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 1.1 2004/02/15 23:34:04 cignoni
Initial commit
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****************************************************************************/
#ifndef __VCGLIB_BOX2
#define __VCGLIB_BOX2
#include <assert.h>
#include <vcg/math/base.h>
#include <vcg/space/point3>
namespace vcg {
/** \addtogroup space */
/*@{*/
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/**
Templated class for a 2D bounding box. It is stored just as two Point2
@param BoxScalarType (Template Parameter) Specifies the scalar field.
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*/
template <class BoxScalarType>
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class Box2
{
public:
/// The scalar type
typedef BoxScalarType ScalarType;
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/// min coordinate point
Point2<BoxScalarType> min;
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/// max coordinate point
Point2<BoxScalarType> max;
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/// 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 )
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{
min = max = p;
}
// Initializing with the values
inline void Set( BoxScalarType minx, BoxScalarType miny, BoxScalarType maxx, BoxScalarType maxy )
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{
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;
}
esle
{
if(min.v[0] > b.min.v[0]) min.v[0] = b.min.v[0];
if(min.v[1] > b.min.v[1]) min.v[1] = b.min.v[1];
if(max.v[0] < b.max.v[0]) max.v[0] = b.max.v[0];
if(max.v[1] < b.max.v[1]) max.v[1] = b.max.v[1];
}
}
/** 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 )
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{
if(IsNull()) Set(p);
else
{
if(min.v[0] > p.v[0]) min.v[0] = p.v[0];
if(min.v[1] > p.v[1]) min.v[1] = p.v[1];
if(max.v[0] < p.v[0]) max.v[0] = p.v[0];
if(max.v[1] < p.v[1]) max.v[1] = p.v[1];
}
}
/** 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.v[0] < b.min.v[0]) min.v[0] = b.min.v[0];
if(min.v[1] < b.min.v[1]) min.v[1] = b.min.v[1];
if(max.v[0] > b.max.v[0]) max.v[0] = b.max.v[0];
if(max.v[1] > b.max.v[1]) max.v[1] = b.max.v[1];
if(min.v[0]>max.v[0] || min.v[1]>max.v[1]) 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 )
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{
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
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{
return (
min.v[0] <= p.v[0] && p.v[0] <= max.v[0] &&
min.v[1] <= p.v[1] && p.v[1] <= max.v[1]
);
}
/** 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
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{
return (
min.v[0] <= p.v[0] && p.v[0] < max.v[0] &&
min.v[1] <= p.v[1] && p.v[1] < max.v[1]
);
}
/** 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 )
{
Box2f 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.v[0]>max.v[0] || min.v[1]>max.v[1]; }
/** Controlla se il bounding box e' consistente.
@return True se il bounding box e' consistente, false altrimenti
*/
inline bool IsValid() const { return min.v[0]<max.v[0] && min.v[1]<max.v[1]; }
/** 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
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{
return Distance(min,max);
}
/// Calcola il centro del bounding box.
Point2<BoxScalarType> Center() const
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{
return (min+max)/2;
}
/// Calcola l'area del Bounding box.
inline BoxScalarType Area() const
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{
return (max.v[0]-min.v[0])*(max.v[1]-min.v[1]);
}
/// Calcola la dimensione del bounding box sulla x.
inline BoxScalarType DimX() const { return max.v[0]-min.v[0]; }
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/// Calcola la dimensione del bounding box sulla y.
inline BoxScalarType DimY() const { return max.v[1]-min.v[1]; }
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inline void Normalize( Point2<BoxScalarType> & p )
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{
p -= min;
p[0] /= max[0]-min[0];
p[1] /= max[1]-min[1];
}
}; // end class definition
/// 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;
/*@}*/
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} // end namespace
#endif