2 * $Id: contour.h,v 1.9 2004/08/09 00:51:29 sfeam Exp $
5 /* GNUPLOT - contour.h */
8 * Copyright 1999, 2004 Thomas Williams, Colin Kelley
10 * Permission to use, copy, and distribute this software and its
11 * documentation for any purpose with or without fee is hereby granted,
12 * provided that the above copyright notice appear in all copies and
13 * that both that copyright notice and this permission notice appear
14 * in supporting documentation.
16 * Permission to modify the software is granted, but not the right to
17 * distribute the complete modified source code. Modifications are to
18 * be distributed as patches to the released version. Permission to
19 * distribute binaries produced by compiling modified sources is granted,
21 * 1. distribute the corresponding source modifications from the
22 * released version in the form of a patch file along with the binaries,
23 * 2. add special version identification to distinguish your version
24 * in addition to the base release version number,
25 * 3. provide your name and address as the primary contact for the
26 * support of your modified version, and
27 * 4. retain our contact information in regard to use of the base
29 * Permission to distribute the released version of the source code along
30 * with corresponding source modifications in the form of a patch file is
31 * granted with same provisions 2 through 4 for binary distributions.
33 * This software is provided "as is" without express or implied warranty
34 * to the extent permitted by applicable law.
37 #ifndef GNUPLOT_CONTOUR_H
38 # define GNUPLOT_CONTOUR_H
40 /* #if... / #include / #define collection: */
48 #define DEFAULT_CONTOUR_LEVELS 5
49 #define DEFAULT_NUM_APPROX_PTS 5
50 #define DEFAULT_CONTOUR_ORDER 4
51 #define MAX_BSPLINE_ORDER 10
53 /* Type definitions */
55 typedef enum en_contour_kind {
56 /* Method of drawing the contour lines found */
58 CONTOUR_KIND_CUBIC_SPL,
62 typedef enum en_contour_levels_kind {
63 /* How contour levels are set */
64 LEVELS_AUTO, /* automatically selected */
65 LEVELS_INCREMENTAL, /* user specified start & incremnet */
66 LEVELS_DISCRETE /* user specified discrete levels */
67 } t_contour_levels_kind;
70 /* Used to allocate the tri-diag matrix. */
71 typedef double tri_diag[3];
73 /* Variables of contour.c needed by other modules: */
75 extern char contour_format[32];
76 extern t_contour_kind contour_kind;
77 extern t_contour_levels_kind contour_levels_kind;
78 extern int contour_levels;
79 extern int contour_order;
80 extern int contour_pts;
82 /* storage for z levels to draw contours at */
83 extern dynarray dyn_contour_levels_list;
84 #define contour_levels_list ((double *)dyn_contour_levels_list.v)
86 /* Prototypes of functions exported by contour.c */
88 struct gnuplot_contours *contour __PROTO((int num_isolines, struct iso_curve *iso_lines));
89 int solve_tri_diag __PROTO((tri_diag m[], double r[], double x[], int n));
92 #endif /* GNUPLOT_CONTOUR_H */