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Point.cc
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Point.cc
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#include "Point.hh"
#include <cmath>
using namespace std;
/* Returns the square of a number. It is marked static to be private in this module. */
static double sqr (double x) {
return x*x;
}
/** Constructor. */
Point::Point(double x_coord, double y_coord)
: x(x_coord),
y(y_coord)
{ }
/** Gets the x coordinate of this point. */
double Point::get_x () const {
return x;
}
/** Gets the y coordinate of this point. */
double Point::get_y () const {
return y;
}
/** Returns the distance to point p from this point. */
double Point::distance (const Point& p) const {
return sqrt(sqr(x - p.x) + sqr(y - p.y));
}
/** Returns the radius of this point (distance from the origin). */
double Point::radius () const {
return sqrt(x*x + y*y);
}
/** Returns the angle of the polar coordinate. */
double Point::angle () const {
if (x == 0 and y == 0) return 0;
else return atan(x/y);
}
/** Compares this point to point p. */
bool Point::operator== (const Point& p) const {
return x == p.x and y == p.y;
}
/** Compares this point to point p. */
bool Point::operator!= (const Point& p) const {
return not operator==(p);
}
/** Returns the angle of the polar coordinate of this point. */
Point& Point::operator+= (const Point& p) {
x += p.x;
y += p.y;
return *this;
}
/** Returns the point resulting of adding the coordinates of this point and p. */
Point Point::operator+ (const Point& p) const {
Point q = p;
q += *this;
return q;
// Equivalent one-liner: return Point(p) += *this;
}