X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fbox.cc;h=68d53b39f69b73e2cf5c783ea96795c552ee3e47;hb=9e781b7dc83b60a543ce218aa1a5f139f74c760f;hp=5c2af4d317b41f871b215450cd1925e8ce7a064f;hpb=e8b9253c5405efaf70cdc473d80eb9764ebc0149;p=lilypond.git

diff --git a/lily/box.cc b/lily/box.cc
index 5c2af4d317..68d53b39f6 100644
--- a/lily/box.cc
+++ b/lily/box.cc
@@ -1,9 +1,20 @@
 /*
-  box.cc -- implement Box
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 1996--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-  (c) 1996--2008 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
+  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 "box.hh"
@@ -12,7 +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
@@ -22,6 +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 ()
 {
 }
@@ -33,6 +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;
@@ -69,7 +103,7 @@ Offset
 Box::center () const
 {
   return Offset (interval_a_[X_AXIS].center (),
-		 interval_a_[Y_AXIS].center ());
+                 interval_a_[Y_AXIS].center ());
 }
 
 void
@@ -79,6 +113,23 @@ Box::widen (Real x, Real y)
   interval_a_[Y_AXIS].widen (y);
 }
 
+void
+Box::intersect (Box b)
+{
+  interval_a_[X_AXIS].intersect (b[X_AXIS]);
+  interval_a_[Y_AXIS].intersect (b[Y_AXIS]);
+}
+
+// for debugging
+
+void
+Box::print ()
+{
+  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]);
+}
+
 /****************************************************************/
 
 #include "ly-smobs.icc"
@@ -94,7 +145,7 @@ Box::mark_smob (SCM /* x */)
 }
 
 int
-Box::print_smob (SCM /* x */, SCM p, scm_print_state*)
+Box::print_smob (SCM /* x */, SCM p, scm_print_state *)
 {
   scm_puts ("#<Box>", p);
   return 1;