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+/*
+-----------------------------------------------------------------------
+Copyright 2012 iMinds-Vision Lab, University of Antwerp
+
+Contact: astra@ua.ac.be
+Website: http://astra.ua.ac.be
+
+
+This file is part of the
+All Scale Tomographic Reconstruction Antwerp Toolbox ("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/>.
+
+-----------------------------------------------------------------------
+$Id$
+*/
+
+#include "astra/FanFlatBeamLineKernelProjector2D.h"
+
+#include <cmath>
+#include <cstring>
+#include <boost/lexical_cast.hpp>
+
+#include "astra/DataProjectorPolicies.h"
+
+using namespace std;
+using namespace astra;
+
+#include "astra/FanFlatBeamLineKernelProjector2D.inl"
+
+// type of the projector, needed to register with CProjectorFactory
+std::string CFanFlatBeamLineKernelProjector2D::type = "line_fanflat";
+
+
+//----------------------------------------------------------------------------------------
+// default constructor
+CFanFlatBeamLineKernelProjector2D::CFanFlatBeamLineKernelProjector2D()
+{
+ _clear();
+}
+
+//----------------------------------------------------------------------------------------
+// constructor
+CFanFlatBeamLineKernelProjector2D::CFanFlatBeamLineKernelProjector2D(CFanFlatProjectionGeometry2D* _pProjectionGeometry,
+ CVolumeGeometry2D* _pReconstructionGeometry)
+
+{
+ _clear();
+ initialize(_pProjectionGeometry, _pReconstructionGeometry);
+}
+
+//----------------------------------------------------------------------------------------
+// destructor
+CFanFlatBeamLineKernelProjector2D::~CFanFlatBeamLineKernelProjector2D()
+{
+ clear();
+}
+
+//---------------------------------------------------------------------------------------
+// Clear - Constructors
+void CFanFlatBeamLineKernelProjector2D::_clear()
+{
+ CProjector2D::_clear();
+ m_bIsInitialized = false;
+}
+
+//---------------------------------------------------------------------------------------
+// Clear - Public
+void CFanFlatBeamLineKernelProjector2D::clear()
+{
+ CProjector2D::clear();
+ m_bIsInitialized = false;
+}
+
+//---------------------------------------------------------------------------------------
+// Check
+bool CFanFlatBeamLineKernelProjector2D::_check()
+{
+ // check base class
+ ASTRA_CONFIG_CHECK(CProjector2D::_check(), "FanFlatBeamLineKernelProjector2D", "Error in Projector2D initialization");
+
+ ASTRA_CONFIG_CHECK(dynamic_cast<CFanFlatProjectionGeometry2D*>(m_pProjectionGeometry) || dynamic_cast<CFanFlatVecProjectionGeometry2D*>(m_pProjectionGeometry), "FanFlatBeamLineKernelProjector2D", "Unsupported projection geometry");
+
+ ASTRA_CONFIG_CHECK(m_pVolumeGeometry->getPixelLengthX() == m_pVolumeGeometry->getPixelLengthY(), "FanFlatBeamLineKernelProjector2D", "Pixel height must equal pixel width.");
+
+ // success
+ return true;
+}
+
+//---------------------------------------------------------------------------------------
+// Initialize, use a Config object
+bool CFanFlatBeamLineKernelProjector2D::initialize(const Config& _cfg)
+{
+ ASTRA_ASSERT(_cfg.self);
+
+ // if already initialized, clear first
+ if (m_bIsInitialized) {
+ clear();
+ }
+
+ // initialization of parent class
+ if (!CProjector2D::initialize(_cfg)) {
+ return false;
+ }
+
+ // success
+ m_bIsInitialized = _check();
+ return m_bIsInitialized;
+}
+
+//---------------------------------------------------------------------------------------
+// Initialize
+bool CFanFlatBeamLineKernelProjector2D::initialize(CFanFlatProjectionGeometry2D* _pProjectionGeometry,
+ CVolumeGeometry2D* _pVolumeGeometry)
+{
+ // if already initialized, clear first
+ if (m_bIsInitialized) {
+ clear();
+ }
+
+ // hardcopy geometries
+ m_pProjectionGeometry = _pProjectionGeometry->clone();
+ m_pVolumeGeometry = _pVolumeGeometry->clone();
+
+ // success
+ m_bIsInitialized = _check();
+ return m_bIsInitialized;
+}
+
+//----------------------------------------------------------------------------------------
+// Get maximum amount of weights on a single ray
+int CFanFlatBeamLineKernelProjector2D::getProjectionWeightsCount(int _iProjectionIndex)
+{
+ int maxDim = max(m_pVolumeGeometry->getGridRowCount(), m_pVolumeGeometry->getGridColCount());
+ return maxDim * 2 + 1;
+}
+
+//----------------------------------------------------------------------------------------
+// Single Ray Weights
+void CFanFlatBeamLineKernelProjector2D::computeSingleRayWeights(int _iProjectionIndex,
+ int _iDetectorIndex,
+ SPixelWeight* _pWeightedPixels,
+ int _iMaxPixelCount,
+ int& _iStoredPixelCount)
+{
+ ASTRA_ASSERT(m_bIsInitialized);
+ StorePixelWeightsPolicy p(_pWeightedPixels, _iMaxPixelCount);
+ projectSingleRay(_iProjectionIndex, _iDetectorIndex, p);
+ _iStoredPixelCount = p.getStoredPixelCount();
+}
+
+//----------------------------------------------------------------------------------------
+// Splat a single point
+std::vector<SDetector2D> CFanFlatBeamLineKernelProjector2D::projectPoint(int _iRow, int _iCol)
+{
+ std::vector<SDetector2D> res;
+ return res;
+}
+
+//----------------------------------------------------------------------------------------
+//Result is always in [-PI/2; PI/2]
+float32 CFanFlatBeamLineKernelProjector2D::angleBetweenVectors(float32 _fAX, float32 _fAY, float32 _fBX, float32 _fBY)
+{
+ float32 sinAB = (_fAX*_fBY - _fAY*_fBX)/sqrt((_fAX*_fAX + _fAY*_fAY)*(_fBX*_fBX + _fBY*_fBY));
+ return asin(sinAB);
+}
+
+//----------------------------------------------------------------------------------------