lily/font-metric.cc

   1 /*
   2   font-metric.cc --  implement Font_metric
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8     Mats Bengtsson <matsb@s3.kth.se>  (the ugly TeX parsing in text_dimension)
   9  */
  10
  11 #include <math.h>
  12 #include <ctype.h>
  13
  14 #include "ly-smobs.icc"
  15 #include "font-metric.hh"
  16
  17 Box
  18 Font_metric::text_dimension (String text) const
  19 {
  20   Interval ydims;
  21   Real w=0.0;
  22
  23   for (int i = 0; i < text.length_i (); i++)
  24     {
  25
  26       switch (text[i])
  27         {
  28         case '\\':
  29           for (i++; (i < text.length_i ()) && !isspace(text[i])
  30                  && text[i]!='{' && text[i]!='}'; i++)
  31             ;
  32           // ugh.
  33           i--; // Compensate for the increment in the outer loop!
  34           break;
  35         case '{':  // Skip '{' and '}'
  36         case '}':
  37           break;
  38
  39         default:
  40           Box b = get_char ((unsigned char)text[i],false);
  41
  42           // Ugh, use the width of 'x' for unknown characters
  43           if (b[X_AXIS].length () == 0)
  44             b = get_char ((unsigned char)'x',false);
  45
  46           w += b[X_AXIS].length ();
  47           ydims.unite (b[Y_AXIS]);
  48           break;
  49         }
  50     }
  51   if (ydims.empty_b ())
  52     ydims = Interval (0,0);
  53
  54   return Box(Interval (0, w), ydims);
  55 }
  56
  57
  58 Box
  59 Scaled_font_metric::text_dimension (String t) const
  60 {
  61   Real realmag = pow (1.2, magstep_i_);
  62   Box b (orig_l_->text_dimension (t));
  63
  64   return Box(b[X_AXIS]* realmag, b[Y_AXIS]*realmag);
  65 }
  66
  67 Font_metric::~Font_metric ()
  68 {
  69   unsmobify_self ();
  70 }
  71
  72 Font_metric::Font_metric ()
  73 {
  74   self_scm_ = SCM_EOL;
  75   name_ = SCM_EOL;
  76   smobify_self ();
  77 }
  78
  79 Font_metric::Font_metric (Font_metric const &)
  80 {
  81 }
  82
  83
  84 Box
  85 Font_metric::get_char (int, bool)const
  86 {
  87   return Box (Interval(0,0),Interval (0,0));
  88 }
  89
  90 Scaled_font_metric::Scaled_font_metric (Font_metric* m, int s)
  91 {
  92   magstep_i_ = s;
  93   orig_l_ = m;
  94 }
  95
  96 SCM
  97 Font_metric::description () const
  98 {
  99   return gh_cons (name_, gh_int2scm (0));
 100 }
 101
 102
 103 SCM
 104 Scaled_font_metric::description () const
 105 {
 106   SCM od = orig_l_->description ();
 107   gh_set_cdr_x (od, gh_int2scm (magstep_i_));
 108   return od;
 109 }
 110
 111
 112 void
 113 Font_metric::do_smobify_self ()
 114 {
 115 }
 116
 117 SCM
 118 Font_metric::mark_smob (SCM s)
 119 {
 120   Font_metric * m = SMOB_TO_TYPE(Font_metric, s);
 121   return m->name_;
 122 }
 123
 124 int
 125 Font_metric::print_smob (SCM s, SCM port, scm_print_state * )
 126 {
 127   Font_metric *m = unsmob_metrics (s);
 128   scm_puts ("#<Font_metric ", port);
 129   scm_display (m->name_, port);
 130   scm_puts (">", port);
 131   return 1;
 132 }
 133
 134
 135 IMPLEMENT_UNSMOB (Font_metric, metrics);
 136 IMPLEMENT_SMOBS (Font_metric);
 137