/*

 * Copyright 2011 Steven Gribble

 *

 *  This file is the solution to an exercise problem posed during

 *  one of the UW CSE 333 lectures (333exercises).

 *

 *  333exercises 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 3 of the License, or

 *  (at your option) any later version.

 *

 *  333exercises 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 333exercises.  If not, see <http://www.gnu.org/licenses/>.

 */



// lec 11 exercise 1



#include "ThreeDPoint.h"



using namespace std;





// CopyFrom.

ThreeDPoint &ThreeDPoint::CopyFrom(const ThreeDPoint &py) {

  x_ = py.x_;

  y_ = py.y_;

  z_ = py.z_;

  return *this;

}



// Inner product.

double ThreeDPoint::InnerProduct(const ThreeDPoint &pt) const {

  double retval = 0.0;



  retval += (x_ * pt.x_);

  retval += (y_ * pt.y_);

  retval += (z_ * pt.z_);

  return retval;

}



// Arithmetic operators.

ThreeDPoint ThreeDPoint::operator+(const ThreeDPoint &pt) const {

  ThreeDPoint retval;



  retval.x_ = x_ + pt.x_;

  retval.y_ = y_ + pt.y_;

  retval.z_ = z_ + pt.z_;

  return retval;

}



ThreeDPoint ThreeDPoint::operator-(const ThreeDPoint &pt) const {

  ThreeDPoint retval;



  retval.x_ = x_ - pt.x_;

  retval.y_ = y_ - pt.y_;

  retval.z_ = z_ - pt.z_;

  return retval;

}



// Arithmetic + assign operators.

ThreeDPoint &ThreeDPoint::operator+=(const ThreeDPoint &pt) {

  x_ += pt.x_;

  y_ += pt.y_;

  z_ += pt.z_;

  return *this;

}



ThreeDPoint &ThreeDPoint::operator-=(const ThreeDPoint &pt) {

  x_ -= pt.x_;

  y_ -= pt.y_;

  z_ -= pt.z_;

  return *this;

}



// Override "<<" for std::ostream.  Note that this is not a member

// function of ThreeDPoint, but a global non-member function.  The

// "friend" is there so we can directly access pt's x_, y_, z_

// private variables.

ostream &operator<<(ostream &out, const ThreeDPoint &pt) {

  out << "(" << pt.x_ << "," << pt.y_ << "," << pt.z_ << ")";

  return out;

}