src/analog/functions.cpp

/***************************************************************************
 *   Copyright (C) 2006-2008 by Tomasz Ziobrowski                          *
 *   http://www.3electrons.com                                             *
 *   e-mail: t.ziobrowski@3electrons.com                                   *
 *                                                                         *
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 *   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.                          *
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 *   Free Software Foundation, Inc.,                                       *
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 ***************************************************************************/

#include "functions.h"

#include <iostream>
using namespace std; 

double minimalStep(double scaleSize, int steps)
{
  scaleSize = std::abs(scaleSize); 
  double ms = scaleSize/steps; 
  double fractions[]={5,2,1}; 
  double multiply = 10; 
  double fraction = 1.0; 
  double test; 
  if (static_cast<int>(ms)<=5) multiply = 0.1 ; 

  while (true)
  {
     for (int i=0;i<3;i++)
     {
      //cout<<"Fractions:"<<fractions[i]<<" scaleSize:"<<scaleSize<<" steps:"<<steps<<" steps*farction:"<<steps*fractions[i]<<endl; 
       if (fractions[i]<ms)
          { 
           fraction =fractions[i]; 
          }
       
         fractions[i]*=multiply; 
         test = steps * fractions[i]; 
         if ( (test < scaleSize) && multiply< 1.0 ) return fraction; 
         if ( (test > scaleSize) && multiply> 1.0 ) return fraction; 
     }  
  }
 
  return fraction; 
}