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