feitspline.h

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/*
 *
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 *               ##   ##  ##   ##  ##      ##      ## ### ##
 *              ##   ##  ##   ##  ####    ####    ##  #  ##
 *             ##   ##  ##   ##  ##      ##      ##     ##
 *            ##   ##  ##   ##  ##      ##      ##     ##
 *            #####    #####   ##      ######  ##     ##
 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef feitspline_h
#define feitspline_h
 
#include "feibspline.h"
#include "floatarray.h"
#include "floatmatrix.h"
 
/*
 * alternatively, it is possible to store for individual control points open local knot vector;
 * however, this is not enough as I need to know how many knots have been prepended and appended
 * (see createLocalKnotVector) as these are relevant for finding relevant knot span using BSpline method
 * (this could be overcome by writing corresponding TSpline method) and for extraction proper
 * basis function and its derivatives (computed by BSpline methods)
 */


#define _IFT_TSplineInterpolation_weights "weights"
#define _IFT_TSplineInterpolation_localIndexKnotVectorU "localindexknotvectoru"
#define _IFT_TSplineInterpolation_localIndexKnotVectorV "localindexknotvectorv"
#define _IFT_TSplineInterpolation_localIndexKnotVectorW "localindexknotvectorw"
 
namespace oofem {
class OOFEM_EXPORT TSplineInterpolation : public BSplineInterpolation
{
protected:
    std::vector< std::array<IntArray, 3> > localIndexKnotVector;
    int totalNumberOfControlPoints = 0;
    FloatArray weights;
    //FloatArray openLocalKnotVector;
public:
    TSplineInterpolation(int nsd) : BSplineInterpolation(nsd) { }
 
    void initializeFrom(InputRecord &ir, ParameterManager&pm, int elnum, int priority) override;
 
    void setNumberOfControlPoints(int num) { this->totalNumberOfControlPoints = num; }
    void evalN(FloatArray &answer, const FloatArray &lcoords, const FEICellGeometry &cellgeo) const override;
    double evaldNdx(FloatMatrix &answer, const FloatArray &lcoords, const FEICellGeometry &cellgeo) const override;
    void local2global(FloatArray &answer, const FloatArray &lcoords, const FEICellGeometry &cellgeo) const override;
    int global2local(FloatArray &answer, const FloatArray &lcoords, const FEICellGeometry &cellgeo) const override {
        OOFEM_ERROR("Not yet implemented, contact lazy dr for implementation");
    }
    void giveJacobianMatrixAt(FloatMatrix &jacobianMatrix, const FloatArray &lcoords, const FEICellGeometry &cellgeo) const override;
 
    int giveKnotSpanBasisFuncMask(const IntArray &knotSpan, IntArray &mask) const override;
    int giveNumberOfKnotSpanBasisFunctions(const IntArray &knotSpan) const override;
 
    const char *giveClassName() const { return "TSplineInterpolation"; }
 
protected:
    double basisFunction(double u, int p, const FloatArray &U, const IntArray &I) const;
    void dersBasisFunction(int n, double u, int p, const FloatArray &U, const IntArray &I, FloatArray &ders) const;
    void createLocalKnotVector(FloatArray& answer, int p, const FloatArray &U, const IntArray &I, int &prepend, int &append) const;
    int giveKnotSpanBasisFuncMask(const IntArray &startKnotSpan, const IntArray &endKnotSpan, IntArray &mask) const;
    int  giveNumberOfKnotSpanBasisFunctions(const IntArray &startKnotSpan, const IntArray &endKnotSpan) const;
}; // end of TSplineInterpolation class definition
} // end namespace oofem
#endif //feitspline_h