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/* Gerris - The GNU Flow Solver
 * Copyright (C) 2001-2011 National Institute of Water and Atmospheric Research
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.  
 */

#ifndef __VOF_H__
#define __VOF_H__

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#include "advection.h"
#include "variable.h"

#define GFS_IS_FULL(f)             ((f) == 0. || (f) == 1.)

gdouble gfs_line_area              (const FttVector * m, 
				    gdouble alpha);
void    gfs_line_center            (const FttVector * m, 
				    gdouble alpha, 
				    gdouble a, 
				    FttVector * p);
gdouble gfs_line_area_center       (const FttVector * m, 
				    gdouble alpha, 
				    FttVector * p);
gdouble gfs_line_alpha             (const FttVector * m, 
				    gdouble c);
#if FTT_2D
#  define gfs_plane_volume         gfs_line_area
#  define gfs_plane_alpha          gfs_line_alpha
#  define gfs_plane_center         gfs_line_center
#  define gfs_plane_area_center     gfs_line_area_center
#else /* 3D */
gdouble gfs_plane_volume           (const FttVector * m, 
				    gdouble alpha);
gdouble gfs_plane_alpha            (const FttVector * m, 
				    gdouble c);
void    gfs_plane_center           (const FttVector * m, 
				    gdouble alpha, 
				    gdouble a,
				    FttVector * p);
gdouble gfs_plane_area_center      (const FttVector * m, 
				    gdouble alpha, 
				    FttVector * p);
#endif /* 3D */
void    gfs_youngs_gradient        (FttCell * cell, 
				    GfsVariable * v,
				    FttVector * g);

/* GfsVariableTracerVOF: header */

typedef struct _GfsVariableTracerVOF        GfsVariableTracerVOF;
typedef struct _GfsVariableTracerVOFClass   GfsVariableTracerVOFClass;

struct _GfsVariableTracerVOF {
  /*< private >*/
  GfsVariableTracer parent;
  /* a list of GfsVariableVOFConcentration associated with this VOF tracer */
  GtsSListContainer * concentrations;

  /*< public >*/
  GfsVariable * m[FTT_DIMENSION], * alpha;
};

struct _GfsVariableTracerVOFClass {
  /*< private >*/
  GfsVariableClass parent_class;

  /*< public >*/
  void (* update) (GfsVariable * v, GfsDomain * domain);
};

#define GFS_VARIABLE_TRACER_VOF(obj)            GTS_OBJECT_CAST (obj,\
					           GfsVariableTracerVOF,\
					           gfs_variable_tracer_vof_class ())
#define GFS_VARIABLE_TRACER_VOF_CLASS(klass)    GTS_OBJECT_CLASS_CAST (klass,\
						 GfsVariableTracerVOFClass,\
						 gfs_variable_tracer_vof_class())
#define GFS_IS_VARIABLE_TRACER_VOF(obj)         (gts_object_is_from_class (obj,\
						   gfs_variable_tracer_vof_class ()))

GfsVariableTracerVOFClass * gfs_variable_tracer_vof_class  (void);

/* GfsVariableVOFConcentration: header */

typedef struct _GfsVariableVOFConcentration        GfsVariableVOFConcentration;

struct _GfsVariableVOFConcentration {
  /*< private >*/
  GfsVariableTracer parent;

  /*< public >*/
  GfsVariableTracerVOF * vof;
};

#define GFS_VARIABLE_VOF_CONCENTRATION(obj)            GTS_OBJECT_CAST (obj,\
					                GfsVariableVOFConcentration,\
					                gfs_variable_vof_concentration_class ())
#define GFS_IS_VARIABLE_VOF_CONCENTRATION(obj)         (gts_object_is_from_class (obj,\
							gfs_variable_vof_concentration_class ()))

GfsVariableClass * gfs_variable_vof_concentration_class  (void);

/* GfsVariableTracerVOFHeight: header */

typedef struct _GfsVariableTracerVOFHeight GfsVariableTracerVOFHeight;

struct _GfsVariableTracerVOFHeight {
  /*< private >*/
  GfsVariableTracerVOF parent;

  /*< public >*/
  GfsVariable * hb[FTT_DIMENSION], * ht[FTT_DIMENSION];
};

#define GFS_VARIABLE_TRACER_VOF_HEIGHT(obj)            GTS_OBJECT_CAST (obj,\
					           GfsVariableTracerVOFHeight,\
					           gfs_variable_tracer_vof_height_class ())
#define GFS_IS_VARIABLE_TRACER_VOF_HEIGHT(obj)         (gts_object_is_from_class (obj,\
						   gfs_variable_tracer_vof_height_class ()))

GfsVariableTracerVOFClass * gfs_variable_tracer_vof_height_class  (void);

void     gfs_tracer_vof_advection  (GfsDomain * domain,
				    GfsAdvectionParams * par);
gdouble  gfs_vof_face_value        (const FttCellFace * face, 
				    GfsVariableTracerVOF * t);
gdouble  gfs_vof_face_fraction     (const FttCellFace * face,
				    GfsVariableTracerVOF * t);
guint    gfs_vof_facet             (FttCell * cell,
				    GfsVariableTracerVOF * t,
				    FttVector * p,
				    FttVector * m);
gdouble  gfs_vof_facet_distance2   (FttCell * cell,
				    GfsVariableTracerVOF * t,
				    GtsPoint * p);
gdouble  gfs_vof_center            (FttCell * cell,
				    GfsVariableTracerVOF * t,
				    FttVector * p);
gdouble  gfs_vof_plane_interpolate (FttCell * cell,
				    FttVector * p,
				    guint level,
				    GfsVariableTracerVOF * t,
				    FttVector * m);
gdouble  gfs_vof_interpolate       (FttCell * cell,
				    FttVector * p,
				    guint level,
				    GfsVariableTracerVOF * t);
gdouble  gfs_height_curvature      (FttCell * cell, 
				    GfsVariableTracerVOF * t,
				    gdouble * kmax);
gboolean gfs_curvature_along_direction (FttCell * cell, 
					GfsVariableTracerVOFHeight * t,
					FttComponent c,
					gdouble * kappa,
					gdouble * kmax);
gdouble  gfs_height_curvature_new  (FttCell * cell, 
				    GfsVariableTracerVOFHeight * t,
				    gdouble * kmax);
gdouble  gfs_fit_curvature         (FttCell * cell,
				    GfsVariableTracerVOF * t,
				    gdouble * kmax);
gdouble  gfs_vof_correctness       (FttCell * cell, 
				    GfsVariableTracerVOF * t);
GfsVariable * gfs_closest_height   (FttCell * cell, 
				    GfsVariableTracerVOFHeight * t,
				    FttComponent c,
				    gdouble * orientation);

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* __VOF_H__ */