X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;ds=sidebyside;f=flower%2Foffset.cc;h=4693c113ef05b488d7cae97ea3f8da09e7852a28;hb=c9803f36f9ca585c15024e16b1cbef0bce0b31b3;hp=f578b191f9a4c8b93f4f694a8b8f06beefb522c8;hpb=16cb456cabf477f6d398ff731aa0f10b60913394;p=lilypond.git

diff --git a/flower/offset.cc b/flower/offset.cc
index f578b191f9..4693c113ef 100644
--- a/flower/offset.cc
+++ b/flower/offset.cc
@@ -3,12 +3,11 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  (c) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
 */
 
 #include "offset.hh"
 
-
 #ifndef STANDALONE
 string
 Offset::to_string () const
@@ -20,12 +19,6 @@ Offset::to_string () const
 }
 #endif
 
-bool
-isinf_b (Real r)
-{
-  return (fabs (r) > 1e20);
-}
-
 /*
   free bsd fix by John Galbraith
 */
@@ -34,7 +27,7 @@ Offset
 complex_multiply (Offset z1, Offset z2)
 {
   Offset z;
-  if (!isinf_b (z2[Y_AXIS]))
+  if (!isinf (z2[Y_AXIS]))
     {
       z[X_AXIS] = z1[X_AXIS] * z2[X_AXIS] - z1[Y_AXIS] * z2[Y_AXIS];
       z[Y_AXIS] = z1[X_AXIS] * z2[Y_AXIS] + z1[Y_AXIS] * z2[X_AXIS];
@@ -75,6 +68,11 @@ Offset::arg () const
   return atan2 (coordinate_a_[Y_AXIS], coordinate_a_[X_AXIS]);
 }
 
+Real
+Offset::angle_degrees () const
+{
+  return arg () * 180 / M_PI;
+}
 /**
    euclidian vector length / complex modulus
 */
@@ -91,5 +89,19 @@ Offset::is_sane () const
   return !isnan (coordinate_a_[X_AXIS])
     && !isnan (coordinate_a_ [Y_AXIS])
     && !isinf (coordinate_a_[X_AXIS]) 
-    && !isnan (coordinate_a_[Y_AXIS]);
+    && !isinf (coordinate_a_[Y_AXIS]);
+}
+
+Offset
+Offset::direction () const
+{
+  Offset d = *this;
+  d /= length (); 
+  return d;
+}
+
+Offset
+Offset::swapped () const
+{
+  return Offset (coordinate_a_[Y_AXIS], coordinate_a_[X_AXIS]);
 }