// This may look like C code, but it is really -*- C++ -*-

// Point3Df.h

// (C) 2002 Bill Lenhart


#ifndef POINT3DF_H
#define POINT3DF_H

#include <iostream>

////////////////////
// class Point3Df //
////////////////////

class Point3Df {

public:

  // Default constructor: Initializes point to (0,0,0)
  Point3Df();

  // Initializes point to (x,y,z)
  Point3Df(float xval, float yval, float zval);

  // Copy Constructor
  Point3Df(const Point3Df& other);

  // Copies other to this
  Point3Df& operator=(const Point3Df& other);

  // Destructor: Does nothing
  ~Point3Df();

  // coordinates of point
  float x;
  float y;
  float z;

  // coordinate-wise addition/subtraction/multiplication of self with other
  // modifies (and returns) self
  Point3Df& operator+=(const Point3Df& other);
  Point3Df& operator-=(const Point3Df& other);
  Point3Df& operator*=(const Point3Df& other);
  
  // add, subtract, multiply, every element by scalar
  // modifies (and returns) self
  Point3Df& operator+=(const float scalar);
  Point3Df& operator-=(const float scalar);
  Point3Df& operator*=(const float scalar);
  
  // Point3Df component-wise addition, subtraction and multiplication
  Point3Df operator+(const Point3Df& other) const;
  Point3Df operator-(const Point3Df& other) const;
  Point3Df operator*(const Point3Df& other) const;
  
  // dot product
  float dot(const Point3Df& other) const;
  
  // magnitude of vector
  float Point3Df::norm(void) const;

  // scale point to unit length
  Point3Df& Point3Df::normalize(void);

  // operators for addition, subtraction, multiplication by scalar
  // Note: always put point on the left
  Point3Df operator*(const float x) const;
  Point3Df operator+(const float x) const;
  Point3Df operator-(const float x) const;
  
  // read point from stream
  istream& in(istream& is);
  
  // append point to end of stream
  ostream& out(ostream&) const;
};

// friends
// read a point:  a binary operator
istream& operator>>(istream& is, Point3Df& p);

// print a point: a binary operator
ostream& operator<<(ostream& o, const Point3Df& p);

#endif POINT3DF_H