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/*
//
// Copyright 1997-2009 Torsten Rohlfing
//
// Copyright 2004-2012 SRI International
//
// This file is part of the Computational Morphometry Toolkit.
//
// http://www.nitrc.org/projects/cmtk/
//
// The Computational Morphometry Toolkit 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 3 of
// the License, or (at your option) any later version.
//
// The Computational Morphometry Toolkit 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 for more details.
//
// You should have received a copy of the GNU General Public License along
// with the Computational Morphometry Toolkit. If not, see
// <http://www.gnu.org/licenses/>.
//
// $Revision: 5436 $
//
// $LastChangedDate: 2018-12-10 19:01:20 -0800 (Mon, 10 Dec 2018) $
//
// $LastChangedBy: torstenrohlfing $
//
*/
#ifndef __cmtkProbeInfo_h_included_
#define __cmtkProbeInfo_h_included_
#include <cmtkconfig.h>
#include <Base/cmtkTypes.h>
#include <Base/cmtkVector3D.h>
namespace
cmtk
{
/** \addtogroup Base */
//@{
/** Information on volume node data.
* This class represents all information needed for trilinear interpolation and
* partial derivative computation. It holds a grid location and the node data
* on the corners of the grid cube containing that location.
*/
class ProbeInfo
{
public:
/** Node data on cube corners around given location.
* The order of the data elements is as follows: (x0,y0,z0), (x1,y0,z0),
* (x0,y1,z0), (x1,y1,z0), (x0,y0,z1), (x1,y0,z1), (x0,y1,z1), (x1,y1,z1).
*/
Types::DataItem Values[8];
/** Dimensions of the grid cube.
*/
Types::Coordinate Deltas[3];
/** Relative location of the probed coordinate.
* Represented are the relative distances of the probed coordinate from the
* surrounding cube's faces. Values range from 0 to 1. The order of the
* coefficients is dX0, dY0, dZ0, dX1, dY1, dZ1. Lower x-coordinates for
* example are weighted with dX0, others respectively.
*/
Types::Coordinate Offsets[6];
/** The real location that was probed.
*/
Vector3D Location;
/** Return data value at desired location.
* Trlinear interpolation is performed using the pre-calculated coefficients.
*/
Types::DataItem GetValueTrilinear () const
{
return static_cast<Types::DataItem>( Offsets[2]*(Offsets[1]*(Offsets[0]*Values[0]+Offsets[3]*Values[1])+
Offsets[4]*(Offsets[0]*Values[2]+Offsets[3]*Values[3]))+
Offsets[5]*(Offsets[1]*(Offsets[0]*Values[4]+Offsets[3]*Values[5])+
Offsets[4]*(Offsets[0]*Values[6]+Offsets[3]*Values[7]) ) );
}
/// Return relative weight of given index.
Types::Coordinate GetWeight( const int index ) const
{
switch ( index )
{
case 0: return Offsets[2] * Offsets[1] * Offsets[0];
case 1: return Offsets[2] * Offsets[1] * Offsets[3];
case 2: return Offsets[2] * Offsets[4] * Offsets[0];
case 3: return Offsets[2] * Offsets[4] * Offsets[3];
case 4: return Offsets[5] * Offsets[1] * Offsets[0];
case 5: return Offsets[5] * Offsets[1] * Offsets[3];
case 6: return Offsets[5] * Offsets[4] * Offsets[0];
case 7: return Offsets[5] * Offsets[4] * Offsets[3];
}
return 0;
}
};
//@}
} // namespace cmtk
#endif // #ifndef __cmtkProbeInfo_h_included_
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