source: sasview/sansmodels/src/sans/models/c_extensions/sphere.h @ 2e38ebb

#if !defined(sphere_h)
#define sphere_h

/**
 * Structure definition for sphere parameters
 */
 //[PYTHONCLASS] = SphereModel
 //[DISP_PARAMS] = radius
 //[DESCRIPTION] =<text>P(q)=(scale/V)*[3V(scatter_sld-solvent_sld)*(sin(qR)-qRcos(qR))
 //                                             /(qR)^3]^(2)+bkg
 //
 //                             bkg:background, R: radius of sphere
 //                             V:The volume of the scatter
 //                             contrast:SLD difference between
 //                             scatter and solvent
 //                             scatter_sld: the SLD of the scatter
 //                             solvent_sld: the SLD of the solvent
 //
 //             </text>
 //[FIXED]=  radius.width
 //[ORIENTATION_PARAMS]= <text> </text>

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

    /// Radius of sphere [A]
    //  [DEFAULT]=radius=60.0 [A]
    double radius;

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

        /// Incoherent Background [1/cm]
        //  [DEFAULT]=background=0 [1/cm]
        double background;
} SphereParameters;



/// 1D scattering function
double sphere_analytical_1D(SphereParameters *pars, double q);

/// 2D scattering function
double sphere_analytical_2D(SphereParameters *pars, double q, double phi);
double sphere_analytical_2DXY(SphereParameters *pars, double qx, double qy);

#endif