1 /**************************************************************************
2 * mesh.c -- 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 **************************************************************************/
29 #include <stdlib.h> /* atof(), atoi() */
36 /* return a pointer to a new mesh structure (no data array allocated yet) */
37 struct mesh *(new_mesh)() {
38 struct mesh *mesh_ptr;
40 mesh_ptr = (struct mesh *)malloc(sizeof(struct mesh));
42 if ( mesh_ptr == 0 ) {
43 printf("Virtual memory exceeded\n");
47 mesh_ptr->cur_row = 0;
48 mesh_ptr->cur_col = 0;
54 /* return a pointer to a dynamically allocated array */
55 float *(new_mesh_data)(int nrows, int ncols) {
58 mesh_data_ptr = (float *)malloc(nrows * ncols * sizeof(float));
60 if ( mesh_data_ptr == 0 ) {
61 printf("Virtual memory exceeded\n");
65 printf("Allocated float(%d, %d)\n", nrows, ncols);
67 return(mesh_data_ptr);
71 /* set the option name in the mesh data structure */
72 void mesh_set_option_name(struct mesh *m, char *name) {
73 if ( strlen(name) < MAX_IDENT_LEN ) {
74 strcpy(m->option_name, name);
76 strncpy(m->option_name, name, MAX_IDENT_LEN - 1);
77 m->option_name[MAX_IDENT_LEN - 1] = '\0';
81 /* set an option value in the mesh data structure */
82 void mesh_set_option_value(struct mesh *m, char *value) {
83 printf("Setting %s to %s\n", m->option_name, value);
85 if ( strcmp(m->option_name, "origin_lat") == 0 ) {
86 m->originx = atof(value);
87 } else if ( strcmp(m->option_name, "origin_lon") == 0 ) {
88 m->originy = atof(value);
89 } else if ( strcmp(m->option_name, "rows") == 0 ) {
90 m->rows = atoi(value);
91 } else if ( strcmp(m->option_name, "cols") == 0 ) {
92 m->cols = atoi(value);
93 } else if ( strcmp(m->option_name, "row_step") == 0 ) {
94 m->row_step = atof(value);
95 } else if ( strcmp(m->option_name, "col_step") == 0 ) {
96 m->col_step = atof(value);
98 printf("Unknown option %s with value %s, ignoring ...\n",
99 m->option_name, value);
105 /* Revision 1.3 1997/05/23 15:40:41 curt
106 /* Added GNU copyright headers.
108 * Revision 1.2 1997/05/19 18:20:50 curt
109 * Slight change to origin key words.
111 * Revision 1.1 1997/05/16 16:07:04 curt