lily/enclosing-bracket.cc

   1 /*
   2   enclosing-bracket.cc -- implement Enclosing_bracket
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7
   8 */
   9
  10 #include "stencil.hh"
  11 #include "horizontal-bracket.hh"
  12 #include "grob.hh"
  13 #include "axis-group-interface.hh"
  14 #include "pointer-group-interface.hh"
  15
  16 struct Enclosing_bracket
  17 {
  18   DECLARE_GROB_INTERFACE ();
  19
  20 public:
  21   DECLARE_SCHEME_CALLBACK (print, (SCM));
  22   DECLARE_SCHEME_CALLBACK (width, (SCM));
  23 };
  24
  25
  26 ADD_INTERFACE (Enclosing_bracket,
  27               "Brackets alongside bass figures.",
  28
  29               /* properties */
  30               "bracket-flare "
  31               "edge-height "
  32               "elements "
  33               "padding "
  34               "shorten-pair "
  35               "thickness "
  36               );
  37
  38 /* ugh: should make bracket interface. */
  39
  40
  41 MAKE_SCHEME_CALLBACK (Enclosing_bracket, width, 1);
  42 SCM
  43 Enclosing_bracket::width (SCM grob)
  44 {
  45   /*
  46      UGH. cut & paste code.
  47   */
  48   Grob *me = unsmob_grob (grob);
  49   extract_grob_set (me, "elements", elements);
  50   if (elements.empty ())
  51     {
  52       me->suicide ();
  53       return SCM_EOL;
  54     }
  55
  56   Grob *common_x = common_refpoint_of_array (elements, me, X_AXIS);
  57   Interval xext = Axis_group_interface::relative_group_extent (elements, common_x, X_AXIS);
  58
  59   Stencil left_br = Horizontal_bracket::make_bracket (me, 10.0, Y_AXIS, LEFT);
  60   Stencil right_br = Horizontal_bracket::make_bracket (me, 10.0, Y_AXIS, LEFT);
  61
  62
  63   xext.widen (robust_scm2double (me->get_property ("padding"), 0.25));
  64   left_br.translate_axis (xext[LEFT], X_AXIS);
  65   right_br.translate_axis (xext[RIGHT], X_AXIS);
  66
  67   left_br.add_stencil (right_br);
  68   left_br.translate_axis (-me->relative_coordinate (common_x, X_AXIS), X_AXIS);
  69
  70   return ly_interval2scm (left_br.extent (X_AXIS));
  71 }
  72
  73 MAKE_SCHEME_CALLBACK (Enclosing_bracket, print, 1);
  74 SCM
  75 Enclosing_bracket::print (SCM grob)
  76 {
  77   Grob *me = unsmob_grob (grob);
  78   extract_grob_set (me, "elements", elements);
  79   if (elements.empty ())
  80     {
  81       me->suicide ();
  82       return SCM_EOL;
  83     }
  84
  85   Grob *common_x = common_refpoint_of_array (elements, me, X_AXIS);
  86   Interval xext = Axis_group_interface::relative_group_extent (elements, common_x, X_AXIS);
  87   if (xext.is_empty ())
  88     {
  89       me->programming_error ("elements have no X extent.");
  90       xext = Interval (0, 0);
  91     }
  92
  93   Stencil left_br = Horizontal_bracket::make_enclosing_bracket (me, me, elements,
  94                                                                 Y_AXIS, LEFT);
  95   Stencil right_br = Horizontal_bracket::make_enclosing_bracket (me, me, elements,
  96                                                                  Y_AXIS, RIGHT);
  97
  98   xext.widen (robust_scm2double (me->get_property ("padding"), 0.25));
  99   left_br.translate_axis (xext[LEFT], X_AXIS);
 100   right_br.translate_axis (xext[RIGHT], X_AXIS);
 101
 102   left_br.add_stencil (right_br);
 103   left_br.translate_axis (-me->relative_coordinate (common_x, X_AXIS), X_AXIS);
 104
 105   return left_br.smobbed_copy ();
 106 }
 107