1 | /*************************************************************************** |
---|
2 | * Copyright (C) 2008 by Daniel Wendt * |
---|
3 | * gentoo.murray@gmail.com * |
---|
4 | * * |
---|
5 | * This program is free software; you can redistribute it and/or modify * |
---|
6 | * it under the terms of the GNU General Public License as published by * |
---|
7 | * the Free Software Foundation; either version 2 of the License, or * |
---|
8 | * (at your option) any later version. * |
---|
9 | * * |
---|
10 | * This program is distributed in the hope that it will be useful, * |
---|
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
---|
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
---|
13 | * GNU General Public License for more details. * |
---|
14 | * * |
---|
15 | * You should have received a copy of the GNU General Public License * |
---|
16 | * along with this program; if not, write to the * |
---|
17 | * Free Software Foundation, Inc., * |
---|
18 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
---|
19 | ***************************************************************************/ |
---|
20 | |
---|
21 | #include "stdafx.h" |
---|
22 | #include "math_functions.h" |
---|
23 | #include <math.h> |
---|
24 | |
---|
25 | // calculation of the lenght is correct??? |
---|
26 | double getLength(Node* a, Node* b) |
---|
27 | { |
---|
28 | int R = 6371; //km |
---|
29 | double PI =3.141592653589793238462643; |
---|
30 | |
---|
31 | double dLat=(b->lat -a->lat)*PI/180; |
---|
32 | double dLon=(b->lon -a->lon)*PI/180; |
---|
33 | |
---|
34 | double c = sin(dLat/2) * sin(dLat/2) + cos(a->lat*PI/180) * cos(b->lat*PI/180) * sin(dLon/2) * sin(dLon/2); |
---|
35 | |
---|
36 | double d = 2 * atan2(sqrt(c), sqrt(1-c)); |
---|
37 | |
---|
38 | return R*d; |
---|
39 | |
---|
40 | } |
---|
41 | |
---|