dynamic_cast<Spanner*> (me->original_l_))
+ {
+ for (int i = dir == LEFT ? 0 : mother->broken_into_l_arr_.size () - 1;
+ dir == LEFT ? i < mother->broken_into_l_arr_.size () : i > 0;
+ dir == LEFT ? i++ : i--)
+ {
+ if (mother->broken_into_l_arr_[i - dir] == me)
+ {
+ Grob *neighbour = mother->broken_into_l_arr_[i];
+ Offset neighbour_o = get_broken_offset (neighbour, dir);
+ Offset me_o = get_broken_offset (me, -dir);
+ // Hmm, why not return me_o[X], but recalc in brew_mol?
+ o = Offset (0,
+ (neighbour_o[Y_AXIS]*me_o[X_AXIS]
+ - me_o[Y_AXIS]*neighbour_o[X_AXIS]) * dir /
+ (me_o[X_AXIS] + neighbour_o[X_AXIS]));
+ break;
+ }
+ }
+ }
+ return o;
+}
+
+
+/*
+ Warning: this thing is a cross-staff object, so it should have empty Y-dimensions.
+
+ (If not, you risk that this is called from the staff-alignment
+ routine, via molecule_extent. At this point, the staffs aren't
+ separated yet, so it doesn't work cross-staff.
+
+*/
MAKE_SCHEME_CALLBACK (Line_spanner, brew_molecule, 1);
SCM
Line_spanner::brew_molecule (SCM smob)
{
Grob *me= unsmob_grob (smob);
+
Spanner *spanner = dynamic_cast<Spanner*> (me);
+ Item* bound_drul[] = {
+ spanner->get_bound (LEFT),
+ 0,
+ spanner->get_bound (RIGHT)
+ };
+
+ Item** bound = bound_drul + 1;
Grob *common[] = { 0, 0 };
- common[X_AXIS] = spanner->get_bound (LEFT)->common_refpoint (spanner->get_bound (RIGHT), X_AXIS);
- common[Y_AXIS] = spanner->get_bound (LEFT)->common_refpoint (spanner->get_bound (RIGHT), Y_AXIS);
-
- if (!common[X_AXIS] || !common[Y_AXIS])
- return SCM_EOL;
-
- Real dx =
- spanner->get_bound (LEFT)->relative_coordinate (common[X_AXIS], X_AXIS)
- - spanner->get_bound (RIGHT)->relative_coordinate (common[X_AXIS], X_AXIS)
- + spanner->get_bound (RIGHT)->extent (spanner->get_bound (RIGHT),
- X_AXIS)[LEFT]
- - spanner->get_bound (LEFT)->extent (spanner->get_bound (LEFT),
- X_AXIS)[RIGHT];
-
- Real dy =
- spanner->get_bound (LEFT)->relative_coordinate (common[Y_AXIS], Y_AXIS)
- - spanner->get_bound (RIGHT)->relative_coordinate (common[Y_AXIS], Y_AXIS)
- + spanner->get_bound (RIGHT)->extent (spanner->get_bound (RIGHT),
- Y_AXIS).center ()
- - spanner->get_bound (LEFT)->extent (spanner->get_bound (LEFT),
- Y_AXIS).center ();
+ for (Axis a = X_AXIS; a < NO_AXES; a = Axis (a + 1))
+ {
+ common[a] = bound[LEFT]->common_refpoint (bound[RIGHT], a);
+
+ if (!common[a])
+ return SCM_EOL;
+ }
- Molecule line;
Real gap = gh_scm2double (me->get_grob_property ("gap"));
- Offset o (dx, dy);
- o *= (o.length () - 2 * gap) / o.length ();
+ Real dist; /*distance between points */
+
+ Offset ofxy (gap, 0); /*offset from start point to start of line*/
+ Offset dxy ;
+ Offset my_off;
+ Offset his_off;
+
- SCM list = Line_spanner::line_atom (me, o[X_AXIS], o[Y_AXIS]);
+ if (bound[LEFT]->break_status_dir () || bound[RIGHT]->break_status_dir ())
+ /* across line break */
+ {
+ Direction broken = bound[LEFT]->break_status_dir () ? LEFT : RIGHT;
+
+ dxy[X_AXIS] = bound[RIGHT]->extent (common[X_AXIS], X_AXIS)[LEFT]
+ - bound[LEFT]->extent (common[X_AXIS], X_AXIS)[RIGHT];
+
+ dxy += broken_trend_offset (me, broken);
+ dxy[X_AXIS] -= 1 * gap;
+
+ my_off = Offset (0,
+ me->relative_coordinate (common[Y_AXIS], Y_AXIS));
+
+ his_off = Offset (0,
+ bound[-broken]->relative_coordinate (common[Y_AXIS],
+ Y_AXIS));
+
+ if (broken == LEFT)
+ {
+ my_off[Y_AXIS] += dxy[Y_AXIS];
+ }
+ }
+ else
+ {
+ Real off = gap + ((bound[LEFT]->extent (bound[LEFT], X_AXIS).length ()*3)/4); // distance from center to start of line
+ dxy[X_AXIS] = bound[RIGHT]->extent (common[X_AXIS], X_AXIS).center ()
+ - bound[LEFT]->extent (common[X_AXIS], X_AXIS).center ();
+ dxy[Y_AXIS] = bound[RIGHT]->extent (common[Y_AXIS], Y_AXIS).center ()
+ - bound[LEFT]->extent (common[Y_AXIS], Y_AXIS).center ();
+
+ dist = sqrt (dxy[X_AXIS]*dxy[X_AXIS]+dxy[Y_AXIS]*dxy[Y_AXIS]);
+ ofxy = dxy* (off/dist);
+ dxy -= 2*ofxy;
+
+ my_off = Offset (me->relative_coordinate (common[X_AXIS], X_AXIS),
+ me->relative_coordinate (common[Y_AXIS], Y_AXIS));
+
+ his_off = Offset (bound[LEFT]->relative_coordinate (common[X_AXIS],
+ X_AXIS),
+ bound[LEFT]->relative_coordinate (common[Y_AXIS],
+ Y_AXIS));
+
+ }
+ Molecule line;
+ SCM list = Line_spanner::line_atom (me, dxy[X_AXIS], dxy[Y_AXIS]);
if (list == SCM_EOL)
return SCM_EOL;
- Box b (Interval (0, o[X_AXIS]), Interval (0, o[Y_AXIS]));
+ Box b (Interval (0, dxy[X_AXIS]), Interval (0, dxy[Y_AXIS]));
line = Molecule (b, list);
- line.translate_axis (spanner->get_bound (LEFT)->extent (spanner->get_bound (LEFT), X_AXIS).length (), X_AXIS);
- Offset g = o * (gap / o.length ());
- line.translate (g);
+ line.translate_axis (bound[LEFT]->extent (bound[LEFT], X_AXIS).length ()/2, X_AXIS);
+
+ //Offset g (gap, 0);
+ line.translate (ofxy - my_off + his_off);
return line.smobbed_copy ();
}
projects / lilypond.git / blobdiff