2 paper-column-engraver.cc -- implement Paper_column_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
10 #include "paper-column-engraver.hh"
13 #include "paper-column.hh"
14 #include "staff-spacing.hh"
15 #include "note-spacing.hh"
16 #include "pointer-group-interface.hh"
18 #include "axis-group-interface.hh"
23 Paper_column_engraver::Paper_column_engraver ()
34 Paper_column_engraver::finalize ()
37 progress_indication ("[" + to_string (breaks_) + "]");
41 command_column_->set_property ("breakable", SCM_BOOL_T);
42 system_->set_bound (RIGHT, command_column_);
47 Paper_column_engraver::make_columns ()
52 Paper_column *p1 = make_paper_column ("NonMusicalPaperColumn");
53 Paper_column *p2 = make_paper_column ("PaperColumn");
55 SCM m = now_mom().smobbed_copy();
56 p1->set_property ("when", m);
57 p2->set_property ("when", m);
64 Paper_column_engraver::initialize ()
66 system_ = dynamic_cast<System*> (unsmob_grob (get_property ("rootSystem")));
70 system_->set_bound (LEFT, command_column_);
71 command_column_->set_property ("breakable", SCM_BOOL_T);
75 Paper_column_engraver::acknowledge_grob (Grob_info gi)
77 Item *item = dynamic_cast<Item *> (gi.grob ());
80 programming_error ("Spanner found in Paper_column_engraver::acknowledge_grob()");
86 if (Staff_spacing::has_interface (item))
88 Pointer_group_interface::add_grob (command_column_,
89 ly_symbol2scm ("spacing-wishes"),
92 if (Note_spacing::has_interface (item))
94 Pointer_group_interface::add_grob (musical_column_,
95 ly_symbol2scm ("spacing-wishes"),
101 Paper_column_engraver::set_columns (Paper_column *new_command,
102 Paper_column *new_musical)
104 command_column_ = new_command;
105 musical_column_ = new_musical;
108 context ()->set_property ("currentCommandColumn", new_command->self_scm ());
113 context ()->set_property ("currentMusicalColumn", new_musical->self_scm ());
116 system_->add_column (command_column_);
117 system_->add_column (musical_column_);
122 Paper_column_engraver::forbid_breaks ()
124 if (command_column_ && !first_)
125 command_column_->set_property ("breakable", SCM_EOL);
130 Paper_column_engraver::try_music (Music *m)
138 Paper_column_engraver::process_music ()
142 SCM pen = command_column_->get_property ("penalty");
143 Real total_penalty = scm_is_number (pen) ? scm_to_double (pen) : 0.0;
145 SCM mpen = break_event_->get_property ("penalty");
146 if (scm_is_number (mpen))
147 total_penalty += scm_to_double (mpen);
149 command_column_->set_property ("penalty", scm_make_real (total_penalty));
151 /* ugh. arbitrary, hardcoded */
152 if (total_penalty > 10000.0)
155 SCM page_pen = command_column_->get_property ("page-penalty");
156 Real total_pp = scm_is_number (page_pen) ? scm_to_double (page_pen) : 0.0;
157 SCM mpage_pen = break_event_->get_property ("page-penalty");
158 if (scm_is_number (mpage_pen))
159 total_pp += scm_to_double (mpage_pen);
161 command_column_->set_property ("page-penalty", scm_make_real (total_pp));
165 bool start_of_measure = (last_moment_.main_part_ != now_mom ().main_part_
166 && !measure_position (context ()).main_part_);
169 We can't do this in start_translation_timestep(), since time sig
170 changes won't have happened by then.
172 if (start_of_measure)
174 Moment mlen = Moment (measure_length (context ()));
175 Grob * column = unsmob_grob (get_property ("currentCommandColumn"));
177 column->set_property ("measure-length", mlen.smobbed_copy ());
179 programming_error("No command column?");
184 Paper_column_engraver::stop_translation_timestep ()
186 for (int i = 0; i < items_.size (); i++)
188 Item *elem = items_[i];
189 if (!elem->get_parent (X_AXIS)
190 || !unsmob_grob (elem->get_object ("axis-group-parent-X")))
192 bool br = to_boolean (elem->get_property ("breakable"));
193 Axis_group_interface::add_element (br ? command_column_ : musical_column_, elem);
198 if (to_boolean (command_column_->get_property ("breakable")))
202 progress_indication ("[" + to_string (breaks_) + "]");
209 Paper_column_engraver::start_translation_timestep ()
212 TODO: don't make columns when skipTypesetting is true.
220 #include "translator.icc"
222 ADD_TRANSLATOR (Paper_column_engraver,
223 /* descr */ "Takes care of generating columns."
225 "This engraver decides whether a column is breakable. The default is "
226 "that a column is always breakable. However, when every Bar_engraver "
227 "that does not have a barline at a certain point will call "
228 "Score_engraver::forbid_breaks to stop linebreaks. In practice, this "
229 "means that you can make a breakpoint by creating a barline (assuming "
230 "that there are no beams or notes that prevent a breakpoint.) ",
231 /* creats*/ "PaperColumn NonMusicalPaperColumn",
232 /* accepts */ "break-event",
233 /* acks */ "item-interface",
235 /* write */ "currentCommandColumn currentMusicalColumn");