1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
/* -*- mode: C -*- */
/*
IGraph library.
Copyright (C) 2006-2012 Gabor Csardi <csardi.gabor@gmail.com>
334 Harvard street, Cambridge, MA 02139 USA
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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include <igraph.h>
int main() {
igraph_real_t coords_array[][2] =
{{3, 2}, {5, 1}, {4, 4}, {6, 4}, {4, 3},
{2, 5}, {1, 3}, {2, 4}, {6, 3}, {9, 2}
};
igraph_matrix_t coords, resmat;
igraph_vector_t result;
long i;
igraph_matrix_init(&coords, 10, 2);
for (i=0; i<20; i++) MATRIX(coords, i/2, i%2) = coords_array[i/2][i%2];
/* Testing with index output mode */
igraph_vector_init(&result, 1);
if (igraph_convex_hull(&coords, &result, 0))
return 1;
for (i=0; i<igraph_vector_size(&result); i++)
printf("%ld ", (long)VECTOR(result)[i]);
printf("\n");
igraph_vector_destroy(&result);
/* Testing with coordinate output mode */
igraph_matrix_init(&resmat, 0, 0);
if (igraph_convex_hull(&coords, 0, &resmat))
return 1;
for (i=0; i<igraph_matrix_nrow(&resmat); i++)
printf("%ld %ld ", (long)MATRIX(resmat, i, 0), (long)MATRIX(resmat, i, 1));
printf("\n");
igraph_matrix_destroy(&resmat);
igraph_matrix_destroy(&coords);
return 0;
}
|
