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/***************************************************************************
bbox.hh - Bounding boxes
-------------------
begin : Sun Jun 11 2000
copyright : (C) 2000 by Erik Schnetter
email : schnetter@astro.psu.edu
$Header: /home/eschnett/C/carpet/Carpet/Carpet/CarpetLib/src/bbox.hh,v 1.10 2002/05/05 22:16:58 schnetter Exp $
***************************************************************************/
/***************************************************************************
* *
* This program 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 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef BBOX_HH
#define BBOX_HH
#include <iostream>
#include "defs.hh"
#include "vect.hh"
using namespace std;
// Forward declaration
template<class T, int D> class bbox;
// Input/Output
template<class T, int D>
istream& operator>> (istream& is, bbox<T,D>& b);
template<class T, int D>
ostream& operator<< (ostream& os, const bbox<T,D>& b);
// Bounding box class
template<class T, int D>
class bbox {
// Fields
vect<T,D> _lower, _upper, _stride; // bounds are inclusive
public:
// Constructors
bbox ();
bbox (const bbox& b);
bbox& operator= (const bbox& b);
bbox (const vect<T,D>& lower, const vect<T,D>& upper,
const vect<T,D>& stride);
// Accessors
// (Don't return references; *this might be a temporary)
vect<T,D> lower () const { return _lower; }
vect<T,D> upper () const { return _upper; }
vect<T,D> stride () const { return _stride; }
vect<T,D> shape () const { return _upper - _lower + _stride; }
bool empty() const {
return any(lower()>upper());
}
T size () const;
T num_points () const;
// Queries
bool contains (const vect<T,D>& x) const;
// Operators
bool operator== (const bbox& b) const;
bool operator!= (const bbox& b) const;
bool operator< (const bbox& b) const;
bool operator> (const bbox& b) const;
bool operator<= (const bbox& b) const;
bool operator>= (const bbox& b) const;
// Intersection
bbox operator& (const bbox& b) const;
// Containment
bool is_contained_in (const bbox& b) const;
// Alignment check
bool is_aligned_with (const bbox& b) const;
// Expand the bbox a little by multiples of the stride
bbox expand (const vect<T,D>& lo, const vect<T,D>& hi) const;
// Find the smallest b-compatible box around *this
bbox expanded_for (const bbox& b) const;
// Find the largest b-compatible box inside *this
bbox contracted_for (const bbox& b) const;
// Smallest bbox containing both boxes
bbox expanded_containing (const bbox<T,D>& b) const;
// Iterators
class iterator {
protected:
const bbox& box;
vect<T,D> pos;
public:
iterator (const bbox& box, const vect<T,D>& pos);
const vect<T,D>& operator* () const { return pos; }
bool operator!= (const iterator& i) const;
iterator& operator++ ();
};
iterator begin () const;
iterator end () const;
// Input/Output
void input (istream& is);
void output (ostream& os) const;
};
// Input
template<class T,int D>
inline istream& operator>> (istream& is, bbox<T,D>& b) {
b.input(is);
return is;
}
// Output
template<class T,int D>
inline ostream& operator<< (ostream& os, const bbox<T,D>& b) {
b.output(os);
return os;
}
#endif // BBOX_HH
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