Web-ja: update introduction

[lilypond.git] / lily / measure-grouping-spanner.cc

diff --git a/lily/measure-grouping-spanner.cc b/lily/measure-grouping-spanner.cc
index fb9da592c95416982ccad332b99cb4400e435ba8..052aae12ac6071a5799de95728f7bf0e33efa4b2 100644 (file)
--- a/lily/measure-grouping-spanner.cc
+++ b/lily/measure-grouping-spanner.cc
@@ -1,60 +1,70 @@
-/*   
-measure-grouping-spanner.cc --  implement Measure_grouping
+/*
+  This file is part of LilyPond, the GNU music typesetter.
 
-source file of the GNU LilyPond music typesetter
+  Copyright (C) 2002--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-(c) 2002--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
+*/
 
- */
-#include "paper-def.hh"
-#include "spanner.hh"
 #include "measure-grouping-spanner.hh"
-#include "lookup.hh" 
+
+#include "output-def.hh"
+#include "spanner.hh"
+#include "lookup.hh"
 #include "item.hh"
+#include "staff-symbol-referencer.hh"
 
-MAKE_SCHEME_CALLBACK (Measure_grouping, brew_molecule, 1);
-SCM 
-Measure_grouping::brew_molecule (SCM grob)
+MAKE_SCHEME_CALLBACK (Measure_grouping, print, 1);
+SCM
+Measure_grouping::print (SCM grob)
 {
-  Spanner * me = dynamic_cast<Spanner*> (unsmob_grob (grob));
+  Spanner *me = unsmob<Spanner> (grob);
+
+  SCM which = me->get_property ("style");
+  Real height = robust_scm2double (me->get_property ("height"), 1);
+
+  Real t = Staff_symbol_referencer::line_thickness (me) * robust_scm2double (me->get_property ("thickness"), 1);
+  Grob *common = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT),
+                                                        X_AXIS);
+
+  Real right_point = robust_relative_extent (me->get_bound (RIGHT),
+                                             common, X_AXIS).linear_combination (CENTER);
+  Real left_point = me->get_bound (LEFT)->relative_coordinate (common, X_AXIS);
+
+  Interval iv (left_point, right_point);
+  Stencil m;
 
   /*
-    TODO: robustify.
-   */
-  SCM which = me->get_grob_property ("style");
-  SCM thick = me->get_grob_property ("thickness");
-  SCM height = me->get_grob_property ("height");
-
-  Real t = me->get_paper ()->get_var ("linethickness") *   gh_scm2double (thick); 
-  Grob *common = me->get_bound(LEFT)->common_refpoint (me->get_bound (RIGHT),
-                                                      X_AXIS);
-
-  Interval rext = me->get_bound (RIGHT)->extent (common, X_AXIS);
-  
-  
-  Real w =(rext.empty_b()
-          ? me->get_bound (RIGHT)->relative_coordinate (common, X_AXIS)
-          : rext[RIGHT])
-    - me->get_bound (LEFT)->relative_coordinate (common, X_AXIS);
-
-  Interval iv (0,w);
-
-  Molecule m; 
-  if (which == ly_symbol2scm ("bracket"))
-    {
-      m = Lookup::bracket (X_AXIS, iv, t,-gh_scm2double (height));
-    }
-  else if (which == ly_symbol2scm ("triangle"))
-    {
-      m = Lookup::triangle (iv, t, gh_scm2double (height));
-    }
+    TODO: use line interface
+  */
+  if (scm_is_eq (which, ly_symbol2scm ("bracket")))
+    m = Lookup::bracket (X_AXIS, iv, t, -height, t);
+  else if (scm_is_eq (which, ly_symbol2scm ("triangle")))
+    m = Lookup::triangle (iv, t, height);
 
   m.align_to (Y_AXIS, DOWN);
-  return m.smobbed_copy();
+  m.translate_axis (- me->relative_coordinate (common, X_AXIS), X_AXIS);
+  return m.smobbed_copy ();
 }
 
-ADD_INTERFACE (Measure_grouping,"measure-grouping-interface",
-              "indicate groups of beats. Valid choices for 'type are 'bracket and 'triangle.",
-              "thickness style height");
+ADD_INTERFACE (Measure_grouping,
+               "This object indicates groups of beats.  Valid choices for"
+               " @code{style} are @code{bracket} and @code{triangle}.",
+
+               /* properties */
+               "thickness "
+               "style "
+               "height "
+              );
 
-