box3.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.                                                         *
*                                                                           *
****************************************************************************/
#ifndef __VCGLIB_BOX3
#define __VCGLIB_BOX3

#include <vcg/space/point3.h>
#include <vcg/math/matrix44.h>
#include <vcg/space/line3.h>
#include <vcg/space/plane3.h>

namespace vcg {

template <class BoxScalarType>
class Box3
{
public:

    typedef BoxScalarType ScalarType;

  Point3<BoxScalarType> min;
    Point3<BoxScalarType> max;
    inline  Box3() { min.X()= 1;max.X()= -1;min.Y()= 1;max.Y()= -1;min.Z()= 1;max.Z()= -1;}
    inline  Box3( const Box3 & b ) { min=b.min; max=b.max; }
    inline  Box3( const Point3<BoxScalarType> & mi, const Point3<BoxScalarType> & ma ) { min = mi; max = ma; }
  inline Box3(const Point3<BoxScalarType> & center, const BoxScalarType & radius) {
    min = center-Point3<BoxScalarType>(radius,radius,radius);
    max = center+Point3<BoxScalarType>(radius,radius,radius);
  }
    inline ~Box3() { }
    inline bool operator == ( Box3<BoxScalarType> const & p ) const
    {
        return min==p.min && max==p.max;
    }
    inline bool operator != ( Box3<BoxScalarType> const & p ) const
    {
        return min!=p.min || max!=p.max;
    }
    void Offset( const BoxScalarType s )
    {
        Offset( Point3<BoxScalarType> (s,s,s));
    }
    void Offset( const Point3<BoxScalarType> & delta )
    {
        min -= delta;
        max += delta;
    }
    void Set( const Point3<BoxScalarType> & p )
    {
        min = max = p;
    }
    void SetNull()
    {
        min.X()= 1; max.X()= -1;
        min.Y()= 1; max.Y()= -1;
        min.Z()= 1; max.Z()= -1;
    }
    void Add( Box3<BoxScalarType> const & b )
    {
        if(b.IsNull()) return; // Adding a null bbox should do nothing
        if(IsNull()) *this=b;
        else
        {
            if(min.X() > b.min.X()) min.X() = b.min.X();
            if(min.Y() > b.min.Y()) min.Y() = b.min.Y();
            if(min.Z() > b.min.Z()) min.Z() = b.min.Z();

            if(max.X() < b.max.X()) max.X() = b.max.X();
            if(max.Y() < b.max.Y()) max.Y() = b.max.Y();
            if(max.Z() < b.max.Z()) max.Z() = b.max.Z();
        }
    }
    void Add( const Point3<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(min.Z() > p.Z()) min.Z() = p.Z();

            if(max.X() < p.X()) max.X() = p.X();
            if(max.Y() < p.Y()) max.Y() = p.Y();
            if(max.Z() < p.Z()) max.Z() = p.Z();
        }
    }

void Add( const Point3<BoxScalarType> & p, const BoxScalarType radius )
{
    if(IsNull()) Set(p);
    else
    {
      min.X() = std::min(min.X(),p.X()-radius);
      min.Y() = std::min(min.Y(),p.Y()-radius);
      min.Z() = std::min(min.Z(),p.Z()-radius);

      max.X() = std::max(max.X(),p.X()+radius);
      max.Y() = std::max(max.Y(),p.Y()+radius);
      max.Z() = std::max(max.Z(),p.Z()+radius);
    }
}
    // Aggiunge ad un box un altro box trasformato secondo la matrice m
    void Add( const Matrix44<BoxScalarType> &m, const Box3<BoxScalarType> & b )
    {
            const Point3<BoxScalarType> &mn= b.min;
            const Point3<BoxScalarType> &mx= b.max;
      Add(m*(Point3<BoxScalarType>(mn[0],mn[1],mn[2])));
            Add(m*(Point3<BoxScalarType>(mx[0],mn[1],mn[2])));
            Add(m*(Point3<BoxScalarType>(mn[0],mx[1],mn[2])));
            Add(m*(Point3<BoxScalarType>(mx[0],mx[1],mn[2])));
            Add(m*(Point3<BoxScalarType>(mn[0],mn[1],mx[2])));
            Add(m*(Point3<BoxScalarType>(mx[0],mn[1],mx[2])));
            Add(m*(Point3<BoxScalarType>(mn[0],mx[1],mx[2])));
            Add(m*(Point3<BoxScalarType>(mx[0],mx[1],mx[2])));
    }
    void Intersect( const Box3<BoxScalarType> & b )
    {
        if(min.X() < b.min.X()) min.X() = b.min.X();
        if(min.Y() < b.min.Y()) min.Y() = b.min.Y();
        if(min.Z() < b.min.Z()) min.Z() = b.min.Z();

        if(max.X() > b.max.X()) max.X() = b.max.X();
        if(max.Y() > b.max.Y()) max.Y() = b.max.Y();
        if(max.Z() > b.max.Z()) max.Z() = b.max.Z();

        if(min.X()>max.X() || min.Y()>max.Y() || min.Z()>max.Z()) SetNull();
    }
    void Translate( const Point3<BoxScalarType> & p )
    {
        min += p;
        max += p;
    }
    bool IsIn( Point3<BoxScalarType> const & p ) const
    {
        return (
            min.X() <= p.X() && p.X() <= max.X() &&
            min.Y() <= p.Y() && p.Y() <= max.Y() &&
            min.Z() <= p.Z() && p.Z() <= max.Z()
        );
    }
    bool IsInEx( Point3<BoxScalarType> const & p ) const
    {
        return (
            min.X() <= p.X() && p.X() < max.X() &&
            min.Y() <= p.Y() && p.Y() < max.Y() &&
            min.Z() <= p.Z() && p.Z() < max.Z()
        );
    }
    /* old version
    bool Collide(Box3<BoxScalarType> const &b)
    {
        Box3<BoxScalarType> bb=*this;
        bb.Intersect(b);
        return bb.IsValid();
    }
    */
    bool Collide(Box3<BoxScalarType> const &b) const
    {
        return b.min.X()<max.X() && b.max.X()>min.X() &&
               b.min.Y()<max.Y() && b.max.Y()>min.Y() &&
               b.min.Z()<max.Z() && b.max.Z()>min.Z() ;
    }
    bool IsNull() const { return min.X()>max.X() || min.Y()>max.Y() || min.Z()>max.Z(); }
    bool IsEmpty() const { return min==max; }
    BoxScalarType Diag() const
    {
        return Distance(min,max);
    }
    BoxScalarType SquaredDiag() const
    {
        return SquaredDistance(min,max);
    }
    Point3<BoxScalarType> Center() const
    {
        return (min+max)/2;
    }
    Point3<BoxScalarType> Dim() const
    {
        return (max-min);
    }
    Point3<BoxScalarType> LocalToGlobal(Point3<BoxScalarType> const & p) const{
        return Point3<BoxScalarType>(
            min[0] + p[0]*(max[0]-min[0]),
            min[1] + p[1]*(max[1]-min[1]),
            min[2] + p[2]*(max[2]-min[2]));
    }
    Point3<BoxScalarType> GlobalToLocal(Point3<BoxScalarType> const & p) const{
        return Point3<BoxScalarType>(
          (p[0]-min[0])/(max[0]-min[0]),
          (p[1]-min[1])/(max[1]-min[1]),
          (p[2]-min[2])/(max[2]-min[2])
            );
    }
    BoxScalarType Volume() const
    {
        return (max.X()-min.X())*(max.Y()-min.Y())*(max.Z()-min.Z());
    }
    inline BoxScalarType DimX() const { return max.X()-min.X();}
    inline BoxScalarType DimY() const { return max.Y()-min.Y();}
    inline BoxScalarType DimZ() const { return max.Z()-min.Z();}
    inline unsigned char MaxDim() const {
        int i;
        Point3<BoxScalarType> diag = max-min;
        if(diag[0]>diag[1]) i=0; else i=1;
        return (diag[i]>diag[2])? i: 2;
    }
    inline unsigned char MinDim() const {
        int i;
        Point3<BoxScalarType> diag =  max-min;
        if(diag[0]<diag[1]) i=0; else i=1;
        return (diag[i]<diag[2])? i: 2;
    }

    template <class Q>
    inline void Import( const Box3<Q> & b )
    {
        min.Import(b.min);
        max.Import(b.max);
    }

    template <class Q>
    static inline Box3 Construct( const Box3<Q> & b )
    {
    return Box3(Point3<BoxScalarType>::Construct(b.min),Point3<BoxScalarType>::Construct(b.max));
    }

    Point3<BoxScalarType> P(const int & i) const {
            return Point3<BoxScalarType>(
                min[0]+ (i%2) * DimX(),
                min[1]+ ((i / 2)%2) * DimY(),
                min[2]+ (i>3)* DimZ());
    }
}; // end class definition

template <class T> Box3<T> Point3<T>::GetBBox(Box3<T> &bb) const {
 bb.Set( *this );
}


typedef Box3<short>  Box3s;
typedef Box3<int>        Box3i;
typedef Box3<float>  Box3f;
typedef Box3<double> Box3d;


} // end namespace
#endif