X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=flower%2Finclude%2Finterval.hh;h=be7074c242bec76dc2a599e4e9359e6ad9e73556;hb=e90f0536f9be39ada0bef0aeb0d275dec3b2fb5b;hp=413b6b78d5ca164deecca23f854a6b355aaf0dab;hpb=ff3d20fcb28e7ccf0fa9ad242dc16afb9cf0f7ba;p=lilypond.git

diff --git a/flower/include/interval.hh b/flower/include/interval.hh
index 413b6b78d5..be7074c242 100644
--- a/flower/include/interval.hh
+++ b/flower/include/interval.hh
@@ -1,149 +1,180 @@
 /*
-  interval.hh -- part of flowerlib
-  
-  (c)  1996--2003 Han-Wen Nienhuys
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 1996--2011 Han-Wen Nienhuys
+
+  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/>.
 */
 
 #ifndef INTERVAL_HH
 #define INTERVAL_HH
 
-#include <assert.h> 
+#include <math.h>
+
 #include "flower-proto.hh"
-#include "real.hh"
 #include "drul-array.hh"
 
-/** a T interval.  this represents the closed interval [left,right].
-  No invariants. T must be a totally ordered ring (with division, anyway ..)
-  At instantiation, the function infinity () has to be defined explicitely.
-  
-  */
+/* A T interval.  This represents the closed interval [left,right].
+   No invariants.  T must be a totally ordered ring (with division, anyway ..)
+   At instantiation, the function infinity () has to be defined explicitly. */
 template<class T>
-struct Interval_t : public Drul_array<T> {
-
-  /* ************** */
-    
-  static T infinity () ;
-  static String T_to_string (T arg);
-  T center () const {
-    assert (!is_empty ());
-    return (elem (LEFT) + elem (RIGHT)) / T (2);
-  }
+struct Interval_t : public Drul_array<T>
+{
+  Drul_array<T>::at;
+
+  static T infinity ();
+  static string T_to_string (T arg);
+  T center () const;
   void translate (T t)
-    {
-      elem (LEFT) += t;
-      elem (RIGHT) += t;
-    }
+  {
+    at (LEFT) += t;
+    at (RIGHT) += t;
+  }
   void widen (T t)
   {
-    elem (LEFT) -= t;
-    elem (RIGHT) += t;    
+    at (LEFT) -= t;
+    at (RIGHT) += t;
+  }
+
+  T distance (T t) const
+  {
+    if (t > at (RIGHT))
+      return T (t - at (RIGHT));
+    else if (t < at (LEFT))
+      return T (at (LEFT) - t);
+    else
+      return T (0);
   }
-  
   /**
-    PRE
-    *this and h are comparable
-    */
+     PRE
+     *this and h are comparable
+     */
   void unite (Interval_t<T> h);
   void intersect (Interval_t<T> h);
-  void add_point (T p) {
-    elem(LEFT) = elem (LEFT) <? p;
-    elem(RIGHT) = elem (RIGHT) >? p;
+  void add_point (T p)
+  {
+    at (LEFT) = min (at (LEFT), p);
+    at (RIGHT) = max (at (RIGHT), p);
   }
   T length () const;
+
+  // Returns RIGHT - LEFT, even if the interval is empty.
   T delta () const;
-  void set_empty () ;
+  void set_empty ();
   void set_full ();
 
-  /*
-    TODO: strip hungarian suffix.
-   */
-  bool is_empty () const { return elem (LEFT) > elem (RIGHT); }
-  bool contains_b (Interval_t<T> const&) const;
-  Interval_t () {
+  void unite_disjoint (Interval_t<T> h, T padding, Direction d);
+  Interval_t<T> union_disjoint (Interval_t<T> h, T padding, Direction d) const;
+
+  bool is_empty () const
+  {
+    return at (LEFT) > at (RIGHT);
+  }
+  bool superset (Interval_t<T> const &) const;
+  Interval_t ()
+  {
     set_empty ();
   }
-  Interval_t (T m, T M) : Drul_array<T> (m,M)
-    {
-    }
-  Interval_t<T> &operator -= (T r) {
+  Interval_t (Drul_array<T> const &src)
+    : Drul_array<T> (src)
+  {
+  }
+
+  Interval_t (T m, T M) : Drul_array<T> (m, M)
+  {
+  }
+  Interval_t<T> &operator -= (T r)
+  {
     *this += -r;
     return *this;
   }
 
-  Interval_t<T> &operator += (T r) {
-    elem (LEFT) += r;
-    elem (RIGHT) +=r;
+  Interval_t<T> &operator += (T r)
+  {
+    at (LEFT) += r;
+    at (RIGHT) += r;
     return *this;
   }
-  Interval_t<T> &operator *= (T r) {
+  Interval_t<T> &operator *= (T r)
+  {
     if (!is_empty ())
       {
-	elem (LEFT) *= r;
-	elem (RIGHT) *= r;
+	at (LEFT) *= r;
+	at (RIGHT) *= r;
 	if (r < T (0))
-	  swap();
-
+	  swap ();
       }
     return *this;
   }
 
-  Real linear_combination (Real x) const {
-    return ((1.0 - x) * Real (elem (LEFT))  + (x + 1.0) * Real (elem (RIGHT))) * 0.5;
-  }
-  String to_string () const;    
-
-  bool contains (T r);
-  void negate () {
-    T r = -elem (LEFT);
-    T l = -elem (RIGHT);
-    elem (LEFT) = l;
-    elem (RIGHT) =r;
+  Real linear_combination (Real x) const;
+  string to_string () const;
+
+  bool contains (T r) const;
+  void negate ()
+  {
+    T r = -at (LEFT);
+    T l = -at (RIGHT);
+    at (LEFT) = l;
+    at (RIGHT) = r;
   }
-  
+
   void swap ()
   {
-    T t = elem (LEFT);
-    elem (LEFT) = elem (RIGHT);
-    elem (RIGHT) = t;
+    T t = at (LEFT);
+    at (LEFT) = at (RIGHT);
+    at (RIGHT) = t;
   }
-};
 
+  static bool left_less (Interval_t<T> const &a, Interval_t<T> const &b)
+  {
+    return a[LEFT] < b[LEFT];
+  }
+};
 
 /**
-  inclusion ordering. Crash if not  comparable.
-  */
+   inclusion ordering. Crash if not  comparable.
+*/
 template<class T>
-int Interval__compare (const Interval_t<T>&,Interval_t<T> const&);
+int Interval__compare (const Interval_t<T> &, Interval_t<T> const &);
 
 /**
    Inclusion ordering.  return -2 if not comparable
- */
+*/
 template<class T>
 int
-_Interval__compare (const Interval_t<T>&a,Interval_t<T> const&b);
-
+_Interval__compare (const Interval_t<T> &a, Interval_t<T> const &b);
 
 /*
   INLINE
- */
+*/
 
 #include "compare.hh"
 
-TEMPLATE_INSTANTIATE_COMPARE (Interval_t<T>&, Interval__compare, template<class T>);
-
+TEMPLATE_INSTANTIATE_COMPARE (Interval_t<T> &, Interval__compare, template<class T>);
 
 template<class T>
 inline Interval_t<T>
-intersection (Interval_t<T> a, Interval_t<T> const&b)
+intersection (Interval_t<T> a, Interval_t<T> const &b)
 {
   a.intersect (b);
   return a;
-    
 }
 
 template<class T>
 inline
-Interval_t<T> operator + (T a,Interval_t<T> i)
+Interval_t<T> operator + (T a, Interval_t<T> i)
 {
   i += a;
   return i;
@@ -159,7 +190,7 @@ Interval_t<T> operator - (Interval_t<T> i, T a)
 
 template<class T>
 inline
-Interval_t<T> operator - (T a,Interval_t<T> i)
+Interval_t<T> operator - (T a, Interval_t<T> i)
 {
   i.negate ();
   i += a;
@@ -168,13 +199,14 @@ Interval_t<T> operator - (T a,Interval_t<T> i)
 
 template<class T>
 inline
-Interval_t<T> operator + (Interval_t<T> i,T a){
-  return a+i;
+Interval_t<T> operator + (Interval_t<T> i, T a)
+{
+  return a + i;
 }
 
 template<class T>
 inline
-Interval_t<T> operator * (T a,Interval_t<T> i)
+Interval_t<T> operator * (T a, Interval_t<T> i)
 {
   i *= a;
   return i;
@@ -182,11 +214,19 @@ Interval_t<T> operator * (T a,Interval_t<T> i)
 
 template<class T>
 inline
-Interval_t<T> operator * (Interval_t<T> i,T a){
-  return a*i;
+Interval_t<T> operator * (Interval_t<T> i, T a)
+{
+  return a * i;
+}
+
+template<class T>
+inline T
+Interval_t<T>::center () const
+{
+  assert (!is_empty ());
+  return (at (LEFT) + at (RIGHT)) / T (2);
 }
 
-// again? see flower-proto.hh
 typedef Interval_t<Real> Interval;
 typedef Interval_t<int> Slice;	// weird name