Vector2.h

// Copyright 2021 SMS
// License(Apache-2.0)

#pragma once

#include <cfloat>
#include <cmath>

#include "Vector2i.h"

class Vector2
{
public:
    float x = 0.0f;
    float y = 0.0f;

    Vector2() = default;

    Vector2(float x, float y);

    float size() const;

    float sizeSquared() const;

    float distance(const Vector2& point) const;

    float distanceSquared(const Vector2& point) const;

    Vector2& normalize();

    float dot(const Vector2& v) const;

    float angle() const;

    void rotate(const Vector2& point, float angle);

    Vector2 getMidPoint(const Vector2& p) const;

    float area() const;

    float& operator[](size_t index);

    bool     operator==(const Vector2& v) const;
    bool     operator!=(const Vector2& v) const;
    Vector2  operator*(float n) const;
    Vector2  operator/(float n) const;
    Vector2  operator+(const Vector2& v) const;
    Vector2  operator-(const Vector2& v) const;
    Vector2  operator-() const;
    Vector2& operator+=(const Vector2& v);
    Vector2& operator-=(const Vector2& v);
    Vector2& operator*=(float n);
    Vector2& operator/=(float n);

    Vector2 operator+(const Vector2i& v) const;
    Vector2 operator-(const Vector2i& v) const;

    Vector2i asInt() const;

    operator Vector2i() const;

    static const Vector2 unit; // (1, 1)
    static const Vector2 zero; // (0, 0)

    static const Vector2 up;    // (0, 1)
    static const Vector2 down;  // (0, -1)
    static const Vector2 right; // (1, 0)
    static const Vector2 left;  // (-1, 0)
};

using Point2 = Vector2;
using Size2  = Vector2;
using Vec2   = Vector2;