Doc-es: various updates.

[lilypond.git] / lily / box.cc

diff --git a/lily/box.cc b/lily/box.cc
index 3349371d617a3a5f9063d9859796e98a96ef8940..6569493419da6a66c44077feab15ea5297c46ee9 100644 (file)
--- a/lily/box.cc
+++ b/lily/box.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1996--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1996--2015 Han-Wen Nienhuys <hanwen@xs4all.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
@@ -23,7 +23,8 @@ void
 Box::translate (Offset o)
 {
   for (Axis i = X_AXIS; i < NO_AXES; incr (i))
-    interval_a_[i] += o[i];
+    if (!is_empty (i))
+      interval_a_[i] += o[i];
 }
 
 void
@@ -33,6 +34,13 @@ Box::unite (Box b)
     interval_a_[i].unite (b[i]);
 }
 
+Real
+Box::area () const
+{
+  return interval_a_[X_AXIS].length ()
+         * interval_a_[Y_AXIS].length ();
+}
+
 Box::Box ()
 {
 }
@@ -44,6 +52,21 @@ Box::set_empty ()
   interval_a_[Y_AXIS].set_empty ();
 }
 
+bool
+Box::is_empty () const
+{
+  return is_empty (X_AXIS) && is_empty (Y_AXIS);
+}
+
+bool
+Box::is_empty (Axis a) const
+{
+  Interval empty;
+  empty.set_empty ();
+  return interval_a_[a][LEFT] == empty[LEFT]
+    && interval_a_[a][RIGHT] == empty[RIGHT];
+}
+
 Box::Box (Interval ix, Interval iy)
 {
   x () = ix;
@@ -80,7 +103,7 @@ Offset
 Box::center () const
 {
   return Offset (interval_a_[X_AXIS].center (),
-                interval_a_[Y_AXIS].center ());
+                 interval_a_[Y_AXIS].center ());
 }
 
 void
@@ -90,23 +113,24 @@ Box::widen (Real x, Real y)
   interval_a_[Y_AXIS].widen (y);
 }
 
-/****************************************************************/
-
-#include "ly-smobs.icc"
-
-IMPLEMENT_SIMPLE_SMOBS (Box);
-IMPLEMENT_TYPE_P (Box, "ly:box?");
-IMPLEMENT_DEFAULT_EQUAL_P (Box);
-
-SCM
-Box::mark_smob (SCM /* x */)
+void
+Box::intersect (Box b)
 {
-  return SCM_EOL;
+  interval_a_[X_AXIS].intersect (b[X_AXIS]);
+  interval_a_[Y_AXIS].intersect (b[Y_AXIS]);
 }
 
-int
-Box::print_smob (SCM /* x */, SCM p, scm_print_state*)
+// for debugging
+
+void
+Box::print ()
 {
-  scm_puts ("#<Box>", p);
-  return 1;
+  printf ("X left %4.4f right %4.4f Y down %4.4f up %4.4f\n",
+          interval_a_[X_AXIS][LEFT], interval_a_[X_AXIS][RIGHT],
+          interval_a_[Y_AXIS][DOWN], interval_a_[Y_AXIS][UP]);
 }
+
+/****************************************************************/
+
+
+const char * const Box::type_p_name_ = "ly:box?";