1 /**************************************************************************
2 * mesh.h -- data structures and routines for processing terrain meshes
4 * Written by Curtis Olson, started May 1997.
6 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * (Log is kept at end of this file)
24 **************************************************************************/
32 /* start coordinates (in arc seconds) */
33 double originx, originy;
35 /* number of rows and columns */
38 /* Distance between row and column data points (in arc seconds) */
39 double row_step, col_step;
41 /* pointer to the actual mesh data dynamically allocated */
44 /* a temporary values for the parser to use */
51 /* return a pointer to a new mesh structure (no data array allocated yet) */
52 struct mesh *(new_mesh)();
54 /* initialize the non-array mesh values */
55 void mesh_init(struct mesh *m);
57 /* return a pointer to a dynamically allocated array */
58 float *(new_mesh_data)(int nrows, int ncols);
60 /* set the option name in the mesh data structure */
61 void mesh_set_option_name(struct mesh *m, char *name);
63 /* set an option value in the mesh data structure */
64 void mesh_set_option_value(struct mesh *m, char *value);
66 /* do whatever needs to be done with the mesh now that it's been
67 * loaded, such as generating the OpenGL call list. */
68 void mesh_do_it(struct mesh *m);
70 /* return the current altitude based on mesh data. We should rewrite
71 * this to interpolate exact values, but for now this is good enough */
72 double mesh_altitude(double lon, double lat);
79 /* Revision 1.4 1997/07/08 18:20:14 curt
80 /* Working on establishing a hard ground.
82 * Revision 1.3 1997/06/22 21:44:41 curt
83 * Working on intergrating the VRML (subset) parser.
85 * Revision 1.2 1997/05/23 15:40:42 curt
86 * Added GNU copyright headers.
88 * Revision 1.1 1997/05/16 16:07:05 curt