lily/side-position-interface.cc

   1 /*
   2   staff-side.cc --  implement Staff_side_element
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9 #include <math.h>               // ceil.
  10
  11 #include "side-position-interface.hh"
  12 #include "staff-symbol.hh"
  13 #include "debug.hh"
  14 #include "warn.hh"
  15 #include "dimensions.hh"
  16 #include "dimension-cache.hh"
  17 #include "staff-symbol-referencer.hh"
  18
  19 Side_position_interface::Side_position_interface (Score_element const *e)
  20 {
  21   elt_l_ = (Score_element*)e;
  22 }
  23
  24
  25 void
  26 Side_position_interface::add_support (Score_element*e)
  27 {
  28   SCM sup = elt_l_->get_elt_property ("side-support");
  29   elt_l_->set_elt_property ("side-support",
  30                             gh_cons (e->self_scm_,sup));
  31 }
  32
  33
  34
  35 Direction
  36 Side_position_interface::get_direction () const
  37 {
  38   SCM d = elt_l_->get_elt_property ("direction");
  39   if (isdir_b (d))
  40     return to_dir (d) ? to_dir (d) : DOWN;
  41
  42   Direction relative_dir = UP;
  43   SCM reldir = elt_l_->get_elt_property ("side-relative-direction");    // should use a lambda.
  44   if (isdir_b (reldir))
  45     {
  46       relative_dir = to_dir (reldir);
  47     }
  48
  49   SCM other_elt = elt_l_->get_elt_property ("direction-source");
  50   Score_element * e = unsmob_element(other_elt);
  51   if (e)
  52     {
  53       return (Direction)(relative_dir * Side_position_interface (e).get_direction ());
  54     }
  55
  56   return DOWN;
  57 }
  58
  59 /**
  60    Callback that does the aligning.
  61  */
  62 Real
  63 Side_position_interface::side_position (Dimension_cache const * c)
  64 {
  65   Score_element * me = dynamic_cast<Score_element*> (c->element_l ());
  66
  67   Interval dim;
  68   Axis  axis = c->axis ();
  69   Score_element *common = me->parent_l (axis);
  70   SCM support = me->get_elt_property ("side-support");
  71   for (SCM s = support; s != SCM_EOL; s = gh_cdr (s))
  72     {
  73       Score_element * e  = unsmob_element ( gh_car (s));
  74       if (e)
  75         common = common->common_refpoint (e, axis);
  76     }
  77
  78   for (SCM s = support; s != SCM_EOL; s = gh_cdr (s))
  79     {
  80
  81       Score_element * e  = unsmob_element ( gh_car (s));
  82       if (e)
  83         {
  84           Real coord = e->relative_coordinate (common, axis);
  85
  86           dim.unite (coord + e->extent (axis));
  87         }
  88     }
  89
  90   if (dim.empty_b ())
  91     {
  92       dim = Interval(0,0);
  93     }
  94
  95   Real off =  me->parent_l (axis)->relative_coordinate (common, axis);
  96
  97
  98   Direction dir = Side_position_interface (me).get_direction ();
  99
 100   SCM pad = me->remove_elt_property ("padding");
 101   if (gh_number_p (pad))
 102     {
 103       off += gh_scm2double (pad) * dir;
 104     }
 105   Real total_off = dim[dir] + off;
 106
 107   if (fabs (total_off) > 100 CM)
 108     programming_error ("Huh ? Improbable staff side dim.");
 109
 110   return total_off;
 111 }
 112
 113 Real
 114 Side_position_interface::self_alignment (Dimension_cache const *c)
 115 {
 116   String s ("self-alignment-");
 117   Axis ax = c->axis ();
 118   s +=  (ax == X_AXIS) ? "X" : "Y";
 119   Score_element *elm = dynamic_cast<Score_element*> (c->element_l ());
 120   SCM align (elm->get_elt_property (s));
 121   if (isdir_b (align))
 122     {
 123       Direction d = to_dir (align);
 124       Interval ext(elm->extent (ax));
 125       if (d)
 126         {
 127           return - ext[d];
 128         }
 129       return - ext.center ();
 130     }
 131   else
 132     return 0.0;
 133 }
 134
 135
 136 Real
 137 directed_round (Real f, Direction d)
 138 {
 139   if (d < 0)
 140     return floor (f);
 141   else
 142     return ceil (f);
 143 }
 144
 145 Real
 146 Side_position_interface::quantised_position (Dimension_cache const *c)
 147 {
 148   Score_element * me = dynamic_cast<Score_element*> (c->element_l ());
 149   Side_position_interface s(me);
 150   Direction d = s.get_direction ();
 151   Staff_symbol_referencer_interface si (me);
 152
 153   if (si.has_interface_b ())
 154     {
 155       Real p = si.position_f ();
 156       Real rp = directed_round (p, d);
 157
 158       int ip = int  (rp);
 159       if ((ip % 2) == 0)
 160         {
 161           ip += d;
 162           rp += d;
 163         }
 164
 165       return (rp - p) * si.staff_space () / 2.0;
 166     }
 167   return 0.0;
 168 }
 169
 170 Real
 171 Side_position_interface::aligned_side (Dimension_cache const *c)
 172 {
 173   Score_element * me = dynamic_cast<Score_element*> (c->element_l ());
 174   Side_position_interface s(me);
 175   Direction d = s.get_direction ();
 176   Axis ax = c->axis ();
 177   Real o = side_position (c);
 178
 179   Interval iv =  me->extent (ax);
 180
 181   if (!iv.empty_b ())
 182     {
 183       o += - iv[-d];
 184
 185       SCM pad = me->get_elt_property ("padding");
 186       if (gh_number_p (pad))
 187         o += d *gh_scm2double (pad) ;
 188     }
 189   return o;
 190 }
 191
 192
 193
 194
 195 void
 196 Side_position_interface::set_axis (Axis a)
 197 {
 198   // prop transparent ?
 199   if (elt_l_->get_elt_property ("side-support") == SCM_UNDEFINED)
 200     elt_l_->set_elt_property ("side-support" ,SCM_EOL);
 201
 202   elt_l_->dim_cache_[a]->off_callbacks_.push (aligned_side);
 203 }
 204
 205
 206 void
 207 Side_position_interface::set_quantised (Axis a)
 208 {
 209   Dimension_cache * c = elt_l_->dim_cache_[a];
 210
 211   c->off_callbacks_.push (quantised_position);
 212 }
 213
 214 Axis
 215 Side_position_interface::get_axis () const
 216 {
 217   Dimension_cache * c =  elt_l_->dim_cache_[X_AXIS];
 218   for (int i=0 ; i < c->off_callbacks_.size();i ++)
 219     if (c->off_callbacks_[i] == side_position
 220         ||c->off_callbacks_[i] == aligned_side)
 221       return X_AXIS;
 222
 223
 224   return Y_AXIS;
 225 }
 226
 227 void
 228 Side_position_interface::set_direction (Direction d)
 229 {
 230   elt_l_->set_elt_property ("direction", gh_int2scm (d));
 231 }
 232
 233 bool
 234 Side_position_interface::has_interface_b () const
 235 {
 236   return elt_l_->get_elt_property ("side-support") != SCM_UNDEFINED;
 237 }
 238
 239 bool
 240 Side_position_interface::supported_b () const
 241 {
 242   SCM s =elt_l_->get_elt_property  ("side-support");
 243   return s != SCM_UNDEFINED && s != SCM_EOL;
 244 }