/*
 * $Id: contour.h,v 1.9 2004/08/09 00:51:29 sfeam Exp $
 */

/* GNUPLOT - contour.h */

/*[
 * Copyright 1999, 2004   Thomas Williams, Colin Kelley
 *
 * Permission to use, copy, and distribute this software and its
 * documentation for any purpose with or without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.
 *
 * Permission to modify the software is granted, but not the right to
 * distribute the complete modified source code.  Modifications are to
 * be distributed as patches to the released version.  Permission to
 * distribute binaries produced by compiling modified sources is granted,
 * provided you
 *   1. distribute the corresponding source modifications from the
 *    released version in the form of a patch file along with the binaries,
 *   2. add special version identification to distinguish your version
 *    in addition to the base release version number,
 *   3. provide your name and address as the primary contact for the
 *    support of your modified version, and
 *   4. retain our contact information in regard to use of the base
 *    software.
 * Permission to distribute the released version of the source code along
 * with corresponding source modifications in the form of a patch file is
 * granted with same provisions 2 through 4 for binary distributions.
 *
 * This software is provided "as is" without express or implied warranty
 * to the extent permitted by applicable law.
]*/

#ifndef GNUPLOT_CONTOUR_H
# define GNUPLOT_CONTOUR_H

/* #if... / #include / #define collection: */

#include "syscfg.h"
#include "gp_types.h"

#include "dynarray.h"
#include "graph3d.h"

#define DEFAULT_CONTOUR_LEVELS 5
#define DEFAULT_NUM_APPROX_PTS 5
#define DEFAULT_CONTOUR_ORDER  4
#define MAX_BSPLINE_ORDER      10

/* Type definitions */

typedef enum en_contour_kind {
    /* Method of drawing the contour lines found */
    CONTOUR_KIND_LINEAR,
    CONTOUR_KIND_CUBIC_SPL,
    CONTOUR_KIND_BSPLINE
} t_contour_kind;

typedef enum en_contour_levels_kind {
    /* How contour levels are set */
    LEVELS_AUTO,		/* automatically selected */
    LEVELS_INCREMENTAL,		/* user specified start & incremnet */
    LEVELS_DISCRETE		/* user specified discrete levels */
} t_contour_levels_kind;


/* Used to allocate the tri-diag matrix. */
typedef double tri_diag[3];

/* Variables of contour.c needed by other modules: */

extern char contour_format[32];
extern t_contour_kind contour_kind;
extern t_contour_levels_kind contour_levels_kind;
extern int contour_levels;
extern int contour_order;
extern int contour_pts;

/* storage for z levels to draw contours at */
extern dynarray dyn_contour_levels_list;
#define contour_levels_list ((double *)dyn_contour_levels_list.v)

/* Prototypes of functions exported by contour.c */

struct gnuplot_contours *contour __PROTO((int num_isolines, struct iso_curve *iso_lines));
int solve_tri_diag __PROTO((tri_diag m[], double r[], double x[], int n));


#endif /* GNUPLOT_CONTOUR_H */