#if !defined(ell_cylinder_h)
#define ell_cylinder_h

/** Structure definition for cylinder parameters
 * [PYTHONCLASS] = EllipticalCylinderModel
 * [DISP_PARAMS] = r_minor, r_ratio, length, cyl_theta, cyl_phi, cyl_psi
 * [DESCRIPTION] = <text> Model parameters: r_minor = the radius of minor axis of the cross section
r_ratio = the ratio of (r_major /r_minor >= 1)
length = the length of the cylinder
contrast = SLD of solvent - SLD of the cylinder
background = incoherent background
  *</text>
 * [FIXED]= <text> cyl_phi.width;
 * cyl_theta.width; cyl_psi.width; length.width; r_minor.width; r_ratio.width
 *</text>
 * [ORIENTATION_PARAMS]= cyl_phi; cyl_theta; cyl_psi;  cyl_phi.width; cyl_theta.width; cyl_psi.width
 * */


typedef struct {
    /// Scale factor
    //  [DEFAULT]=scale=1.0
    double scale;
    /// Minor radius [A]
    //  [DEFAULT]=r_minor=20.0 [A]
    double r_minor;
    /// Ratio of major/minor radii
    //  [DEFAULT]=r_ratio=1.5
    double r_ratio;
    /// Length of the cylinder [A]
    //  [DEFAULT]=length=400.0 [A]
    double length;
    /// Contrast [1/A^(2)]
    //  [DEFAULT]=contrast=3.0e-6 [1/A^(2)]
    double contrast;
	/// Incoherent Background [1/cm] 0.000
	//  [DEFAULT]=background=0 [1/cm]
	double background;
    /// Orientation of the cylinder axis w/respect incoming beam [rad]
    //  [DEFAULT]=cyl_theta=1.57 [rad]
    double cyl_theta;
    /// Orientation of the cylinder in the plane of the detector [rad]
    //  [DEFAULT]=cyl_phi=0.0 [rad]
    double cyl_phi;
    /// Orientation of major radius of the cross-section w/respect vector q [rad]
    //  [DEFAULT]=cyl_psi=0.0 [rad]
    double cyl_psi;
} EllipticalCylinderParameters;



/// 1D scattering function
double elliptical_cylinder_analytical_1D(EllipticalCylinderParameters *pars, double q);

/// 2D scattering function
double elliptical_cylinder_analytical_2D(EllipticalCylinderParameters *pars, double q, double phi);
double elliptical_cylinder_analytical_2DXY(EllipticalCylinderParameters *pars, double qx, double qy);
double elliptical_cylinder_analytical_2D_scaled(EllipticalCylinderParameters *pars, double q, double q_x, double q_y);

#endif