source: sasview/sansmodels/src/sans/models/c_extensions/oblate.h @ 0ab485b

#if !defined(oblate_h)
#define oblate_h
/** Structure definition for oblate parameters
 * [PYTHONCLASS] = OblateModel
 * [DISP_PARAMS] = major_core, minor_core, major_shell,minor_shell
   [DESCRIPTION] = <text>[OblateCoreShellModel] Calculates the form factor for an oblate
                        ellipsoid particle with a core_shell structure.
                        The form factor is averaged over all possible
                        orientations of the ellipsoid such that P(q)
                        = scale*<f^2>/Vol + bkg, where f is the
                        single particle scattering amplitude.
                        [Parameters]:
                        major_core = radius of major_core,
                        minor_core = radius of minor_core,
                        major_shell = radius of major_shell,
                        minor_shell = radius of minor_shell,
                        contrast = SLD_core - SLD_shell
                        sld_solvent = SLD_solvent
                        background = Incoherent bkg
                        scale =scale
                        Note:It is the users' responsibility to ensure
                        that shell radii are larger than core radii.
                        </text>

   [FIXED] = <text>major_core.width;minor_core.width; major_shell.width; minor_shell.width</text>
   [ORIENTATION_PARAMS]= <text>axis_phi; axis_theta; axis_phi.width; axis_theta.width</text>

 **/
typedef struct {
    /// Scale factor
    //  [DEFAULT]=scale=1.0
    double scale;
    /// Major core of oblate [A]
    //  [DEFAULT]=major_core=200.0 [A]
    double major_core;
        /// Minor core of oblate [A]
    //  [DEFAULT]=minor_core=20.0 [A]
    double minor_core;
        /// Major shell of oblate [A]
    //  [DEFAULT]=major_shell=250.0 [A]
    double major_shell;
        /// Minor shell of oblate [A]
    //  [DEFAULT]=minor_shell=30.0 [A]
    double minor_shell;
    ///  Scattering contrast [1/A²]
    //  [DEFAULT]=contrast=1.0e-6 [1/A²]
    double contrast;
        /// Solvent scattering length density  [1/A²]
    //  [DEFAULT]=sld_solvent=6.3e-6 [1/A²]
    double sld_solvent;
        /// Incoherent Background [1/cm] 0.001
        //  [DEFAULT]=background=0.001 [1/cm]
        double background;
        //Disable for now
    /// Orientation of the oblate axis w/respect incoming beam [rad]
    //  [DEFAULT]=axis_theta=1.0 [rad]
    double axis_theta;
    /// Orientation of the oblate in the plane of the detector [rad]
    //  [DEFAULT]=axis_phi=1.0 [rad]
    double axis_phi;

} OblateParameters;



/// 1D scattering function
double oblate_analytical_1D(OblateParameters *pars, double q);

/// 2D scattering function
double oblate_analytical_2D(OblateParameters *pars, double q, double phi);
double oblate_analytical_2DXY(OblateParameters *pars, double qx, double qy);
//double oblate_analytical_2D_scaled(OblateParameters *pars, double q, double q_x, double q_y);

#endif