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
  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           Character_metric const *c = get_char ((unsigned char)text[i],false);
  35
  36           // Ugh, use the width of 'x' for unknown characters
  37           if (c->dimensions()[X_AXIS].length () == 0)
  38             c = get_char ((unsigned char)'x',false);
  39
  40           w += c->dimensions()[X_AXIS].length ();
  41           ydims.unite (c->dimensions()[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
  61 Box
  62 Character_metric::dimensions () const
  63 {
  64   return Box(Interval(0,0), Interval(0,0));
  65 }
  66
  67 Font_metric::~Font_metric ()
  68 {
  69 }
  70
  71 Character_metric::~Character_metric()
  72 {
  73 }
  74
  75 Character_metric const *
  76 Font_metric::get_char (int, bool)const
  77 {
  78   return 0;
  79 }
  80
  81 Scaled_font_metric::Scaled_font_metric (Font_metric* m, int s)
  82 {
  83   magstep_i_ = s;
  84   orig_l_ = m;
  85 }
  86
  87 SCM
  88 Font_metric::description () const
  89 {
  90   return gh_cons (ly_symbol2scm (name_str_.ch_C()), gh_int2scm (0));
  91 }
  92
  93
  94 SCM
  95 Scaled_font_metric::description () const
  96 {
  97   SCM od = orig_l_->description ();
  98   gh_set_cdr_x (od, gh_int2scm (magstep_i_));
  99   return od;
 100 }