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/*
-----------------------------------------------------------------------
Copyright: 2010-2021, imec Vision Lab, University of Antwerp
2014-2021, 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_PARALLELPROJECTIONGEOMETRY3D
#define _INC_ASTRA_PARALLELPROJECTIONGEOMETRY3D
#include "ProjectionGeometry3D.h"
#include "ParallelProjectionGeometry2D.h"
namespace astra
{
/**
* This class defines a 3D parallel beam projection geometry.
*
* \par XML Configuration
* \astra_xml_item{DetectorRowCount, int, Number of detectors for each projection.}
* \astra_xml_item{DetectorColCount, int, Number of detectors for each projection.}
* \astra_xml_item{DetectorSpacingX, float, Width of each detector.}
* \astra_xml_item{DetectorSpacingY, float, Width of each detector.}
* \astra_xml_item{ProjectionAngles, vector of float, projection angles in radians.}
*
* \par MATLAB example
* \astra_code{
* proj_geom = astra_struct('parallel');\n
* proj_geom.DetectorRowCount = 512;\n
* proj_geom.DetectorColCount = 512;\n
* proj_geom.DetectorSpacingX = 1.0;\n
* proj_geom.DetectorSpacingY = 1.0;\n
* proj_geom.ProjectionAngles = linspace(0,pi,100);\n
* }
*/
class _AstraExport CParallelProjectionGeometry3D : public CProjectionGeometry3D
{
protected:
public:
/** Default constructor. Sets all numeric member variables to 0 and all pointer member variables to NULL.
*
* If an object is constructed using this default constructor, it must always be followed by a call
* to one of the initialize() methods before the object can be used. Any use before calling initialize()
* is not allowed, except calling the member function isInitialized().
*/
CParallelProjectionGeometry3D();
/** Constructor. Create an instance of the CParallelProjectionGeometry3D class.
*
* @param _iProjectionAngleCount Number of projection angles.
* @param _iDetectorRowCount Number of rows of detectors.
* @param _iDetectorColCount Number of columns detectors.
* @param _fDetectorWidth Width of a detector cell, in unit lengths. All detector cells are assumed to have equal width.
* @param _fDetectorHeight Height of a detector cell, in unit lengths. All detector cells are assumed to have equal width.
* @param _pfProjectionAngles Pointer to an array of projection angles. The angles will be copied from this array. All angles
* are represented in radians and lie in the [0,2pi[ interval.
*/
CParallelProjectionGeometry3D(int _iProjectionAngleCount,
int _iDetectorRowCount,
int _iDetectorColCount,
float32 _fDetectorWidth,
float32 _fDetectorHeight,
const float32* _pfProjectionAngles);
/** Copy constructor.
*/
CParallelProjectionGeometry3D(const CParallelProjectionGeometry3D& _projGeom);
/** Destructor.
*/
~CParallelProjectionGeometry3D();
/** Initialize the geometry with a config object.
*
* @param _cfg Configuration Object
* @return initialization successful?
*/
virtual bool initialize(const Config& _cfg);
/** Initialize the geometry. If the object has been initialized before, the object is reinitialized
* and memory is freed and reallocated if necessary.
*
* @param _iProjectionAngleCount Number of projection angles.
* @param _iDetectorRowCount Number of rows of detectors.
* @param _iDetectorColCount Number of columns detectors.
* @param _fDetectorWidth Width of a detector cell, in unit lengths. All detector cells are assumed to have equal width.
* @param _fDetectorHeight Height of a detector cell, in unit lengths. All detector cells are assumed to have equal height.
* @param _pfProjectionAngles Pointer to an array of projection angles. The angles will be copied from this array. All angles
* are represented in radians and lie in the [0,2pi[ interval.
*/
bool initialize(int _iProjectionAngleCount,
int _iDetectorRowCount,
int _iDetectorColCount,
float32 _fDetectorWidth,
float32 _fDetectorHeight,
const float32* _pfProjectionAngles);
/** Create a hard copy.
*/
virtual CProjectionGeometry3D* clone() const;
/** 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(const CProjectionGeometry3D*) const;
/** Get all settings in a Config object.
*
* @return Configuration Object.
*/
virtual Config* getConfiguration() const;
/** 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 == "parallel".
*/
virtual bool isOfType(const std::string& _sType) const;
/**
* Returns a vector giving the projection direction for a projection and detector index
*/
virtual CVector3D getProjectionDirection(int _iProjectionIndex, int _iDetectorIndex) const;
virtual void projectPoint(double fX, double fY, double fZ,
int iAngleIndex,
double &fU, double &fV) const;
/**
* Creates (= allocates) a 2D projection geometry used when projecting one slice using a 2D projector
*
* @return the 2D geometry, this pointer needs to be delete-ed after use.
*/
CParallelProjectionGeometry2D * createProjectionGeometry2D() const;
};
} // namespace astra
#endif /* _INC_ASTRA_PARALLELPROJECTIONGEOMETRY3D */
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