alpar@906: /* -*- C++ -*-
alpar@921:  * src/lemon/xy.h - Part of LEMON, a generic C++ optimization library
alpar@906:  *
alpar@1164:  * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
alpar@1359:  * (Egervary Research Group on Combinatorial Optimization, EGRES).
alpar@906:  *
alpar@906:  * Permission to use, modify and distribute this software is granted
alpar@906:  * provided that this copyright notice appears in all copies. For
alpar@906:  * precise terms see the accompanying LICENSE file.
alpar@906:  *
alpar@906:  * This software is provided "AS IS" with no warranty of any kind,
alpar@906:  * express or implied, and with no claim as to its suitability for any
alpar@906:  * purpose.
alpar@906:  *
alpar@906:  */
alpar@906: 
alpar@921: #ifndef LEMON_XY_H
alpar@921: #define LEMON_XY_H
athos@201: 
athos@201: #include <iostream>
athos@201: 
klao@491: ///\ingroup misc
alpar@249: ///\file
alpar@249: ///\brief A simple two dimensional vector and a bounding box implementation 
alpar@249: ///
alpar@921: /// The class \ref lemon::xy "xy" implements
alpar@249: ///a two dimensional vector with the usual
alpar@249: /// operations.
alpar@249: ///
alpar@921: /// The class \ref lemon::BoundingBox "BoundingBox" can be used to determine
alpar@921: /// the rectangular bounding box a set of \ref lemon::xy "xy"'s.
alpar@458: ///
alpar@458: ///\author Attila Bernath
alpar@249: 
alpar@249: 
alpar@921: namespace lemon {
alpar@431: 
alpar@431:   /// \addtogroup misc
alpar@431:   /// @{
alpar@431: 
alpar@1257:   /// A simple two dimensional vector (plainvector) implementation
alpar@242: 
alpar@1257:   /// A simple two dimensional vector (plainvector) implementation
alpar@458:   ///with the usual vector
alpar@458:   /// operators.
alpar@458:   ///
alpar@458:   ///\author Attila Bernath
athos@207:   template<typename T>
athos@207:     class xy {
athos@201: 
athos@207:     public:
athos@240: 
alpar@987:       typedef T Value;
alpar@964: 
athos@240:       T x,y;     
athos@207:       
alpar@1257:       ///Default constructor
alpar@1257:       xy() {}
athos@201: 
athos@240:       ///Constructing the instance from coordinates
athos@514:       xy(T a, T b) : x(a), y(b) { }
athos@201: 
athos@201: 
alpar@1049:       ///Conversion constructor
alpar@1049:       template<class TT> xy(const xy<TT> &p) : x(p.x), y(p.y) {}
alpar@1049: 
athos@207:       ///Gives back the square of the norm of the vector
alpar@1257:       T normSquare() const {
athos@240: 	return x*x+y*y;
athos@207:       };
athos@201:   
athos@207:       ///Increments the left hand side by u
alpar@1257:       xy<T>& operator +=(const xy<T>& u) {
athos@240: 	x += u.x;
athos@240: 	y += u.y;
athos@207: 	return *this;
athos@207:       };
athos@201:   
athos@207:       ///Decrements the left hand side by u
alpar@1257:       xy<T>& operator -=(const xy<T>& u) {
athos@240: 	x -= u.x;
athos@240: 	y -= u.y;
athos@207: 	return *this;
athos@207:       };
athos@201: 
athos@207:       ///Multiplying the left hand side with a scalar
alpar@1257:       xy<T>& operator *=(const T &u) {
athos@240: 	x *= u;
athos@240: 	y *= u;
athos@207: 	return *this;
athos@207:       };
athos@207: 
athos@207:       ///Dividing the left hand side by a scalar
alpar@1257:       xy<T>& operator /=(const T &u) {
athos@240: 	x /= u;
athos@240: 	y /= u;
athos@207: 	return *this;
athos@207:       };
athos@201:   
athos@207:       ///Returns the scalar product of two vectors
alpar@1257:       T operator *(const xy<T>& u) const {
athos@240: 	return x*u.x+y*u.y;
athos@207:       };
athos@201:   
athos@207:       ///Returns the sum of two vectors
athos@207:       xy<T> operator+(const xy<T> &u) const {
athos@207: 	xy<T> b=*this;
athos@207: 	return b+=u;
athos@207:       };
athos@201: 
alpar@1049:       ///Returns the neg of the vectors
alpar@1049:       xy<T> operator-() const {
alpar@1049: 	xy<T> b=*this;
alpar@1049: 	b.x=-b.x; b.y=-b.y;
alpar@1049: 	return b;
alpar@1049:       };
alpar@1049: 
athos@207:       ///Returns the difference of two vectors
athos@207:       xy<T> operator-(const xy<T> &u) const {
athos@207: 	xy<T> b=*this;
athos@207: 	return b-=u;
athos@207:       };
athos@201: 
athos@207:       ///Returns a vector multiplied by a scalar
athos@207:       xy<T> operator*(const T &u) const {
athos@207: 	xy<T> b=*this;
athos@207: 	return b*=u;
athos@207:       };
athos@201: 
athos@207:       ///Returns a vector divided by a scalar
athos@207:       xy<T> operator/(const T &u) const {
athos@207: 	xy<T> b=*this;
athos@207: 	return b/=u;
athos@207:       };
athos@201: 
athos@207:       ///Testing equality
alpar@1257:       bool operator==(const xy<T> &u) const {
athos@240: 	return (x==u.x) && (y==u.y);
athos@207:       };
athos@201: 
athos@207:       ///Testing inequality
alpar@1257:       bool operator!=(xy u) const {
athos@240: 	return  (x!=u.x) || (y!=u.y);
athos@207:       };
athos@201: 
athos@207:     };
athos@201: 
alpar@1071:   ///Returns a vector multiplied by a scalar
alpar@1083: 
alpar@1083:   ///Returns a vector multiplied by a scalar
alpar@1083:   ///\relates xy
alpar@1071:   template<typename T> xy<T> operator*(const T &u,const xy<T> &x) {
alpar@1071:     return x*u;
alpar@1071:   };
alpar@1071: 
alpar@814:   ///Read a plainvector from a stream
alpar@814: 
alpar@967:   ///Read a plainvector from a stream
alpar@814:   ///\relates xy
alpar@814:   ///
athos@207:   template<typename T>
athos@207:   inline
athos@207:   std::istream& operator>>(std::istream &is, xy<T> &z)
athos@207:   {
athos@240: 
athos@240:     is >> z.x >> z.y;
athos@207:     return is;
athos@207:   }
athos@201: 
alpar@814:   ///Write a plainvector to a stream
alpar@814: 
alpar@967:   ///Write a plainvector to a stream
alpar@814:   ///\relates xy
alpar@814:   ///
athos@207:   template<typename T>
athos@207:   inline
athos@207:   std::ostream& operator<<(std::ostream &os, xy<T> z)
athos@207:   {
athos@240:     os << "(" << z.x << ", " << z.y << ")";
athos@207:     return os;
athos@207:   }
athos@207: 
alpar@1202:   ///Rotate by 90 degrees
alpar@1202: 
alpar@1202:   ///Returns its parameter rotated by 90 degrees in positive direction.
alpar@1202:   ///\relates xy
alpar@1202:   ///
alpar@1202:   template<typename T>
alpar@1202:   inline xy<T> rot90(const xy<T> &z)
alpar@1202:   {
alpar@1202:     return xy<T>(-z.y,z.x);
alpar@1202:   }
alpar@1202: 
alpar@1202:   ///Rotate by 270 degrees
alpar@1202: 
alpar@1202:   ///Returns its parameter rotated by 90 degrees in negative direction.
alpar@1202:   ///\relates xy
alpar@1202:   ///
alpar@1202:   template<typename T>
alpar@1202:   inline xy<T> rot270(const xy<T> &z)
alpar@1202:   {
alpar@1202:     return xy<T>(z.y,-z.x);
alpar@1202:   }
alpar@1202: 
alpar@1202:   
athos@244: 
alpar@458:   /// A class to calculate or store the bounding box of plainvectors.
alpar@458: 
alpar@458:   /// A class to calculate or store the bounding box of plainvectors.
alpar@458:   ///
alpar@458:   ///\author Attila Bernath
athos@244:   template<typename T>
athos@244:     class BoundingBox {
athos@244:       xy<T> bottom_left, top_right;
athos@244:       bool _empty;
athos@244:     public:
athos@244:       
athos@244:       ///Default constructor: an empty bounding box
athos@244:       BoundingBox() { _empty = true; }
athos@244: 
athos@244:       ///Constructing the instance from one point
athos@244:       BoundingBox(xy<T> a) { bottom_left=top_right=a; _empty = false; }
athos@244: 
athos@244:       ///Is there any point added
athos@244:       bool empty() const {
athos@244: 	return _empty;
athos@244:       }
athos@244: 
athos@244:       ///Gives back the bottom left corner (if the bounding box is empty, then the return value is not defined) 
athos@244:       xy<T> bottomLeft() const {
athos@244: 	return bottom_left;
athos@244:       };
athos@244: 
athos@244:       ///Gives back the top right corner (if the bounding box is empty, then the return value is not defined) 
athos@244:       xy<T> topRight() const {
athos@244: 	return top_right;
athos@244:       };
athos@244: 
alpar@1045:       ///Gives back the bottom right corner (if the bounding box is empty, then the return value is not defined) 
alpar@1045:       xy<T> bottomRight() const {
alpar@1045: 	return xy<T>(top_right.x,bottom_left.y);
alpar@1045:       };
alpar@1045: 
alpar@1045:       ///Gives back the top left corner (if the bounding box is empty, then the return value is not defined) 
alpar@1045:       xy<T> topLeft() const {
alpar@1045: 	return xy<T>(bottom_left.x,top_right.y);
alpar@1045:       };
alpar@1045: 
alpar@1045:       ///Gives back the bottom of the box (if the bounding box is empty, then the return value is not defined) 
alpar@1045:       T bottom() const {
alpar@1045: 	return bottom_left.y;
alpar@1045:       };
alpar@1045: 
alpar@1045:       ///Gives back the top of the box (if the bounding box is empty, then the return value is not defined) 
alpar@1045:       T top() const {
alpar@1045: 	return top_right.y;
alpar@1045:       };
alpar@1045: 
alpar@1045:       ///Gives back the left side of the box (if the bounding box is empty, then the return value is not defined) 
alpar@1045:       T left() const {
alpar@1045: 	return bottom_left.x;
alpar@1045:       };
alpar@1045: 
alpar@1045:       ///Gives back the right side of the box (if the bounding box is empty, then the return value is not defined) 
alpar@1045:       T right() const {
alpar@1045: 	return top_right.x;
alpar@1045:       };
alpar@1045: 
alpar@1102:       ///Gives back the height of the box (if the bounding box is empty, then the return value is not defined) 
alpar@1102:       T height() const {
alpar@1102: 	return top_right.y-bottom_left.y;
alpar@1102:       };
alpar@1102: 
alpar@1102:       ///Gives back the width of the box (if the bounding box is empty, then the return value is not defined) 
alpar@1102:       T width() const {
alpar@1102: 	return top_right.x-bottom_left.x;
alpar@1102:       };
alpar@1102: 
athos@244:       ///Checks whether a point is inside a bounding box
athos@244:       bool inside(const xy<T>& u){
athos@244: 	if (_empty)
athos@244: 	  return false;
athos@244: 	else{
athos@244: 	  return ((u.x-bottom_left.x)*(top_right.x-u.x) >= 0 &&
athos@244: 		  (u.y-bottom_left.y)*(top_right.y-u.y) >= 0 );
athos@244: 	}
athos@244:       }
athos@244:   
athos@244:       ///Increments a bounding box with a point
athos@244:       BoundingBox& operator +=(const xy<T>& u){
athos@244: 	if (_empty){
athos@244: 	  bottom_left=top_right=u;
athos@244: 	  _empty = false;
athos@244: 	}
athos@244: 	else{
athos@244: 	  if (bottom_left.x > u.x) bottom_left.x = u.x;
athos@244: 	  if (bottom_left.y > u.y) bottom_left.y = u.y;
athos@244: 	  if (top_right.x < u.x) top_right.x = u.x;
athos@244: 	  if (top_right.y < u.y) top_right.y = u.y;
athos@244: 	}
athos@244: 	return *this;
athos@244:       };
athos@244:   
athos@244:       ///Sums a bounding box and a point
athos@244:       BoundingBox operator +(const xy<T>& u){
athos@244: 	BoundingBox b = *this;
athos@244: 	return b += u;
athos@244:       };
athos@244: 
athos@244:       ///Increments a bounding box with an other bounding box
athos@244:       BoundingBox& operator +=(const BoundingBox &u){
athos@244: 	if ( !u.empty() ){
athos@244: 	  *this += u.bottomLeft();
athos@244: 	  *this += u.topRight();
athos@244: 	}
athos@244: 	return *this;
athos@244:       };
athos@244:   
athos@244:       ///Sums two bounding boxes
athos@244:       BoundingBox operator +(const BoundingBox& u){
athos@244: 	BoundingBox b = *this;
athos@244: 	return b += u;
athos@244:       };
athos@244: 
athos@244:     };//class Boundingbox
athos@244: 
athos@244: 
alpar@1317:   ///Map of x-coordinates of an xy<>-map
alpar@1317: 
alpar@1317:   ///\ingroup maps
alpar@1317:   ///
alpar@1317:   template<class M>
alpar@1317:   class XMap 
alpar@1317:   {
alpar@1317:     M &_map;
alpar@1317:   public:
alpar@1317:     typedef typename M::Value::Value Value;
alpar@1317:     typedef typename M::Key Key;
alpar@1317:     ///\e
alpar@1317:     XMap(M &map) : _map(map) {}
alpar@1317:     Value operator[](Key k) const {return _map[k].x;}
alpar@1352:     void set(Key k,Value v) {_map.set(k,typename M::Value(v,_map[k].y));}
alpar@1317:   };
alpar@1317:     
alpar@1317:   ///Returns an \ref XMap class
alpar@1317: 
alpar@1317:   ///This function just returns an \ref XMap class.
alpar@1317:   ///
alpar@1317:   ///\ingroup maps
alpar@1317:   ///\relates XMap
alpar@1317:   template<class M> 
alpar@1317:   inline XMap<M> xMap(M &m) 
alpar@1317:   {
alpar@1317:     return XMap<M>(m);
alpar@1317:   }
alpar@1317: 
alpar@1317:   ///Constant (read only) version of \ref XMap
alpar@1317: 
alpar@1317:   ///\ingroup maps
alpar@1317:   ///
alpar@1317:   template<class M>
alpar@1317:   class ConstXMap 
alpar@1317:   {
alpar@1317:     const M &_map;
alpar@1317:   public:
alpar@1317:     typedef typename M::Value::Value Value;
alpar@1317:     typedef typename M::Key Key;
alpar@1317:     ///\e
alpar@1317:     ConstXMap(const M &map) : _map(map) {}
alpar@1317:     Value operator[](Key k) const {return _map[k].x;}
alpar@1317:   };
alpar@1317:     
alpar@1317:   ///Returns a \ref ConstXMap class
alpar@1317: 
alpar@1317:   ///This function just returns an \ref ConstXMap class.
alpar@1317:   ///
alpar@1317:   ///\ingroup maps
alpar@1317:   ///\relates ConstXMap
alpar@1317:   template<class M> 
alpar@1317:   inline ConstXMap<M> xMap(const M &m) 
alpar@1317:   {
alpar@1317:     return ConstXMap<M>(m);
alpar@1317:   }
alpar@1317: 
alpar@1317:   ///Map of y-coordinates of an xy<>-map
alpar@1317:     
alpar@1317:   ///\ingroup maps
alpar@1317:   ///
alpar@1317:   template<class M>
alpar@1317:   class YMap 
alpar@1317:   {
alpar@1317:     M &_map;
alpar@1317:   public:
alpar@1317:     typedef typename M::Value::Value Value;
alpar@1317:     typedef typename M::Key Key;
alpar@1317:     ///\e
alpar@1317:     YMap(M &map) : _map(map) {}
alpar@1317:     Value operator[](Key k) const {return _map[k].y;}
alpar@1352:     void set(Key k,Value v) {_map.set(k,typename M::Value(_map[k].x,v));}
alpar@1317:   };
alpar@1317: 
alpar@1317:   ///Returns an \ref YMap class
alpar@1317: 
alpar@1317:   ///This function just returns an \ref YMap class.
alpar@1317:   ///
alpar@1317:   ///\ingroup maps
alpar@1317:   ///\relates YMap
alpar@1317:   template<class M> 
alpar@1317:   inline YMap<M> yMap(M &m) 
alpar@1317:   {
alpar@1317:     return YMap<M>(m);
alpar@1317:   }
alpar@1317: 
alpar@1317:   ///Constant (read only) version of \ref YMap
alpar@1317: 
alpar@1317:   ///\ingroup maps
alpar@1317:   ///
alpar@1317:   template<class M>
alpar@1317:   class ConstYMap 
alpar@1317:   {
alpar@1317:     const M &_map;
alpar@1317:   public:
alpar@1317:     typedef typename M::Value::Value Value;
alpar@1317:     typedef typename M::Key Key;
alpar@1317:     ///\e
alpar@1317:     ConstYMap(const M &map) : _map(map) {}
alpar@1317:     Value operator[](Key k) const {return _map[k].y;}
alpar@1317:   };
alpar@1317:     
alpar@1317:   ///Returns a \ref ConstYMap class
alpar@1317: 
alpar@1317:   ///This function just returns an \ref ConstYMap class.
alpar@1317:   ///
alpar@1317:   ///\ingroup maps
alpar@1317:   ///\relates ConstYMap
alpar@1317:   template<class M> 
alpar@1317:   inline ConstYMap<M> yMap(const M &m) 
alpar@1317:   {
alpar@1317:     return ConstYMap<M>(m);
alpar@1317:   }
alpar@1317: 
alpar@1317: 
alpar@1352:   ///Map of the \ref xy::normSquare() "normSquare()" of an \ref xy "xy"-map
alpar@1352: 
alpar@1352:   ///Map of the \ref xy::normSquare() "normSquare()" of an \ref xy "xy"-map
alpar@1352:   ///\ingroup maps
alpar@1352:   ///
alpar@1352:   template<class M>
alpar@1352:   class NormSquareMap 
alpar@1352:   {
alpar@1352:     const M &_map;
alpar@1352:   public:
alpar@1352:     typedef typename M::Value::Value Value;
alpar@1352:     typedef typename M::Key Key;
alpar@1352:     ///\e
alpar@1352:     NormSquareMap(const M &map) : _map(map) {}
alpar@1352:     Value operator[](Key k) const {return _map[k].normSquare();}
alpar@1352:   };
alpar@1352:     
alpar@1352:   ///Returns a \ref NormSquareMap class
alpar@1352: 
alpar@1352:   ///This function just returns an \ref NormSquareMap class.
alpar@1352:   ///
alpar@1352:   ///\ingroup maps
alpar@1352:   ///\relates NormSquareMap
alpar@1352:   template<class M> 
alpar@1352:   inline NormSquareMap<M> normSquareMap(const M &m) 
alpar@1352:   {
alpar@1352:     return NormSquareMap<M>(m);
alpar@1352:   }
alpar@1352: 
alpar@431:   /// @}
athos@244: 
athos@244: 
alpar@921: } //namespace lemon
athos@201: 
alpar@921: #endif //LEMON_XY_H