92 lines
2.4 KiB
C++
Executable file
92 lines
2.4 KiB
C++
Executable file
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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// "graph.cpp"
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// (c) OPAC Team, LIFL, 2003
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/* This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Contact: cahon@lifl.fr
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*/
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#include <fstream>
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#include <iostream>
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#include <math.h>
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#include "graph.h"
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namespace Graph {
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static std :: vector <std :: pair <double, double> > vectCoord ; // Coordinates
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static std :: vector <std :: vector <unsigned> > dist ; // Distances Mat.
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unsigned size () {
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return dist.size () ;
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}
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void computeDistances () {
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// Dim.
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unsigned numCities = vectCoord.size () ;
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dist.resize (numCities) ;
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for (unsigned i = 0 ; i < dist.size () ; i ++)
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dist [i].resize (numCities) ;
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// Computations.
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for (unsigned i = 0 ; i < dist.size () ; i ++)
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for (unsigned j = i + 1 ; j < dist.size () ; j ++) {
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double distX = vectCoord [i].first - vectCoord [j].first ;
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double distY = vectCoord [i].second - vectCoord [j].second ;
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dist [i] [j] = dist [j] [i] = (unsigned) (sqrt ((float) (distX * distX + distY * distY)) + 0.5) ;
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}
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}
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void load (const char * __fileName) {
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std :: ifstream f (__fileName) ;
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std :: cout << ">> Loading [" << __fileName << "]" << std :: endl ;
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if (f) {
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unsigned num_vert ;
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f >> num_vert ;
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vectCoord.resize (num_vert) ;
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for (unsigned i = 0 ; i < num_vert ; i ++)
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f >> vectCoord [i].first >> vectCoord [i].second ;
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f.close () ;
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computeDistances () ;
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}
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else {
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std :: cout << __fileName << " doesn't exist !!!" << std :: endl ;
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// Bye !!!
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exit (1) ;
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}
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}
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float distance (unsigned __from, unsigned __to) {
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return dist [__from] [__to] ;
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}
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}
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