lily/balloon.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2004--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   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 "text-interface.hh"
  21 #include "grob.hh"
  22 #include "line-interface.hh"
  23 #include "lookup.hh"
  24 #include "font-interface.hh"
  25 #include "lily-guile.hh"
  26 #include "output-def.hh"
  27 #include "misc.hh"
  28
  29 class Balloon_interface
  30 {
  31 public:
  32   DECLARE_SCHEME_CALLBACK (print, (SCM));
  33   DECLARE_GROB_INTERFACE ();
  34 };
  35
  36 MAKE_SCHEME_CALLBACK (Balloon_interface, print, 1);
  37 SCM
  38 Balloon_interface::print (SCM smob)
  39 {
  40   Grob *me = unsmob_grob (smob);
  41
  42   Grob *p = me->get_parent (X_AXIS);
  43
  44   Offset off (me->relative_coordinate (p, X_AXIS),
  45               me->relative_coordinate (p, Y_AXIS));
  46
  47   Box b (p->extent (p, X_AXIS),
  48          p->extent (p, Y_AXIS));
  49
  50   Real padding = robust_scm2double (me->get_property ("padding"), .1);
  51   b.widen (padding, padding);
  52
  53   // FIXME
  54   Stencil fr = Lookup::frame (b, 0.1, 0.05);
  55
  56   SCM bt = me->get_property ("text");
  57   SCM chain = Font_interface::text_font_alist_chain (me);
  58
  59   SCM stencil = Text_interface::interpret_markup (me->layout ()->self_scm (),
  60                                                   chain, bt);
  61
  62   Stencil *text_stil = unsmob_stencil (stencil);
  63
  64   Offset z1;
  65   for (int i = X_AXIS; i < NO_AXES; i++)
  66     {
  67       Axis a ((Axis)i);
  68       z1[a] = b[a].linear_combination (sign (off[a]));
  69       text_stil->align_to (a, -sign (off[a]));
  70     }
  71
  72   Offset z2 = z1 + off;
  73
  74   fr.add_stencil (Line_interface::line (me, z1, z2));
  75
  76   text_stil->translate (z2);
  77   fr.add_stencil (*text_stil);
  78
  79   fr.translate (-off);
  80   return fr.smobbed_copy ();
  81 }
  82
  83 ADD_INTERFACE (Balloon_interface,
  84                "A collection of routines to put text balloons around an"
  85                " object.",
  86
  87                /* properties */
  88                "padding "
  89                "text "
  90                );
  91