Merge branch 'master' into lilypond/translation

[lilypond.git] / lily / paper-system-scheme.cc

diff --git a/lily/paper-system-scheme.cc b/lily/paper-system-scheme.cc
index f61c5a05340d00a7bdaf7aa0702ccdfa376f6f87..137cef0c5c2f22f6d0c22febf16324babaf34206 100644 (file)
--- a/lily/paper-system-scheme.cc
+++ b/lily/paper-system-scheme.cc
@@ -1,33 +1,44 @@
-/*
-  paper-system-scheme.cc -- implement Paper_system bindings
-
+/* 
+  paper-system-scheme.cc -- implement Paper_system bindings.
+  
   source file of the GNU LilyPond music typesetter
-
-  (c) 2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  
+  (c) 2008--2009 Han-Wen Nienhuys <hanwen@lilypond.org>
+  
 */
 
-#include "paper-system.hh"
-
-
+#include "prob.hh"
 
-LY_DEFINE (ly_paper_system_property, "ly:paper-system-property",
-          2, 1, 0, (SCM system, SCM sym, SCM dfault),
-          "Return the value for @var{sym}. Properties may be set by "
-          "setting the @code{line-break-system-details} property of "
-          "NonMusicalPaperColumn.  If the property is not found, "
-          "return @var{dfault}, "
-          "or @code{'()} if undefined.")
+#include "skyline-pair.hh"
+  
+LY_DEFINE (ly_paper_system_p, "ly:paper-system?",
+         1, 0, 0, (SCM obj),
+         "Type predicate.")
 {
-  Paper_system *ps = unsmob_paper_system (system);
-  SCM_ASSERT_TYPE (ps, system, SCM_ARG1, __FUNCTION__, "paper-system");
-  if (dfault == SCM_UNDEFINED)
-    dfault = SCM_EOL;
+  return ly_prob_type_p (obj, ly_symbol2scm ("paper-system"));
+}
 
-  SCM retval = ps->internal_get_property (sym);
-  if (retval == SCM_EOL)
-    return dfault;
+LY_DEFINE (ly_paper_system_minimum_distance, "ly:paper-system-minimum-distance",
+          2, 0, 0, (SCM sys1, SCM sys2),
+          "Measure the minimum distance between these two paper-systems,"
+          " using their stored skylines if possible and falling back to"
+          " their extents otherwise.")
+{
+  Real ret = 0;
+  Prob *p1 = unsmob_prob (sys1);
+  Prob *p2 = unsmob_prob (sys2);
+  Skyline_pair *sky1 = Skyline_pair::unsmob (p1->get_property ("vertical-skylines"));
+  Skyline_pair *sky2 = Skyline_pair::unsmob (p2->get_property ("vertical-skylines"));
+
+  if (sky1 && sky2)
+    ret = (*sky1)[DOWN].distance ((*sky2)[UP]);
   else
-    return retval;
+    {
+      Stencil *s1 = unsmob_stencil (p1->get_property ("stencil"));
+      Stencil *s2 = unsmob_stencil (p2->get_property ("stencil"));
+      Interval iv1 = s1->extent (Y_AXIS);
+      Interval iv2 = s2->extent (Y_AXIS);
+      ret = iv2[UP] - iv1[DOWN];
+    }
+  return scm_from_double (ret);
 }
-
-