VarRadiusGeometry.cpp

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/*
 *  Copyright (c) 2018, Martin Duy Tat
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#include <cmath>
#include <vector>
#include "BeamlineGeometry/VarRadiusGeometry.h"
#include "BeamlineGeometry/Euclid3D.h"
#include "AbsBeamline/MultipoleTFunctions/CoordinateTransform.h"
 
Euclid3D VarRadiusGeometry::getTransform(double fromS, double toS) const {
    Euclid3D v;
    coordinatetransform::CoordinateTransform t(0.0, 0.0, 0.0,
                                               s_0_m, lambda_left_m,
                                               lambda_right_m, rho_m);
    double phifrom = acos(t.getUnitTangentVector(fromS)[1]);
    double phito = acos(t.getUnitTangentVector(toS)[1]);
    std::vector<double> ref_from = t.calcReferenceTrajectory(fromS);
    std::vector<double> ref_to = t.calcReferenceTrajectory(toS);
    v = Euclid3D::YRotation(-(phifrom + phito));
    v.setX(ref_to[0] - ref_from[0]);
    v.setZ(ref_to[1] - ref_from[1]);
    return v;
}