lily/balloon.cc

   1 /*
   2   balloon.cc -- implement Balloon
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2004--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "text-interface.hh"
  10 #include "grob.hh"
  11 #include "line-interface.hh"
  12 #include "lookup.hh"
  13 #include "font-interface.hh"
  14 #include "lily-guile.hh"
  15 #include "output-def.hh"
  16 #include "misc.hh"
  17
  18 class Balloon_interface
  19 {
  20 public:
  21   DECLARE_SCHEME_CALLBACK (print, (SCM));
  22   DECLARE_GROB_INTERFACE ();
  23 };
  24
  25 MAKE_SCHEME_CALLBACK (Balloon_interface, print, 1);
  26 SCM
  27 Balloon_interface::print (SCM smob)
  28 {
  29   Grob *me = unsmob_grob (smob);
  30
  31   Grob *p = me->get_parent (X_AXIS);
  32
  33   Offset off (me->relative_coordinate (p, X_AXIS),
  34               me->relative_coordinate (p, Y_AXIS));
  35
  36   Box b (p->extent (p, X_AXIS),
  37          p->extent (p, Y_AXIS));
  38
  39   Real padding = robust_scm2double (me->get_property ("padding"), .1);
  40   b.widen (padding, padding);
  41
  42   // FIXME
  43   Stencil fr = Lookup::frame (b, 0.1, 0.05);
  44
  45   SCM bt = me->get_property ("text");
  46   SCM chain = Font_interface::text_font_alist_chain (me);
  47
  48   SCM stencil = Text_interface::interpret_markup (me->layout ()->self_scm (),
  49                                                   chain, bt);
  50
  51   Stencil *text_stil = unsmob_stencil (stencil);
  52
  53   Offset z1;
  54   for (int i = X_AXIS; i < NO_AXES; i++)
  55     {
  56       Axis a ((Axis)i);
  57       z1[a] = b[a].linear_combination (sign (off[a]));
  58       text_stil->align_to (a, -sign (off[a]));
  59     }
  60
  61   Offset z2 = z1 + off;
  62
  63   fr.add_stencil (Line_interface::line (me, z1, z2));
  64
  65   text_stil->translate (z2);
  66   fr.add_stencil (*text_stil);
  67
  68   fr.translate (-off);
  69   return fr.smobbed_copy ();
  70 }
  71
  72 ADD_INTERFACE (Balloon_interface,
  73                "A collection of routines to put text balloons around an"
  74                " object.",
  75
  76                /* properties */
  77                "padding "
  78                "text "
  79                );
  80