point.cpp

it is a usefull thing

//=====================================
// point.cpp
//=====================================
#include"point.h"
#include<cmath>
using namespace std;
//-------------------------------------
double Point::PI = 3.14159265;
//-------------------------------------
Point::Point(double a, double b): x(a), y(b){}
double Point::xOffset()const{ return x; }
double Point::yOffset()const{ return y; }
double Point::angle()const{ return (180/PI)*atan2(y, x); }
double Point::radius()const{ return sqrt(x*x + y*y); }
void Point::moveTo(double a, double b){ x = a, y = b; }
Point Point::operator+(const Point& d)const{return Point(x+d.x, y+d.y);}
Point& Point::operator+=(const Point& d){
  x+=d.x; y+=d.y;
  return *this;
}//------------------------------------