source: sasview/sansmodels/src/sans/models/c_extensions/pearlnecklace.h @ d6a3cf0

#if !defined(o_h)
#define pearl_necklace_h

/**
 * Structure definition for sphere parameters
 */
 //[PYTHONCLASS] = PearlNecklaceModel
 //[DISP_PARAMS] = radius, edge_separation
 //[DESCRIPTION] =<text>Calculate form factor for Pearl Necklace Model
//                              [Macromol. Symp. 2004, 211, 25-42]
 //                             Parameters:
 //                             background:background
 //                             scale: scale factor
 //                             sld_pearl: the SLD of the pearl spheres
 //                 sld_string: the SLD of the strings
 //                             sld_solv: the SLD of the solvent
 //                             num_pearls: number of the pearls
 //                             radius: the radius of a pearl
 //                             edge_separation: the length of string segment; surface to surface
 //                             thick_string: thickness (ie, diameter) of the string
 //             </text>
 //[FIXED]=  <text>radius.width; edge_separation.width</text>
 //[NON_FITTABLE_PARAMS]= <text></text>
 //[ORIENTATION_PARAMS]= <text> </text>

typedef struct {
    /// Scale factor
    //  [DEFAULT]=scale= 1.0
        double scale;
    /// radius [A]
    //  [DEFAULT]=radius=80.0 [A]
        double radius;
        ///     edge_separation
        //  [DEFAULT]=edge_separation= 350 [A]
        double edge_separation;
        ///     thick_string [A]
        //  [DEFAULT]=thick_string= 2.5 [A]
        double thick_string;
        ///     num_pearls
        //  [DEFAULT]=num_pearls= 3
        double num_pearls;
        ///     sld_pearl
        //  [DEFAULT]=sld_pearl= 1.0e-06 [1/A^(2)]
        double sld_pearl;
        ///     sld_string
        //  [DEFAULT]=sld_string= 1.0e-06 [1/A^(2)]
        double sld_string;
        ///     sld_solv
        //  [DEFAULT]=sld_solv= 6.3e-06 [1/A^(2)]
        double sld_solv;
        /// Background
        //  [DEFAULT]=background=0
        double background;

}PeralNecklaceParameters;

double pearl_necklace_kernel(double dq[], double q);

/// 1D scattering function
double pearl_necklace_analytical_1D(PeralNecklaceParameters *pars, double q);

/// 2D scattering function
double pearl_necklace_analytical_2D(PeralNecklaceParameters *pars, double q, double phi);
double pearl_necklace_analytical_2DXY(PeralNecklaceParameters *pars, double qx, double qy);

#endif