lily/volta-bracket.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Jan Nieuwenhuizen <janneke@gnu.org>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include <cstring>
  21 using namespace std;
  22
  23 #include "warn.hh"
  24 #include "font-interface.hh"
  25 #include "line-interface.hh"
  26 #include "paper-column.hh"
  27 #include "output-def.hh"
  28 #include "text-interface.hh"
  29 #include "volta-bracket.hh"
  30 #include "pointer-group-interface.hh"
  31 #include "side-position-interface.hh"
  32 #include "directional-element-interface.hh"
  33 #include "lookup.hh"
  34 #include "tuplet-bracket.hh"
  35
  36 /*
  37   this is too complicated. Yet another version of side-positioning,
  38   badly implemented.
  39
  40   --
  41
  42   * Should look for system_start_delim to find left edge of staff.
  43   */
  44
  45 MAKE_SCHEME_CALLBACK (Volta_bracket_interface, print, 1);
  46 SCM
  47 Volta_bracket_interface::print (SCM smob)
  48 {
  49   Spanner *me = unsmob_spanner (smob);
  50   Spanner *orig_span = dynamic_cast<Spanner *> (me->original ());
  51   bool broken_first_bracket = orig_span && (orig_span->broken_intos_[0]
  52                                             == (Spanner *)me);
  53
  54   Output_def *layout = me->layout ();
  55   Real half_space = 0.5;
  56
  57   Item *bound = dynamic_cast<Spanner *> (me)->get_bound (LEFT);
  58
  59   /*
  60     If the volta bracket appears after a line-break, make
  61     it start after the prefatory matter.
  62   */
  63   Real left = 0.;
  64   if (bound->break_status_dir () == RIGHT)
  65     {
  66       Paper_column *pc = bound->get_column ();
  67       left = pc->break_align_width (pc, ly_symbol2scm ("break-alignment"))[RIGHT]
  68         // For some reason, break_align_width is relative to
  69         // the x-parent of the column.
  70         - bound->relative_coordinate (pc->get_parent (X_AXIS), X_AXIS);
  71     }
  72   else
  73     {
  74       /*
  75         the volta spanner is attached to the bar-line, which is moved
  76         to the right. We don't need to compensate for the left edge.
  77       */
  78     }
  79
  80   modify_edge_height (me);
  81   if (!me->is_live ())
  82     return SCM_EOL;
  83
  84   Drul_array<Real> edge_height = robust_scm2interval (me->get_property ("edge-height"),
  85                                                       Interval (1.0, 1.0));
  86   Drul_array<Real> flare = robust_scm2interval (me->get_property ("bracket-flare"),
  87                                                 Interval (0, 0));
  88   Drul_array<Real> shorten = robust_scm2interval (me->get_property ("shorten-pair"),
  89                                                   Interval (0, 0));
  90
  91
  92
  93   scale_drul (&edge_height, - Real (get_grob_direction (me)));
  94
  95   Interval empty;
  96   Offset start;
  97   start[X_AXIS] = me->spanner_length () - left - half_space;
  98
  99   /*
 100     ugh, Tuplet_bracket should use Horizontal_bracket, not the other way around.
 101   */
 102   Stencil total
 103     = Tuplet_bracket::make_bracket (me, Y_AXIS, start,
 104                                     edge_height, empty, flare, shorten);
 105
 106   if (!orig_span || broken_first_bracket)
 107     {
 108       SCM text = me->get_property ("text");
 109       SCM properties = me->get_property_alist_chain (SCM_EOL);
 110       SCM snum = Text_interface::interpret_markup (layout->self_scm (),
 111                                                    properties, text);
 112       Stencil num = *unsmob_stencil (snum);
 113       num.align_to (Y_AXIS, UP);
 114       num.translate_axis (-0.5, Y_AXIS);
 115       total.add_at_edge (X_AXIS, LEFT, num, - num.extent (X_AXIS).length ()
 116                          - 1.0);
 117     }
 118
 119   total.translate_axis (left, X_AXIS);
 120   return total.smobbed_copy ();
 121 }
 122
 123
 124 void
 125 Volta_bracket_interface::modify_edge_height (Spanner *me)
 126 {
 127   Spanner *orig_span = dynamic_cast<Spanner *> (me->original ());
 128
 129   bool broken_first_bracket = orig_span && (orig_span->broken_intos_[0] == (Spanner *)me);
 130   bool broken_last_bracket = orig_span && (orig_span->broken_intos_.back () == (Spanner *)me);
 131   bool no_vertical_start = orig_span && !broken_first_bracket;
 132   bool no_vertical_end = orig_span && !broken_last_bracket;
 133
 134   extract_grob_set (me, "bars", bars);
 135   Grob *endbar = bars.size () ? bars.back () : 0;
 136   SCM glyph = endbar ? endbar->get_property ("glyph-name") : SCM_EOL;
 137
 138   string str;
 139   if (scm_is_string (glyph))
 140     str = ly_scm2string (glyph);
 141   else
 142     str = "|";
 143
 144   no_vertical_end
 145     |= (str != ":|"
 146         && str != "|:"
 147         && str != "|."
 148         && str != ":|:"
 149         && str != ":|.|:"
 150         && str != ":|.:"
 151         && str != ".|");
 152
 153   if (no_vertical_end || no_vertical_start)
 154     {
 155       Drul_array<Real> edge_height = robust_scm2interval (me->get_property ("edge-height"),
 156                                                           Interval (1.0, 1.0));
 157       if (no_vertical_start)
 158         edge_height[LEFT] = 0.0;
 159
 160       if (no_vertical_end)
 161         edge_height[RIGHT] = 0.0;
 162
 163       me->set_property ("edge-height", ly_interval2scm (edge_height));
 164     }
 165
 166   if (broken_last_bracket && no_vertical_end && no_vertical_start
 167       && !broken_first_bracket)
 168     me->suicide ();
 169 }
 170
 171 void
 172 Volta_bracket_interface::add_bar (Grob *me, Item *b)
 173 {
 174   Pointer_group_interface::add_grob (me, ly_symbol2scm ("bars"), b);
 175   add_bound_item (dynamic_cast<Spanner *> (me), b);
 176 }
 177
 178 ADD_INTERFACE (Volta_bracket_interface,
 179                "Volta bracket with number.",
 180
 181                /* properties */
 182                "bars "
 183                "thickness "
 184                "height "
 185                );
 186