source: sasview/sansmodels/src/sans/models/c_extensions/sphere.h @ 836fe6e

#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 level
 //                                             R: radius of the sphere
 //                                             V:The volume of the scatter
 //                                             scatter_sld: the scattering length density of the scatter
 //                                             solvent_sld: the scattering length density of the solvent
 //                             </text>
 //[FIXED]= <text> radius.width</text>
 
typedef struct {
    /// Scale factor
    //  [DEFAULT]=scale= 1.0
    double scale;

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

    /// Contrast [Å-2]
    //  [DEFAULT]=contrast= 1.0e-6 A-2
    double contrast;

        /// Incoherent Background [cm-1]
        //  [DEFAULT]=background=0 cm-1
        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