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vcglib/vcg/space/box2.h

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/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2004 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* 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. *
* *
* This program 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 (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
/****************************************************************************
History
$Log: not supported by cvs2svn $
Revision 1.8 2007/07/02 10:01:00 corsini
fix area
Revision 1.7 2006/10/07 16:50:26 m_di_benedetto
Added Dim() method.
Revision 1.6 2005/06/14 13:46:20 ponchio
Minibug: Box2f -> Box2 in the template.
Revision 1.5 2005/05/06 14:02:37 croccia
replaced all the occurences of min.v[0] with min.X(), max.v[0] with max.X() etc.
Revision 1.3 2005/05/05 10:20:24 croccia
changed #include <vcg/space/point3> to #include <vcg/space/point2.h>
croccia
Revision 1.2 2004/03/10 21:38:39 cignoni
Written some documentation and added to the space module
Revision 1.1 2004/02/15 23:34:04 cignoni
Initial commit
****************************************************************************/
#ifndef __VCGLIB_BOX2
#define __VCGLIB_BOX2
#include <assert.h>
#include <vcg/math/base.h>
#include <vcg/space/point2.h>
namespace vcg {
/** \addtogroup space */
/*@{*/
/**
Templated class for a 2D bounding box. It is stored just as two Point2
@param BoxScalarType (Template Parameter) Specifies the scalar field.
*/
template <class BoxScalarType>
class Box2
{
public:
/// The scalar type
typedef BoxScalarType ScalarType;
/// min coordinate point
Point2<BoxScalarType> min;
/// max coordinate point
Point2<BoxScalarType> max;
/// Standard constructor
inline Box2() { min.X()= 1; max.X()= -1; min.Y()= 1; max.Y()= -1; }
/// Copy constructor
inline Box2( const Box2 & b ) { min=b.min; max=b.max; }
/// Distructor
inline ~Box2() { }
/// Operator to compare two bounding box
inline bool operator == ( Box2 const & p ) const
{
return min==p.min && max==p.max;
}
/// Initializing the bounding box with a point
void Set( const Point2<BoxScalarType> & p )
{
min = max = p;
}
// Initializing with the values
inline void Set( BoxScalarType minx, BoxScalarType miny, BoxScalarType maxx, BoxScalarType maxy )
{
min[0] = minx;
min[1] = miny;
max[0] = maxx;
max[1] = maxy;
}
/// Set the bounding box to a null value
void SetNull()
{
min.X()= 1; max.X()= -1; min.Y()= 1; max.Y()= -1;
}
/** Function to add two bounding box
@param b Il bounding box che si vuole aggiungere
*/
void Add( Box2 const & b )
{
if(IsNull())
{
min=b.min;
max=b.max;
}
else
{
if(min.X() > b.min.X()) min.X() = b.min.X();
if(min.Y() > b.min.Y()) min.Y() = b.min.Y();
if(max.X() < b.max.X()) max.X() = b.max.X();
if(max.Y() < b.max.Y()) max.Y() = b.max.Y();
}
}
/** Funzione per aggiungere un punto al bounding box. Il bounding box viene modificato se il punto
cade fuori da esso.
@param p The point 2D
*/
void Add( const Point2<BoxScalarType> & p )
{
if(IsNull()) Set(p);
else
{
if(min.X() > p.X()) min.X() = p.X();
if(min.Y() > p.Y()) min.Y() = p.Y();
if(max.X() < p.X()) max.X() = p.X();
if(max.Y() < p.Y()) max.Y() = p.Y();
}
}
/** Varia le dimensioni del bounding box scalandole rispetto al parametro scalare.
@param s Valore scalare che indica di quanto deve variare il bounding box
*/
void Offset(const BoxScalarType s)
{
Offset(Point2<BoxScalarType>(s, s));
}
/** Varia le dimensioni del bounding box del valore fornito attraverso il parametro.
@param delta Point in 3D space
*/
void Offset(const Point2<BoxScalarType> & delta)
{
min -= delta;
max += delta;
}
/** Calcola l'intersezione tra due bounding box. Al bounding box viene assegnato il valore risultante.
@param b Il bounding box con il quale si vuole effettuare l'intersezione
*/
void Intersect( const Box2 & b )
{
if(min.X() < b.min.X()) min.X() = b.min.X();
if(min.Y() < b.min.Y()) min.Y() = b.min.Y();
if(max.X() > b.max.X()) max.X() = b.max.X();
if(max.Y() > b.max.Y()) max.Y() = b.max.Y();
if(min.X()>max.X() || min.Y()>max.Y()) SetNull();
}
/** Trasla il bounding box di un valore definito dal parametro.
@param p Il bounding box trasla sulla x e sulla y in base alle coordinate del parametro
*/
void Translate( const Point2<BoxScalarType> & p )
{
min += p;
max += p;
}
/** Verifica se un punto appartiene ad un bounding box.
@param p The point 2D
@return True se p appartiene al bounding box, false altrimenti
*/
bool IsIn( Point2<BoxScalarType> const & p ) const
{
return (
min.X() <= p.X() && p.X() <= max.X() &&
min.Y() <= p.Y() && p.Y() <= max.Y()
);
}
/** Verifica se un punto appartiene ad un bounding box aperto sul max.
@param p The point 2D
@return True se p appartiene al bounding box, false altrimenti
*/
bool IsInEx( Point2<BoxScalarType> const & p ) const
{
return (
min.X() <= p.X() && p.X() < max.X() &&
min.Y() <= p.Y() && p.Y() < max.Y()
);
}
/** Verifica se due bounding box collidono cioe' se hanno una intersezione non vuota. Per esempio
due bounding box adiacenti non collidono.
@param b A bounding box
@return True se collidoo, false altrimenti
*/
bool Collide( Box2 const &b )
{
Box2 bb=*this;
bb.Intersect(b);
return bb.IsValid();
}
/** Controlla se il bounding box e' nullo.
@return True se il bounding box e' nullo, false altrimenti
*/
inline bool IsNull() const { return min.X()>max.X() || min.Y()>max.Y(); }
/** Controlla se il bounding box e' consistente.
@return True se il bounding box e' consistente, false altrimenti
*/
inline bool IsValid() const { return min.X()<max.X() && min.Y()<max.Y(); }
/** Controlla se il bounding box e' vuoto.
@return True se il bounding box e' vuoto, false altrimenti
*/
inline bool IsEmpty() const { return min==max; }
/// Restituisce la lunghezza della diagonale del bounding box.
BoxScalarType Diag() const
{
return Distance(min,max);
}
/// Calcola il centro del bounding box.
Point2<BoxScalarType> Center() const
{
return (min+max)/2;
}
/// Calcola l'area del Bounding box.
inline BoxScalarType Area() const
{
return (max[0]-min[0])*(max[1]-min[1]);
}
/// Calcola la dimensione del bounding box sulla x.
inline BoxScalarType DimX() const { return max.X()-min.X(); }
/// Calcola la dimensione del bounding box sulla y.
inline BoxScalarType DimY() const { return max.Y()-min.Y(); }
/// Calcola la dimensione del bounding box.
inline Point2<BoxScalarType> Dim() const { return max-min; }
inline void Normalize( Point2<BoxScalarType> & p )
{
p -= min;
p[0] /= max[0]-min[0];
p[1] /= max[1]-min[1];
}
}; // end class definition
template <class ScalarType>
ScalarType DistancePoint2Box2(const Point2<ScalarType> &test,
const Box2<ScalarType> &bbox)
{
///test possible position respect to bounding box
if (!bbox.IsIn(test)){
if ((test.X()<=bbox.min.X())&&(test.Y()<=bbox.min.Y()))
return ((test-bbox.min).Norm());
else
if ((test.X()>=bbox.min.X())&&
(test.X()<=bbox.max.X())&&
(test.Y()<=bbox.min.Y()))
return (bbox.min.Y()-test.Y());
else
if ((test.X()>=bbox.max.X())&&
(test.Y()<=bbox.min.Y()))
return ((test-vcg::Point2<ScalarType>(bbox.max.X(),bbox.min.Y())).Norm());
else
if ((test.Y()>=bbox.min.Y())&&
(test.Y()<=bbox.max.Y())&&
(test.X()>=bbox.max.X()))
return (test.X()-bbox.max.X());
else
if ((test.X()>=bbox.max.X())&&(test.Y()>=bbox.max.Y()))
return ((test-bbox.max).Norm());
else
if ((test.X()>=bbox.min.X())&&
(test.X()<=bbox.max.X())&&
(test.Y()>=bbox.max.Y()))
return (test.Y()-bbox.max.Y());
else
if ((test.X()<=bbox.min.X())&&
(test.Y()>=bbox.max.Y()))
return ((test-vcg::Point2<ScalarType>(bbox.min.X(),bbox.max.Y())).Norm());
else
if ((test.X()<=bbox.min.X())&&
(test.Y()<=bbox.max.Y())&&
(test.Y()>=bbox.min.Y()))
return (bbox.min.X()-test.X());
}
else
{
//return minimum distance
ScalarType dx=std::min<ScalarType>(fabs(test.X()-bbox.min.X()),fabs(bbox.max.X()-test.X()));
ScalarType dy=std::min<ScalarType>(fabs(test.Y()-bbox.min.Y()),fabs(bbox.max.Y()-test.Y()));
return(std::min<ScalarType>(dx,dy));
}
}
/// Specificazione di box of short
typedef Box2<short> Box2s;
/// Specificazione di box of int
typedef Box2<int> Box2i;
/// Specificazione di box of float
typedef Box2<float> Box2f;
/// Specificazione di box of double
typedef Box2<double> Box2d;
/*@}*/
} // end namespace
#endif
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