2002-07-13 Han-Wen <hanwen@cs.uu.nl>

[lilypond.git] / lily / font-metric.cc

diff --git a/lily/font-metric.cc b/lily/font-metric.cc
index b421075119a2b9fcd61e7a33e999f49aa4d23999..c2c9999d8fe77206f95708fe63ece39b4f0f6f07 100644 (file)
--- a/lily/font-metric.cc
+++ b/lily/font-metric.cc
@@ -3,7 +3,7 @@
   
   source file of the GNU LilyPond music typesetter
   
-  (c) 1999--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1999--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 
     Mats Bengtsson <matsb@s3.kth.se> (the ugly TeX parsing in text_dimension)
  */
@@ -86,10 +86,15 @@ Font_metric::Font_metric ()
   smobify_self ();
 }
 
-Font_metric::Font_metric (Font_metric const &s)
+Font_metric::Font_metric (Font_metric const &)
 {
 }
 
+int
+Font_metric::count () const
+{
+  return 0;
+}
 
 Box 
 Font_metric::get_char (int)const
@@ -116,7 +121,7 @@ Font_metric::print_smob (SCM s, SCM port, scm_print_state *)
 }
 
 
-IMPLEMENT_UNSMOB (Font_metric, metrics);
+
 IMPLEMENT_SMOBS (Font_metric);
 IMPLEMENT_DEFAULT_EQUAL_P (Font_metric);
 IMPLEMENT_TYPE_P (Font_metric, "font-metric?");
@@ -129,24 +134,33 @@ Font_metric::find_by_name (String) const
 }
 
 
-SCM
-ly_find_glyph_by_name (SCM font, SCM name)
+LY_DEFINE(ly_find_glyph_by_name, "ly-find-glyph-by-name", 2 , 0, 0,
+         (SCM font, SCM name),
+         "This function retrieves a Molecule for the glyph named @var{name} in
+@var{font}.  The font must be available as an AFM file.")
 {
-  if (!unsmob_metrics (font) || !gh_string_p (name))
-    {
-      warning ("ly-find-glyph-by-name: invalid argument.");
-      Molecule m;
-      return m.smobbed_copy ();
-    }
+  Font_metric *fm = unsmob_metrics (font);
+  SCM_ASSERT_TYPE(fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
+  SCM_ASSERT_TYPE(gh_string_p (name), name, SCM_ARG2, __FUNCTION__, "string");
 
-  return unsmob_metrics (font)->find_by_name (ly_scm2string (name)).smobbed_copy ();
+  return fm->find_by_name (ly_scm2string (name)).smobbed_copy ();
 }
 
 
-static void
-font_metric_init ()
+LY_DEFINE(ly_text_dimension,"ly-text-dimension", 2 , 0, 0,
+         (SCM font, SCM text),
+         "Given the font metric in @var{font} and the string @var{text}, compute
+the extents of that text in that font. The return value is a pair of
+number-pairs.")
 {
-   scm_make_gsubr ("ly-find-glyph-by-name", 2 , 0, 0, (Scheme_function_unknown) ly_find_glyph_by_name);
+  Box b;
+  Font_metric *fm = unsmob_metrics (font);
+  SCM_ASSERT_TYPE(fm, font, SCM_ARG1, __FUNCTION__, "font-metric");
+  SCM_ASSERT_TYPE(gh_string_p (text), text, SCM_ARG2, __FUNCTION__, "string");
+
+  b = fm->text_dimension (ly_scm2string (text));
+  
+  return gh_cons (ly_interval2scm (b[X_AXIS]), ly_interval2scm(b[Y_AXIS]));
 }
 
-ADD_SCM_INIT_FUNC (font_metric_init, font_metric_init);
+