219 lines
7.0 KiB
C++
219 lines
7.0 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004-2016 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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#ifndef __VCGLIB_GRID_UTIL_2D
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#define __VCGLIB_GRID_UTIL_2D
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#include<vcg/space/index/base2d.h>
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#include<vcg/space/box2.h>
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#ifndef WIN32
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#define __int64 long long
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#define __cdecl
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#endif
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namespace vcg {
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/** BasicGrid2D
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Basic Class abstracting a gridded structure in a 3d space;
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Usueful for having coherent float to integer conversion in a unique place:
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Some Notes:
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- bbox is the real occupation of the box in the space;
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- siz is the number of cells for each side
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OBJTYPE: Type of the indexed objects.
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SCALARTYPE: Scalars type for structure's internal data (may differ from
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object's scalar type).
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*/
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template <class SCALARTYPE>
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class BasicGrid2D
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{
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public:
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typedef SCALARTYPE ScalarType;
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typedef Box2<ScalarType> Box2x;
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typedef Point2<ScalarType> CoordType;
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typedef BasicGrid2D<SCALARTYPE> GridType;
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Box2x bbox;
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CoordType dim; /// Spatial Dimention (edge legth) of the bounding box
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Point2i siz; /// Number of cells forming the grid
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CoordType voxel; /// Dimensions of a single cell
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/*
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Derives the right values of Dim and voxel starting
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from the current values of siz and bbox
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*/
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void ComputeDimAndVoxel()
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{
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this->dim = this->bbox.max - this->bbox.min;
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this->voxel[0] = this->dim[0]/this->siz[0];
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this->voxel[1] = this->dim[1]/this->siz[1];
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}
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/* Given a 3D point, returns the coordinates of the cell where the point is
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* @param p is a 3D point
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* @return integer coordinates of the cell
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*/
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inline Point2i GridP( const Point2<ScalarType> & p ) const
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{
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Point2i pi;
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PToIP(p, pi);
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return pi;
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}
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/* Given a 3D point p, returns the index of the corresponding cell
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* @param p is a 3D point in the space
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* @return integer coordinates pi of the cell
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*/
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inline void PToIP(const CoordType & p, Point2i &pi ) const
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{
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CoordType t = p - bbox.min;
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pi[0] = int( t[0] / voxel[0] );
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pi[1] = int( t[1] / voxel[1] );
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}
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/* Given a cell index return the lower corner of the cell
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* @param integer coordinates pi of the cell
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* @return p is a 3D point representing the lower corner of the cell
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*/
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inline void IPiToPf(const Point2i & pi, CoordType &p ) const
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{
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p[0] = ((ScalarType)pi[0])*voxel[0];
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p[1] = ((ScalarType)pi[1])*voxel[1];
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p += bbox.min;
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}
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/* Given a cell index return the corresponding box
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* @param integer coordinates pi of the cell
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* @return b is the corresponding box in <ScalarType> coordinates
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*/
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inline void IPiToBox(const Point2i & pi, Box2x & b ) const
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{
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CoordType p;
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p[0] = ((ScalarType)pi[0])*voxel[0];
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p[1] = ((ScalarType)pi[1])*voxel[1];
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p += bbox.min;
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b.min = p;
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b.max = (p + voxel);
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}
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/* Given a cell index return the center of the cell itself
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* @param integer coordinates pi of the cell
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* @return b is the corresponding box in <ScalarType> coordinates
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*/inline void IPiToBoxCenter(const Point2i & pi, CoordType & c ) const
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{
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CoordType p;
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IPiToPf(pi,p);
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c = p + voxel/ScalarType(2.0);
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}
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// Same of IPiToPf but for the case that you just want to transform
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// from a space to the other.
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inline void IPfToPf(const CoordType & pi, CoordType &p ) const
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{
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p[0] = ((ScalarType)pi[0])*voxel[0];
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p[1] = ((ScalarType)pi[1])*voxel[1];
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p += bbox.min;
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}
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/* Given a cell in <ScalarType> coordinates, compute the corresponding cell in integer coordinates
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* @param b is the cell in <ScalarType> coordinates
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* @return ib is the correspondent box in integer coordinates
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*/
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inline void BoxToIBox( const Box2x & b, Box2i & ib ) const
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{
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PToIP(b.min, ib.min);
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PToIP(b.max, ib.max);
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//assert(ib.max[0]>=0 && ib.max[1]>=0 && ib.max[2]>=0);
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}
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/* Given a cell in integer coordinates, compute the corresponding cell in <ScalarType> coordinates
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* @param ib is the cell in integer coordinates
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* @return b is the correspondent box in <ScalarType> coordinates
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*/
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/// Dato un box in voxel ritorna gli estremi del box reale
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void IBoxToBox( const Box2i & ib, Box2x & b ) const
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{
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IPiToPf(ib.min,b.min);
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IPiToPf(ib.max+Point2i(1,1),b.max);
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}
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};
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template<class scalar_type>
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void BestDim2D( const Box2<scalar_type> box, const scalar_type voxel_size, Point2i & dim )
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{
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Point2<scalar_type> box_size = box.max-box.min;
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__int64 elem_num = (__int64)(box_size[0]/voxel_size +0.5) *( __int64)(box_size[1]/voxel_size +0.5);
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BestDim2D(elem_num,box_size,dim);
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}
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/** Calcolo dimensioni griglia.
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Calcola la dimensione della griglia in funzione
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della ratio del bounding box e del numero di elementi
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*/
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template<class scalar_type>
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void BestDim2D( const __int64 elems, const Point2<scalar_type> & size, Point2i & dim )
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{
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const __int64 mincells = 1; // Numero minimo di celle
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const double GFactor = 1; // GridEntry = NumElem*GFactor
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double diag = size.Norm(); // Diagonale del box
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double eps = diag*1e-4; // Fattore di tolleranza
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assert(elems>0);
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assert(size[0]>=0.0);
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assert(size[1]>=0.0);
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__int64 ncell = (__int64)(elems*GFactor); // Calcolo numero di voxel
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if(ncell<mincells)
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ncell = mincells;
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dim[0] = 1;
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dim[1] = 1;
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if ((size[0]>eps)&&(size[1]>eps))
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{
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scalar_type Area=size[0]*size[1];
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double k = pow((double)(ncell/Area),double(1.0/2.f));
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dim[0] = int(size[0] * k);
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dim[1] = int(size[1] * k);
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}
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else
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{
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if(size[0]>eps)
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dim[0] = int(ncell);
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else
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dim[1] = int(ncell);
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}
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dim[0] = std::max(dim[0],1);
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dim[1] = std::max(dim[1],1);
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}
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}///end namespace
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#endif
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