source: sasview/sansmodels/src/sans/models/c_extensions/capcyl.h @ c0a690c

#if !defined(capcyl_h)
#define capcyl_h

/**
 * Structure definition for CappedCylinder parameters
 */
 //[PYTHONCLASS] = CappedCylinderModel
 //[DISP_PARAMS] = rad_cyl,len_cyl,rad_cap,phi,  theta
 //[DESCRIPTION] =<text>Calculates the scattering from a cylinder with spherical section end-caps.
 //                             That is, a sphereocylinder
 //                             with end caps that have a radius larger than
 //                             that of the cylinder and the center of the
 //                             end cap radius lies within the cylinder.
 //                             Note: As the length of cylinder -->0,
 //                             it becomes a ConvexLens.
 //                             It must be that rad_cyl <(=) rad_cap.
 //                             [Parameters];
 //                             scale: volume fraction of spheres,
 //                             background:incoherent background,
 //                             rad_cyl: radius of the cylinder,
 //                             len_cyl: length of the cylinder,
 //                             rad_cap: radius of the semi-spherical cap,
 //                             sld_capcyl: SLD of the capped cylinder,
 //                             sld_solv: SLD of the solvent.
 //             </text>
 //[FIXED]=  rad_cyl.width;len_cyl;rad_cap;phi.width; theta.width
 //[ORIENTATION_PARAMS]= <text> phi; theta; phi.width; theta.width</text>

typedef struct {
    /// Scale factor
    //  [DEFAULT]=scale= 1.0
    double scale;

    /// rad_cyl [A]
    //  [DEFAULT]=rad_cyl=20.0 [A]
    double rad_cyl;

    /// length of the cylinder
    //  [DEFAULT]=len_cyl=400.0 [A]
    double len_cyl;

    /// Radius of sphere [A]
    //  [DEFAULT]=rad_cap=40.0 [A]
    double rad_cap;

    /// sld_capcyl [1/A^(2)]
    //  [DEFAULT]=sld_capcyl= 1.0e-6 [1/A^(2)]
    double sld_capcyl;

    /// sld_solv [1/A^(2)]
    //  [DEFAULT]=sld_solv= 6.3e-6 [1/A^(2)]
    double sld_solv;

        /// Incoherent Background [1/cm]
        //  [DEFAULT]=background=0.0 [1/cm]
        double background;

    /// Angle of the main axis against z-axis in detector plane [deg]
    //  [DEFAULT]=theta=0.0 [deg]
    double theta;
    /// Azimuthal angle around z-axis in detector plane [deg]
    //  [DEFAULT]=phi=0.0 [deg]
    double phi;

} CapCylParameters;



/// 1D scattering function
double capcyl_analytical_1D(CapCylParameters *pars, double q);

/// 2D scattering function
double capcyl_analytical_2D(CapCylParameters *pars, double q, double phi);
double capcyl_analytical_2DXY(CapCylParameters *pars, double qx, double qy);
double capcyl_analytical_2D_scaled(CapCylParameters *pars, double q, double q_x, double q_y);

#endif