Vec2d.hh

#pragma once

/*
	@author: Xinqi Bao
	2-D vector, with 2 double vaule points.
*/

#include <iostream>
#include "Vec3d.hh"

class Vec2d {
public:
	double x, y;
  bool equal(const Vec2d& v) const;
  bool equal(const Vec2d* v) const;
  double sum() const;

	Vec2d() {}
	Vec2d(double x, double y) : x(x), y(y) {}
	Vec2d( const Vec3d& v1, const Vec3d& v2, double z) {
		x = (v1.x - v2.x) * (z - v1.z) / (v1.z - v2.z) + v1.x;
		y = (v1.y - v2.y) * (z - v1.z) / (v1.z - v2.z) + v1.y;
	}

	friend std::istream& operator >>(std::istream& s, Vec2d& v) {
		return s >> v.x >> v.y;
	}
  friend std::istream& operator >>(std::istream& s, Vec2d* v) {
		return s >> v->x >> v->y;
	}
	friend std::ostream& operator <<(std::ostream& s, const Vec2d& v) {
		return s << v.x << "," << v.y;
	}
	friend std::ostream& operator <<(std::ostream& s, const Vec2d* v) {
		return s << v->x << "," << v->y;
	}
};