base.hpp

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// OpenBEM - Copyright (C) 2026 Shashwat Sharma
 
// This file is part of OpenBEM.
 
// OpenBEM 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.
 
// You should have received a copy of the GNU General Public License along with OpenBEM.
// If not, see <https://www.gnu.org/licenses/>.
 
 
#ifndef BEM_RWG_PROJ_BASE_H
#define BEM_RWG_PROJ_BASE_H
 
#include "types.hpp"
#include "geometry/operations.hpp"
#include "geometry/primitives/triangle.hpp"
 
 
namespace bem::rwg
{
 
template <uint8_t src_num_dof>
class ProjectorBase
{
 
    static_assert((src_num_dof > 0), "ProjectorBase: `src_num_dof` must be greater than 0.");
 
public:
 
    virtual EigMatXN<Complex, src_num_dof> compute(
        const Complex k,
        ConstEigRef<EigMatNX<Float, 3>> obs_points,
        const Triangle<3>& src_tri
        ) = 0;
 
 
    static void transform_coordinates(
        EigMatNX<Float, 3>& obs_points_local,
        Triangle<2>& src_tri_local,
        ConstEigRef<EigMatNX<Float, 3>> obs_points,
        const Triangle<3>& src_tri
        )
    {
        EigMatMN<Float, 3, 3> local_uvw = src_tri.local_coordinate_basis();
        EigColVecN<Float, 3> local_origin = src_tri.local_origin();
 
        obs_points_local = GeometryOps<3>::transform_coordinate_system(
            obs_points, local_origin, local_uvw
            );
 
        src_tri_local.set_v(
            GeometryOps<3>::transform_coordinate_system(
                src_tri.v(), local_origin, local_uvw
                ).topRows(2),
            src_tri.edge_polarities()
        );
 
        return;
    };
 
};
 
}
 
#endif