#ifndef Pixel_h
#define Pixel_h

#include <functional>
#include <iostream>

class Pixel {
  public:
    Pixel(int x = 0, int y = 0) : x(x), y(y) {}

    void print() const { std::cout << '(' << x << "," << y << ") "; }

    bool operator<(const Pixel &rhs) const { return x < rhs.x; }

    bool operator==(const Pixel &rhs) const { return x == rhs.x; }

  private:
    int x;
    int y;

    friend class PixelPtrCompare;
};

class PixelPtrCompare {
  public:
    PixelPtrCompare() : sortOnY(false) {}

    void setSortOnY(bool sortY) { this->sortOnY = sortY; }

    bool operator()(const Pixel *l, const Pixel *r) const {
        if (sortOnY)
            return l->y < r->y;
        else
            return l->x < r->x;
    }

  private:
    bool sortOnY;
};

#endif