src/tool/random.cpp

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/******************************************************************************
 *  Wormux is a convivial mass murder game.
 *  Copyright (C) 2001-2004 Lawrence Azzoug.
 *
 *  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 ******************************************************************************
 * Functions to generate random datas (number, boolean, etc.).
 *****************************************************************************/

#include <time.h>
#include <math.h>
#include <stdlib.h>
#include <assert.h>
#include "random.h"

Random randomObj;

Random::Random(){
  srand( time(NULL) );
}

bool Random::GetBool(){
  int moitie = RAND_MAX/2;
  return (rand() <= moitie);
}

long Random::GetLong(long min, long max){
        return min + (long)GetDouble(max - min + 1);
/*  double r = rand();
  
  r *= (max - min);
  r /= RAND_MAX;
  if( r >= 0 )
          r = floor(r + 0.5);
  else
          r = ceil(r - 0.5);
  
  return min + (long)r; */
}

double Random::GetDouble(double min, double max){
        return min + GetDouble(max - min);
}

double Random::GetDouble(double max){
        return max * GetDouble();
}

double Random::GetDouble(){
        return 1.0*rand()/(RAND_MAX + 1.0);
}

Point2i Random::GetPoint(const Rectanglei &rect){
        Point2i topPoint = rect.GetPosition();
        Point2i bottomPoint = rect.GetBottomRightPoint();
        
        return Point2i( GetLong(topPoint.x, bottomPoint.x), 
                        GetLong(topPoint.y, bottomPoint.y) );
}

Point2i Random::GetPoint(const Point2i &pt){
        return Point2i( GetLong(0, pt.x - 1), GetLong(0, pt.y - 1) );
}

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