1 // Copyright (C) 2019-2023 CEA, EDF
3 // This library is free software; you can redistribute it and/or
4 // modify it under the terms of the GNU Lesser General Public
5 // License as published by the Free Software Foundation; either
6 // version 2.1 of the License, or (at your option) any later version.
8 // This library is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 // Lesser General Public License for more details.
13 // You should have received a copy of the GNU Lesser General Public
14 // License along with this library; if not, write to the Free Software
15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
20 #ifndef PlaneGCSSolver_GeomExtensions_H_
21 #define PlaneGCSSolver_GeomExtensions_H_
23 #include <PlaneGCSSolver_Defs.h>
26 /// \brife SHAPER's implementation of B-spline curves in PlaneGCS solver
27 class BSplineImpl : public BSpline
30 virtual DeriVector2 Value(double u, double du, double* derivparam = 0);
31 virtual DeriVector2 CalculateNormal(Point &p, double* derivparam = 0);
33 virtual BSplineImpl* Copy();
36 /// Return the index of start knot for the given parameter.
37 /// Parameter is updated accordingly, if the B-spline curve is periodic
38 /// and the parameter is out of period.
39 int spanIndex(double& u);
41 /// Collect the list of poles and their weights affecting the given span
42 void spanPolesAndWeights(int theSpanIndex,
43 double* theDerivParam,
44 std::vector<GCS::DeriVector2>& thePoles,
45 std::vector<double>& theWeights) const;
47 /// Execute De Boor algorithm to calculate B-spline curve's value
48 void performDeBoor(double theU, int theSpanIndex,
49 std::vector<GCS::DeriVector2>& thePoles, std::vector<double>& theWeights,
50 GCS::DeriVector2& theValue, GCS::DeriVector2& theDerivative) const;
52 /// Calculate the value and the first derivative for the given parameter on B-spline
53 void d1(double theU, double* theDerivParam,
54 GCS::DeriVector2& theValue, GCS::DeriVector2& theDerivative);
56 /// Find the parameter on B-spline corresponding to the given point
57 /// \return \c false if it is unable to calculate the parameter
58 bool parameter(const Point& thePoint, double& theParam) const;
61 VEC_D myFlatKnots; /// indices of knots duplicated by multiplicity