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// ************************************************************************************************
//
// libformfactor: efficient and accurate computation of scattering form factors
//
//! @file ff/Edge.h
//! @brief Defines class Edge
//!
//! @homepage https://jugit.fz-juelich.de/mlz/libformfactor
//! @license GNU General Public License v3 or higher (see LICENSE)
//! @copyright Forschungszentrum Jülich GmbH 2022
//! @author Joachim Wuttke, Scientific Computing Group at MLZ (see CITATION)
//
// ************************************************************************************************
#ifndef FF_EDGE_H
#define FF_EDGE_H
#include <heinz/Complex.h>
#include <heinz/Vectors3D.h>
#include <vector>
namespace ff {
//! One edge of a polygon, for form factor computation.
class Edge {
public:
Edge(R3 Vlow, R3 Vhig);
R3 E() const { return m_E; }
R3 R() const { return m_R; }
complex_t qE(C3 q) const { return m_E.dot(q); }
complex_t qR(C3 q) const { return m_R.dot(q); }
complex_t contrib(int m, C3 qpa, complex_t qrperp) const;
private:
R3 m_E; //!< vector pointing from mid of edge to upper vertex
R3 m_R; //!< position vector of edge midpoint
};
} // namespace ff
#endif // FF_EDGE_H
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