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