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// Copyright (c) 2005 INRIA Sophia-Antipolis (France). // All rights reserved. // // This file is part of CGAL (www.cgal.org). // // $URL: https://github.com/CGAL/cgal/blob/v6.1/Stream_lines_2/include/CGAL/Euler_integrator_2.h $ // $Id: include/CGAL/Euler_integrator_2.h b26b07a1242 $ // SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial // // // Author(s) : Abdelkrim Mebarki #ifndef CGAL_EULER_INTEGRATOR_2_H_ #define CGAL_EULER_INTEGRATOR_2_H_ #include #include namespace CGAL { // The class Euler_integrator_2 is a model of the concept Integrator template class Euler_integrator_2 { public: typedef Euler_integrator_2 self; typedef typename VectorField_2::FT FT; typedef typename VectorField_2::Point_2 Point_2; typedef typename VectorField_2::Vector_2 Vector_2; typedef typename VectorField_2::Vector_field_2 Vector_field_2; protected: FT default_integration_step; public: Euler_integrator_2(); Euler_integrator_2(const FT & integration_step); inline Point_2 operator()(const Point_2 & p, const Vector_field_2 & vector_field_2, const bool & index) const; inline Point_2 operator()(const Point_2 & p, const Vector_field_2 & vector_field_2, const FT & integration_step, const bool & index) const; inline Point_2 operator()(const Point_2 & p, const Vector_field_2 & vector_field_2, const FT & integration_step, Vector_2 v, const bool & index) const; inline FT get_default_integration_step() { return default_integration_step; } // just for debugging inline FT distance(const Point_2 & p, const Point_2 & q) { return sqrt(((p.x() - q.x())*(p.x() - q.x()))+((p.y() - q.y())*(p.y() - q.y()))); } }; template Euler_integrator_2::Euler_integrator_2() : default_integration_step(1.0) {} // An additional parameter in the constructor to specify the default integration step template Euler_integrator_2::Euler_integrator_2(const FT & integration_step) : default_integration_step(integration_step) {} template inline typename Euler_integrator_2::Point_2 Euler_integrator_2::operator() (const Point_2 & p, const Vector_field_2 & , const FT & integration_step, Vector_2 v, const bool & index) const { if (!index) { Vector_2 v_t(v.x()*(-1),v.y()*(-1)); v = v_t; } Vector_2 Euler_step(v.x()*integration_step, v.y()*integration_step); return Point_2(p.x() + Euler_step.x(), p.y() + Euler_step.y()); } template inline typename Euler_integrator_2::Point_2 Euler_integrator_2::operator() (const Point_2 & p, const Vector_field_2 & vector_field_2, const FT & integration_step, const bool & index) const { Vector_2 v; v = vector_field_2.get_field(p).first; return this->operator()(p, vector_field_2, integration_step, v, index); } template inline typename Euler_integrator_2::Point_2 Euler_integrator_2::operator() (const Point_2 & p, const Vector_field_2 & vector_field_2, const bool & index) const { return this->operator()(p, vector_field_2, default_integration_step,index); } } //namespace CGAL #endif