Polar.cxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * 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
 *
 */


#include "Polar.hxx"
#include <iostream>
#include <sstream>

namespace CLAM
{
        // complex '+=' operator
        const Polar& Polar::operator += (const Polar& a)
        {
                TData r1 = fabs(a.mMag) * CLAM_cos(a.mAng); 
                TData i1 = fabs(a.mMag) * CLAM_sin(a.mAng); 
                TData r2 = fabs(mMag) * CLAM_cos(mAng);
                TData i2 = fabs(mMag) * CLAM_sin(mAng);
                
                TData r3 = r1+r2;
                TData i3 = i1+i2;
                
                mMag = sqrt (r3*r3 + i3*i3);
                mAng = atan2 (i3,r3); 
        
                return *this;
        }

        //  complex '-=' operator 
        const Polar& Polar::operator -= (const Polar& a)
        {
                TData r1 = fabs(a.mMag) * CLAM_cos(a.mAng); 
                TData i1 = fabs(a.mMag) * CLAM_sin(a.mAng); 
                TData r2 = fabs(mMag) * CLAM_cos(mAng);
                TData i2 = fabs(mMag) * CLAM_sin(mAng);
                
                TData r3 = r2-r1;
                TData i3 = i2-i1;
                
                mMag = CLAM_sqrt (r3*r3 + i3*i3);
                mAng = CLAM_atan2 (i3,r3); 
        
                return *this;
        }

        // polar '+' operator 
        Polar Polar::operator + (const Polar& b) const
        {
                TData r1 = fabs(mMag) * CLAM_cos(mAng); 
                TData i1 = fabs(mMag) * CLAM_sin(mAng); 
                TData r2 = fabs(b.mMag) * CLAM_cos(b.mAng);
                TData i2 = fabs(b.mMag) * CLAM_sin(b.mAng);
                
                TData r3 = r1+r2;
                TData i3 = i1+i2;
                
                Polar ret(CLAM_sqrt (r3*r3 + i3*i3),CLAM_atan2 (i3,r3)); 
                return ret;
        }

         //  polar '-' operator 
        Polar Polar::operator - (const Polar& b) const
        {
                TData r1 = fabs(mMag) * CLAM_cos(mAng); 
                TData i1 = fabs(mMag) * CLAM_sin(mAng); 
                TData r2 = fabs(b.mMag) * CLAM_cos(b.mAng);
                TData i2 = fabs(b.mMag) * CLAM_sin(b.mAng);
                
                TData r3 = r1-r2;
                TData i3 = i1-i2;
                
                Polar ret(CLAM_sqrt (r3*r3 + i3*i3),CLAM_atan2 (i3,r3)); 
                return ret;
        }

        std::istream& operator >> (std::istream & is,
                        Polar & a)
        {
                if (is.flags() & std::ios::skipws) {
                        char c = '\0';
                        do
                                is.get(c);
                        while (is && isspace(c));
                        if (is) is.putback(c);
                }
                char c = '\0';
                is >> c;
                if (c!='{') {
                        if (is) is.putback(c);
//                      std::cerr << "A polar starting with '" << c << "'" << std::endl;
                        return is;
                }
                TData m;
                TData p; 
                if (!(is >> m)) return is;
                if (!(is >> p)) return is;
                if (is.flags() & std::ios::skipws) {
                        char c = '\0';
                        do
                                is.get(c);
                        while (is && isspace(c));
                        if (is) is.putback(c);
                }
                if (!is.get(c) || c!='}') return is;

                a.SetMag(m);
                a.SetAng(p);
                return is;
        }

        std::ostream& operator << (std::ostream& myStream, const Polar& a)
        {
                return myStream 
                        << "{"
                        << a.Mag()
                        << " "
                        << a.Ang()
                        << "}";
        }

} // namespace CLAM