lemon/dim2.h
author Alpar Juttner <alpar@cs.elte.hu>
Sun, 12 Oct 2008 19:57:53 +0100
changeset 320 34e185734b42
parent 209 765619b7cbb2
child 241 92f046dd7f6c
permissions -rw-r--r--
AUTHORS file added
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/* -*- mode: C++; indent-tabs-mode: nil; -*-
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 *
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 * This file is a part of LEMON, a generic C++ optimization library.
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 *
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 * Copyright (C) 2003-2008
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 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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 * (Egervary Research Group on Combinatorial Optimization, EGRES).
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 *
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 * Permission to use, modify and distribute this software is granted
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 * provided that this copyright notice appears in all copies. For
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 * precise terms see the accompanying LICENSE file.
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 *
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 * This software is provided "AS IS" with no warranty of any kind,
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 * express or implied, and with no claim as to its suitability for any
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 * purpose.
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 *
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 */
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#ifndef LEMON_DIM2_H
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#define LEMON_DIM2_H
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#include <iostream>
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#include <lemon/core.h>
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///\ingroup misc
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///\file
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///\brief A simple two dimensional vector and a bounding box implementation
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///
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/// The class \ref lemon::dim2::Point "dim2::Point" implements
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/// a two dimensional vector with the usual operations.
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///
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/// The class \ref lemon::dim2::BoundingBox "dim2::BoundingBox"
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/// can be used to determine
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/// the rectangular bounding box of a set of
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/// \ref lemon::dim2::Point "dim2::Point"'s.
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namespace lemon {
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  ///Tools for handling two dimensional coordinates
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  ///This namespace is a storage of several
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  ///tools for handling two dimensional coordinates
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  namespace dim2 {
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  /// \addtogroup misc
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  /// @{
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  /// A simple two dimensional vector (plainvector) implementation
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  /// A simple two dimensional vector (plainvector) implementation
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  /// with the usual vector operations.
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  template<typename T>
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    class Point {
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    public:
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      typedef T Value;
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      ///First coordinate
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      T x;
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      ///Second coordinate
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      T y;
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      ///Default constructor
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      Point() {}
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      ///Construct an instance from coordinates
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      Point(T a, T b) : x(a), y(b) { }
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      ///Returns the dimension of the vector (i.e. returns 2).
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      ///The dimension of the vector.
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      ///This function always returns 2.
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      int size() const { return 2; }
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      ///Subscripting operator
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      ///\c p[0] is \c p.x and \c p[1] is \c p.y
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      ///
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      T& operator[](int idx) { return idx == 0 ? x : y; }
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      ///Const subscripting operator
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      ///\c p[0] is \c p.x and \c p[1] is \c p.y
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      ///
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      const T& operator[](int idx) const { return idx == 0 ? x : y; }
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      ///Conversion constructor
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      template<class TT> Point(const Point<TT> &p) : x(p.x), y(p.y) {}
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      ///Give back the square of the norm of the vector
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      T normSquare() const {
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        return x*x+y*y;
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      }
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      ///Increment the left hand side by \c u
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      Point<T>& operator +=(const Point<T>& u) {
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        x += u.x;
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        y += u.y;
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        return *this;
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      }
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      ///Decrement the left hand side by \c u
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      Point<T>& operator -=(const Point<T>& u) {
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        x -= u.x;
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        y -= u.y;
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        return *this;
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      }
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      ///Multiply the left hand side with a scalar
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      Point<T>& operator *=(const T &u) {
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        x *= u;
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        y *= u;
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        return *this;
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      }
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      ///Divide the left hand side by a scalar
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      Point<T>& operator /=(const T &u) {
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        x /= u;
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        y /= u;
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        return *this;
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      }
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      ///Return the scalar product of two vectors
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      T operator *(const Point<T>& u) const {
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        return x*u.x+y*u.y;
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      }
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      ///Return the sum of two vectors
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      Point<T> operator+(const Point<T> &u) const {
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        Point<T> b=*this;
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        return b+=u;
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      }
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      ///Return the negative of the vector
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      Point<T> operator-() const {
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        Point<T> b=*this;
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        b.x=-b.x; b.y=-b.y;
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        return b;
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      }
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      ///Return the difference of two vectors
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      Point<T> operator-(const Point<T> &u) const {
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        Point<T> b=*this;
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        return b-=u;
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      }
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      ///Return a vector multiplied by a scalar
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      Point<T> operator*(const T &u) const {
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        Point<T> b=*this;
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        return b*=u;
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      }
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      ///Return a vector divided by a scalar
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      Point<T> operator/(const T &u) const {
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        Point<T> b=*this;
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        return b/=u;
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      }
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      ///Test equality
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      bool operator==(const Point<T> &u) const {
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        return (x==u.x) && (y==u.y);
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      }
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      ///Test inequality
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      bool operator!=(Point u) const {
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        return  (x!=u.x) || (y!=u.y);
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      }
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    };
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  ///Return a Point
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  ///Return a Point.
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  ///\relates Point
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  template <typename T>
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  inline Point<T> makePoint(const T& x, const T& y) {
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    return Point<T>(x, y);
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  }
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  ///Return a vector multiplied by a scalar
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  ///Return a vector multiplied by a scalar.
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  ///\relates Point
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  template<typename T> Point<T> operator*(const T &u,const Point<T> &x) {
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    return x*u;
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  }
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  ///Read a plainvector from a stream
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  ///Read a plainvector from a stream.
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  ///\relates Point
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  ///
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  template<typename T>
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  inline std::istream& operator>>(std::istream &is, Point<T> &z) {
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    char c;
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    if (is >> c) {
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      if (c != '(') is.putback(c);
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    } else {
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      is.clear();
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    }
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    if (!(is >> z.x)) return is;
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    if (is >> c) {
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      if (c != ',') is.putback(c);
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    } else {
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      is.clear();
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    }
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    if (!(is >> z.y)) return is;
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    if (is >> c) {
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      if (c != ')') is.putback(c);
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    } else {
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      is.clear();
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    }
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    return is;
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  }
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  ///Write a plainvector to a stream
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  ///Write a plainvector to a stream.
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  ///\relates Point
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  ///
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  template<typename T>
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  inline std::ostream& operator<<(std::ostream &os, const Point<T>& z)
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  {
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    os << "(" << z.x << ", " << z.y << ")";
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    return os;
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  }
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  ///Rotate by 90 degrees
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  ///Returns the parameter rotated by 90 degrees in positive direction.
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  ///\relates Point
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  ///
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  template<typename T>
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  inline Point<T> rot90(const Point<T> &z)
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  {
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    return Point<T>(-z.y,z.x);
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  }
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  ///Rotate by 180 degrees
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  ///Returns the parameter rotated by 180 degrees.
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  ///\relates Point
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  ///
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  template<typename T>
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  inline Point<T> rot180(const Point<T> &z)
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  {
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    return Point<T>(-z.x,-z.y);
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  }
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  ///Rotate by 270 degrees
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  ///Returns the parameter rotated by 90 degrees in negative direction.
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  ///\relates Point
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  ///
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  template<typename T>
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  inline Point<T> rot270(const Point<T> &z)
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  {
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    return Point<T>(z.y,-z.x);
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  }
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  /// A class to calculate or store the bounding box of plainvectors.
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  /// A class to calculate or store the bounding box of plainvectors.
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  ///
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    template<typename T>
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    class BoundingBox {
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      Point<T> bottom_left, top_right;
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      bool _empty;
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    public:
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      ///Default constructor: creates an empty bounding box
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      BoundingBox() { _empty = true; }
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      ///Construct an instance from one point
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      BoundingBox(Point<T> a) { bottom_left=top_right=a; _empty = false; }
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      ///Construct an instance from two points
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      ///Construct an instance from two points.
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      ///\param a The bottom left corner.
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      ///\param b The top right corner.
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      ///\warning The coordinates of the bottom left corner must be no more
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      ///than those of the top right one.
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      BoundingBox(Point<T> a,Point<T> b)
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      {
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        bottom_left=a;
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        top_right=b;
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        _empty = false;
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      }
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      ///Construct an instance from four numbers
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      ///Construct an instance from four numbers.
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      ///\param l The left side of the box.
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      ///\param b The bottom of the box.
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      ///\param r The right side of the box.
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      ///\param t The top of the box.
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      ///\warning The left side must be no more than the right side and
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      ///bottom must be no more than the top.
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      BoundingBox(T l,T b,T r,T t)
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      {
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        bottom_left=Point<T>(l,b);
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        top_right=Point<T>(r,t);
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        _empty = false;
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      }
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      ///Return \c true if the bounding box is empty.
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      ///Return \c true if the bounding box is empty (i.e. return \c false
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      ///if at least one point was added to the box or the coordinates of
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      ///the box were set).
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      ///
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      ///The coordinates of an empty bounding box are not defined.
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      bool empty() const {
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        return _empty;
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      }
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      ///Make the BoundingBox empty
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      void clear() {
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        _empty=1;
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      }
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      ///Give back the bottom left corner of the box
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      ///Give back the bottom left corner of the box.
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      ///If the bounding box is empty, then the return value is not defined.
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      Point<T> bottomLeft() const {
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        return bottom_left;
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      }
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      ///Set the bottom left corner of the box
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      ///Set the bottom left corner of the box.
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      ///It should only be used for non-empty box.
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      void bottomLeft(Point<T> p) {
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        bottom_left = p;
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      }
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      ///Give back the top right corner of the box
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      ///Give back the top right corner of the box.
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      ///If the bounding box is empty, then the return value is not defined.
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      Point<T> topRight() const {
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        return top_right;
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      }
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      ///Set the top right corner of the box
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      ///Set the top right corner of the box.
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      ///It should only be used for non-empty box.
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      void topRight(Point<T> p) {
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        top_right = p;
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      }
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      ///Give back the bottom right corner of the box
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      ///Give back the bottom right corner of the box.
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      ///If the bounding box is empty, then the return value is not defined.
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      Point<T> bottomRight() const {
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        return Point<T>(top_right.x,bottom_left.y);
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      }
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      ///Set the bottom right corner of the box
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      ///Set the bottom right corner of the box.
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      ///It should only be used for non-empty box.
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      void bottomRight(Point<T> p) {
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        top_right.x = p.x;
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        bottom_left.y = p.y;
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      }
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      ///Give back the top left corner of the box
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      ///Give back the top left corner of the box.
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      ///If the bounding box is empty, then the return value is not defined.
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      Point<T> topLeft() const {
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        return Point<T>(bottom_left.x,top_right.y);
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      }
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      ///Set the top left corner of the box
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      ///Set the top left corner of the box.
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      ///It should only be used for non-empty box.
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      void topLeft(Point<T> p) {
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        top_right.y = p.y;
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        bottom_left.x = p.x;
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      }
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      ///Give back the bottom of the box
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      ///Give back the bottom of the box.
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      ///If the bounding box is empty, then the return value is not defined.
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      T bottom() const {
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        return bottom_left.y;
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      }
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      ///Set the bottom of the box
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      ///Set the bottom of the box.
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      ///It should only be used for non-empty box.
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      void bottom(T t) {
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        bottom_left.y = t;
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      }
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      ///Give back the top of the box
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      ///Give back the top of the box.
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      ///If the bounding box is empty, then the return value is not defined.
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      T top() const {
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        return top_right.y;
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      }
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      ///Set the top of the box
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      ///Set the top of the box.
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      ///It should only be used for non-empty box.
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      void top(T t) {
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        top_right.y = t;
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      }
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      ///Give back the left side of the box
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      ///Give back the left side of the box.
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      ///If the bounding box is empty, then the return value is not defined.
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      T left() const {
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        return bottom_left.x;
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      }
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      ///Set the left side of the box
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      ///Set the left side of the box.
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      ///It should only be used for non-empty box.
alpar@8
   436
      void left(T t) {
alpar@209
   437
        bottom_left.x = t;
alpar@8
   438
      }
alpar@8
   439
alpar@8
   440
      /// Give back the right side of the box
alpar@8
   441
alpar@8
   442
      /// Give back the right side of the box.
alpar@8
   443
      ///If the bounding box is empty, then the return value is not defined.
alpar@8
   444
      T right() const {
alpar@8
   445
        return top_right.x;
alpar@8
   446
      }
alpar@8
   447
alpar@8
   448
      ///Set the right side of the box
alpar@8
   449
alpar@8
   450
      ///Set the right side of the box.
kpeter@15
   451
      ///It should only be used for non-empty box.
alpar@8
   452
      void right(T t) {
alpar@209
   453
        top_right.x = t;
alpar@8
   454
      }
alpar@8
   455
alpar@8
   456
      ///Give back the height of the box
alpar@8
   457
alpar@8
   458
      ///Give back the height of the box.
alpar@8
   459
      ///If the bounding box is empty, then the return value is not defined.
alpar@8
   460
      T height() const {
alpar@8
   461
        return top_right.y-bottom_left.y;
alpar@8
   462
      }
alpar@8
   463
alpar@8
   464
      ///Give back the width of the box
alpar@8
   465
alpar@8
   466
      ///Give back the width of the box.
alpar@8
   467
      ///If the bounding box is empty, then the return value is not defined.
alpar@8
   468
      T width() const {
alpar@8
   469
        return top_right.x-bottom_left.x;
alpar@8
   470
      }
alpar@8
   471
alpar@8
   472
      ///Checks whether a point is inside a bounding box
kpeter@15
   473
      bool inside(const Point<T>& u) const {
alpar@8
   474
        if (_empty)
alpar@8
   475
          return false;
alpar@8
   476
        else{
alpar@8
   477
          return ((u.x-bottom_left.x)*(top_right.x-u.x) >= 0 &&
alpar@8
   478
              (u.y-bottom_left.y)*(top_right.y-u.y) >= 0 );
alpar@8
   479
        }
alpar@8
   480
      }
alpar@209
   481
alpar@8
   482
      ///Increments a bounding box with a point
kpeter@15
   483
kpeter@15
   484
      ///Increments a bounding box with a point.
kpeter@15
   485
      ///
alpar@8
   486
      BoundingBox& add(const Point<T>& u){
alpar@8
   487
        if (_empty){
alpar@8
   488
          bottom_left=top_right=u;
alpar@8
   489
          _empty = false;
alpar@8
   490
        }
alpar@8
   491
        else{
alpar@8
   492
          if (bottom_left.x > u.x) bottom_left.x = u.x;
alpar@8
   493
          if (bottom_left.y > u.y) bottom_left.y = u.y;
alpar@8
   494
          if (top_right.x < u.x) top_right.x = u.x;
alpar@8
   495
          if (top_right.y < u.y) top_right.y = u.y;
alpar@8
   496
        }
alpar@8
   497
        return *this;
alpar@8
   498
      }
alpar@209
   499
kpeter@15
   500
      ///Increments a bounding box to contain another bounding box
alpar@209
   501
kpeter@15
   502
      ///Increments a bounding box to contain another bounding box.
kpeter@15
   503
      ///
alpar@8
   504
      BoundingBox& add(const BoundingBox &u){
alpar@8
   505
        if ( !u.empty() ){
alpar@8
   506
          this->add(u.bottomLeft());
alpar@209
   507
          this->add(u.topRight());
alpar@8
   508
        }
alpar@8
   509
        return *this;
alpar@8
   510
      }
alpar@209
   511
alpar@8
   512
      ///Intersection of two bounding boxes
kpeter@15
   513
kpeter@15
   514
      ///Intersection of two bounding boxes.
kpeter@15
   515
      ///
kpeter@15
   516
      BoundingBox operator&(const BoundingBox& u) const {
alpar@8
   517
        BoundingBox b;
kpeter@15
   518
        if (this->_empty || u._empty) {
alpar@209
   519
          b._empty = true;
alpar@209
   520
        } else {
alpar@209
   521
          b.bottom_left.x = std::max(this->bottom_left.x,u.bottom_left.x);
alpar@209
   522
          b.bottom_left.y = std::max(this->bottom_left.y,u.bottom_left.y);
alpar@209
   523
          b.top_right.x = std::min(this->top_right.x,u.top_right.x);
alpar@209
   524
          b.top_right.y = std::min(this->top_right.y,u.top_right.y);
alpar@209
   525
          b._empty = b.bottom_left.x > b.top_right.x ||
alpar@209
   526
                     b.bottom_left.y > b.top_right.y;
alpar@209
   527
        }
alpar@8
   528
        return b;
alpar@8
   529
      }
alpar@8
   530
alpar@8
   531
    };//class Boundingbox
alpar@8
   532
alpar@8
   533
kpeter@49
   534
  ///Map of x-coordinates of a \ref Point "Point"-map
alpar@8
   535
alpar@8
   536
  ///\ingroup maps
kpeter@49
   537
  ///Map of x-coordinates of a \ref Point "Point"-map.
alpar@8
   538
  ///
alpar@8
   539
  template<class M>
alpar@209
   540
  class XMap
alpar@8
   541
  {
alpar@8
   542
    M& _map;
alpar@8
   543
  public:
alpar@8
   544
alpar@8
   545
    typedef typename M::Value::Value Value;
alpar@8
   546
    typedef typename M::Key Key;
alpar@8
   547
    ///\e
alpar@8
   548
    XMap(M& map) : _map(map) {}
alpar@8
   549
    Value operator[](Key k) const {return _map[k].x;}
alpar@8
   550
    void set(Key k,Value v) {_map.set(k,typename M::Value(v,_map[k].y));}
alpar@8
   551
  };
alpar@209
   552
alpar@8
   553
  ///Returns an \ref XMap class
alpar@8
   554
alpar@8
   555
  ///This function just returns an \ref XMap class.
alpar@8
   556
  ///
alpar@8
   557
  ///\ingroup maps
alpar@8
   558
  ///\relates XMap
alpar@209
   559
  template<class M>
alpar@209
   560
  inline XMap<M> xMap(M &m)
alpar@8
   561
  {
alpar@8
   562
    return XMap<M>(m);
alpar@8
   563
  }
alpar@8
   564
alpar@209
   565
  template<class M>
alpar@209
   566
  inline XMap<M> xMap(const M &m)
alpar@8
   567
  {
alpar@8
   568
    return XMap<M>(m);
alpar@8
   569
  }
alpar@8
   570
kpeter@49
   571
  ///Constant (read only) version of \ref XMap
alpar@8
   572
alpar@8
   573
  ///\ingroup maps
alpar@8
   574
  ///Constant (read only) version of \ref XMap
alpar@8
   575
  ///
alpar@8
   576
  template<class M>
alpar@209
   577
  class ConstXMap
alpar@8
   578
  {
alpar@8
   579
    const M& _map;
alpar@8
   580
  public:
alpar@8
   581
alpar@8
   582
    typedef typename M::Value::Value Value;
alpar@8
   583
    typedef typename M::Key Key;
alpar@8
   584
    ///\e
alpar@8
   585
    ConstXMap(const M &map) : _map(map) {}
alpar@8
   586
    Value operator[](Key k) const {return _map[k].x;}
alpar@8
   587
  };
alpar@209
   588
alpar@8
   589
  ///Returns a \ref ConstXMap class
alpar@8
   590
kpeter@15
   591
  ///This function just returns a \ref ConstXMap class.
alpar@8
   592
  ///
alpar@8
   593
  ///\ingroup maps
alpar@8
   594
  ///\relates ConstXMap
alpar@209
   595
  template<class M>
alpar@209
   596
  inline ConstXMap<M> xMap(const M &m)
alpar@8
   597
  {
alpar@8
   598
    return ConstXMap<M>(m);
alpar@8
   599
  }
alpar@8
   600
kpeter@49
   601
  ///Map of y-coordinates of a \ref Point "Point"-map
alpar@209
   602
alpar@8
   603
  ///\ingroup maps
kpeter@15
   604
  ///Map of y-coordinates of a \ref Point "Point"-map.
alpar@8
   605
  ///
alpar@8
   606
  template<class M>
alpar@209
   607
  class YMap
alpar@8
   608
  {
alpar@8
   609
    M& _map;
alpar@8
   610
  public:
alpar@8
   611
alpar@8
   612
    typedef typename M::Value::Value Value;
alpar@8
   613
    typedef typename M::Key Key;
alpar@8
   614
    ///\e
alpar@8
   615
    YMap(M& map) : _map(map) {}
alpar@8
   616
    Value operator[](Key k) const {return _map[k].y;}
alpar@8
   617
    void set(Key k,Value v) {_map.set(k,typename M::Value(_map[k].x,v));}
alpar@8
   618
  };
alpar@8
   619
kpeter@15
   620
  ///Returns a \ref YMap class
alpar@8
   621
kpeter@15
   622
  ///This function just returns a \ref YMap class.
alpar@8
   623
  ///
alpar@8
   624
  ///\ingroup maps
alpar@8
   625
  ///\relates YMap
alpar@209
   626
  template<class M>
alpar@209
   627
  inline YMap<M> yMap(M &m)
alpar@8
   628
  {
alpar@8
   629
    return YMap<M>(m);
alpar@8
   630
  }
alpar@8
   631
alpar@209
   632
  template<class M>
alpar@209
   633
  inline YMap<M> yMap(const M &m)
alpar@8
   634
  {
alpar@8
   635
    return YMap<M>(m);
alpar@8
   636
  }
alpar@8
   637
kpeter@49
   638
  ///Constant (read only) version of \ref YMap
alpar@8
   639
alpar@8
   640
  ///\ingroup maps
alpar@8
   641
  ///Constant (read only) version of \ref YMap
alpar@8
   642
  ///
alpar@8
   643
  template<class M>
alpar@209
   644
  class ConstYMap
alpar@8
   645
  {
alpar@8
   646
    const M& _map;
alpar@8
   647
  public:
alpar@8
   648
alpar@8
   649
    typedef typename M::Value::Value Value;
alpar@8
   650
    typedef typename M::Key Key;
alpar@8
   651
    ///\e
alpar@8
   652
    ConstYMap(const M &map) : _map(map) {}
alpar@8
   653
    Value operator[](Key k) const {return _map[k].y;}
alpar@8
   654
  };
alpar@209
   655
alpar@8
   656
  ///Returns a \ref ConstYMap class
alpar@8
   657
kpeter@15
   658
  ///This function just returns a \ref ConstYMap class.
alpar@8
   659
  ///
alpar@8
   660
  ///\ingroup maps
alpar@8
   661
  ///\relates ConstYMap
alpar@209
   662
  template<class M>
alpar@209
   663
  inline ConstYMap<M> yMap(const M &m)
alpar@8
   664
  {
alpar@8
   665
    return ConstYMap<M>(m);
alpar@8
   666
  }
alpar@8
   667
alpar@8
   668
kpeter@49
   669
  ///\brief Map of the \ref Point::normSquare() "normSquare()"
kpeter@49
   670
  ///of a \ref Point "Point"-map
kpeter@49
   671
  ///
kpeter@49
   672
  ///Map of the \ref Point::normSquare() "normSquare()"
kpeter@49
   673
  ///of a \ref Point "Point"-map.
kpeter@49
   674
  ///\ingroup maps
alpar@8
   675
  template<class M>
alpar@209
   676
  class NormSquareMap
alpar@8
   677
  {
alpar@8
   678
    const M& _map;
alpar@8
   679
  public:
alpar@8
   680
alpar@8
   681
    typedef typename M::Value::Value Value;
alpar@8
   682
    typedef typename M::Key Key;
alpar@8
   683
    ///\e
alpar@8
   684
    NormSquareMap(const M &map) : _map(map) {}
alpar@8
   685
    Value operator[](Key k) const {return _map[k].normSquare();}
alpar@8
   686
  };
alpar@209
   687
alpar@8
   688
  ///Returns a \ref NormSquareMap class
alpar@8
   689
kpeter@15
   690
  ///This function just returns a \ref NormSquareMap class.
alpar@8
   691
  ///
alpar@8
   692
  ///\ingroup maps
alpar@8
   693
  ///\relates NormSquareMap
alpar@209
   694
  template<class M>
alpar@209
   695
  inline NormSquareMap<M> normSquareMap(const M &m)
alpar@8
   696
  {
alpar@8
   697
    return NormSquareMap<M>(m);
alpar@8
   698
  }
alpar@8
   699
alpar@8
   700
  /// @}
alpar@8
   701
alpar@8
   702
  } //namespce dim2
alpar@209
   703
alpar@8
   704
} //namespace lemon
alpar@8
   705
alpar@8
   706
#endif //LEMON_DIM2_H