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/*
-----------------------------------------------------------------------
Copyright: 2010-2018, imec Vision Lab, University of Antwerp
2014-2018, CWI, Amsterdam
Contact: astra@astra-toolbox.com
Website: http://www.astra-toolbox.com/
This file is part of the ASTRA Toolbox.
The ASTRA Toolbox 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 ASTRA Toolbox 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 ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
*/
#ifndef _INC_ASTRA_PARALLELVECPROJECTIONGEOMETRY2D
#define _INC_ASTRA_PARALLELVECPROJECTIONGEOMETRY2D
#include "ProjectionGeometry2D.h"
#include "GeometryUtil2D.h"
namespace astra
{
/**
* This class defines a 2D parallel beam projection geometry.
*
* \par XML Configuration
* \astra_xml_item{DetectorCount, int, Number of detectors for each projection.}
*
* \par MATLAB example
* \astra_code{
* proj_geom = astra_struct('parallel_vec');\n
* proj_geom.DetectorCount = 512;\n
* proj_geom.Vectors = V;\n
* }
*
* \par Vectors
* Vectors is a matrix containing the actual geometry. Each row corresponds
* to a single projection, and consists of:
* ( rayX, rayY, dX, dY, uX, uY)
* ray: the ray direction
* d : the centre of the detector line
* u : the vector from detector pixel (0) to (1)
*/
class _AstraExport CParallelVecProjectionGeometry2D : public CProjectionGeometry2D
{
protected:
SParProjection *m_pProjectionAngles;
public:
/** Default constructor. Sets all variables to zero. Note that this constructor leaves the object in an unusable state and must
* be followed by a call to init().
*/
CParallelVecProjectionGeometry2D();
/** Constructor.
*
* @param _iProjectionAngleCount Number of projection angles.
* @param _iDetectorCount Number of detectors, i.e., the number of detector measurements for each projection angle.
* @param _pfProjectionAngles Pointer to an array of projection angles. The angles will be copied from this array.
*/
CParallelVecProjectionGeometry2D(int _iProjectionAngleCount,
int _iDetectorCount,
const SParProjection* _pfProjectionAngles);
/** Copy constructor.
*/
CParallelVecProjectionGeometry2D(const CParallelVecProjectionGeometry2D& _projGeom);
/** Assignment operator.
*/
CParallelVecProjectionGeometry2D& operator=(const CParallelVecProjectionGeometry2D& _other);
/** Destructor.
*/
virtual ~CParallelVecProjectionGeometry2D();
/** Initialize the geometry with a config object.
*
* @param _cfg Configuration Object
* @return initialization successful?
*/
virtual bool initialize(const Config& _cfg);
/** Initialization. This function MUST be called after using the default constructor and MAY be called to
* reset a previously initialized object.
*
* @param _iProjectionAngleCount Number of projection angles.
* @param _iDetectorCount Number of detectors, i.e., the number of detector measurements for each projection angle.
* @param _pfProjectionAngles Pointer to an array of projection angles. The angles will be copied from this array.
*/
bool initialize(int _iProjectionAngleCount,
int _iDetectorCount,
const SParProjection* _pfProjectionAngles);
virtual bool _check();
/** Create a hard copy.
*/
virtual CProjectionGeometry2D* clone();
/** Returns true if the type of geometry defined in this class is the one specified in _sType.
*
* @param _sType geometry type to compare to.
* @return true if _sType == "fanflat_vec".
*/
virtual bool isOfType(const std::string& _sType);
/** Return true if this geometry instance is the same as the one specified.
*
* @return true if this geometry instance is the same as the one specified.
*/
virtual bool isEqual(CProjectionGeometry2D*) const;
/** Get all settings in a Config object.
*
* @return Configuration Object.
*/
virtual Config* getConfiguration() const;
/** Get the value for t and theta, based upon the row and column index.
*
* @param _iRow row index
* @param _iColumn column index
* @param _fT output: value of t
* @param _fTheta output: value of theta, always lies within the [0,pi[ interval.
*/
virtual void getRayParams(int _iRow, int _iColumn, float32& _fT, float32& _fTheta) const;
/**
* Returns a vector describing the direction of a ray belonging to a certain detector
*
* @param _iProjectionIndex index of projection
* @param _iProjectionIndex index of detector
*
* @return a unit vector describing the direction
*/
virtual CVector3D getProjectionDirection(int _iProjectionIndex, int _iDetectorIndex);
const SParProjection* getProjectionVectors() const { return m_pProjectionAngles; }
};
} // namespace astra
#endif /* _INC_ASTRA_PARALLELVECPROJECTIONGEOMETRY2D */
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